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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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