full-disclosure - ZDI-11-135: (Pwn2Own) WebKit WBR Tag Removal Remote Code Execution Vulnerability

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Date: Thu, 14 Apr 2011 20:36:05 +0000
From: ZDI Disclosures <zdi-disclosures@...pingpoint.com>
To: "'full-disclosure@...ts.grok.org.uk'" <full-disclosure@...ts.grok.org.uk>, 
	"'bugtraq@...urityfocus.com'" <bugtraq@...urityfocus.com>
Subject: ZDI-11-135: (Pwn2Own) WebKit WBR Tag Removal
 Remote Code Execution Vulnerability

ZDI-11-135: (Pwn2Own) WebKit WBR Tag Removal Remote Code Execution Vulnerability

http://www.zerodayinitiative.com/advisories/ZDI-11-135

April 14, 2011

-- CVE ID:
CVE-2011-1344

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

-- Affected Vendors:
WebKit

-- Affected Products:
WebKit WebKit

-- TippingPoint(TM) IPS Customer Protection:
TippingPoint IPS customers have been protected against this
vulnerability by Digital Vaccine protection filter ID 10970. 
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 Webkit. 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 the Webkit library handles WBR
tags on a webpage. By adding children to a WBR tag and then consequently
removing the tag through, for example, a 'removeChild' call it is
possible to create a dangling pointer that can result in remote code
execution under the context of the current user.

-- Vendor Response:
Google patch on March 12, 2011:
http://googlechromereleases.blogspot.com/2011/03/stable-and-beta-channel-updates.html

Apple patch on April 14, 2011:
http://support.apple.com/kb/HT4606
http://support.apple.com/kb/HT4607
http://support.apple.com/kb/HT4596

-- Disclosure Timeline:
2011-03-31 - Vulnerability reported to vendor
2011-04-14 - Coordinated public release of advisory

-- Credit:
This vulnerability was discovered by:
    * Vupen Security

-- 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/

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