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ZDI-11-225: Mozilla Firefox nsXULCommandDispatcher Remote Code Execution Vulnerability
From: ZDI Disclosures <zdi-disclosures () tippingpoint com>
Date: Tue, 21 Jun 2011 16:28:38 +0000

ZDI-11-225: Mozilla Firefox nsXULCommandDispatcher Remote Code Execution Vulnerability

http://www.zerodayinitiative.com/advisories/ZDI-11-225

June 21, 2011

-- CVE ID:
CVE-2011-0085

-- CVSS:
7.5, (AV:N/AC:L/Au:N/C:P/I:P/A:P)

-- Affected Vendors:
Mozilla

-- Affected Products:
Mozilla Firefox

-- TippingPoint(TM) IPS Customer Protection:
TippingPoint IPS customers have been protected against this
vulnerability by Digital Vaccine protection filter ID 11404. 
For further product information on the TippingPoint IPS, visit:

    http://www.tippingpoint.com

-- Vulnerability Details:
This vulnerability allows remote attackers to execute arbitrary code on
vulnerable installations of Firefox. User interaction is required to
exploit this vulnerability in that the target must visit a malicious
page or open a malicious file.

The specific flaw exists within the nsXULCommandDispatcher.cpp source
code. During a NS_XUL_COMMAND_UPDATE event dispatch, the user is able to
force command dispatcher to remove all the updaters in the mUpdaters
chain including the one that is currently in use. As a result, the local
variable updater becomes a stale pointer and updater->mNext refers to
memory previously freed. Successful exploitation can lead to code
execution in the context of the browser.

-- Vendor Response:
Mozilla has issued an update to correct this vulnerability. More
details can be found at:

http://www.mozilla.org/security/announce/2011/mfsa2011-23.html

-- Disclosure Timeline:
2011-04-04 - Vulnerability reported to vendor
2011-06-21 - Coordinated public release of advisory

-- Credit:
This vulnerability was discovered by:
    * regenrecht

-- About the Zero Day Initiative (ZDI):
Established by TippingPoint, The Zero Day Initiative (ZDI) represents 
a best-of-breed model for rewarding security researchers for responsibly
disclosing discovered vulnerabilities.

Researchers interested in getting paid for their security research
through the ZDI can find more information and sign-up at:

    http://www.zerodayinitiative.com

The ZDI is unique in how the acquired vulnerability information is
used. TippingPoint does not re-sell the vulnerability details or any
exploit code. Instead, upon notifying the affected product vendor,
TippingPoint provides its customers with zero day protection through
its intrusion prevention technology. Explicit details regarding the
specifics of the vulnerability are not exposed to any parties until
an official vendor patch is publicly available. Furthermore, with the
altruistic aim of helping to secure a broader user base, TippingPoint
provides this vulnerability information confidentially to security
vendors (including competitors) who have a vulnerability protection or
mitigation product.

Our vulnerability disclosure policy is available online at:

    http://www.zerodayinitiative.com/advisories/disclosure_policy/

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