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-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 =========================================================================== AUSCERT External Security Bulletin Redistribution ESB-2011.0006 Vulnerability in Graphics Rendering Engine Could Allow Remote Code Execution 5 January 2011 =========================================================================== AusCERT Security Bulletin Summary --------------------------------- Product: Windows Graphics Rendering Engine Publisher: Microsoft Operating System: Windows XP Windows Vista Windows Server 2003 Windows Server 2008 Impact/Access: Execute Arbitrary Code/Commands -- Remote with User Interaction Resolution: Mitigation CVE Names: CVE-2010-3970 Original Bulletin: http://www.microsoft.com/technet/security/advisory/2490606.mspx - --------------------------BEGIN INCLUDED TEXT-------------------- Microsoft Security Advisory (2490606) Vulnerability in Graphics Rendering Engine Could Allow Remote Code Execution Published: January 04, 2011 Version: 1.0 Executive Summary Microsoft is investigating new public reports of a vulnerability in the Windows Graphics Rendering Engine. An attacker who successfully exploited this vulnerability could run arbitrary code in the security context of the logged-on user. An attacker could then install programs; view, change, or delete data; or create new accounts with full user rights. Users whose accounts are configured to have fewer user rights on the system could be less impacted than users who operate with administrative user rights. We are not aware of attacks that try to use the reported vulnerability or of customer impact at this time. CVE Reference CVE-2010-3970 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 Windows Vista Service Pack 2 Windows Vista x64 Edition Service Pack 1 Windows Vista x64 Edition Service Pack 2 Windows Server 2008 for 32-bit Systems Windows Server 2008 for 32-bit Systems Service Pack 2** Windows Server 2008 for x64-based Systems Windows Server 2008 for x64-based Systems Service Pack 2** Windows Server 2008 for Itanium-based Systems Windows Server 2008 for Itanium-based Systems Service Pack 2 Non-Affected Software Windows 7 for 32-bit Systems Windows 7 for x64-based Systems Windows Server 2008 R2 for x64-based Systems Windows Server 2008 R2 for Itanium-based Systems **Server Core installation not affected. Mitigating Factors Mitigation refers to a setting, common configuration, or general best-practice, existing in a default state, that could reduce the severity of exploitation of a vulnerability. The following mitigating factors may be helpful in your situation: In a Web-based attack scenario, an attacker could host a Web site that contains a Web page that is used to exploit this vulnerability. In addition, compromised Web sites and Web sites that accept or host user-provided content or advertisements could contain specially crafted content that could exploit this vulnerability. In all cases, however, an attacker would have no way to force users to visit these Web sites. Instead, an attacker would have to convince users to visit the Web site, typically by getting them to click a link in an e-mail message or Instant Messenger message that takes users to the attackers Web site. The vulnerability cannot be exploited automatically through e-mail. For an attack to be successful, a user must open an attachment that is sent in an e-mail message. An attacker who successfully exploited this vulnerability could gain the same user rights as the logged-on user. Users whose accounts are configured to have fewer user rights on the system could be less impacted than users who operate with administrative user rights. Workarounds Workaround refers to a setting or configuration change that does not correct the underlying issue but would help block known attack vectors before a security update is available. Microsoft has tested the following workarounds and states in the discussion whether a workaround reduces functionality: Modify the Access Control List (ACL) on shimgvw.dll To modify the ACL on shimgvw.dll to be more