GLSA-201701-28 : c-ares: Heap-based buffer overflow

High Nessus Plugin ID 96422


The remote Gentoo host is missing one or more security-related patches.


The remote host is affected by the vulnerability described in GLSA-201701-28 (c-ares: Heap-based buffer overflow)

A hostname with an escaped trailing dot (such as “hello\\.”) would have its size calculated incorrectly leading to a single byte written beyond the end of a buffer on the heap.
Impact :

A remote attacker, able to provide a specially crafted hostname to an application using c-ares, could potentially cause a Denial of Service condition.
Workaround :

There is no known workaround at this time.


All c-ares users should upgrade to the latest version:
# emerge --sync # emerge --ask --oneshot --verbose '>=net-dns/c-ares-1.12.0'

See Also

Plugin Details

Severity: High

ID: 96422

File Name: gentoo_GLSA-201701-28.nasl

Version: $Revision: 3.1 $

Type: local

Published: 2017/01/12

Modified: 2017/01/12

Dependencies: 12634

Risk Information

Risk Factor: High


Base Score: 7.5

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


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:gentoo:linux:c-ares, cpe:/o:gentoo:linux

Required KB Items: Host/local_checks_enabled, Host/Gentoo/release, Host/Gentoo/qpkg-list

Patch Publication Date: 2017/01/11

Reference Information

CVE: CVE-2016-5180

GLSA: 201701-28