[Full-disclosure] ZDI-11-271: Mozilla Firefox appendChild DOM Tree Inconsistency Remote Code Execution Vulnerability

[ZDI Disclosures <zdi-disclosures@xxxxxxxxxxxxxxxx>]

ZDI-11-271: Mozilla Firefox appendChild DOM Tree Inconsistency Remote Code 
Execution Vulnerability

http://www.zerodayinitiative.com/advisories/ZDI-11-271

August 17, 2011

-- CVE ID:
CVE-2011-2378

-- 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 11458. 
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 results when .setUserData() handlers are used with an
object and .appendChild() is called within a handler. Ultimately the
import operation resulting from an .appendChild() is not guarded from
mutation, and invalid DOM trees can result. Invalid DOM trees can be
navigated resulting in dereferencing invalid pointers which can be
leveraged to execute arbitrary code 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/mfsa2011-30.html#cve-2011-2378

-- Disclosure Timeline:
2011-04-04 - Vulnerability reported to vendor
2011-08-17 - Coordinated public release of advisory

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

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