Check Point Advisories

Squid Proxy FTP URI Processing Denial of Service (CVE-2007-0247)

Check Point Reference: CPAI-2007-221
Date Published: 25 Nov 2009
Severity: High
Last Updated: Wednesday 25 November, 2009
Source:
Industry Reference:CVE-2007-0247
Protection Provided by:

Security Gateway
R81, R80, R77, R75
Who is Vulnerable?
Vulnerability Description The Squid proxy server is a popular open source, Internet proxy and web caching application. It has a wide variety of uses, from speeding up a web server by caching repeated requests, to caching web, DNS and other network lookups for a group of people sharing network resources. It is primarily designed to run on Unix-like systems. There exists a denial of service vulnerability in the Squid proxy. The flaw is caused by improper handling of a crafted FTP URI in proxy requests. Successfull exploitation of this issue allows remote attackers to terminate a vulnerable Squid proxy server, creating a denial of service condition to legitimate users. Upon receiving a crafted FTP request message, the Squid proxy server will terminate and reset all established connections. However, the Squid monitor process will respawn 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 FTP URI Processing 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 FTP URI processing denial of service

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