Hash: SHA1

             AUSCERT External Security Bulletin Redistribution

          Vulnerability in Microsoft ISA Server 2006 Could Cause
                      Elevation of Privilege (970953)
                               15 July 2009


        AusCERT Security Bulletin Summary

Product:           Microsoft ISA Server 2006
                   Microsoft Virtual PC
                   Microsoft Virtual Server
Publisher:         Microsoft
Operating System:  Windows
Impact/Access:     Administrator Compromise -- Remote/Unauthenticated
Resolution:        Patch
CVE Names:         CVE-2009-1135  

Original Bulletin: 

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

Microsoft Security Bulletin MS09-031 - Important

Vulnerability in Microsoft ISA Server 2006 Could Cause Elevation of Privilege 

Published: July 14, 2009

Version: 1.0

General Information

Executive Summary

   This security update resolves a privately reported vulnerability in 
   Microsoft Internet Security and Acceleration (ISA) Server 2006. The 
   vulnerability could allow elevation of privilege if an attacker 
   successfully impersonates an administrative user account for an ISA 
   server that is configured for Radius One Time Password (OTP) 
   authentication and authentication delegation with Kerberos Constrained 

   This security update is rated Important for Microsoft Internet Security 
   and Acceleration (ISA) Server 2006. For more information, see the 
   subsection, Affected and Non-Affected Software, in this section.

   The security update addresses the vulnerability by rejecting requests 
   that cannot be authenticated using Radius OTP. For more information about 
   the vulnerability, see the Frequently Asked Questions (FAQ) subsection 
   for the specific vulnerability entry under the next section, 
   Vulnerability Information.

   Recommendation. Microsoft recommends that customers apply the update at 
                   the earliest opportunity.

   Known Issues. Microsoft Knowledge Base Article 970953 documents the 
                 currently known issues that customers may experience when 
                 installing this security update. The article also documents 
                 recommended solutions for these issues. When currently 
                 known issues and recommended solutions pertain only to 
                 specific releases of this software, this article provides 
                 links to further articles.

Affected Software

   Microsoft Internet Security and Acceleration Server 2006
   Microsoft Internet Security and Acceleration Server 2006 Supportability 
   Microsoft Internet Security and Acceleration Server 2006 Service Pack 1

Vulnerability Information
   Radius OTP Bypass Vulnerability - CVE-2009-1135

   An elevation of privilege vulnerability exists in ISA Server 2006 
   authentication when configured with Radius OTP. The vulnerability could 
   allow an unauthenticated user access to any Web published resource. With 
   knowledge of administrator account usernames, an attacker who 
   successfully exploited this vulnerability could take complete control of 
   systems relying on the ISA Server 2006 Web publishing rules for 
   authentication. An attacker could then install programs; view, change, or 
   delete data; or create new accounts with full user rights.

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


If you believe that your computer system has been compromised or attacked in 
any way, we encourage you to let us know by completing the secure National IT 
Incident Reporting Form at:


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