full-disclosure - [FD] Vanilla forum Stored XSS on any private message / thread post

Open Source and information security mailing list archives

Date: Thu, 12 Feb 2015 10:37:22 +0300
From: W S <w@...ox.ru>
To: fulldisclosure@...lists.org
Subject: [FD] Vanilla forum Stored XSS on any private message / thread post

 The vulnerability is related to the insufficient filtration in HTMLawed. Existing filter can be bypassed and paste into the HTML tag <img> onerror event, that leads to stored XSS.

I notified the developers of existing vulnerabilities and they closed it in version 2.1.1

proof:
http://vanillaforums.org/discussion/27540/vanilla-2-1-1-important-security-bug-release

vulnerable versions:
2.0 to 2.1.1 
maybe 1.* versions

my XSS exploit:
<img alt="<img onerror=alert(1)//"<"> 

Screenshot with alert in attach of this message.
Download attachment "vanilla xss.png" of type "image/png" (36074 bytes)

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