Microsoft ASP.NET Hash Collision Denial Of Service Vulnerability

Bugtraq ID:	51186
Class:	Failure to Handle Exceptional Conditions
CVE:	CVE-2011-3414
Remote:	Yes
Local:	No
Published:	Dec 28 2011 12:00AM
Updated:	Jan 10 2012 05:40PM
Credit:	Microsoft
Vulnerable:	Microsoft .NET Framework 3.5.1 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 Microsoft .NET Framework 1.1 SP1 Microsoft .NET Framework 1.1 Microsoft .NET Framework 1.0 SP3 Microsoft .NET Framework 1.0 SP2 Microsoft .NET Framework 1.0 SP1 Microsoft .NET Framework 1.0 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 ASP.NET Hash Collision Denial Of Service Vulnerability

Microsoft ASP.NET is prone to a denial-of-service vulnerability.

An attacker can exploit this issue by sending a small number of specially crafted ASP.NET form posts to an affected ASP.NET site.

Successful exploits will attackers to disrupt the availability of sites that use ASP.NET

Microsoft ASP.NET Hash Collision Denial Of Service Vulnerability

An attacker can use readily available tools to exploit this issue.

Microsoft ASP.NET Hash Collision Denial Of Service Vulnerability

Solution:
The vendor has released an advisory and fixes. Please see the references for details.


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 ASP.NET Hash Collision Denial Of Service Vulnerability

References:

• Microsoft Homepage (Microsoft)
  
• ASA-2012-006 MS11-100 Vulnerability in ASP.NET Could Allow Denial of Service (26 (Avaya)
  
• Microsoft Security Advisory (2659883) (Microsoft)
  
• Microsoft Security Bulletin MS11-100 - Critical (Microsoft)