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-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 =========================================================================== AUSCERT External Security Bulletin Redistribution ESB-2013.1614 Vulnerability in DirectAccess Could Allow Security Feature Bypass 13 November 2013 =========================================================================== AusCERT Security Bulletin Summary --------------------------------- Product: Microsoft DirectAccess Publisher: Microsoft Operating System: Windows XP Windows Server 2003 Windows Vista Windows Server 2008 Windows 7 Windows Server 2008 R2 Windows 8 Windows Server 2012 Windows RT Impact/Access: Unauthorised Access -- Remote with User Interaction Provide Misleading Information -- Remote with User Interaction Resolution: Patch/Upgrade CVE Names: CVE-2013-3876 Original Bulletin: http://technet.microsoft.com/en-us/security/advisory/2862152 - --------------------------BEGIN INCLUDED TEXT-------------------- Microsoft Security Advisory (2862152) Vulnerability in DirectAccess Could Allow Security Feature Bypass Published: Tuesday, November 12, 2013 Version: 1.0 General Information Executive Summary Microsoft is announcing the availability of an update for all supported releases of Windows to address a vulnerability in how DirectAccess authenticates DirectAccess server connections to DirectAccess clients. An attacker who successfully exploited the vulnerability could use a specially crafted DirectAccess server to pose as a legitimate DirectAccess Server in order to establish connections with legitimate DirectAccess clients. The attacker-controlled system, appearing to be a legitimate server, could cause a client system to automatically authenticate and connect with the attacker-controlled system, allowing the attacker to intercept the target user's network traffic and potentially determine their encrypted domain credentials. Microsoft is not aware of any active attacks that are exploiting this vulnerability as of the release of this advisory. Affected Operating System Windows XP Service Pack 3 Microsoft Windows XP Professional x64 Edition Service Pack 2 Windows Server 2003 Service Pack 2 Microsoft Windows Server 2003 x64 Edition Service Pack 2 Microsoft Windows Server 2003 for Itanium-based Systems Service Pack 2 Windows Vista Service Pack 1 Windows Vista x64 Edition Service Pack 2 Windows Server 2008 for 32-bit Systems Service Pack 2 Windows Server 2008 for x64-based Systems Service Pack 2 Windows Server 2008 for Itanium-Based Systems Service Pack 2 Windows 7 for 32-bit Systems Service Pack 1 Windows 7 for x64-based Systems Service Pack 1 Windows Server 2008 R2 for x64-based Systems Service Pack 1 Windows Server 2008 R2 for Itanium-Based Systems Service Pack 1 Windows 8 for 32-bit Systems (except Embedded edition) Windows 8 for x64-based Systems (except Embedded edition) Windows Server 2012 Windows RT Windows 8.1 for 32-bit Systems Windows 8.1 for x64-based Systems Windows Server 2012 R2 Windows RT 8.1 Server Core installation option Windows Server 2008 for 32-bit Systems Service Pack 2 (Server Core installation) Windows Server 2008 for x64-based Systems Service Pack 2 (Server Core installation) Windows Server 2008 R2 for x64-based Systems Service Pack 1 (Server Core installation) Windows Server 2012 (Server Core installation) Acknowledgments Microsoft thanks the following for working with us to help protect customers: Daniel Letkiewicz of Google for reporting the DirectAccess Spoofing Vulnerability (CVE-2013-3876) - --------------------------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). 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