Ubuntu 12.04 LTS / 14.04 LTS / 16.04 LTS / 16.10 : c-ares vulnerability (USN-3143-1)

High Nessus Plugin ID 95428


The remote Ubuntu host is missing a security-related patch.


Gzob Qq discovered that c-ares incorrectly handled certain hostnames.
A remote attacker could use this issue to cause applications using c-ares to crash, resulting in a denial of service, or possibly execute arbitrary code.

Note that Tenable Network Security has extracted the preceding description block directly from the Ubuntu security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.


Update the affected libc-ares2 package.

Plugin Details

Severity: High

ID: 95428

File Name: ubuntu_USN-3143-1.nasl

Version: $Revision: 3.2 $

Type: local

Agent: unix

Published: 2016/12/01

Modified: 2016/12/05

Dependencies: 12634

Risk Information

Risk Factor: High


Base Score: 7.5

Temporal Score: 6.2

Vector: CVSS2#AV:N/AC:L/Au:N/C:P/I:P/A:P

Temporal Vector: CVSS2#E:F/RL:OF/RC:ND


Base Score: 9.8

Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Vulnerability Information

CPE: p-cpe:/a:canonical:ubuntu_linux:libc-ares2, cpe:/o:canonical:ubuntu_linux:12.04:-:lts, cpe:/o:canonical:ubuntu_linux:14.04, cpe:/o:canonical:ubuntu_linux:16.04, cpe:/o:canonical:ubuntu_linux:16.10

Required KB Items: Host/cpu, Host/Ubuntu, Host/Ubuntu/release, Host/Debian/dpkg-l

Exploit Available: true

Exploit Ease: Exploits are available

Patch Publication Date: 2016/11/30

Reference Information

CVE: CVE-2016-5180

OSVDB: 144918

USN: 3143-1