Check Point Advisories

PHP XML Parser Remote Code Execution (CVE-2021-21707)

Vulnerability
Protection

Check Point Reference:	CPAI-2021-1071
Date Published:	20 Feb 2022
Severity:	Medium
Last Updated:	Sunday 20 February, 2022
Source:
Industry Reference:	CVE-2021-21707
Protection Provided by:	Security Gateway R81, R80, R77, R75
Who is Vulnerable?	PHP versions 7.3.x prior to 7.3.33 PHP 7.4.x prior to 7.4.26 PHP 8.0.x prior to 8.0.13
Vulnerability Description	A remote code execution vulnerability exists in PHP XML Parser. Successful exploitation of this vulnerability could allow a remote attacker to execute arbitrary code on the affected system.

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 PHP XML Parser Remote Code Execution (CVE-2021-21707) 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 Client Enforcement Violation.
Attack Information: PHP XML Parser Remote Code Execution (CVE-2021-21707)