ZDI-11-198: (Pwn2Own) Microsoft Internet Explorer Uninitialized Variable Information Leak Vulnerability

2011-06-19T00:00:00
ID SECURITYVULNS:DOC:26560
Type securityvulns
Reporter Securityvulns
Modified 2011-06-19T00:00:00

Description

ZDI-11-198: (Pwn2Own) Microsoft Internet Explorer Uninitialized Variable Information Leak Vulnerability

http://www.zerodayinitiative.com/advisories/ZDI-11-198

June 14, 2011

-- CVSS: 7.5, (AV:N/AC:L/Au:N/C:P/I:P/A:P)

-- Affected Vendors: Microsoft

-- Affected Products: Microsoft Internet Explorer

-- TippingPoint(TM) IPS Customer Protection: TippingPoint IPS customers have been protected against this vulnerability by Digital Vaccine protection filter ID 11255. For further product information on the TippingPoint IPS, visit:

http://www.tippingpoint.com

-- Vulnerability Details: This vulnerability allows remote attackers to leak information on vulnerable installations of Internet Explorer. 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 Internet Explorer that allows malicious users to leak information about the memory layout of an Internet Explorer process. When creating a new 'Option' HTML Element, the 'index' field of the object is not set to zero and can be used to leak the location of the global variable table. This can be used to defeat ASLR or to remove the need for heap spraying while exploiting a remote code execution flaw.

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

http://www.microsoft.com/technet/security/Bulletin/MS11-050.mspx

-- Disclosure Timeline: 2011-03-09 - Vulnerability reported to vendor 2011-06-14 - Coordinated public release of advisory

-- Credit: This vulnerability was discovered by: * Stephen Fewer of Harmony Security (www.harmonysecurity.com)

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