Debian dla-3125 : libvncclient1 - security update

high Nessus Plugin ID 165593

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Synopsis

The remote Debian host is missing one or more security-related updates.

Description

The remote Debian 10 host has packages installed that are affected by multiple vulnerabilities as referenced in the dla-3125 advisory.

- ------------------------------------------------------------------------- Debian LTS Advisory DLA-3125-1 [email protected] https://www.debian.org/lts/security/ Thorsten Alteholz September 30, 2022 https://wiki.debian.org/LTS
- -------------------------------------------------------------------------

Package : libvncserver Version : 0.9.11+dfsg-1.3+deb10u5 CVE ID : CVE-2020-25708 CVE-2020-29260

Two issues have been found in libvncserver, a library to write one's own VNC server.

CVE-2020-25708

Due to some missing checks, a divide by zero could happen, which could result in a denial of service.

CVE-2020-29260

Due to a memory leak in function rfbClientCleanup() a remote attacker might be able to cause a denial of service.

For Debian 10 buster, these problems have been fixed in version 0.9.11+dfsg-1.3+deb10u5.

We recommend that you upgrade your libvncserver packages.

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

Further information about Debian LTS security advisories, how to apply these updates to your system and frequently asked questions can be found at: https://wiki.debian.org/LTS

Tenable has extracted the preceding description block directly from the Debian 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

Upgrade the libvncclient1 packages.

Plugin Details

Severity: High

ID: 165593

File Name: debian_DLA-3125.nasl

Version: 1.4

Type: local

Agent: unix

Family: Debian Local Security Checks

Published: 9/30/2022

Updated: 1/22/2025

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

Risk Information

VPR

Risk Factor: Medium

Score: 4.4

CVSS v2

Risk Factor: Medium

Base Score: 5

Temporal Score: 3.9

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

CVSS Score Source: CVE-2020-25708

CVSS v3

Risk Factor: High

Base Score: 7.5

Temporal Score: 6.7

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

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

CVSS Score Source: CVE-2020-29260

Vulnerability Information

CPE: cpe:/o:debian:debian_linux:10.0, p-cpe:/a:debian:debian_linux:libvncserver1-dbg, p-cpe:/a:debian:debian_linux:libvncserver-config, p-cpe:/a:debian:debian_linux:libvncclient1, p-cpe:/a:debian:debian_linux:libvncserver1, p-cpe:/a:debian:debian_linux:libvncclient1-dbg, p-cpe:/a:debian:debian_linux:libvncserver-dev

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

Exploit Available: true

Exploit Ease: Exploits are available

Patch Publication Date: 9/29/2022

Vulnerability Publication Date: 11/27/2020

Reference Information

CVE: CVE-2020-25708, CVE-2020-29260

Detections

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