Check Point Advisories

Sourcefire Snort Packet Fragmentation Reassembly Denial of Service (CVE-2007-1398)

Vulnerability
Protection

Check Point Reference:	CPAI-2012-007
Date Published:	3 Jan 2012
Severity:	Critical
Last Updated:	Tuesday 03 January, 2012
Source:
Industry Reference:	CVE-2007-1398
Protection Provided by:	Security Gateway R81, R80, R77, R75
Who is Vulnerable?
Vulnerability Description	A denial of service vulnerability has been reported in Sourcefire Snort. The vulnerability is due to an error in Snort Intrusion Detection System when it reassembles fragmented packets. A remote attacker may exploit this vulnerability by sending malicious packets over UDP to an affected service. Successful exploitation could cause the service to become unresponsive, resulting in a denial of service condition.

Protection Overview

This protection will detect and block attempts to transfer malicious packets over UDP.

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 Sourcefire Snort Packet Fragmentation Reassembly 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: Security Products Enforcement Violation.
Attack Information: Sourcefire Snort packet fragmentation reassembly denial of service