Check Point Advisories

CODESYS Buffer Overflow (CVE-2021-34583)

Vulnerability
Protection

Check Point Reference:	CPAI-2021-1527
Date Published:	3 Jan 2023
Severity:	High
Last Updated:	Tuesday 03 January, 2023
Source:
Industry Reference:	CVE-2021-34583
Protection Provided by:	Security Gateway R81, R80, R77, R75
Who is Vulnerable?	CODESYS up to v1.1.9.22 (excluding)
Vulnerability Description	A buffer overflow vulnerability exists in CODESYS. 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 CODESYS Buffer Overflow (CVE-2021-34583) 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: CODESYS Buffer Overflow (CVE-2021-34583)