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CVE-2018-20021

Published: 19 December 2018

LibVNC before commit c3115350eb8bb635d0fdb4dbbb0d0541f38ed19c contains a CWE-835: Infinite loop vulnerability in VNC client code. Vulnerability allows attacker to consume excessive amount of resources like CPU and RAM

Priority

Medium

Cvss 3 Severity Score

7.5

Score breakdown

Status

Package Release Status
italc
Launchpad, Ubuntu, Debian
bionic
Released (1:3.0.3+dfsg1-3ubuntu0.1)
focal Does not exist

groovy Does not exist

hirsute Does not exist

impish Does not exist

jammy Does not exist

kinetic Does not exist

lunar Does not exist

mantic Does not exist

noble Does not exist

trusty Does not exist
(trusty was needed)
upstream
Released (1:3.0.3+dfsg1-1+deb9u1, 1:2.0.2+dfsg1-2+deb8u1)
xenial
Released (1:2.0.2+dfsg1-4ubuntu0.1)
libvncserver
Launchpad, Ubuntu, Debian
bionic
Released (0.9.11+dfsg-1ubuntu1.1)
cosmic
Released (0.9.11+dfsg-1.1ubuntu0.1)
disco Not vulnerable
(0.9.11+dfsg-1.2)
focal Not vulnerable
(0.9.11+dfsg-1.2)
groovy Not vulnerable
(0.9.11+dfsg-1.2)
hirsute Not vulnerable
(0.9.11+dfsg-1.2)
impish Not vulnerable
(0.9.11+dfsg-1.2)
jammy Not vulnerable
(0.9.11+dfsg-1.2)
kinetic Not vulnerable
(0.9.11+dfsg-1.2)
lunar Not vulnerable
(0.9.11+dfsg-1.2)
mantic Not vulnerable
(0.9.11+dfsg-1.2)
noble Not vulnerable
(0.9.11+dfsg-1.2)
trusty
Released (0.9.9+dfsg-1ubuntu1.4)
upstream
Released (0.9.11+dfsg-1.2)
xenial
Released (0.9.10+dfsg-3ubuntu0.16.04.3)
Patches:
upstream: https://github.com/LibVNC/libvncserver/commit/c3115350eb8bb635d0fdb4dbbb0d0541f38ed19c
ssvnc
Launchpad, Ubuntu, Debian
bionic Needed

focal Not vulnerable
(1.0.29-5)
groovy Not vulnerable
(1.0.29-5)
hirsute Not vulnerable
(1.0.29-5)
impish Not vulnerable
(1.0.29-5)
jammy Not vulnerable
(1.0.29-5)
kinetic Not vulnerable
(1.0.29-5)
lunar Not vulnerable
(1.0.29-5)
mantic Not vulnerable
(1.0.29-5)
noble Not vulnerable
(1.0.29-5)
trusty Does not exist
(trusty was needed)
upstream
Released (1.0.29-2+deb8u1, 1.0.29-3+deb9u1, 1.0.29-4+deb10u1, 1.0.29-5)
xenial
Released (1.9.29-2+deb8u1build0.16.04.1)
tightvnc
Launchpad, Ubuntu, Debian
bionic Needs triage

focal Needs triage

groovy Ignored
(end of life)
hirsute Ignored
(end of life)
impish Ignored
(end of life)
jammy Needs triage

kinetic Ignored
(end of life, was needs-triage)
lunar Ignored
(end of life, was needs-triage)
mantic Needs triage

noble Needs triage

trusty
Released (1.3.9-6.5+deb8u1build0.14.04.1~esm1)
Available with Ubuntu Pro or Ubuntu Pro (Infra-only)
upstream
Released (1:1.3.9-6.5+deb8u1)
xenial Needs triage

x11vnc
Launchpad, Ubuntu, Debian
bionic Not vulnerable
(uses shared libvnc)
cosmic Ignored
(end of life)
disco Not vulnerable
(uses shared libvnc)
focal Not vulnerable
(uses shared libvnc)
groovy Not vulnerable
(uses shared libvnc)
hirsute Not vulnerable
(uses shared libvnc)
impish Not vulnerable
(uses shared libvnc)
jammy Not vulnerable
(uses shared libvnc)
kinetic Not vulnerable
(uses shared libvnc)
lunar Not vulnerable
(uses shared libvnc)
mantic Not vulnerable
(uses shared libvnc)
noble Not vulnerable
(uses shared libvnc)
trusty Not vulnerable
(uses shared libvnc)
upstream Needs triage

xenial Not vulnerable
(uses shared libvnc)

Severity score breakdown

Parameter Value
Base score 7.5
Attack vector Network
Attack complexity Low
Privileges required None
User interaction None
Scope Unchanged
Confidentiality None
Integrity impact None
Availability impact High
Vector CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H