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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