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AUSCERT External Security Bulletin Redistribution
ESB-2009.1052
Vulnerability in Microsoft ISA Server 2006 Could Cause
Elevation of Privilege (970953)
15 July 2009
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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:
http://www.microsoft.com/technet/security/bulletin/ms09-031.mspx
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Microsoft Security Bulletin MS09-031 - Important
Vulnerability in Microsoft ISA Server 2006 Could Cause Elevation of Privilege
(970953)
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
Delegation.
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
Update
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.
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The University of Queensland
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