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Highly critical

Firefox "firefoxurl" URI Handler Registration Vulnerability

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Release Date:  2007-07-10    Last Update:  2007-07-20    Views:  76,208

Secunia Advisory SA25984

Where:

From remote

Impact:

System access

Solution Status:

Vendor Patch

CVE Reference(s):

Description


A vulnerability has been discovered in Firefox, which can be exploited by malicious people to compromise a user's system.

The problem is that Firefox registers the "firefoxurl://" URI handler and allows invoking firefox with arbitrary command line arguments. Using e.g. the "-chrome" parameter it is possible to execute arbitrary Javascript in chrome context. This can be exploited to execute arbitrary commands e.g. when a user visits a malicious web site using Microsoft Internet Explorer.

The vulnerability is confirmed in Firefox version 2.0.0.4 on a fully patched Windows XP SP2. Other versions may also be affected.


Solution:
Update to version 2.0.0.5.

Provided and/or discovered by:
Billy (BK) Rios, Nate Mcfeters, and Raghav "the Pope" Dube

Additional information provided by Thor Larholm.

Independently discovered by Greg MacManus, iDefense Labs.

Original Advisory:
Mozilla:
http://www.mozilla.org/security/announce/2007/mfsa2007-23.html

http://www.xs-sniper.com/sniperscope/IE-Pwns-Firefox.html

http://larholm.com/2007/07/10/internet-explorer-0day-exploit/

iDefense:
http://labs.idefense.com/intelligence/vulnerabilities/display.php?id=565

Deep Links:
Links available to Secunia VIM customers

Do you have additional information related to this advisory?

Please provide information about patches, mitigating factors, new versions, exploits, faulty patches, links, and other relevant data by posting comments to this Advisory. You can also send this information to vuln@secunia.com

Subject: Firefox "firefoxurl" URI Handler Registration Vulnerability

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