Friday, May 15, 2009

Vanilla v.1.1.7 Cross-Site Scripting

Author: Gerendi Sandor Attila
Date: May 14, 2009
Package: Vanilla (1.1.7)
Product Homepage: http://getvanilla.com/
Versions Affected: v.1.1.7, 1.1.5 (Other versions may also be affected)
Severity: Medium

Input passed to the 'RequestName' header parameter when posting to '/ajax/updatecheck.php' is not sanitized before it is returned to the user. This can be exploited to execute arbitrary HTML and script code in a user's browser session in context of an affected site.

Example:
http://somehost/ajax/updatecheck.php?PostBackKey=1&ExtensionKey=1&RequestName=1<script>alert(123)</script>
will return:
1<script>alert(123)</script>|[ERROR]There was a problem authenticating your post information.

Status:
1. Contacted the author at: May 15, 2009 via http://lussumo.com/
2. The author corrected the problem in the same day (read here).

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