========================================================================== Ubuntu Security Notice USN-5034-2 August 10, 2021
c-ares vulnerability ========================================================================== A security issue affects these releases of Ubuntu and its derivatives: - Ubuntu 16.04 ESM Summary: c-ares could be made to return wrong domains. Software Description: - c-ares: library for asynchronous name resolution Details: USN-5034-1 fixed a vulnerability in c-ares. This update provides the corresponding update for Ubuntu 16.04 ESM. Original advisory details: Philipp Jeitner and Haya Shulman discovered that c-ares incorrectly validated certain hostnames returned by DNS servers. A remote attacker could possibly use this issue to perform Domain Hijacking attacks. Update instructions: The problem can be corrected by updating your system to the following package versions: Ubuntu 16.04 ESM: libc-ares2 1.10.0-3ubuntu0.2+esm1 In general, a standard system update will make all the necessary changes. References: https://ubuntu.com/security/notices/USN-5034-2 https://ubuntu.com/security/notices/USN-5034-1 CVE-2021-3672
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