full-disclosure - ZDI-10-176: Mozilla Firefox normalizeDocument Remote Code Execution Vulnerability

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Message-ID: <EE499D69B3D0714590B6FE9762B0461104BE5570ED@emb01.unity.local>
Date: Mon, 13 Sep 2010 13:27:26 -0500
From: ZDI Disclosures <zdi-disclosures@...pingpoint.com>
To: "Full Disclosure (full-disclosure@...ts.grok.org.uk)"
	<full-disclosure@...ts.grok.org.uk>, "Bugtraq (bugtraq@...urityfocus.com)"
	<bugtraq@...urityfocus.com>
Subject: ZDI-10-176: Mozilla Firefox normalizeDocument
 Remote Code Execution Vulnerability

ZDI-10-176: Mozilla Firefox normalizeDocument Remote Code Execution Vulnerability
http://www.zerodayinitiative.com/advisories/ZDI-10-176
September 13, 2010

-- CVE ID:
CVE-2010-2766

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

-- Affected Vendors:
Mozilla Firefox

-- Affected Products:
Mozilla Firefox 3.6.x

-- TippingPoint(TM) IPS Customer Protection:
TippingPoint IPS customers have been protected against this
vulnerability by Digital Vaccine protection filter ID 10463. 
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 flaw exists within the normalizeDocument function defined within
nsDocument.cpp. When handling children nodes the code does not account
for a varying number of children during normalization. An attacker can
abuse this problem along with the fact that the code does not validate
the child index is within bounds to access an invalid object and execute
arbitrary code under the context of the browser.

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

http://www.mozilla.org/security/announce/2010/mfsa2010-55.html

-- Disclosure Timeline:
2010-07-20 - Vulnerability reported to vendor
2010-09-13 - Coordinated public release of advisory

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

-- About the Zero Day Initiative (ZDI):
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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

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TippingPoint provides its customers with zero day protection through
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an official vendor patch is publicly available. Furthermore, with the
altruistic aim of helping to secure a broader user base, TippingPoint
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