Check Point Advisories

Apache Tomcat Large Chunked Transfer Denial of Service (CVE-2013-4322)

Vulnerability
Protection

Check Point Reference:	CPAI-2014-1059
Date Published:	5 Mar 2014
Severity:	High
Last Updated:	Thursday 13 March, 2014
Source:	Apache
Industry Reference:	CVE-2013-4322
Protection Provided by:	Security Gateway R81, R80, R77, R75
Who is Vulnerable?	Apache Software Foundation Tomcat 6.0.0 prior to 6.0.39 Apache Software Foundation Tomcat 7.0.0 prior to 7.0.50 Apache Software Foundation Tomcat 8.0.0-RC1 to 8.0.0-RC5
Vulnerability Description	A denial of service vulnerability has been reported in Apache Tomcat. This vulnerability is due to Tomcat not discarding any extensions included in very long Chunked-transfer requests, even if they were not processed. A remote attacker could exploit this vulnerability by sending a large amount of data to the server causing it to use up excessive resources.

Protection Overview

This protection will detect and block attempts to exploit this vulnerability.Note: This protection is supported from version R75.40VS and above and cannot be enforced by previous IPS gateway versions.

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, click on Protection tab and select the version of your choice.

Security Gateway R80 / R77 / R75

In the IPS tab, click Protections and find the Apache Tomcat Large Chunked Transfer Denial of Service protection using the Search tool and Edit the protection's settings.
Install policy on all Security Gateways.

This protection's log will contain the following information:

Attack Name: Apache Server Protection Violation.
Attack Information: Apache Tomcat Large Chunked Transfer Denial of Service