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CVE-2017-18922

Published: 30 June 2020

It was discovered that websockets.c in LibVNCServer prior to 0.9.12 did not properly decode certain WebSocket frames. A malicious attacker could exploit this by sending specially crafted WebSocket frames to a server, causing a heap-based buffer overflow.

Priority

Medium

Cvss 3 Severity Score

9.8

Score breakdown

Status

Package Release Status
libvncserver
Launchpad, Ubuntu, Debian
bionic
Released (0.9.11+dfsg-1ubuntu1.2)
eoan
Released (0.9.11+dfsg-1.3ubuntu0.1)
impish Not vulnerable
(0.9.13+dfsg-1)
focal
Released (0.9.12+dfsg-9ubuntu0.1)
groovy Not vulnerable
(0.9.13+dfsg-1)
jammy Not vulnerable
(0.9.13+dfsg-1)
kinetic Not vulnerable
(0.9.13+dfsg-1)
lunar Not vulnerable
(0.9.13+dfsg-1)
hirsute Not vulnerable
(0.9.13+dfsg-1)
trusty Does not exist

upstream Needs triage

xenial
Released (0.9.10+dfsg-3ubuntu0.16.04.4)
mantic Not vulnerable
(0.9.13+dfsg-1)
Patches:
upstream: https://github.com/LibVNC/libvncserver/commit/aac95a9dcf4bbba87b76c72706c3221a842ca433
veyon
Launchpad, Ubuntu, Debian
groovy Ignored
(end of life)
kinetic Ignored
(end of life, was needs-triage)
jammy Needs triage

impish Ignored
(end of life)
bionic Does not exist

eoan Ignored
(end of life)
focal Needs triage

hirsute Ignored
(end of life)
trusty Does not exist

upstream Needs triage

xenial Does not exist

mantic Needs triage

lunar Ignored
(end of life, was needs-triage)
x11vnc
Launchpad, Ubuntu, Debian
groovy Ignored
(end of life)
kinetic Ignored
(end of life, was needs-triage)
jammy Needs triage

xenial Needs triage

impish Ignored
(end of life)
bionic Needs triage

eoan Ignored
(end of life)
focal Needs triage

hirsute Ignored
(end of life)
trusty Needs triage

upstream Needs triage

mantic Needs triage

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

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