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TITLE:
Mozilla Firefox 3 URI Launching and XUL Error Page Vulnerabilities

SECUNIA ADVISORY ID:
SA31106

VERIFY ADVISORY:
http://secunia.com/advisories/31106/

CRITICAL:
Highly critical

IMPACT:
Security Bypass, Spoofing, System access

WHERE:
>From remote

SOFTWARE:
Mozilla Firefox 3.x
http://secunia.com/product/19089/

DESCRIPTION:
Some vulnerabilities have been reported in Firefox 3, which can be
exploited by malicious people to bypass certain security
restrictions, potentially conduct spoofing attacks, or compromise a
user's system.

1) A vulnerability can be exploited to launch e.g. "file" or
"chrome:" URIs in Firefox.

For more information see:
SA31120

2) Input passed to XUL based error pages is not properly sanitised
before being returned to a user and can be exploited to e.g. conduct
spoofing attacks.

In combination with vulnerability #1 this can be exploited to inject
arbitrary script code and execute arbitrary code in "chrome" context,
but requires that a specially crafted URI is passed to Firefox and
that Firefox is not running.

The vulnerabilities are reported in versions prior to 3.0.1.

SOLUTION:
Update to version 3.0.1.
http://www.mozilla.com/en-US/firefox/

PROVIDED AND/OR DISCOVERED BY:
The vendor credits:
1) Billy Rios
2) Ben Turner and Dan Veditz (Mozilla developers)

ORIGINAL ADVISORY:
MFSA 2008-35:
http://www.mozilla.org/security/announce/2008/mfsa2008-35.html

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About:
This Advisory was delivered by Secunia as a free service to help
everybody keeping their systems up to date against the latest
vulnerabilities.

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Definitions: (Criticality, Where etc.)
http://secunia.com/about_secunia_advisories/


Please Note:
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Secunia NEVER sends attached files with advisories.
Secunia does not advise people to install third party patches, only
use those supplied by the vendor.

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