Community Server - Stored Cross-site Scripting in user's signature.
Product description: Community Server is a communities and collaboration web application developed by Telligent. It uses ASP.NET platform (C#) and Microsoft SQL Server database. From it's 5.0 version, the software was renamed to Telligent Community.
Vulnerability Details: It is possible to insert scripts (Cross-site Scripting) in user's signature, using BBCode Tag's processing errors.
Proof of Concept: Set an user's signature to:
[img]invalid.jpg[url= onerror=alert(1) z=] a[/url][/img]
An alert will be show in every topic the user posts in and also in its profile.
Affected Versions: Community Server 2007 (may affect others)
Unaffected Versions: Telligent Community 5.x or earlier
Timeline: [05/25/10] Vulnerability details sent to address for security related contacts present at company's website, although the address did not exist. [05/26/10] Ticket opened asking for contact to send off vulnerability details. [05/26/10] Ticket's answer received, containing e-mail for the sending of vulnerability details. [05/26/10]Vulnerability details sent. [05/26/10] Answer received informing that vulnerability did not exist on latest versions of the product. [07/15/11] Advisory published.
Credits: PontoSec - Seguranca da Informacao < http://www.pontosec.com > - Researcher: Gabriel Lima (gabriel <at> pontosec.com)