CVE-2020-26973

Published: 15 December 2020

Certain input to the CSS Sanitizer confused it, resulting in incorrect components being removed. This could have been used as a sanitizer bypass. This vulnerability affects Firefox < 84, Thunderbird < 78.6, and Firefox ESR < 78.6.

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	hirsute	Released (84.0+build3-0ubuntu2)
	bionic	Released (84.0+build3-0ubuntu0.18.04.1)
	focal	Released (84.0+build3-0ubuntu0.20.04.1)
	groovy	Released (84.0+build3-0ubuntu0.20.10.1)
	xenial	Released (84.0+build3-0ubuntu0.16.04.1)
	impish	Released (84.0+build3-0ubuntu2)
	jammy	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)
mozjs52 Launchpad, Ubuntu, Debian	hirsute	Does not exist
	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
	mantic	Does not exist
thunderbird Launchpad, Ubuntu, Debian	focal	Released (1:78.7.1+build1-0ubuntu0.20.04.1)
	groovy	Released (1:78.6.1+build1-0ubuntu0.20.10.1)
	hirsute	Released (1:78.6.0+build1-0ubuntu1)
	upstream	Released (78.6)
	xenial	Ignored (end of standard support, was needs-triage)
	bionic	Released (1:78.8.1+build1-0ubuntu0.18.04.1)
	impish	Released (1:78.6.0+build1-0ubuntu1)
	jammy	Released (1:78.6.0+build1-0ubuntu1)
	kinetic	Released (1:78.6.0+build1-0ubuntu1)
	lunar	Released (1:78.6.0+build1-0ubuntu1)
	trusty	Does not exist
	mantic	Released (1:78.6.0+build1-0ubuntu1)
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
	lunar	Needs triage
	trusty	Does not exist
	upstream	Needs triage
	xenial	Does not exist
	mantic	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
	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	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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