==========================================================================
Ubuntu Security Notice USN-6390-1
September 20, 2023

bind9 vulnerabilities
==========================================================================

A security issue affects these releases of Ubuntu and its derivatives:

- Ubuntu 23.04
- Ubuntu 22.04 LTS
- Ubuntu 20.04 LTS

Summary:

Bind could be made to crash if it received specially crafted network
traffic.

Software Description:
- bind9: Internet Domain Name Server

Details:

It was discovered that Bind incorrectly handled certain control channel
messages. A remote attacker with access to the control channel could
possibly use this issue to cause Bind to crash, resulting in a denial of
service. (CVE-2023-3341)

Robert Story discovered that Bind incorrectly handled certain DNS-over-TLS
queries. A remote attacker could possibly use this issue to cause Bind to
crash, resulting in a denial of service. This issue only affected Ubuntu
22.04 LTS, and Ubuntu 23.04. (CVE-2023-4236)

Update instructions:

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

Ubuntu 23.04:
   bind9                           1:9.18.12-1ubuntu1.2

Ubuntu 22.04 LTS:
   bind9                           1:9.18.12-0ubuntu0.22.04.3

Ubuntu 20.04 LTS:
   bind9                           1:9.16.1-0ubuntu2.16

In general, a standard system update will make all the necessary changes.

References:
   https://ubuntu.com/security/notices/USN-6390-1
   CVE-2023-3341, CVE-2023-4236

Package Information:
   https://launchpad.net/ubuntu/+source/bind9/1:9.18.12-1ubuntu1.2
   https://launchpad.net/ubuntu/+source/bind9/1:9.18.12-0ubuntu0.22.04.3
   https://launchpad.net/ubuntu/+source/bind9/1:9.16.1-0ubuntu2.16