Ubuntu 14.04 LTS / 16.04 LTS / 18.04 LTS / 18.10 : LibVNCServer vulnerabilities (USN-3877-1)

critical Nessus Plugin ID 121541

Synopsis

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

Description

It was discovered that LibVNCServer incorrectly handled certain operations. A remote attacker able to connect to applications using LibVNCServer could possibly use this issue to obtain sensitive information, cause a denial of service, or 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.

Solution

Update the affected libvncclient1, libvncserver0 and / or libvncserver1 packages.

See Also

https://usn.ubuntu.com/3877-1/

Plugin Details

Severity: Critical

ID: 121541

File Name: ubuntu_USN-3877-1.nasl

Version: 1.4

Type: local

Agent: unix

Published: 2/1/2019

Updated: 9/17/2020

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

Risk Information

CVSS Score Source: CVE-2018-20750

VPR

Risk Factor: Medium

Score: 5.9

CVSS v2

Risk Factor: High

Base Score: 7.5

Temporal Score: 5.5

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

Temporal Vector: E:U/RL:OF/RC:C

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: E:U/RL:O/RC:C

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:14.04, cpe:/o:canonical:ubuntu_linux:16.04, cpe:/o:canonical:ubuntu_linux:18.04:-:lts, cpe:/o:canonical:ubuntu_linux:18.10

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

Exploit Ease: No known exploits are available

Patch Publication Date: 1/31/2019

Vulnerability Publication Date: 12/19/2018

Reference Information

CVE: CVE-2018-15126, CVE-2018-15127, CVE-2018-20019, CVE-2018-20020, CVE-2018-20021, CVE-2018-20022, CVE-2018-20023, CVE-2018-20024, CVE-2018-20748, CVE-2018-20749, CVE-2018-20750, CVE-2018-6307

USN: 3877-1