Check Point Advisories

Squid Proxy Denial of Service (CVE-2021-28662)

Vulnerability
Protection

Check Point Reference:	CPAI-2021-1472
Date Published:	8 Dec 2022
Severity:	Medium
Last Updated:	Thursday 08 December, 2022
Source:
Industry Reference:	CVE-2021-28662
Protection Provided by:	Security Gateway R81, R80, R77, R75
Who is Vulnerable?	Squid 4.x before 4.15 Squid 5.x before 5.0.6
Vulnerability Description	A denial-of-service vulnerability exists in Squid Proxy. The vulnerability is due to invalid processing of HTTP 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 R81 / R80 / R77 / R75

In the IPS tab, click Protections and find the Squid Proxy Denial of Service (CVE-2021-28662) 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: Application Servers Protection Violation.
Attack Information: Squid Proxy Denial of Service (CVE-2021-28662)