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Zero Day Initiative Advisory 11-159

Zero Day Initiative Advisory 11-159
Posted May 10, 2011
Authored by Tipping Point | Site zerodayinitiative.com

Zero Day Initiative Advisory 11-159 - This vulnerability allows remote attackers to execute arbitrary code on vulnerable installations of Mozilla 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 Firefox's handling of observer OBJECTs. If an observer OBJECT is removed from the mObserverList during an iteration of LOOP_OVER_OBSERVERS macro, one can heap spray over |mObserverList.mNext| and change the execution flow. This would allow the attacker to execute arbitrary code under the context of the user running the browser.

tags | advisory, remote, arbitrary
advisories | CVE-2011-0066
MD5 | 2f0bf843d1a91c47232dbbfb9a7d6c22

Zero Day Initiative Advisory 11-159

Change Mirror Download
ZDI-11-159: Mozilla Firefox OBJECT mObserverList Remote Code Execution Vulnerability

http://www.zerodayinitiative.com/advisories/ZDI-11-159

May 10, 2011

-- CVE ID:
CVE-2011-0066

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

-- 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 11198.
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 Mozilla 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 Firefox's handling of observer OBJECTs.
If an observer OBJECT is removed from the mObserverList during an
iteration of LOOP_OVER_OBSERVERS macro, one can heap spray over
|mObserverList.mNext| and
change the execution flow. This would allow the attacker to execute
arbitrary code under the context of the user running 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/mfsa2011-13.html

-- Disclosure Timeline:
2011-02-17 - Vulnerability reported to vendor
2011-05-10 - 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/

Follow the ZDI on Twitter:

http://twitter.com/thezdi

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