phpGraphy 0.9.13b XSS

在exploit-db.com上看到,小看了下

Vulnerability ID: HTB22958

Reference: http://www.htbridge.ch/advisory/xss_in_phpgraphy.html

Product: phpGraphy

Vendor: http://phpgraphy.sourceforge.net/ ( http://phpgraphy.sourceforge.net/ )

Vulnerable Version: 0.9.13b

Vendor Notification: 14 April 2011

Vulnerability Type: XSS (Cross Site Scripting)

Risk level: Medium

Credit: High-Tech Bridge SA Security Research Lab ( http://www.htbridge.ch/advisory/ )

Vulnerability Details:

User can execute arbitrary JavaScript code within the vulnerable application.

The vulnerability exists due to failure in the "/themes/default/header.inc.php" script to properly sanitize user-supplied input in "theme_dir" variable then register_globals on.

Successful exploitation of this vulnerability could result in a compromise of the application, theft of cookie-based authentication credentials, disclosure or modification of sensitive data.

The following PoC is available:

http://[host]/themes/default/header.inc.php?theme_dir=%22%3E%3Cscript%3Ealert%28document.cookie%29;%3C/script%3E

先測試下代碼,是否真實存在

 

可以alert,存在!

php.ini的設置爲register_globals = on

那麼分析下代碼看下

打開 themes/default/header.inc.php,看到21行開始

<link rel="stylesheet" href="&lt;?php echo $theme_dir ?>phpgraphy.css" type="text/css" /&gt;
<link rel="icon" href="&lt;?php echo $base_images_dir ?>favico.ico" type="image/ico" /&gt;
<link rel="shortcut icon" href="&lt;?php echo $base_images_dir ?>favico.ico" type="image/ico" /&gt;

沒有初始化造成的

解決方案1.php.ini的設置爲register_globals = off
       2.初始化$base_images_dir  和$theme_dir 還有themes/default/header.inc.php中其他的.