Check Point Advisories

Squid Proxy ESI Response Processing Denial of Service v2

Vulnerability
Protection

Check Point Reference:	CPAI-2018-0514
Date Published:	28 May 2018
Severity:	High
Last Updated:	Sunday 25 November, 2018
Source:
Protection Provided by:	Security Gateway R81, R80, R77, R75
Who is Vulnerable?	Squid
Vulnerability Description	A denial-of-service vulnerability exists in Squid Proxy. The vulnerability is due to incorrect pointer handling when processing ESI responses.

Protection Overview

This protection detects 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 Proxy ESI Response Processing Denial of Service v2 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: Web Server Enforcement Violation.
Attack Information: Squid Proxy ESI Response Processing Denial of Service v2