Operating System:



11 December 2012

Protect yourself against future threats.

Hash: SHA1

             AUSCERT External Security Bulletin Redistribution

         Vulnerability in IP-HTTPS Component Could Allow Security
                         Feature Bypass (2765809)
                             11 December 2012


        AusCERT Security Bulletin Summary

Product:           Windows
Publisher:         Microsoft
Operating System:  Windows Server 2008 R2
                   Windows Server 2012
Impact/Access:     Unauthorised Access -- Existing Account
Resolution:        Patch/Upgrade
CVE Names:         CVE-2012-2549  

Original Bulletin: 

- --------------------------BEGIN INCLUDED TEXT--------------------

Microsoft Security Bulletin MS12-083 - Important

Vulnerability in IP-HTTPS Component Could Allow Security Feature Bypass

Published Date: December 11, 2012

Version: 1.0

General Information

Executive Summary

This security update resolves a privately reported vulnerability in Microsoft
Windows. The vulnerability could allow security feature bypass if an attacker
presents a revoked certificate to an IP-HTTPS server commonly used in
Microsoft DirectAccess deployments. To exploit the vulnerability, an attacker
must use a certificate issued from the domain for IP-HTTPS server
authentication. Logging on to a system inside the organization would still
require system or domain credentials.

This security update is rated Important for all supported editions of Windows
Server 2008 R2 and Windows Server 2012.

Affected Software

Windows Server 2008 R2 for x64-based Systems 
Windows Server 2008 R2 for x64-based Systems Service Pack 1 
Windows Server 2008 R2 for Itanium-based Systems 
Windows Server 2008 R2 for Itanium-based Systems Service Pack 1 
Windows Server 2012 
Windows Server 2008 R2 for x64-based Systems (Server Core installation) 
Windows Server 2008 R2 for x64-based Systems Service Pack 1 (Server Core
Windows Server 2012 (Server Core installation) 

Vulnerability Information

Revoked Certificate Bypass Vulnerability - CVE-2012-2549

A security feature bypass vulnerability exists in Windows due to the way the
IP-HTTPS Component handles certificates. An attacker who successfully
exploited this vulnerability could bypass certificate validation checks.

- --------------------------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:


Australian Computer Emergency Response Team
The University of Queensland
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.
Comment: http://www.auscert.org.au/render.html?it=1967