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Ubuntu 14.04 LTS / 16.04 LTS : LibVNCServer vulnerabilities (USN-3171-1)

critical Nessus Plugin ID 96445

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Synopsis

The remote Ubuntu host is missing one or more security updates.

Description

The remote Ubuntu 14.04 LTS / 16.04 LTS host has packages installed that are affected by multiple vulnerabilities as referenced in the USN-3171-1 advisory.

 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)

Tenable has extracted the preceding description block directly from the Ubuntu security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

Solution

Update the affected packages.

See Also

https://ubuntu.com/security/notices/USN-3171-1

Plugin Details

Severity: Critical

ID: 96445

File Name: ubuntu_USN-3171-1.nasl

Version: 3.9

Type: local

Agent: unix

Published: 1/12/2017

Updated: 8/27/2024

Supported Sensors: Agentless Assessment, Continuous Assessment, Frictionless Assessment Agent, Frictionless Assessment AWS, Frictionless Assessment Azure, Nessus Agent, Nessus

Risk Information

VPR

Risk Factor: Medium

Score: 5.9

CVSS v2

Risk Factor: High

Base Score: 7.5

Temporal Score: 5.5

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

CVSS Score Source: CVE-2016-9942

CVSS v3

Risk Factor: Critical

Base Score: 9.8

Temporal Score: 8.5

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

Temporal Vector: CVSS:3.0/E:U/RL:O/RC:C

Vulnerability Information

CPE: cpe:/o:canonical:ubuntu_linux:14.04:-:lts, cpe:/o:canonical:ubuntu_linux:16.04:-:lts, p-cpe:/a:canonical:ubuntu_linux:libvncserver0, p-cpe:/a:canonical:ubuntu_linux:libvncserver-dev, p-cpe:/a:canonical:ubuntu_linux:libvncserver1, p-cpe:/a:canonical:ubuntu_linux:linuxvnc, p-cpe:/a:canonical:ubuntu_linux:libvncserver-config, p-cpe:/a:canonical:ubuntu_linux:libvncclient1

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

Exploit Ease: No known exploits are available

Patch Publication Date: 1/11/2017

Vulnerability Publication Date: 12/31/2016

Reference Information

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

USN: 3171-1