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Insecure Library Loading
Highly critical

Microsoft Windows CSRSS MsgBox Memory Corruption Vulnerability

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Description


A vulnerability has been reported in Microsoft Windows, which can be exploited by malicious people to compromise a user's system.

The vulnerability is caused due to a double-free error in the Client/Server Run-time Subsystem (CSRSS) within WINSRV.DLL when handling HardError messages.

Successful exploitation allows execution of arbitrary code when a user e.g. visits a malicious website.

NOTE: Various other unspecified vulnerabilities discovered internally by Microsoft have also been reported.


Solution:
Apply patches.

Further details available to Secunia VIM customers

Provided and/or discovered by:
Independently discovered by:
* NULL
* Tim Garnett, Determina Security Research.

Original Advisory:
MS07-021 (KB930178):
http://www.microsoft.com/technet/security/Bulletin/MS07-021.mspx

Microsoft:
http://blogs.technet.com/msrc/archive/2006/12/22/new-report-of-a-windows-vulnerability.aspx

Full-Disclosure:
http://lists.grok.org.uk/pipermail/full-disclosure/2006-December/051394.html

Determina Security Research:
http://www.determina.com/security.research/vulnerabilities/csrss-harderror.html

Deep Links:
Links available to Secunia VIM customers

Do you have additional information related to this advisory?

Please provide information about patches, mitigating factors, new versions, exploits, faulty patches, links, and other relevant data by posting comments to this Advisory. You can also send this information to vuln@secunia.com

Subject: Microsoft Windows CSRSS MsgBox Memory Corruption Vulnerability

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