[USN-4924-1] Dnsmasq vulnerabilities

========================================================================== Ubuntu Security Notice USN-4924-1 April 22, 2021
dnsmasq vulnerabilities ==========================================================================
A security issue affects these releases of Ubuntu and its derivatives:
– Ubuntu 16.04 LTS
Summary:
Several security issues were fixed in Dnsmasq.
Software Description: – 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 LTS: dnsmasq 2.75-1ubuntu0.16.04.10 dnsmasq-base 2.75-1ubuntu0.16.04.10 dnsmasq-utils 2.75-1ubuntu0.16.04.10
After a standard system update you need to reboot your computer to make all the necessary changes.
References: ubuntu.com/security/notices/USN-4924-1 CVE-2017-15107, CVE-2019-14513
Package Information: launchpad.net/ubuntu/+source/dnsmasq/2.75-1ubuntu0.16.04.10