Check Point Advisories

Squid HTTP Host Header Port Handling Denial of Service (CVE-2013-4123)

Check Point Reference: CPAI-2013-2491
Date Published: 13 Oct 2013
Severity: Critical
Last Updated: Saturday 04 January, 2025
Source: CVE-2013-4123
Protection Provided by:

Security Gateway
R75
Who is Vulnerable? Squid Project Squid 3.2.x prior to 3.2.13
Squid Project Squid 3.3.x prior to 3.3.8
Vulnerability Description A denial-of-service vulnerability exists in Squid proxy.
Vulnerability DetailsA successful attack attempt would result in the termination of Squid proxy server creating a denial-of-service condition. The vulnerability is due to incorrect validation of port values in the HTTP Host header. A remote attacker could exploit this vulnerability by sending a specially crafted request to the vulnerable server.

Protection Overview

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

In order for the protection to be activated, update your product to the latest update. For information on how to update , go to SBP-2006-05, Protection tab and select the version of your choice.

Security Gateway R75 / R71 / R70

  1. In the IPS tab, click Protections and find the Squid HTTP Host Header Port Handling Denial of Service protection using the Search tool and Edit the protection's settings.
  2. Install policy on all modules.

SmartView Tracker will log the following entries:
Attack Name: Proxy Server Enforcement Violation
Attack Information: Squid HTTP Host Header Port Handling Denial of Service

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