USN-4924-1: Dnsmasq vulnerabilities

Releases

• Ubuntu 16.04 ESM

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

• 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

• CVE-2019-14513
• CVE-2017-15107