[buuctf]cat flag题解
[BUUCTF] cat flag 题解
1. 题目源码
题目给出的 PHP 源代码如下:
<?phpif (isset($_GET[cmd])) {$cmd $_GET[cmd];if (!preg_match(/flag/i, $cmd)){$cmd escapeshellarg($cmd);system(cat . $cmd);}
} else {highlight_file(__FILE__);
}
?>逻辑分析&a…
2026/8/13 8:36:08