[USN-5126-2] Bind vulnerability

========================================================================== Ubuntu Security Notice USN-5126-2 October 28, 2021
bind9 vulnerability ==========================================================================
A security issue affects these releases of Ubuntu and its derivatives:
– Ubuntu 16.04 ESM – Ubuntu 14.04 ESM
Bind could be made to consume resources if it received specially crafted network traffic.
Software Description: – bind9: Internet Domain Name Server
USN-5126-1 fixed a vulnerability in Bind. This update provides the corresponding update for Ubuntu 14.04 ESM and Ubuntu 16.04 ESM.
Original advisory details:
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 16.04 ESM: bind9 1:9.10.3.dfsg.P4-8ubuntu1.19+esm1
Ubuntu 14.04 ESM: bind9 1:9.9.5.dfsg-3ubuntu0.19+esm5
In general, a standard system update will make all the necessary changes.
References: ubuntu.com/security/notices/USN-5126-2 ubuntu.com/security/notices/USN-5126-1 CVE-2021-25219