Microsoft SharePoint Server 2007 XSS Vulnerability

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Vulnerability ID: HTB22350

Reference:
http://www.htbridge.ch/advisory/xss_in_microsoft_sharepoint_server_2007.html

Product: Microsoft SharePoint Server 2007

Vendor: Microsoft Corporation

Vulnerable Version: 12.0.0.6421 and Probably Prior Versions Vendor
Notification: 12 April 2010 Vulnerability Type: XSS (?ross Site S?ri?ting)

Status: Not Fixed, Vendor Alerted, Awaiting Vendor Response Risk level:
Medium

Credit: High-Tech Bridge SA (http://www.htbridge.ch/)

Vulnerability Details:

User can execute arbitrary JavaScript code within the vulnerable
application.

The vulnerability exists due to failure in the "/_layouts/help.aspx" script
to properly sanitize user-supplied input in "cid0" variable. 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.

An attacker can use browser to exploit this vulnerability. The following PoC
is available:

http://host/_layouts/help.aspx?cid0=MS.WSS.manifest.xml%00%3Cscript%3Ealert%28%27XSS%27%29%3C/script%3E&tid=X