Ubuntu 12.04 LTS / 14.04 LTS / 16.04 LTS / 16.10 : libvncserver vulnerabilities (USN-3171-1)

High Nessus Plugin ID 96445


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


Josef Gajdusek discovered that the LibVNCServer client library incorrectly handled certain FrameBufferUpdate messages. If a user were tricked into connecting to a malicious server, an attacker could use this issue to cause a denial of service, or possibly execute arbitrary code. (CVE-2016-9941, CVE-2016-9942).

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 libvncclient1, libvncserver0 and / or libvncserver1 packages.

Plugin Details

Severity: High

ID: 96445

File Name: ubuntu_USN-3171-1.nasl

Version: $Revision: 3.2 $

Type: local

Agent: unix

Published: 2017/01/12

Modified: 2017/01/16

Dependencies: 12634

Risk Information

Risk Factor: High


Base Score: 7.5

Temporal Score: 5.9

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

Temporal Vector: CVSS2#E:POC/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:libvncclient1, p-cpe:/a:canonical:ubuntu_linux:libvncserver0, p-cpe:/a:canonical:ubuntu_linux:libvncserver1, 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: 2017/01/11

Reference Information

CVE: CVE-2016-9941, CVE-2016-9942

OSVDB: 149427, 149428

USN: 3171-1