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Apache Tomcat NIO Connector Denial of Service (CVE-2012-4534)


Check Point Reference: CPAI-2013-011
Date Published:
Source: Apache Advisory SA51425
Industry Reference(s): CVE-2012-4534
Protection Provided by: Security Gateway
  • R75
Who is Vulnerable?
Apache Software Foundation Tomcat 6.x prior to 6.0.36
Apache Software Foundation Tomcat 7.x prior to 7.0.28
Vulnerability Description
A denial of service vulnerability exists in Apache Tomcat.
Vulnerability Details
The vulnerability is due to an infinite loop in NIO Connector when a client breaks the connection in the middle of reading the response for a request to a big file. An unauthenticated, remote attacker can exploit this vulnerability by sending HTTP requests for a large file and disconnecting from the server while reading the file. Successful exploitation could result in a denial of service condition.

Protection Overview
This protection will detect and block malicious HTTP requests.

In order for the protection to be activated, update your product to the latest update. For information on how to update , 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 Apache Tomcat NIO Connector Denial of Service 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: Apache Server Protection Violation
Attack Information: Apache Tomcat NIO Connector Denial of Service