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

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