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CVE-2020-26950

Published: 10 November 2020

In certain circumstances, the MCallGetProperty opcode can be emitted with unmet assumptions resulting in an exploitable use-after-free condition. This vulnerability affects Firefox < 82.0.3, Firefox ESR < 78.4.1, and Thunderbird < 78.4.2.

Notes

AuthorNote
tyhicks
mozjs contains a copy of the SpiderMonkey JavaScript engine

Priority

High

Cvss 3 Severity Score

8.8

Score breakdown

Status

Package Release Status
firefox
Launchpad, Ubuntu, Debian
trusty Does not exist

upstream
Released (82.0.3)
bionic
Released (82.0.3+build1-0ubuntu0.18.04.1)
focal
Released (82.0.3+build1-0ubuntu0.20.04.1)
groovy
Released (82.0.3+build1-0ubuntu0.20.10.1)
xenial
Released (82.0.3+build1-0ubuntu0.16.04.1)
impish
Released (82.0.3+build1-0ubuntu1)
hirsute
Released (82.0.3+build1-0ubuntu1)
jammy
Released (82.0.3+build1-0ubuntu1)
lunar
Released (82.0.3+build1-0ubuntu1)
kinetic
Released (82.0.3+build1-0ubuntu1)
mantic
Released (82.0.3+build1-0ubuntu1)
thunderbird
Launchpad, Ubuntu, Debian
trusty Does not exist

upstream
Released (78.4.2)
bionic
Released (1:78.8.1+build1-0ubuntu0.18.04.1)
focal
Released (1:78.7.1+build1-0ubuntu0.20.04.1)
hirsute
Released (1:78.4.3+build1-0ubuntu1)
groovy
Released (1:78.5.0+build3-0ubuntu0.20.10.1)
lunar
Released (1:78.4.3+build1-0ubuntu1)
xenial Ignored
(end of standard support, was needs-triage)
impish
Released (1:78.4.3+build1-0ubuntu1)
jammy
Released (1:78.4.3+build1-0ubuntu1)
kinetic
Released (1:78.4.3+build1-0ubuntu1)
mantic
Released (1:78.4.3+build1-0ubuntu1)
mozjs38
Launchpad, Ubuntu, Debian
bionic Needs triage

focal Does not exist

trusty Does not exist

upstream Needs triage

xenial Does not exist

groovy Does not exist

hirsute Does not exist

impish Does not exist

jammy Does not exist

lunar Does not exist

kinetic Does not exist

mantic Does not exist

mozjs52
Launchpad, Ubuntu, Debian
bionic Needs triage

focal Needs triage

groovy Ignored
(end of life)
trusty Does not exist

upstream Needs triage

xenial Does not exist

impish Does not exist

hirsute Does not exist

lunar Does not exist

jammy Does not exist

kinetic 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

trusty Does not exist

upstream Needs triage

xenial Does not exist

impish Does not exist

lunar Does not exist

jammy Does not exist

kinetic Does not exist

mantic Does not exist

mozjs68
Launchpad, Ubuntu, Debian
groovy Ignored
(end of life)
trusty Does not exist

upstream Needs triage

bionic Does not exist

focal Needs triage

hirsute Does not exist

xenial Does not exist

lunar Does not exist

impish Does not exist

jammy Does not exist

kinetic Does not exist

mantic Does not exist

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