========================================================================== Ubuntu Security Notice USN-5332-1 March 17, 2022 bind9 vulnerabilities ========================================================================== A security issue affects these releases of Ubuntu and its derivatives: - Ubuntu 21.10 - Ubuntu 20.04 LTS - Ubuntu 18.04 LTS Summary: Several security issues were fixed in Bind. Software Description: - bind9: Internet Domain Name Server Details: Xiang Li, Baojun Liu, Chaoyi Lu, and Changgen Zou discovered that Bind incorrectly handled certain bogus NS records when using forwarders. A remote attacker could possibly use this issue to manipulate cache results. (CVE-2021-25220) It was discovered that Bind incorrectly handled certain crafted TCP streams. A remote attacker could possibly use this issue to cause Bind to consume resources, leading to a denial of service. This issue only affected Ubuntu 21.10. (CVE-2022-0396) Update instructions: The problem can be corrected by updating your system to the following package versions: Ubuntu 21.10: bind9 1:9.16.15-1ubuntu1.2 Ubuntu 20.04 LTS: bind9 1:9.16.1-0ubuntu2.10 Ubuntu 18.04 LTS: bind9 1:9.11.3+dfsg-1ubuntu1.17 In general, a standard system update will make all the necessary changes. References: https://ubuntu.com/security/notices/USN-5332-1 CVE-2021-25220, CVE-2022-0396 Package Information: https://launchpad.net/ubuntu/+source/bind9/1:9.16.15-1ubuntu1.2 https://launchpad.net/ubuntu/+source/bind9/1:9.16.1-0ubuntu2.10 https://launchpad.net/ubuntu/+source/bind9/1:9.11.3+dfsg-1ubuntu1.17