CVE-2021-23961

Further techniques that built on the slipstream research combined with a malicious webpage could have exposed both an internal network's hosts as well as services running on the user's local machine. This vulnerability affects Firefox < 85.

Read the notes from the security team

Status

Show unmaintained releases

Package	Ubuntu Release	Status
firefox	24.04 LTS noble	Fixed 85.0+build1-0ubuntu1
	23.10 mantic	Fixed 85.0+build1-0ubuntu1
	23.04 lunar	Fixed 85.0+build1-0ubuntu1
	22.10 kinetic	Fixed 85.0+build1-0ubuntu1
	22.04 LTS jammy	Fixed 85.0+build1-0ubuntu1
	21.10 impish	Fixed 85.0+build1-0ubuntu1
	21.04 hirsute	Fixed 85.0+build1-0ubuntu1
	20.10 groovy	Fixed 85.0+build1-0ubuntu0.20.10.1
	20.04 LTS focal	Fixed 85.0+build1-0ubuntu0.20.04.1
	18.04 LTS bionic	Fixed 85.0+build1-0ubuntu0.18.04.1
	16.04 LTS xenial	Fixed 85.0+build1-0ubuntu0.16.04.1
	14.04 LTS trusty	Not in release
mozjs38	24.04 LTS noble	Not in release
	23.10 mantic	Not in release
	23.04 lunar	Not in release
	22.10 kinetic	Not in release
	22.04 LTS jammy	Not in release
	21.10 impish	Not in release
	21.04 hirsute	Not in release
	20.10 groovy	Not in release
	20.04 LTS focal	Not in release
	18.04 LTS bionic	Ignored
	16.04 LTS xenial	Not in release
	14.04 LTS trusty	Not in release
mozjs52	24.04 LTS noble	Not in release
	23.10 mantic	Not in release
	23.04 lunar	Not in release
	22.10 kinetic	Not in release
	22.04 LTS jammy	Not in release
	21.10 impish	Not in release
	21.04 hirsute	Not in release
	20.10 groovy	Ignored end of life
	20.04 LTS focal	Ignored
	18.04 LTS bionic	Ignored
	16.04 LTS xenial	Not in release
	14.04 LTS trusty	Not in release
mozjs60	24.04 LTS noble	Not in release
	23.10 mantic	Not in release
	23.04 lunar	Not in release
	22.10 kinetic	Not in release
	22.04 LTS jammy	Not in release
	21.10 impish	Not in release
	21.04 hirsute	Not in release
	20.10 groovy	Not in release
	20.04 LTS focal	Not in release
	18.04 LTS bionic	Not in release
	16.04 LTS xenial	Not in release
	14.04 LTS trusty	Not in release
mozjs68	24.04 LTS noble	Not in release
	23.10 mantic	Not in release
	23.04 lunar	Not in release
	22.10 kinetic	Not in release
	22.04 LTS jammy	Not in release
	21.10 impish	Not in release
	21.04 hirsute	Not in release
	20.10 groovy	Ignored end of life
	20.04 LTS focal	Ignored
	18.04 LTS bionic	Not in release
	16.04 LTS xenial	Not in release
	14.04 LTS trusty	Not in release
mozjs78	24.04 LTS noble	Not in release
	23.10 mantic	Not in release
	23.04 lunar	Ignored end of life, was needs-triage
	22.10 kinetic	Ignored end of life, was needs-triage
	22.04 LTS jammy	Ignored
	21.10 impish	Ignored end of life
	21.04 hirsute	Ignored end of life
	20.10 groovy	Ignored end of life
	20.04 LTS focal	Not in release
	18.04 LTS bionic	Not in release
	16.04 LTS xenial	Not in release
	14.04 LTS trusty	Not in release
thunderbird	24.04 LTS noble	Fixed 1:78.11.0+build1-0ubuntu2
	23.10 mantic	Fixed 1:78.11.0+build1-0ubuntu2
	23.04 lunar	Fixed 1:78.11.0+build1-0ubuntu2
	22.10 kinetic	Fixed 1:78.11.0+build1-0ubuntu2
	22.04 LTS jammy	Fixed 1:78.11.0+build1-0ubuntu2
	21.10 impish	Fixed 1:78.11.0+build1-0ubuntu2
	21.04 hirsute	Fixed 1:78.11.0+build1-0ubuntu0.21.04.2
	20.10 groovy	Fixed 1:78.11.0+build1-0ubuntu0.20.10.2
	20.04 LTS focal	Fixed 1:78.11.0+build1-0ubuntu0.20.04.2
	18.04 LTS bionic	Fixed 1:78.11.0+build1-0ubuntu0.18.04.2
	16.04 LTS xenial	Ignored end of standard support
	14.04 LTS trusty	Not in release

Notes

tyhicks

mozjs contains a copy of the SpiderMonkey JavaScript engine

Severity score breakdown

Parameter	Value
Base score	7.4 · High
Attack vector	Network
Attack complexity	Low
Privileges required	None
User interaction	Required
Scope	Changed
Confidentiality	High
Integrity impact	None
Availability impact	None
Vector	CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:N/A:N

References

Related Ubuntu Security Notices (USN)

USN-4717-1
Firefox vulnerabilities
1 February 2021

USN-4995-1
Thunderbird vulnerabilities
22 June 2021

USN-4995-2
Thunderbird vulnerabilities
25 June 2021