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TITLE:
Feed Sidebar Firefox Extension Code Execution Vulnerability

SECUNIA ADVISORY ID:
SA36426

VERIFY ADVISORY:
http://secunia.com/advisories/36426/

DESCRIPTION:
A vulnerability has been discovered in the Feed Sidebar extension for
Firefox, which can be exploited by malicious people to compromise a
user's system.

Input passed via RSS feeds is not properly sanitised before being
used. This can be exploited to e.g. execute arbitrary script code
within the "chrome:" context and execute arbitrary commands on a
user's system.

Successful exploitation requires that a user subscribes to a
specially crafted RSS feed.

The vulnerability is confirmed in version 3.1.6. Other versions may
also be affected.

SOLUTION:
Fixed in version 3.2pre2 and later.

PROVIDED AND/OR DISCOVERED BY:
Nick Freeman, Security-Assessment.com

ORIGINAL ADVISORY:
Feed Sidebar:
http://www.chrisfinke.com/2009/03/14/feed-sidebar-32-beta-update/

Security-Assessment.com:
http://security-assessment.com/files/advisories/Feed_Sidebar_Firefox_Extension_Privileged_Code_Injection.pdf

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