restrictive, run the following commands from a command prompt as an administrator: For 32-bit editions of Windows XP and Windows Server 2003: Echo y| cacls %WINDIR%\SYSTEM32\shimgvw.dll /E /P everyone:N For 64-bit editions of Windows XP and Windows Server 2003: Echo y| cacls %WINDIR%\SYSTEM32\shimgvw.dll /E /P everyone:N Echo y| cacls %WINDIR%\SYSWOW64\shimgvw.dll /E /P everyone:N For 32-bit editions of Windows Vista and Windows Server 2008: takeown /f %WINDIR%\SYSTEM32\SHIMGVW.DLL icacls %WINDIR%\SYSTEM32\SHIMGVW.DLL /save %TEMP%\SHIMGVW_ACL.TXT icacls %WINDIR%\SYSTEM32\SHIMGVW.DLL /deny everyone:(F) For 64-bit editions of Windows Vista and Windows Server 2008: takeown /f %WINDIR%\SYSTEM32\SHIMGVW.DLL takeown /f %WINDIR%\SYSWOW64\SHIMGVW.DLL icacls %WINDIR%\SYSTEM32\SHIMGVW.DLL /save %TEMP%\SHIMGVW_ACL32.TXT icacls %WINDIR%\SYSWOW64\SHIMGVW.DLL /save %TEMP%\SHIMGVW_ACL64.TXT icacls %WINDIR%\SYSTEM32\SHIMGVW.DLL /deny everyone:(F) icacls %WINDIR%\SYSWOW64\SHIMGVW.DLL /deny everyone:(F) Impact of Workaround: Media files typically handled by the Graphics Rendering Engine will not be displayed properly. How to undo the workaround: Run the following commands from a command prompt as an administrator: For 32-bit editions of Windows XP and Windows Server 2003: cacls %WINDIR%\SYSTEM32\shimgvw.dll /E /R everyone For 64-bit editions of Windows XP and Windows Server 2003: cacls %WINDIR%\SYSTEM32\shimgvw.dll /E /R everyone cacls %WINDIR%\SYSWOW64\shimgvw.dll /E /R everyone For 32-bit editions of Windows Vista and Windows Server 2008: icacls %WINDIR%\SYSTEM32 /restore %TEMP%\SHIMGVW_ACL.TXT For 64-bit editions of Windows Vista and Windows Server 2008: icacls %WINDIR%\SYSTEM32 /restore %TEMP%\SHIMGVW_ACL32.TXT icacls %WINDIR%\SYSWOW64 /restore %TEMP%\SHIMGVW_ACL64.TXT - --------------------------END INCLUDED TEXT-------------------- You have received this e-mail bulletin as a result of your organisation's registration with AusCERT. The mailing list you are subscribed to is maintained within your organisation, so if you do not wish to continue receiving these bulletins you should contact your local IT manager. If you do not know who that is, please send an email to auscert@auscert.org.au and we will forward your request to the appropriate person. NOTE: Third Party Rights This security bulletin is provided as a service to AusCERT's members. As AusCERT did not write the document quoted above, AusCERT has had no control over its content. The decision to follow or act on information or advice contained in this security bulletin is the responsibility of each user or organisation, and should be considered in accordance with your organisation's site policies and procedures. AusCERT takes no responsibility for consequences which may arise from following or acting on information or advice contained in this security bulletin. NOTE: This is only the original release of the security bulletin. It may not be updated when updates to the original are made. If downloading at a later date, it is recommended that the bulletin is retrieved directly from the author's website to ensure that the information is still current. Contact information for the authors of the original document is included in the Security Bulletin above. If you have any questions or need further information, please contact them directly. Previous advisories and external security bulletins can be retrieved from: http://www.auscert.org.au/render.html?cid=1980 =========================================================================== Australian Computer Emergency Response Team The University of Queensland Brisbane Qld 4072 Internet Email: auscert@auscert.org.au Facsimile: (07) 3365 7031 Telephone: (07) 3365 4417 (International: +61 7 3365 4417) AusCERT personnel answer during Queensland business hours which are GMT+10:00 (AEST). On call after hours for member emergencies only. =========================================================================== -----BEGIN PGP SIGNATURE----- Comment: https://www.auscert.org.au/1967 iD8DBQFNI7yf/iFOrG6YcBERAhl6AJ4uCyK+jr8G6fIp9fndA4FdtJZoeQCeLZ7G UIAf4flRmJ9r6dL86MOhddc= =NQX0 -----END PGP SIGNATURE-----