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AUSCERT External Security Bulletin Redistribution
ESB-2011.0638
Vulnerability in Active Directory Certificate Services Web Enrollment Could
Allow Elevation of Privilege (2518295)
15 June 2011
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AusCERT Security Bulletin Summary
---------------------------------
Product: Active Directory Certificate Services Web Enrollment
Publisher: Microsoft
Operating System: Windows Server 2003
Windows Server 2008
Impact/Access: Increased Privileges -- Remote with User Interaction
Cross-site Scripting -- Remote/Unauthenticated
Resolution: Patch/Upgrade
CVE Names: CVE-2011-1264
Original Bulletin:
http://www.microsoft.com/technet/security/Bulletin/MS11-051.mspx
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Microsoft Security Bulletin MS11-051 - Important
Vulnerability in Active Directory Certificate Services Web Enrollment Could
Allow Elevation of Privilege (2518295)
Published: June 14, 2011
Version: 1.0
General Information
Executive Summary
This security update resolves a privately reported vulnerability in Active
Directory Certificate Services Web Enrollment. The vulnerability is a
cross-site scripting (XSS) vulnerability that could allow elevation of
privilege, enabling an attacker to execute arbitrary commands on the site in
the context of the target user. An attacker who successfully exploited this
vulnerability would need to send a specially crafted link and convince a user
to click the link. In all cases, however, an attacker would have no way to
force a user to visit the Web site. Instead, an attacker would have to
persuade a user to visit the Web site, typically by getting them to click a
link in an e-mail message or Instant Messenger message that takes the user to
the vulnerable Web site.
This security update is rated Important for all supported editions, except
Itanium, of Windows Server 2003, Windows Server 2008, and Windows Server 2008
R2. For more information, see the subsection, Affected and Non-Affected
Software, in this section.
The security update addresses the vulnerability by correcting the manner in
which the Active Directory Certificate Services Web Enrollment site validates
input parameters. For more information about the vulnerability, see the
Frequently Asked Questions (FAQ) subsection for the specific vulnerability
entry under the next section, Vulnerability Information.
Affected Software
Windows Server 2003 Service Pack 2
Windows Server 2003 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 R2 for x64-based Systems
Windows Server 2008 R2 for x64-based Systems Service Pack 1**
**Server Core installation not affected. The vulnerabilities addressed by this
update do not affect supported editions of Windows Server 2008 or Windows
Server 2008 R2 as indicated, when installed using the Server Core installation
option. For more information on this installation option, see the TechNet
articles, Managing a Server Core Installation and Servicing a Server Core
Installation. Note that the Server Core installation option does not apply to
certain editions of Windows Server 2008 and Windows Server 2008 R2; see
Compare Server Core Installation Options.
Vulnerability Information
Active Directory Certificate Services Vulnerability - CVE-2011-1264
A reflected XSS vulnerability exists in Active Directory Certificate Services
Web Enrollment that could allow an attacker to inject a client-side script
into the user's instance of Internet Explorer. The script could spoof content,
disclose information, or take any action that the user could take on the site
on behalf of the targeted user.
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The University of Queensland
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