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Ubuntu 20.04 ESM : TigerVNC vulnerability (USN-5965-1)

high Nessus Plugin ID 173051

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Synopsis

The remote Ubuntu host is missing a security update.

Description

The remote Ubuntu 20.04 ESM host has packages installed that are affected by a vulnerability as referenced in the USN-5965-1 advisory.

 - In rfb/CSecurityTLS.cxx and rfb/CSecurityTLS.java in TigerVNC before 1.11.0, viewers mishandle TLS certificate exceptions. They store the certificates as authorities, meaning that the owner of a certificate could impersonate any server after a client had added an exception. (CVE-2020-26117)

Note that Nessus has not tested for this issue 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-5965-1

Plugin Details

Severity: High

ID: 173051

File Name: ubuntu_USN-5965-1.nasl

Version: 1.1

Type: local

Agent: unix

Published: 3/21/2023

Updated: 10/20/2023

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

Risk Information

VPR

Risk Factor: Medium

Score: 5.2

CVSS v2

Risk Factor: Medium

Base Score: 5.8

Temporal Score: 4.3

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

CVSS Score Source: CVE-2020-26117

CVSS v3

Risk Factor: High

Base Score: 8.1

Temporal Score: 7.1

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

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

Vulnerability Information

CPE: cpe:/o:canonical:ubuntu_linux:20.04:-:esm, p-cpe:/a:canonical:ubuntu_linux:tigervnc-common, p-cpe:/a:canonical:ubuntu_linux:tigervnc-scraping-server, p-cpe:/a:canonical:ubuntu_linux:tigervnc-standalone-server, p-cpe:/a:canonical:ubuntu_linux:tigervnc-viewer, p-cpe:/a:canonical:ubuntu_linux:tigervnc-xorg-extension

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

Exploit Ease: No known exploits are available

Patch Publication Date: 3/21/2023

Vulnerability Publication Date: 9/27/2020

Reference Information

CVE: CVE-2020-26117

USN: 5965-1