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CVE-2021-23960

Published: 26 January 2021

Performing garbage collection on re-declared JavaScript variables resulted in a user-after-poison, and a potentially exploitable crash. This vulnerability affects Firefox < 85, Thunderbird < 78.7, and Firefox ESR < 78.7.

Notes

AuthorNote
tyhicks
mozjs contains a copy of the SpiderMonkey JavaScript engine

Priority

Medium

Cvss 3 Severity Score

8.8

Score breakdown

Status

Package Release Status
firefox
Launchpad, Ubuntu, Debian
bionic
Released (85.0+build1-0ubuntu0.18.04.1)
focal
Released (85.0+build1-0ubuntu0.20.04.1)
groovy
Released (85.0+build1-0ubuntu0.20.10.1)
impish
Released (85.0+build1-0ubuntu1)
jammy
Released (85.0+build1-0ubuntu1)
kinetic
Released (85.0+build1-0ubuntu1)
lunar
Released (85.0+build1-0ubuntu1)
xenial
Released (85.0+build1-0ubuntu0.16.04.1)
hirsute
Released (85.0+build1-0ubuntu1)
trusty Does not exist

upstream
Released (85)
mantic
Released (85.0+build1-0ubuntu1)
firefox-esr
Launchpad, Ubuntu, Debian
jammy Does not exist

kinetic Does not exist

lunar Does not exist

impish Does not exist

bionic Does not exist

focal Does not exist

groovy Does not exist

hirsute Does not exist

trusty Does not exist

upstream
Released (78.7)
xenial Does not exist

mantic Does not exist

mozjs38
Launchpad, Ubuntu, Debian
groovy Does not exist

hirsute 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

impish Does not exist

bionic Needs triage

focal Does not exist

mantic Does not exist

mozjs52
Launchpad, Ubuntu, Debian
bionic Needs triage

focal Needs triage

groovy Ignored
(end of life)
jammy Does not exist

kinetic Does not exist

lunar Does not exist

trusty Does not exist

upstream Needs triage

xenial Does not exist

impish Does not exist

hirsute 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

jammy Does not exist

kinetic Does not exist

lunar Does not exist

trusty Does not exist

upstream Needs triage

xenial Does not exist

impish 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

jammy Does not exist

kinetic Does not exist

lunar Does not exist

trusty Does not exist

upstream Needs triage

xenial Does not exist

impish Does not exist

mantic Does not exist

mozjs78
Launchpad, Ubuntu, Debian
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

kinetic Ignored
(end of life, was needs-triage)
impish Ignored
(end of life)
mantic Does not exist

lunar Ignored
(end of life, was needs-triage)
thunderbird
Launchpad, Ubuntu, Debian
bionic
Released (1:78.8.1+build1-0ubuntu0.18.04.1)
focal
Released (1:78.7.1+build1-0ubuntu0.20.04.1)
groovy
Released (1:78.7.1+build1-0ubuntu0.20.10.4)
hirsute
Released (1:78.7.0+build2-0ubuntu1)
impish
Released (1:78.7.0+build2-0ubuntu1)
jammy
Released (1:78.7.0+build2-0ubuntu1)
kinetic
Released (1:78.7.0+build2-0ubuntu1)
lunar
Released (1:78.7.0+build2-0ubuntu1)
trusty Does not exist

xenial Ignored
(end of standard support, was needed)
upstream
Released (78.7)
mantic
Released (1:78.7.0+build2-0ubuntu1)

Severity score breakdown

Parameter Value
Base score 8.8
Attack vector Network
Attack complexity Low
Privileges required None
User interaction Required
Scope Unchanged
Confidentiality High
Integrity impact High
Availability impact High
Vector CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H