Debian DLA-2396-1 : tigervnc security update

high Nessus Plugin ID 141246

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Synopsis

The remote Debian host is missing a security update.

Description

A vulnerability was discovered in tigernvc, a Virtual Network Computing client and server implementation. The viewer implementation mishandles TLS certificate exceptions, storing the certificates as authorities, meaning that the owner of a certificate could impersonate any server after a client had added an exception.

For Debian 9 stretch, this problem has been fixed in version 1.7.0+dfsg-7+deb9u2.

We recommend that you upgrade your tigervnc packages.

For the detailed security status of tigervnc please refer to its security tracker page at:
https://security-tracker.debian.org/tracker/tigervnc

NOTE: Tenable Network Security has extracted the preceding description block directly from the DLA security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.

Solution

Upgrade the affected packages.

Plugin Details

Severity: High

ID: 141246

File Name: debian_DLA-2396.nasl

Version: 1.4

Type: local

Agent: unix

Family: Debian Local Security Checks

Published: 10/7/2020

Updated: 10/19/2020

Supported Sensors: Agentless Assessment, Continuous Assessment, Frictionless Assessment Agent, Nessus Agent, 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: p-cpe:/a:debian:debian_linux:tigervnc-scraping-server, p-cpe:/a:debian:debian_linux:tigervnc-xorg-extension, cpe:/o:debian:debian_linux:9.0, p-cpe:/a:debian:debian_linux:tigervnc-common, p-cpe:/a:debian:debian_linux:tigervnc-standalone-server, p-cpe:/a:debian:debian_linux:tigervnc-viewer

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

Exploit Ease: No known exploits are available

Patch Publication Date: 10/6/2020

Vulnerability Publication Date: 9/27/2020

Reference Information

CVE: CVE-2020-26117

Detections

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