Check Point Advisories

NTPsec ntpd write_variables Denial of Service (CVE-2019-6445; CVE-2019-8936)

Vulnerability
Protection

Check Point Reference:	CPAI-2019-0245
Date Published:	24 Feb 2019
Severity:	Medium
Last Updated:	Monday 23 December, 2019
Source:	NTPsec
Industry Reference:	CVE-2019-6445 CVE-2019-8936
Protection Provided by:	Security Gateway R81, R80, R77, R75
Who is Vulnerable?	NTPsec ntpd prior to 1.1.3
Vulnerability Description	A denial-of-service vulnerability has been reported inN TPsec ntpd. The vulnerability is due to insufficient validation of certain data when parsing a variable in order to write. An attacker could exploit this vulnerability by enticing a target user to open a specially crafted link.

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 NTPsec ntpd write_variables 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: NTP Enforcement Violation.
Attack Information: NTPsec ntpd write_variables Denial of Service