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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.
==========================================================================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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c-ares is an asynchronous resolver library. ares_inet_net_pton() is vulnerable to a buffer underflow for certain ipv6 addresses, in particular "0::00:00:00/2" was found to cause an issue. C-ares only uses this function internally for configuration purposes which would require an administrator to configure such an address via ares_set_sortlist(). However, users may externally use ares_inet_net_pton() for other purposes and thus be vulnerable to more severe issues. This issue has been fixed in 1.19.1.