========================================================================== Ubuntu Security Notice USN-5626-1 September 21, 2022 bind9 vulnerabilities ========================================================================== A security issue affects these releases of Ubuntu and its derivatives: - Ubuntu 22.04 LTS - Ubuntu 20.04 LTS - Ubuntu 18.04 LTS Summary: Several security issues were fixed in Bind. Software Description: - bind9: Internet Domain Name Server Details: Yehuda Afek, Anat Bremler-Barr, and Shani Stajnrod discovered that Bind incorrectly handled large delegations. A remote attacker could possibly use this issue to reduce performance, leading to a denial of service. (CVE-2022-2795) It was discovered that Bind incorrectly handled statistics requests. A remote attacker could possibly use this issue to obtain sensitive memory contents, or cause a denial of service. This issue only affected Ubuntu 22.04 LTS. (CVE-2022-2881) It was discovered that Bind incorrectly handled memory when processing certain Diffie-Hellman key exchanges. A remote attacker could use this issue to consume resources, leading to a denial of service. This issue only affected Ubuntu 22.04 LTS. (CVE-2022-2906) Maksym Odinintsev discovered that Bind incorrectly handled answers from cache when configured with a zero stale-answer-timeout. 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. (CVE-2022-3080) It was discovered that Bind incorrectly handled memory when processing ECDSA DNSSEC verification. A remote attacker could use this issue to consume resources, leading to a denial of service. This issue only affected Ubuntu 18.04 LTS and Ubuntu 20.04 LTS. (CVE-2022-38177) It was discovered that Bind incorrectly handled memory when processing EDDSA DNSSEC verification. A remote attacker could use this issue to consume resources, leading to a denial of service. (CVE-2022-38178) Update instructions: The problem can be corrected by updating your system to the following package versions: Ubuntu 22.04 LTS: bind9 1:9.18.1-1ubuntu1.2 Ubuntu 20.04 LTS: bind9 1:9.16.1-0ubuntu2.11 Ubuntu 18.04 LTS: bind9 1:9.11.3+dfsg-1ubuntu1.18 In general, a standard system update will make all the necessary changes. References: https://ubuntu.com/security/notices/USN-5626-1 CVE-2022-2795, CVE-2022-2881, CVE-2022-2906, CVE-2022-3080, CVE-2022-38177, CVE-2022-38178 Package Information: https://launchpad.net/ubuntu/+source/bind9/1:9.18.1-1ubuntu1.2 https://launchpad.net/ubuntu/+source/bind9/1:9.16.1-0ubuntu2.11 https://launchpad.net/ubuntu/+source/bind9/1:9.11.3+dfsg-1ubuntu1.18