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CVE-2018-20748

Published: 30 January 2019

LibVNC before 0.9.12 contains multiple heap out-of-bounds write vulnerabilities in libvncclient/rfbproto.c. The fix for CVE-2018-20019 was incomplete.

Notes

AuthorNote
mdeslaur
Further fixes for CVE-2018-20019

Priority

Medium

Cvss 3 Severity Score

9.8

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

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)
hirsute Does not exist

jammy Does not exist

kinetic Does not exist

lunar Does not exist

impish Does not exist

mantic Does not exist

libvncserver
Launchpad, Ubuntu, Debian
focal Not vulnerable
(0.9.11+dfsg-1.3)
bionic
Released (0.9.11+dfsg-1ubuntu1.1)
cosmic
Released (0.9.11+dfsg-1.1ubuntu0.1)
disco Not vulnerable
(0.9.11+dfsg-1.3)
groovy Not vulnerable
(0.9.11+dfsg-1.3)
trusty
Released (0.9.9+dfsg-1ubuntu1.4)
upstream
Released (0.9.11+dfsg-1.3)
xenial
Released (0.9.10+dfsg-3ubuntu0.16.04.3)
hirsute Not vulnerable
(0.9.11+dfsg-1.3)
jammy Not vulnerable
(0.9.11+dfsg-1.3)
kinetic Not vulnerable
(0.9.11+dfsg-1.3)
lunar Not vulnerable
(0.9.11+dfsg-1.3)
impish Not vulnerable
(0.9.11+dfsg-1.3)
mantic Not vulnerable
(0.9.11+dfsg-1.3)
Patches:
upstream: https://github.com/LibVNC/libvncserver/commit/c5ba3fee85a7ecbbca1df5ffd46d32b92757bc2a
upstream: https://github.com/LibVNC/libvncserver/commit/e34bcbb759ca5bef85809967a268fdf214c1ad2c
upstream: https://github.com/LibVNC/libvncserver/commit/c2c4b81e6cb3b485fb1ec7ba9e7defeb889f6ba7
upstream: https://github.com/LibVNC/libvncserver/commit/a64c3b37af9a6c8f8009d7516874b8d266b42bae
tightvnc
Launchpad, Ubuntu, Debian
bionic Needs triage

focal Needs triage

groovy Ignored
(end of life)
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

kinetic Ignored
(end of life, was needs-triage)
hirsute Ignored
(end of life)
jammy Needs triage

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

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

xenial Not vulnerable
(uses shared libvnc)
mantic Not vulnerable
(uses shared libvnc)

Severity score breakdown

Parameter Value
Base score 9.8
Attack vector Network
Attack complexity Low
Privileges required None
User interaction None
Scope Unchanged
Confidentiality High
Integrity impact High
Availability impact High
Vector CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H