Microsoft .NET Framework CVE-2011-3416 ASP.NET Forms Authentication Bypass Vulnerability

Bugtraq ID:	51201
Class:	Design Error
CVE:	CVE-2011-3416
Remote:	Yes
Local:	No
Published:	Dec 29 2011 12:00AM
Updated:	Mar 28 2012 11:40PM
Credit:	SEC Consult Vulnerability Lab
Vulnerable:	Microsoft .NET Framework 4.0 Microsoft .NET Framework 3.5 SP1 Microsoft .NET Framework 3.5 Microsoft .NET Framework 2.0 SP2 Microsoft .NET Framework 2.0 SP1 Microsoft .NET Framework 2.0 Microsoft .NET Framework 1.1 SP3 Microsoft .NET Framework 1.1 SP2 Microsoft .NET Framework 1.1 SP1 Microsoft .NET Framework 1.1 Avaya Messaging Application Server 5.2 Avaya Messaging Application Server 5 Avaya Messaging Application Server 4 Avaya Meeting Exchange - Webportal 0 Avaya Meeting Exchange - Web Conferencing Server 0 Avaya Meeting Exchange - Streaming Server 0 Avaya Meeting Exchange - Recording Server 0 Avaya Meeting Exchange - Client Registration Server 0 Avaya Meeting Exchange 5.0 .0.52 Avaya Meeting Exchange 5.2 SP2 Avaya Meeting Exchange 5.2 SP1 Avaya Meeting Exchange 5.2 Avaya Meeting Exchange 5.1 SP1 Avaya Meeting Exchange 5.1 Avaya Meeting Exchange 5.0 SP2 Avaya Meeting Exchange 5.0 SP1 Avaya Meeting Exchange 5.0 Avaya Communication Server 1000 Telephony Manager 4.0 Avaya Communication Server 1000 Telephony Manager 3.0 Avaya CallPilot 5.0 Avaya CallPilot 4.0 Avaya Aura Conferencing 6.0 Standard
Not Vulnerable:

Microsoft .NET Framework CVE-2011-3416 ASP.NET Forms Authentication Bypass Vulnerability

Microsoft .NET Framework is prone to a authentication-bypass vulnerability in ASP.NET.

An attacker can exploit this issue to gain unauthorized access to another users account. Successful exploits will allow attackers to execute arbitrary commands with the privileges of the targeted user.

Microsoft .NET Framework CVE-2011-3416 ASP.NET Forms Authentication Bypass Vulnerability

Attackers can exploit this issue using readily available tools.

A video demonstrating the exploit is available. Please see the references for information.

Microsoft .NET Framework CVE-2011-3416 ASP.NET Forms Authentication Bypass Vulnerability

Solution:
The vendor released an update. Please see the references for more information.


Microsoft .NET Framework 2.0 SP2

• Microsoft Security Update for Microsoft .NET Framework 2.0 Service Pack 2 on Windows Server 2003 and Windows X
  http://www.microsoft.com/downloads/details.aspx?familyid=eff633f7-abd9 -45cc-acbd-4885123dbed2


• Microsoft Security Update for Microsoft .NET Framework 2.0 Service Pack 2 on Windows Vista Service Pack 2 and
  http://www.microsoft.com/downloads/details.aspx?familyid=49050cf2-949a -40e5-b2ee-6257a3837294

Microsoft .NET Framework 4.0

• Microsoft Security Update for Microsoft .NET Framework 4
  http://www.microsoft.com/downloads/details.aspx?familyid=37a8fb34-e3ad -4605-980b-28361889ce72

Microsoft .NET Framework 1.1 SP1

• Microsoft Security Update for Microsoft .NET Framework 1.1 Service Pack 1 on Windows Server 2003 Service Pack
  http://www.microsoft.com/downloads/details.aspx?familyid=7538762a-50e9 -4f13-a60e-ff99aa8fbbf8


• Microsoft Security Update for Microsoft .NET Framework 1.1 Service Pack 1 on Windows XP, Windows Server 2003 (
  http://www.microsoft.com/downloads/details.aspx?familyid=471e1f51-c79c -4285-9f1e-aee1e4c4f189

Microsoft .NET Framework 3.5 SP1

• Microsoft Security Update for Microsoft .NET Framework 3.5 Service Pack 1 on Windows XP, Windows Server 2003,
  http://www.microsoft.com/downloads/details.aspx?familyid=306acd0a-bea2 -40dd-a639-f381587c9eb7


• Microsoft Security Update for Microsoft .NET Framework 3.5.1 on Windows 7 and Windows Server 2008 R2
  http://www.microsoft.com/downloads/details.aspx?familyid=2de28d32-1efd -4177-82e6-19a08266096c


• Microsoft Security Update for Microsoft .NET Framework 3.5.1 on Windows 7 Service Pack 1 and Windows Server 20
  http://www.microsoft.com/downloads/details.aspx?familyid=26e0b56d-9228 -49cf-9276-0741257567a9

Microsoft .NET Framework CVE-2011-3416 ASP.NET Forms Authentication Bypass Vulnerability

References:

• .NET Framework Homepage (Microsoft)
  
• Microsoft Homepage (Microsoft)
  
• SEC Consult SA-20120328-1 :: Microsoft ASP.NET Forms Authentication Bypass - fol (SEC Consult Vulnerability Lab)
  
• ASA-2012-006 MS11-100 Vulnerability in ASP.NET Could Allow Denial of Service (26 (Avaya)
  
• Critical authentication bypass in Microsoft ASP.NET Forms - CVE-2011-3416 (SEC Consult Vulnerability Lab Security Advisory )
  
• Microsoft Security Bulletin MS11-100 - Critical (Microsoft)