bugtraq - ZDI-10-102: Microsoft Internet Explorer Stylesheet Array Removal Remote Code Execution Vulnerability

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Message-ID: <EE499D69B3D0714590B6FE9762B0461104BD3C36C4@emb01.unity.local>
Date: Tue, 8 Jun 2010 12:33:45 -0500
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-10-102: Microsoft Internet Explorer Stylesheet Array Removal
 Remote Code Execution Vulnerability

ZDI-10-102: Microsoft Internet Explorer Stylesheet Array Removal Remote Code Execution Vulnerability
http://www.zerodayinitiative.com/advisories/ZDI-10-102
June 8, 2010

-- CVE ID:
CVE-2010-1262

-- Affected Vendors:
Microsoft

-- Affected Products:
Microsoft Internet Explorer 8

-- TippingPoint(TM) IPS Customer Protection:
TippingPoint IPS customers have been protected against this
vulnerability by Digital Vaccine protection filter ID 9735. 
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 Microsoft Internet Explorer. User
interaction is required in that a target must visit a malicious page.

The specific flaw exists within IE's support for the CStyleSheet object.
When a style sheet array is created it contains a reference to it's root
container. If the stylesheet was created as part of an element not in a
markup the root container can be freed when that element is destroyed.
When the application attempts to use the stylesheet after this, an
invalid pointer is utilized. This can be leveraged by attackers to
execute arbitrary code under the context of the user running the
browser.

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

http://www.microsoft.com/technet/security/bulletin/ms10-035.mspx

-- Disclosure Timeline:
2010-03-26 - Vulnerability reported to vendor
2010-06-08 - Coordinated public release of advisory

-- Credit:
This vulnerability was discovered by:
    * Peter Vreugdenhil (http://twitter.com/WTFuzz)

-- About the Zero Day Initiative (ZDI):
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disclosing discovered vulnerabilities.

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