Check Point Advisories

strongSwan x509 Plugin Denial of Service (CVE-2017-9023)

Vulnerability
Protection

Check Point Reference:	CPAI-2017-0573
Date Published:	17 Jul 2017
Severity:	Medium
Last Updated:	Wednesday 19 July, 2017
Source:	StrongSwan
Industry Reference:	CVE-2017-9023
Protection Provided by:	Security Gateway R81, R80, R77, R75
Who is Vulnerable?	strongSwan strongSwan prior to 5.5.3
Vulnerability Description	A denial-of-service vulnerability exists in strongSwan. The vulnerability is due to improper parsing of various X.509 certificate extensions using ASN.1 CHOICE and SEQUENCE types within the X.509 and ASN.1 parsers. A remote attacker can exploit this vulnerability by sending a crafted public key certificate to the target server.

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 strongSwan x509 Plugin 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: IKE Protection Violation.
Attack Information: strongSwan x509 Plugin Denial of Service