Check Point Advisories

OpenVPN P_CONTROL Denial of Service (CVE-2017-7478)

Vulnerability
Protection

Check Point Reference:	CPAI-2017-0501
Date Published:	11 Jun 2017
Severity:	Medium
Last Updated:	Sunday 18 June, 2017
Source:	OpenVPN
Industry Reference:	CVE-2017-7478
Protection Provided by:	Security Gateway R81, R80, R77, R75
Who is Vulnerable?	OpenVPN Project OpenVPN prior to 2.3.15 OpenVPN Project OpenVPN prior to 2.4.2
Vulnerability Description	A denial-of-service vulnerability exists in OpenVPN. This vulnerability is due to an assertion in OpenVPN server that can be reached during the processing of a malicious packet. A remote, unauthenticated attacker can exploit this vulnerability to cause the OpenVPN server program to terminate, resulting in a denial-of-service condition.

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 R80 / R77 / R75

In the IPS tab, click Protections and find the OpenVPN P_CONTROL Denial of Service 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: SSL Enforcement Violation.
Attack Information: OpenVPN P_CONTROL Denial of Service