CVE-2021-38493

Published: 8 September 2021

Mozilla developers reported memory safety bugs present in Firefox 91 and Firefox ESR 78.13. Some of these bugs showed evidence of memory corruption and we presume that with enough effort some of these could have been exploited to run arbitrary code. This vulnerability affects Firefox ESR < 78.14, Thunderbird < 78.14, and Firefox < 92.

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	jammy	Released (92.0+build3-0ubuntu1)
	kinetic	Released (92.0+build3-0ubuntu1)
	impish	Released (92.0+build3-0ubuntu1)
	trusty	Does not exist
	xenial	Ignored (end of standard support, was needed)
	upstream	Released (92)
	bionic	Released (92.0+build3-0ubuntu0.18.04.1)
	focal	Released (92.0+build3-0ubuntu0.20.04.1)
	hirsute	Released (92.0+build3-0ubuntu0.21.04.1)
	lunar	Released (92.0+build3-0ubuntu1)
firefox-esr Launchpad, Ubuntu, Debian	jammy	Does not exist
	kinetic	Does not exist
	impish	Does not exist
	trusty	Does not exist
	xenial	Ignored (end of standard support)
	bionic	Does not exist
	focal	Does not exist
	hirsute	Does not exist
	upstream	Released (78.14.0esr-1)
	lunar	Does not exist
mozjs38 Launchpad, Ubuntu, Debian	jammy	Does not exist
	kinetic	Does not exist
	impish	Does not exist
	trusty	Does not exist
	xenial	Does not exist
	bionic	Needs triage
	focal	Does not exist
	hirsute	Does not exist
	upstream	Needs triage
	lunar	Does not exist
mozjs52 Launchpad, Ubuntu, Debian	jammy	Does not exist
	kinetic	Does not exist
	impish	Does not exist
	trusty	Does not exist
	xenial	Does not exist
	bionic	Needs triage
	focal	Needs triage
	hirsute	Does not exist
	upstream	Needs triage
	lunar	Does not exist
mozjs68 Launchpad, Ubuntu, Debian	jammy	Does not exist
	kinetic	Does not exist
	impish	Does not exist
	trusty	Does not exist
	xenial	Does not exist
	bionic	Does not exist
	focal	Needs triage
	hirsute	Does not exist
	upstream	Needs triage
	lunar	Does not exist
mozjs78 Launchpad, Ubuntu, Debian	jammy	Needs triage
	trusty	Does not exist
	xenial	Does not exist
	bionic	Does not exist
	focal	Does not exist
	upstream	Needs triage
	hirsute	Ignored (end of life)
	kinetic	Ignored (end of life, was needs-triage)
	impish	Ignored (end of life)
	lunar	Needs triage
thunderbird Launchpad, Ubuntu, Debian	jammy	Not vulnerable (1:91.1.2+build1-0ubuntu1)
	kinetic	Not vulnerable (1:91.1.2+build1-0ubuntu1)
	impish	Not vulnerable (1:91.1.2+build1-0ubuntu1)
	bionic	Released (1:78.14.0+build1-0ubuntu0.18.04.1)
	trusty	Does not exist
	xenial	Ignored (end of standard support, was needed)
	upstream	Released (78.14)
	focal	Released (1:78.14.0+build1-0ubuntu0.20.04.1)
	hirsute	Released (1:78.14.0+build1-0ubuntu0.21.04.1)
	lunar	Not vulnerable (1:91.1.2+build1-0ubuntu1)

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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