Check Point Advisories

Squid Proxy Cache Update Denial of Service

Check Point Reference: CPAI-2007-355
Date Published: 13 Jul 2010
Severity: High
Last Updated: Tuesday 13 July, 2010
Source:
Protection Provided by:

Security Gateway
R81, R80, R77, R75
Who is Vulnerable?
Vulnerability Description There exists a denial of service vulnerability in Squid web proxy application. The flaw is due to incorrect bounds checking when processing crafted cache update reply messages. A remote unauthenticated attacker may trigger this vulnerability to terminate the affected service. Upon receiving a crafted HTTP request message, the Squid proxy server will terminate and reset all established connections. However, the Squid monitor process will re-spawn the worker process automatically which restores the proxy services. If the attack is launched continuously, the target Squid proxy may be put into a lasting denial-of-service condition.

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

  1. In the IPS tab, click Protections and find the Squid Proxy Cache Update Denial of Service protection using the Search tool and Edit the protection's settings.
  2. 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 cache update denial of service

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