Check Point Advisories

Squid strListGetItem Denial of Service (CVE-2009-2855)

Vulnerability
Protection

Check Point Reference:	CPAI-2009-414
Date Published:	9 May 2010
Severity:	Medium
Last Updated:	Tuesday 18 July, 2017
Source:
Industry Reference:	CVE-2009-2855
Protection Provided by:	Security Gateway R81, R80, R77, R75
Who is Vulnerable?	Squid Project Squid 2.6 Squid Project Squid 2.7 Squid Project Squid 3.0 Squid Project Squid 3.1
Vulnerability Description	A denial of service vulnerability exists in the way Squid handles HTTP headers. The vulnerability is due to an infinite loop error when processing HTTP headers containing a specific delimiter character. Remote unauthenticated attackers can exploit this vulnerability by sending specially crafted HTTP request packets containing malicious HTTP headers. Successful exploitation would consume system resources and may cause the service to terminate.

Protection Overview

This protection will detect and block attempts to exploit this vulnerability.

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 Squid strListGetItem 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: Proxy Server Enforcement Violation.
Attack Information: Squid strListGetItem Denial of Service