Check Point Advisories

Web Servers Directory Traversal Evasion Attempt

Vulnerability
Protection

Check Point Reference:	CPAI-2021-0731
Date Published:	29 Sep 2021
Severity:	Critical
Last Updated:	Wednesday 29 September, 2021
Source:
Protection Provided by:	Security Gateway R81, R80, R77, R75
Who is Vulnerable?
Vulnerability Description	A directory traversal vulnerability exists multiple web servers. The vulnerability is due to an input validation error in the web server that does not properly sanitize directory traversal patterns. 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 Web Servers Directory Traversal Evasion Attempt 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: Web Servers Directory Traversal Evasion Attempt