Check Point Advisories

Squid Proxy Gopher Response Processing Denial of Service (CVE-2011-3205)

Vulnerability
Protection

Check Point Reference:	CPAI-2012-172
Date Published:	10 May 2012
Severity:	High
Last Updated:	Thursday 10 May, 2012
Source:
Industry Reference:	CVE-2011-3205
Protection Provided by:	Security Gateway R81, R80, R77, R75
Who is Vulnerable?
Vulnerability Description	A denial of service vulnerability has been reported in Squid proxy server. The vulnerability is due to a boundary error while parsing malformed Gopher responses. A remote attacker could exploit this vulnerability by setting up a Gopher server to send malicious responses. Successful exploitation could cause the server to crash, resulting in a denial of service condition.

Protection Overview

This protection will detect and block the transferring of a malicious response from a Gopher 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, 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 Proxy Gopher Response Processing 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 Proxy Gopher Response Processing Denial of Service