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Microsoft .Net Form Authentication Insecure Redirect (MS11-100; CVE-2011-3415)

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Check Point Reference: CPAI-2011-602
Date Published:
Severity:
Source: Microsoft Security Bulletin MS11-100
Industry Reference(s): CVE-2011-3415
Protection Provided by: Security Gateway
  • R70
  • R71
  • R75
Who is Vulnerable?
Microsoft .NET Framework 2.0 Service Pack 2 when installed on Windows XP Service Pack 3
Microsoft .NET Framework 2.0 Service Pack 2 when installed on Windows XP Professional x64 Edition Service Pack 2
Microsoft .NET Framework 2.0 Service Pack 2 when installed on Windows Server 2003 Service Pack 2
Microsoft .NET Framework 2.0 Service Pack 2 when installed on Windows Server 2003 x64 Edition Service Pack 2
Microsoft .NET Framework 2.0 Service Pack 2 when installed on Windows Server 2003 with SP2 for Itanium-based Systems
Microsoft .NET Framework 2.0 Service Pack 2 when installed on Windows Vista Service Pack 2
Microsoft .NET Framework 2.0 Service Pack 2 when installed on Windows Vista x64 Edition Service Pack 2
Microsoft .NET Framework 2.0 Service Pack 2 when installed on Windows Server 2008 for 32-bit Systems Service Pack 2
Microsoft .NET Framework 2.0 Service Pack 2 when installed on Windows Server 2008 for x64-based Systems Service Pack 2
Microsoft .NET Framework 2.0 Service Pack 2 when installed on Windows Server 2008 for Itanium-based Systems Service Pack 2

Microsoft .NET Framework 3.5 Service Pack 1 when installed on Windows XP Service Pack 3
Microsoft .NET Framework 3.5 Service Pack 1 when installed on Windows XP Professional x64 Edition Service Pack 2
Microsoft .NET Framework 3.5 Service Pack 1 when installed on Windows Server 2003 Service Pack 2
Microsoft .NET Framework 3.5 Service Pack 1 when installed on Windows Server 2003 x64 Edition Service Pack 2
Microsoft .NET Framework 3.5 Service Pack 1 when installed on Windows Server 2003 with SP2 for Itanium-based Systems
Microsoft .NET Framework 3.5 Service Pack 1 when installed on Windows Vista Service Pack 2
Microsoft .NET Framework 3.5 Service Pack 1 when installed on Windows Vista x64 Edition Service Pack 2
Microsoft .NET Framework 3.5 Service Pack 1 when installed on Windows Server 2008 for 32-bit Systems Service Pack 2
Microsoft .NET Framework 3.5 Service Pack 1 when installed on Windows Server 2008 for x64-based Systems Service Pack 2
Microsoft .NET Framework 3.5 Service Pack 1 when installed on Windows Server 2008 for Itanium-based Systems Service Pack 2
Microsoft .NET Framework 3.5.1 on Windows 7 for 32-bit Systems and Windows 7 for 32-bit Systems Service Pack 1
Microsoft .NET Framework 3.5.1 on Windows 7 for x64-based Systems and Windows 7 for x64-based Systems Service Pack 1
Microsoft .NET Framework 3.5.1 on Windows Server 2008 R2 for x64-based Systems and Windows Server 2008 R2 for x64-based Systems Service Pack 1
Microsoft .NET Framework 3.5.1 on Windows Server 2008 R2 for Itanium-based Systems and Windows Server 2008 R2 for Itanium-based Systems Service Pack 1
Microsoft .NET Framework 4.0 on Windows XP Service Pack 3
Microsoft .NET Framework 4.0 on Windows XP Professional x64 Edition Service Pack 2
Microsoft .NET Framework 4.0 on Windows Server 2003 Service Pack 2
Microsoft .NET Framework 4.0 on Windows Server 2003 x64 Edition Service Pack 2
Microsoft .NET Framework 4.0 on Windows Server 2003 with SP2 for Itanium-based Systems
Microsoft .NET Framework 4.0 on Windows Vista Service Pack 2
Microsoft .NET Framework 4.0 on Windows Vista x64 Edition Service Pack 2
Microsoft .NET Framework 4.0 on Windows Server 2008 for 32-bit Systems Service Pack 2
Microsoft .NET Framework 4.0 on Windows Server 2008 for x64-based Systems Service Pack 2
Microsoft .NET Framework 4.0 on Windows Server 2008 for Itanium-based Systems Service Pack 2
Microsoft .NET Framework 4.0 on Windows 7 for 32-bit Systems and Windows 7 for 32-bit Systems Service Pack 1
Microsoft .NET Framework 4.0 on Windows 7 for x64-based Systems and Windows 7 for x64-based Systems Service Pack 1
Microsoft .NET Framework 4.0 on Windows Server 2008 R2 for x64-based Systems
Microsoft .NET Framework 4.0 on Windows Server 2008 R2 for x64-based Systems Service Pack 1
Microsoft .NET Framework 4.0 on Windows Server 2008 R2 for Itanium-based Systems and Windows Server 2008 R2 for Itanium-based Systems Service Pack 1
Vulnerability Description
A spoofing vulnerability has been reported in Microsoft .NET Framework.
Vulnerability Details
The vulnerability is due to an error in the way .NET Framework verifies return URLs during the forms authentication process. A remote attacker may exploit this vulnerability by enticing users to open a malicious link. Successful exploitation would allow an attacker to redirect users to a website of the attacker's choosing. The attacker may then perform a phishing attack to gain information that was not meant to be disclosed.

Protection Overview
IPS will detect and block malicious URLs.

In order for the protection to be activated, update your product to the latest update. For information on how to update , go to SBP-2006-05, Protection tab and select the version of your choice.

To configure the defense, select your product from the list below and follow the related protection steps.

Security Gateway R75 / R71 / R70

How Can I Protect My Network?
1. In the IPS tab, click Protections and find the Microsoft .Net Form Authentication Insecure Redirect (MS11-100) protection using the Search tool and Edit the protection's settings.
2. Install policy on all modules.

How Do I Know if My Network is Under Attack?
SmartView Tracker will log the following entries:
Attack Name: Web Server Enforcement Violation
Attack Information: Microsoft .Net form authentication insecure redirect (MS11-100)