USN-4924-1: Dnsmasq vulnerabilities

22 April 2021

Several security issues were fixed in Dnsmasq.

Releases

Packages

  • dnsmasq - Small caching DNS proxy and DHCP/TFTP server

Details

It was discovered that Dnsmasq incorrectly handled certain wildcard
synthesized NSEC records. A remote attacker could possibly use this issue
to prove the non-existence of hostnames that actually exist.
(CVE-2017-15107)

It was discovered that Dnsmasq incorrectly handled certain large DNS
packets. A remote attacker could possibly use this issue to cause Dnsmasq
to crash, resulting in a denial of service. (CVE-2019-14513)

Update instructions

The problem can be corrected by updating your system to the following package versions:

Ubuntu 16.04

After a standard system update you need to reboot your computer to make all
the necessary changes.