Check Point Advisories

Dnsmasq DHCPv6 Stack Buffer Overflow Remote Code Execution (CVE-2017-14493)

Vulnerability
Protection

Check Point Reference:	CPAI-2017-0843
Date Published:	17 Oct 2017
Severity:	Critical
Last Updated:	Thursday 19 October, 2017
Source:	DNSmasq
Industry Reference:	CVE-2017-14493
Protection Provided by:	Security Gateway R81, R80, R77, R75
Who is Vulnerable?	DNSmasq/Mikrotik DNSmasq prior to 2.78
Vulnerability Description	A stack buffer overflow vulnerability exists over Dnsmasq. This is due to the way Dnsmasq handles TTL requests. A successful attack could lead to an arbitrary code execution.

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 Dnsmasq DHCPv6 Stack Buffer Overflow Remote Code Execution (CVE-2017-14493) 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: DNS Enforcement Violation.
Attack Information: Dnsmasq DHCPv6 Stack Buffer Overflow Remote Code Execution (CVE-2017-14493)