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Vulnerability Note VU#740636

Microsoft Windows CSRSS error handling vulnerability

Overview

The Microsoft Windows Client/Server Run-time Subsystem (CSRSS) process fails to properly handle error messages. This vulnerability may allow a remote attacker to execute arbitrary code.

I. Description

According to Microsoft Security Bulletin MS07-021:

    CSRSS is the user-mode portion of the Win32 subsystem. CSRSS stands for client/server run-time subsystem and is an essential subsystem that must be running at all times. CSRSS is responsible for console windows, creating and/or deleting threads.

The CSRSS process fails to properly handle error messages possibly allowing a double free vulnerability to occur.

More information is available in Microsoft Security Bulletin MS07-021.

Note that proof-of-concept code is available for this vulnerability.

II. Impact

A remote attacker may be able to execute arbitrary code on a vulnerable system.

III. Solution

Apply update from Microsoft

Microsoft has released an update for this vulnerability in Microsoft Security Bulletin MS07-021.

Systems Affected

VendorStatusDate NotifiedDate Updated
Microsoft CorporationVulnerable10-Apr-2007

References


http://www.microsoft.com/technet/security/bulletin/ms07-021.mspx
http://www.determina.com/security.research/vulnerabilities/csrss-harderror.html
http://www.kuban.ru/forum_new/forum2/files/19124.html
http://bugtraq.ru/cgi-bin/forum.mcgi?type=sb&b=21&m=140672
http://www.microsoft.com/technet/security/bulletin/ms07-021.mspx

Credit

This vulnerability was reported by Tim Garnett of Determina Security Research .

This document was written by Jeff Gennari.

Other Information

Date Public:2006-12-15
Date First Published:2007-04-11
Date Last Updated:2007-04-11
CERT Advisory: 
CVE-ID(s):CVE-2006-6797
NVD-ID(s):CVE-2006-6797
US-CERT Technical Alerts: 
Metric:7.44
Document Revision:12

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