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Microsoft ASP.NET and PHP Hash Collision Denial of Service - Specific (CVE-2011-3414)

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Check Point Reference: CPAI-2013-033
Date Published:
Severity:
Source: MS Advisory MS11-100
Industry Reference(s): CVE-2011-3414
Protection Provided by: Security Gateway
  • R70
  • R71
  • R75
Who is Vulnerable?
Microsoft .NET Framework 4 and prior
Vulnerability Description
A denial of service vulnerability has been reported in Microsoft ASP.NET and PHP. Successful exploitation could degrade performance significantly, possibly resulting in a denial of service condition.
Update/Patch Available
Apply patches from: MS11-100
Vulnerability Details
The vulnerability is caused due to the way common web framework implementations use hash tables to map parameters and values of web requests. A remote attacker may exploit this vulnerability by generating multiple requests containing colliding key values to an affected server.

Protection Overview
IPS will detect and block the transferring of malicious requests to the server.

In order for the protection to be activated, update your Security Gateway product to the latest IPS update. For information on how to update IPS, 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 ASP.NET and PHP Hash Collision Denial of Service - Specific 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 ASP.NET and PHP Hash Collision Denial of Service - Specific