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.
{ "availability": "Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro", "binaries": [ { "binary_version": "1.10.0-3ubuntu0.2+esm1", "binary_name": "libc-ares-dev" }, { "binary_version": "1.10.0-3ubuntu0.2+esm1", "binary_name": "libc-ares2" }, { "binary_version": "1.10.0-3ubuntu0.2+esm1", "binary_name": "libc-ares2-dbgsym" } ] }