Check Point Advisories

Envoy Proxy Path Traversal (CVE-2021-29492)

Vulnerability
Protection

Check Point Reference:	CPAI-2021-1292
Date Published:	13 Sep 2023
Severity:	High
Last Updated:	Sunday 05 May, 2024
Source:
Industry Reference:	CVE-2021-29492
Protection Provided by:	Security Gateway R81, R80, R77, R75
Who is Vulnerable?	Envoy Proxy Up to 1.15.5 Envoy Proxy From 1.16.0 Up to 1.16.4 Envoy Proxy From 1.17.0 Up to 1.17.3 Envoy Proxy From 1.18.0 Up to 1.18.3
Vulnerability Description	A path traversal vulnerability exists in Envoy Proxy. Successful exploitation of this vulnerability could allow an attacker to access arbitrary files 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 Envoy Proxy Path Traversal (CVE-2021-29492) 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 Server Enforcement Violation.
Attack Information: Envoy Proxy Path Traversal (CVE-2021-29492)