CERT-In Vulnerability Note
CIVN-2011-0195
Microsoft ASP.NET Hash Collision Denial of Service Attack
Original Issue Date:December 29, 2011
Severity Rating: MEDIUM
Systems Affected
- Windows XP SP3
- Windows XP Professional x64 Edition SP2
- Windows Server 2003 SP2 (32 & 64 editions)
- Windows Server 2003 with SP2 for Itanium-based Systems
- Windows Vista SP2 (32 & 64 editions)
- Windows Server 2008 SP2 (32 & 64 editions)
- Windows 7 & SP1 ( 32 & 64 editions)
- Windows Server 2008 R2 for x64-based Systems SP1 and prior
- Windows Server 2008 R2 for Itanium-based Systems SP1 and prior
Component Affected
- Microsoft .NET Framework 1.0 SP 3
- Microsoft .NET Framework 1.1 SP 1
- Microsoft .NET Framework 2.0 SP 2
- Microsoft .NET Framework 3.5 SP 1
- Microsoft .NET Framework 3.5.1
- Microsoft .NET Framework 4
Overview
A denial of service vulnerability has been reported in Microsoft Windows ASP.NET due to insufficient randomization of hash functions when handling specially crafted POST form data.
Description
The vulnerability occurs due to the way that ASP.NET processes values in an ASP.NET form post that causes a hash collision. (ASP.NET uses the Request.Form object of class NameValueCollection.to provide POST data to a web application developer).
An unauthenticated attacker could send a small number of specifically crafted ASP.NET form posts to an affected ASP.NET site, causing a denial of service condition.
Workaround
Apply appropriate workarounds as mentioned in Microsoft Security Advisory
2659883
Vendor Information
Microsoft Corporation
http://technet.microsoft.com/en-us/security/advisory/2659883
References
Microsoft Corporation
http://technet.microsoft.com/en-us/security/advisory/2659883
http://support.microsoft.com/kb/820129
US CERT
http://www.kb.cert.org/vuls/id/903934
SecurityTracker
http://www.securitytracker.com/id/1026469
CVE Name
CVE-2011-3414
Disclaimer
The information provided herein is on "as is" basis, without warranty of any kind.
Contact Information
Email: info@cert-in.org.in Phone: +91-11-24368572
Postal address
Indian Computer Emergency Response Team (CERT-In)
Ministry of Electronics and Information Technology
Government of India
Electronics Niketan
6, CGO Complex, Lodhi Road,
New Delhi - 110 003
India
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