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)
	focal	Released (85.0+build1-0ubuntu0.20.04.1)
	groovy	Released (85.0+build1-0ubuntu0.20.10.1)
	hirsute	Released (85.0+build1-0ubuntu1)
	impish	Released (85.0+build1-0ubuntu1)
	jammy	Released (85.0+build1-0ubuntu1)
	kinetic	Released (85.0+build1-0ubuntu1)
	precise	Does not exist
	trusty	Does not exist
	upstream	Released (85)
	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
	precise	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
	precise	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 (reached end-of-life)
	hirsute	Does not exist
	impish	Does not exist
	jammy	Does not exist
	kinetic	Does not exist
	precise	Does not exist
	trusty	Does not exist
	upstream	Needs triage
	xenial	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
	precise	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 (reached end-of-life)
	hirsute	Does not exist
	impish	Does not exist
	jammy	Does not exist
	kinetic	Does not exist
	precise	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 (reached end-of-life)
	hirsute	Ignored (reached end-of-life)
	impish	Ignored (reached end-of-life)
	jammy	Needs triage
	kinetic	Needs triage
	precise	Does not exist
	trusty	Does not exist
	upstream	Needs triage
	xenial	Does not exist
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)
	precise	Does not exist
	trusty	Does not exist
	upstream	Released (78.7)
	xenial	Needed

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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