Check Point Advisories

DNSmasq Out-of-Bounds Write (CVE-2020-25682)

Check Point Reference: CPAI-2020-3597
Date Published: 20 Sep 2022
Severity: High
Last Updated: Tuesday 20 September, 2022
Industry Reference:CVE-2020-25682
Protection Provided by:

Security Gateway
R81, R80, R77, R75

Who is Vulnerable? DNSmasq prior to 2.83
Vulnerability Description An out-of-bounds write vulnerability has been discovered in dnsmasq, a DNS and DHCP server. The vulnerability occurs while extracting domain name of a RR record using the extract_name() function while sorting multiple RR records. A remote, unauthenticated attacker can run a server to send a specially crafted DNS reply to a 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 R81 / R80 / R77 / R75

  1. In the IPS tab, click Protections and find the DNSmasq Out-of-Bounds Write (CVE-2020-25682) protection using the Search tool and Edit the protection's settings.
  2. Install policy on all Security Gateways.

This protection's log will contain the following information:

Attack Name:  DNS Enforcement Violation.
Attack Information:  DNSmasq Out-of-Bounds Write (CVE-2020-25682)

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