CVE-2020-26974

Published: 15 December 2020

When flex-basis was used on a table wrapper, a StyleGenericFlexBasis object could have been incorrectly cast to the wrong type. This resulted in a heap user-after-free, memory corruption, and a potentially exploitable crash. 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	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)
	hirsute	Released (84.0+build3-0ubuntu2)
	impish	Released (84.0+build3-0ubuntu2)
	jammy	Released (84.0+build3-0ubuntu2)
	kinetic	Released (84.0+build3-0ubuntu2)
	lunar	Released (84.0+build3-0ubuntu2)
	mantic	Released (84.0+build3-0ubuntu2)
	noble	Released (84.0+build3-0ubuntu2)
	trusty	Does not exist
	upstream	Released (84)
	xenial	Released (84.0+build3-0ubuntu0.16.04.1)
mozjs38 Launchpad, Ubuntu, Debian	bionic	Ignored
	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
	mantic	Does not exist
	noble	Does not exist
	trusty	Does not exist
	upstream	Ignored
	xenial	Does not exist
mozjs52 Launchpad, Ubuntu, Debian	bionic	Ignored
	focal	Ignored
	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
	mantic	Does not exist
	noble	Does not exist
	trusty	Does not exist
	upstream	Ignored
	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
	lunar	Does not exist
	mantic	Does not exist
	noble	Does not exist
	trusty	Does not exist
	upstream	Ignored
	xenial	Does not exist
mozjs68 Launchpad, Ubuntu, Debian	bionic	Does not exist
	focal	Ignored
	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
	mantic	Does not exist
	noble	Does not exist
	trusty	Does not exist
	upstream	Ignored
	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)
	impish	Ignored (end of life)
	jammy	Ignored
	kinetic	Ignored (end of life, was needs-triage)
	lunar	Ignored (end of life, was needs-triage)
	mantic	Does not exist
	noble	Does not exist
	trusty	Does not exist
	upstream	Ignored
	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 (1:78.6.1+build1-0ubuntu0.20.10.1)
	hirsute	Released (1:78.6.0+build1-0ubuntu1)
	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)
	mantic	Released (1:78.6.0+build1-0ubuntu1)
	noble	Released (1:78.6.0+build1-0ubuntu1)
	trusty	Does not exist
	upstream	Released (78.6)
	xenial	Ignored (end of standard support, was needs-triage)

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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