[USN-5126-1] Bind vulnerability

========================================================================== Ubuntu Security Notice USN-5126-1 October 28, 2021
bind9 vulnerability ==========================================================================
A security issue affects these releases of Ubuntu and its derivatives:
– Ubuntu 21.10 – Ubuntu 21.04 – Ubuntu 20.04 LTS – Ubuntu 18.04 LTS
Bind could be made to consume resources if it received specially crafted network traffic.
Software Description: – bind9: Internet Domain Name Server
Kishore Kumar Kothapalli discovered that Bind incorrectly handled the lame cache when processing responses. A remote attacker could possibly use this issue to cause Bind to consume resources, resulting in a denial of service.
Update instructions:
The problem can be corrected by updating your system to the following package versions:
Ubuntu 21.10: bind9 1:9.16.15-1ubuntu1.1
Ubuntu 21.04: bind9 1:9.16.8-1ubuntu3.2
Ubuntu 20.04 LTS: bind9 1:9.16.1-0ubuntu2.9
Ubuntu 18.04 LTS: bind9 1:9.11.3+dfsg-1ubuntu1.16
In general, a standard system update will make all the necessary changes.
References: ubuntu.com/security/notices/USN-5126-1 CVE-2021-25219
Package Information: launchpad.net/ubuntu/+source/bind9/1:9.16.15-1ubuntu1.1 launchpad.net/ubuntu/+source/bind9/1:9.16.8-1ubuntu3.2 launchpad.net/ubuntu/+source/bind9/1:9.16.1-0ubuntu2.9 launchpad.net/ubuntu/+source/bind9/1:9.11.3+dfsg-1ubuntu1.16