ExpressionEngine Persistent Cross-Site Scripting Mar 22 2009 11:28PM
Adam Baldwin (adam_baldwin ngenuity-is com)
nGenuity Information Services - Security Advisory

Advisory ID: NGENUITY-2009-003 - ExpressionEngine Persistent Cross-Site Scripting
Application: ExpressionEngine (1.6.4 (possibly earlier)-1.6.6)
Vendor: EllisLab, INC
Vendor website: http://www.expressionengine.com <http://www.transparent-tech.com/>
Author: Adam Baldwin (adam_baldwin (at) ngenuity-is (dot) com [email concealed])

I. BACKGROUND
"ExpressionEngine is a flexible, feature-rich content management system
that empowers thousands of individuals, organizations, and companies
around the world to easily manage their website." [1]

II. DETAILS
While setting a display avatar in the user control panel, avatar names
are not validated for invalid input. User input is then rendered, unaltered
into any browser that displays that members avatar.

Here is an example of an avatar name that will display an alert to any visitor
that views the users profile.

chococat.gif"><script>alert('XSS')</script><div "a

III. REFERENCES
[1] - http://expressionengine.com/

IV. VENDOR COMMUNICATION
1.17.2009 - Vendor Notified
1.18.2009 - Initial vendor communication (details requested)
1.18.2009 - Steps to reproduce provided to vendor
1.21.2009 - Vendor response with public update "shortly"
1.22.2009 - Vendor releases 1.6.7 which addresses this vulnerability

Copyright (c) 2008 nGenuity Information Services, LLC

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