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Zero Day Initiative Advisory 12-110

Zero Day Initiative Advisory 12-110
Posted Jun 29, 2012
Authored by Tipping Point | Site zerodayinitiative.com

Zero Day Initiative Advisory 12-110 - 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 the way Firefox handles nsDOMAttribute child removal. It is possible to remove a child without setting the removed child pointer to NULL, thus leaving it still accessible as a dangling pointer. Subsequent use of this pointer allows for remote code execution.

tags | advisory, remote, arbitrary, code execution
advisories | CVE-2011-3659
SHA-256 | 75a17d05bb1ce9d85c18a44c0f62f0d23ba1f077eab5fccd0a2a8d01acd33897

Zero Day Initiative Advisory 12-110

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ZDI-12-110 : Mozilla Firefox AttributeChildRemoved Use-After-Free Remote
Code Execution Vulnerability
http://www.zerodayinitiative.com/advisories/ZDI-12-110
June 28, 2012

- -- CVE ID:
CVE-2011-3659

- -- 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 12418.
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 the way Firefox handles nsDOMAttribute
child removal. It is possible to remove a child without setting the removed
child pointer to NULL, thus leaving it still accessible as a dangling
pointer. Subsequent use of this pointer allows for remote code execution.

- -- Vendor Response:
Mozilla has issued an update to correct this vulnerability. More details
can be found at:
http://www.mozilla.org/security/announce/2012/mfsa2012-04.html


- -- Disclosure Timeline:
2011-12-01 - Vulnerability reported to vendor
2012-06-28 - 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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