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Category:   Application (Generic)  >   Microsoft Forefront Unified Access Gateway Vendors:   Microsoft
Microsoft Forefront Unified Access Gateway Input Validation Flaws Permits Cross-Site Scripting, HTTP Response Splitting, and Denial of Service Attacks
SecurityTracker Alert ID:  1026169
SecurityTracker URL:  http://securitytracker.com/id/1026169
CVE Reference:   CVE-2011-1895, CVE-2011-1896, CVE-2011-1897, CVE-2011-1969, CVE-2011-2012   (Links to External Site)
Date:  Oct 11 2011
Impact:   Denial of service via network, Disclosure of authentication information, Disclosure of user information, Execution of arbitrary code via network, Modification of user information, User access via network
Fix Available:  Yes  Vendor Confirmed:  Yes  
Version(s): 2010, 2010 Update 1, 2010 Update 2, 2010 SP1
Description:   Several vulnerabilities were reported in Microsoft Forefront Unified Access Gateway. A remote user can cause denial of service conditions. A remote user can conduct cross-site scripting attacks. A remote user can conduct HTTP response splitting attacks.

A remote user can send a specially crafted cookie containing a null value to cause the target IIS web service to crash [CVE-2011-2012].

A remote user can create a specially crafted URL that, when loaded by a target user, will cause arbitrary scripting code to be executed by the target user's browser [CVE-2011-1896, CVE-2011-1897]. The code will originate from the site running the Microsoft Forefront Unified Access Gateway software and will run in the security context of that site. As a result, the code will be able to access the target user's cookies (including authentication cookies), if any, associated with the site, access data recently submitted by the target user via web form to the site, or take actions on the site acting as the target user.

A remote user can submit a specially crafted URL to cause the target server to return a split response [CVE-2011-1895]. A remote user can exploit this to spoof content on the target server, attempt to poison any intermediate web caches, or conduct cross-site scripting attacks.

Tenable Network Security reported three of these vulnerabilities.

Impact:   A remote user can cause the target web service to crash.

A remote user can access the target user's cookies (including authentication cookies), if any, associated with the site running the Microsoft Forefront Unified Access Gateway software, access data recently submitted by the target user via web form to the site, or take actions on the site acting as the target user.

A remote user can create a URL that, when loaded by the target user, will cause arbitrary content to be displayed.

A remote user may be able to poison any intermediate web caches with arbitrary content.

Solution:   The vendor has issued the following fixes:

Microsoft Forefront Unified Access Gateway 2010:

http://www.microsoft.com/downloads/details.aspx?familyid=770ad8ba-4d9a-404e-9515-6ed1e41682df

Microsoft Forefront Unified Access Gateway 2010 Update 1:

http://www.microsoft.com/downloads/details.aspx?familyid=b0de8d20-9c25-41c0-9c02-d263b9ed22fa

Microsoft Forefront Unified Access Gateway 2010 Update 2:

http://www.microsoft.com/downloads/details.aspx?familyid=166bdfcb-5088-4471-9d51-a3071ac13b73

Microsoft Forefront Unified Access Gateway 2010 Service Pack 1:

http://www.microsoft.com/downloads/details.aspx?familyid=8b6ad2ae-e168-45d9-bd3f-5590e0cbd2b5

A restart may be required.

The Microsoft advisory is available at:

http://technet.microsoft.com/en-us/security/bulletin/ms11-079

Vendor URL:  technet.microsoft.com/en-us/security/bulletin/ms11-079 (Links to External Site)
Cause:   Input validation error
Underlying OS:  Windows (2008)

Message History:   None.


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