========================================================================== Ubuntu Security Notice USN-6665-1 February 28, 2024
unbound vulnerabilities ========================================================================== A security issue affects these releases of Ubuntu and its derivatives: - Ubuntu 23.10 - Ubuntu 22.04 LTS - Ubuntu 20.04 LTS Summary: Several security issues were fixed in Unbound. Software Description: - unbound: validating, recursive, caching DNS resolver Details: Elias Heftrig, Haya Schulmann, Niklas Vogel, and Michael Waidner discovered that Unbound incorrectly handled validating DNSSEC messages. A remote attacker could possibly use this issue to cause Unbound to consume resources, leading to a denial of service. (CVE-2023-50387) It was discovered that Unbound incorrectly handled preparing an NSEC3 closest encloser proof. A remote attacker could possibly use this issue to cause Unbound to consume resources, leading to a denial of service. (CVE-2023-50868) Update instructions: The problem can be corrected by updating your system to the following package versions: Ubuntu 23.10: libunbound8 1.17.1-2ubuntu0.1 unbound 1.17.1-2ubuntu0.1 Ubuntu 22.04 LTS: libunbound8 1.13.1-1ubuntu5.4 unbound 1.13.1-1ubuntu5.4 Ubuntu 20.04 LTS: libunbound8 1.9.4-2ubuntu1.5 unbound 1.9.4-2ubuntu1.5 In general, a standard system update will make all the necessary changes. References: https://ubuntu.com/security/notices/USN-6665-1 CVE-2023-50387, CVE-2023-50868 Package Information: https://launchpad.net/ubuntu/+source/unbound/1.17.1-2ubuntu0.1 https://launchpad.net/ubuntu/+source/unbound/1.13.1-1ubuntu5.4 https://launchpad.net/ubuntu/+source/unbound/1.9.4-2ubuntu1.5
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