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Microsoft Security Advisory (2458511)

Microsoft Security Advisory (2458511)
Vulnerability in Internet Explorer Could Allow Remote Code Execution
Published: November 03, 2010

Microsoft is investigating new, public reports of a vulnerability in all supported versions of Internet Explorer. The main impact of the vulnerability is remote code execution. This advisory contains workarounds and mitigations for this issue.

The vulnerability exists due to an invalid flag reference within Internet Explorer. It is possible under certain conditions for the invalid flag reference to be accessed after an object is deleted. In a specially-crafted attack, in attempting to access a freed object, Internet Explorer can be caused to allow remote code execution.

At this time, we are aware of targeted attacks attempting to use this vulnerability. We will continue to monitor the threat environment and update this advisory if this situation changes. On completion of this investigation, Microsoft will take the appropriate action to protect our customers, which may include providing a solution through our monthly security update release process, or an out-of-cycle security update, depending on customer needs.

We are actively working with partners in our Microsoft Active Protections Program (MAPP) and our Microsoft Security Response Alliance (MSRA) programs to provide information that they can use to provide broader protections to customers. In addition, we are actively working with partners to monitor the threat landscape and take action against malicious sites that attempt to exploit this vulnerability.

Affected Software
Internet Explorer 6
Internet Explorer 7
Internet Explorer 8

Workarounds
Override the Web site CSS style with a user defined CSS
Deploy the Enhanced Mitigation Experience Toolkit
Enable Data Execution Prevention (DEP) for Internet Explorer 7
Read e-mails in plain text
Set Internet and Local intranet security zone settings to "High" to block ActiveX Controls and Active Scripting in these zones

http://www.microsoft.com/technet/security/advisory/2458511.mspx

Internet Explorer 9 Beta users are not affected by this issue and any customers who wish to upgrade their browser to this version can do so freely at www.microsoft.com/ie. Impacted versions include Internet Explorer 6, 7 and 8, although our ongoing investigation confirms that default installations of Internet Explorer 8 are unlikely to be exploited by this issue. This is due to the defense in depth protections offered from Data Execution Prevention (DEP), which is enabled by default in Internet Explorer 8 on all supported Windows platforms.

http://blogs.technet.com/b/msrc/archive/2010/11/02/microsoft-releases-security-advisory-2458511.aspx

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