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Category:   Application (Generic)  >   ASP.NET Vendors:   Microsoft
Microsoft ASP.NET Hash Table Collision Bug Lets Remote Users Deny Service
SecurityTracker Alert ID:  1026469
SecurityTracker URL:
CVE Reference:   CVE-2011-3414   (Links to External Site)
Updated:  Dec 29 2011
Original Entry Date:  Dec 28 2011
Impact:   Denial of service via network
Fix Available:  Yes  Vendor Confirmed:  Yes  
Version(s): 1.0 SP3, 1.1 SP1, 2.0 SP2, 3.5 SP1, 4
Description:   A vulnerability was reported in Microsoft ASP.NET. A remote user can cause denial of service conditions.

A remote user can send specially crafted posts to cause significant performance degradation on the target server.

The vulnerability occurs due to the way that ASP.NET processes values in an ASP.NET form post that causes a hash collision.

The original advisory is available at:

Alexander Klink of n.runs AG and Julian Walde of Technische Universitat Darmstadt reported this vulnerability. Scott A. Crosby and Dan S. Wallach of Rice University reported the theoretical attack.

Impact:   A remote user can cause performance to degrade on the target server.
Solution:   The vendor has issued a fix.

A patch matrix is available in the vendor's advisory.

The vendor's advisory is available at:

Vendor URL: (Links to External Site)
Cause:   Randomization error
Underlying OS:  Windows (2003), Windows (2008), Windows (7), Windows (Vista), Windows (XP)

Message History:   None.

 Source Message Contents

[Original Message Not Available for Viewing]

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