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The vulnerability is caused due to an error in the way the MHTML (MIME Encapsulation of Aggregate HTML) protocol handler interprets MIME-formatted requests for content blocks within a document.
This can e.g. be exploited via Internet Explorer to execute arbitrary HTML and script code in a user's browser session in context of a web site.
Microsoft is aware of published information and proof-of-concept code that attempts to exploit this vulnerability. At this time, Microsoft has not seen any indications of active exploitation of the vulnerability.
Solution: Enable MHTML protocol lockdown (either manually or using the available automated "Microsoft Fix it" solution).
Affected Software:
- Windows XP Service Pack 3
- Windows XP Professional x64 Edition Service Pack 2
- Windows Server 2003 Service Pack 2
- Windows Server 2003 x64 Edition Service Pack 2
- Windows Server 2003 with SP2 for Itanium-based Systems
- Windows Vista Service Pack 1 and Windows Vista Service Pack 2
- Windows Vista x64 Edition Service Pack 1 and Windows Vista x64 Edition Service Pack 2
- Windows Server 2008 for 32-bit Systems and Windows Server 2008 for 32-bit Systems Service Pack 2 (Server Core installation not affected)
- Windows Server 2008 for x64-based Systems and Windows Server 2008 for x64-based Systems Service Pack 2 (Server Core installation not affected)
- Windows Server 2008 for Itanium-based Systems and Windows Server 2008 for Itanium-based Systems Service Pack 2
- Windows 7 for 32-bit Systems
- Windows 7 for x64-based Systems
- Windows Server 2008 R2 for x64-based Systems (Server Core installation not affected)
- Windows Server 2008 R2 for Itanium-based Systems.
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