==========================================================================
Ubuntu Security Notice USN-5827-1
January 25, 2023

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

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

- Ubuntu 22.10
- Ubuntu 22.04 LTS
- Ubuntu 20.04 LTS

Summary:

Several security issues were fixed in Bind.

Software Description:
- bind9: Internet Domain Name Server

Details:

Rob Schulhof discovered that Bind incorrectly handled a large number of
UPDATE messages. A remote attacker could possibly use this issue to cause
Bind to consume resources, resulting in a denial of service.
(CVE-2022-3094)

Borja Marcos discovered that Bind incorrectly handled certain RRSIG
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 22.10. (CVE-2022-3736)

Maksym Odinintsev discovered that Bind incorrectly handled certain answers
from stale cache. 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 22.10. (CVE-2022-3924)

Update instructions:

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

Ubuntu 22.10:
   bind9                           1:9.18.4-2ubuntu2.1

Ubuntu 22.04 LTS:
   bind9                           1:9.18.1-1ubuntu1.3

Ubuntu 20.04 LTS:
   bind9                           1:9.16.1-0ubuntu2.12

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

References:
   https://ubuntu.com/security/notices/USN-5827-1
   CVE-2022-3094, CVE-2022-3736, CVE-2022-3924

Package Information:
   https://launchpad.net/ubuntu/+source/bind9/1:9.18.4-2ubuntu2.1
   https://launchpad.net/ubuntu/+source/bind9/1:9.18.1-1ubuntu1.3
   https://launchpad.net/ubuntu/+source/bind9/1:9.16.1-0ubuntu2.12