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Microsoft Internet Explorer Property Memory Corruption Vulnerability

12.02.08

BACKGROUND

Internet Explorer is a graphical web browser developed by Microsoft Corp. that has been included with Microsoft Windows since 1995. For more information about Internet Explorer, visit following URL.

http://www.microsoft.com/ie/

DESCRIPTION

Remote exploitation of a memory corruption vulnerability in Microsoft Corp.'s Internet Explorer web browser allows attackers to execute arbitrary code within the context of the affected user.

When certain properties are assigned malformed values, memory can be corrupted in a way that leads to Internet Explorer making a call to a member function of an already released property object. If the memory location of the released property object happens to be filled by attacker controlled content, the attacker can execute arbitrary code.

ANALYSIS

Exploitation of this vulnerability would allow an attacker to execute arbitrary code in the context of the user running Internet Explorer. In order to be successful, a targeted user must render a maliciously crafted web page.

On Vista, Internet Explorer 7 runs in Protected Mode, which has less privileges than a normal user. It somewhat mitigates the impact of this vulnerability, but does not prevent arbitrary code execution.

DETECTION

iDefense testing shows that Internet Explorer 6.0 and Internet Explorer 7.0, with all available security patches as of October 22nd, 2007, are vulnerable. Older versions of Internet Explorer may also be vulnerable.

WORKAROUND

Disabling active scripting for the Internet Zone can effectively mitigate this issue.

VENDOR RESPONSE

Microsoft has officially addressed this vulnerability with Security Bulletin MS08-010. For more information, consult their bulletin at the following URL.

http://www.microsoft.com/technet/security/Bulletin/ms08-010.mspx

CVE INFORMATION

The Common Vulnerabilities and Exposures (CVE) project has assigned the name CVE-2008-0077 to this issue. This is a candidate for inclusion in the CVE list (http://cve.mitre.org/), which standardizes names for security problems.

DISCLOSURE TIMELINE

10/24/2007 Initial vendor notification
10/24/2007 Initial vendor response
02/12/2008 Coordinated public disclosure

CREDIT

This vulnerability was reported to VeriSign iDefense by hyy.

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LEGAL NOTICES

Copyright © 2008 Verisign, Inc.

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