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CVE-2020-26972

Published: 15 December 2020

The lifecycle of IPC Actors allows managed actors to outlive their manager actors; and the former must ensure that they are not attempting to use a dead actor they have a reference to. Such a check was omitted in WebGL, resulting in a use-after-free and a potentially exploitable crash. This vulnerability affects Firefox < 84.

Notes

AuthorNote
tyhicks
mozjs contains a copy of the SpiderMonkey JavaScript engine

Priority

Medium

Cvss 3 Severity Score

9.8

Score breakdown

Status

Package Release Status
firefox
Launchpad, Ubuntu, Debian
bionic
Released (84.0+build3-0ubuntu0.18.04.1)
focal
Released (84.0+build3-0ubuntu0.20.04.1)
hirsute
Released (84.0+build3-0ubuntu2)
groovy
Released (84.0+build3-0ubuntu0.20.10.1)
xenial
Released (84.0+build3-0ubuntu0.16.04.1)
jammy
Released (84.0+build3-0ubuntu2)
impish
Released (84.0+build3-0ubuntu2)
kinetic
Released (84.0+build3-0ubuntu2)
lunar
Released (84.0+build3-0ubuntu2)
trusty Does not exist

upstream
Released (84)
mantic
Released (84.0+build3-0ubuntu2)
mozjs78
Launchpad, Ubuntu, Debian
kinetic Ignored
(end of life, was needs-triage)
impish Ignored
(end of life)
bionic Does not exist

focal Does not exist

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

trusty Does not exist

upstream Needs triage

xenial Does not exist

mantic Does not exist

lunar Ignored
(end of life, was needs-triage)
mozjs38
Launchpad, Ubuntu, Debian
bionic Needs triage

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

trusty Does not exist

upstream Needs triage

xenial Does not exist

mantic Does not exist

mozjs52
Launchpad, Ubuntu, Debian
bionic Needs triage

focal Needs triage

groovy Ignored
(end of life)
hirsute Does not exist

impish Does not exist

jammy Does not exist

kinetic Does not exist

lunar Does not exist

trusty Does not exist

upstream Needs triage

xenial Does not exist

mantic Does not exist

mozjs60
Launchpad, Ubuntu, Debian
bionic Does not exist

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

trusty Does not exist

upstream Needs triage

xenial Does not exist

mantic Does not exist

mozjs68
Launchpad, Ubuntu, Debian
bionic Does not exist

focal Needs triage

groovy Ignored
(end of life)
hirsute Does not exist

impish Does not exist

jammy Does not exist

kinetic Does not exist

lunar Does not exist

trusty Does not exist

upstream Needs triage

xenial Does not exist

mantic Does not exist

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