CVE-2021-23954

Published: 26 January 2021

Using the new logical assignment operators in a JavaScript switch statement could have caused a type confusion, leading to a memory corruption and a potentially exploitable crash. This vulnerability affects Firefox < 85, Thunderbird < 78.7, and Firefox ESR < 78.7.

Notes

Author	Note
tyhicks	mozjs contains a copy of the SpiderMonkey JavaScript engine

Priority

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)
	hirsute	Released (85.0+build1-0ubuntu1)
	impish	Released (85.0+build1-0ubuntu1)
	jammy	Released (85.0+build1-0ubuntu1)
	kinetic	Released (85.0+build1-0ubuntu1)
	lunar	Released (85.0+build1-0ubuntu1)
	trusty	Does not exist
	upstream	Released (85)
	focal	Released (85.0+build1-0ubuntu0.20.04.1)
	groovy	Released (85.0+build1-0ubuntu0.20.10.1)
	xenial	Released (85.0+build1-0ubuntu0.16.04.1)
firefox-esr 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	Released (78.7)
	xenial	Does not exist
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
mozjs52 Launchpad, Ubuntu, Debian	bionic	Needs triage
	focal	Needs triage
	groovy	Ignored (end of life)
	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
	hirsute	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
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
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
	lunar	Needs triage
	trusty	Does not exist
	upstream	Needs triage
	xenial	Does not exist
	impish	Ignored (end of life)
	kinetic	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)
	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)
	groovy	Released (1:78.7.1+build1-0ubuntu0.20.10.4)
	hirsute	Released (1:78.7.0+build2-0ubuntu1)
	upstream	Released (78.7)

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

References

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