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Ubuntu Security Notice USN-6164-2

Ubuntu Security Notice 6164-2 - USN-6164-1 fixed several vulnerabilities in c-ares. This update provides the corresponding update for Ubuntu 16.04 LTS and Ubuntu 18.04 LTS. Hannes Moesl discovered that c-ares incorrectly handled certain ipv6 addresses. An attacker could use this issue to cause c-ares to crash, resulting in a denial of service, or possibly execute arbitrary code.

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==========================================================================Ubuntu Security Notice USN-6164-2September 11, 2023c-ares vulnerabilities==========================================================================A security issue affects these releases of Ubuntu and its derivatives:- Ubuntu 18.04 LTS (Available with Ubuntu Pro)- Ubuntu 16.04 LTS (Available with Ubuntu Pro)Summary:Several security issues were fixed in c-ares.Software Description:- c-ares: library for asynchronous name resolutionDetails:USN-6164-1 fixed several vulnerabilities in c-ares. This update providesthe corresponding update for Ubuntu 16.04 LTS and Ubuntu 18.04 LTS.Original advisory details: Hannes Moesl discovered that c-ares incorrectly handled certain ipv6 addresses. An attacker could use this issue to cause c-ares to crash, resulting in a denial of service, or possibly execute arbitrary code. (CVE-2023-31130) Xiang Li discovered that c-ares incorrectly handled certain UDP packets. A remote attacker could possibly use this issue to cause c-res to crash, resulting in a denial of service. (CVE-2023-32067)Update instructions:The problem can be corrected by updating your system to the followingpackage versions:Ubuntu 18.04 LTS (Available with Ubuntu Pro):  libc-ares2                      1.14.0-1ubuntu0.2+esm1Ubuntu 16.04 LTS (Available with Ubuntu Pro):  libc-ares2                      1.10.0-3ubuntu0.2+esm2In general, a standard system update will make all the necessary changes.References:  https://ubuntu.com/security/notices/USN-6164-2  https://ubuntu.com/security/notices/USN-6164-1  CVE-2023-31130, CVE-2023-32067

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