CVE-2019-11763

Failure to correctly handle null bytes when processing HTML entities resulted in Firefox incorrectly parsing these entities. This could have led to HTML comment text being treated as HTML which could have led to XSS in a web application under certain conditions. It could have also led to HTML entities being masked from filters - enabling the use of entities to mask the actual characters of interest from filters. This vulnerability affects Firefox < 70, Thunderbird < 68.2, and Firefox ESR < 68.2.

Read the notes from the security team

Status

Show unmaintained releases

Package	Ubuntu Release	Status
firefox	24.04 LTS noble	Fixed 70.0+build2-0ubuntu1
	23.10 mantic	Fixed 70.0+build2-0ubuntu1
	23.04 lunar	Fixed 70.0+build2-0ubuntu1
	22.10 kinetic	Fixed 70.0+build2-0ubuntu1
	22.04 LTS jammy	Fixed 70.0+build2-0ubuntu1
	21.10 impish	Fixed 70.0+build2-0ubuntu1
	21.04 hirsute	Fixed 70.0+build2-0ubuntu1
	20.10 groovy	Fixed 70.0+build2-0ubuntu1
	20.04 LTS focal	Fixed 70.0+build2-0ubuntu1
	19.10 eoan	Fixed 70.0+build2-0ubuntu0.19.10.1
	19.04 disco	Fixed 70.0+build2-0ubuntu0.19.04.1
	18.04 LTS bionic	Fixed 70.0+build2-0ubuntu0.18.04.1
	16.04 LTS xenial	Fixed 70.0+build2-0ubuntu0.16.04.1
	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
	19.10 eoan	Not in release
	19.04 disco	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
	19.10 eoan	Ignored end of life
	19.04 disco	Ignored end of life
	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
	19.10 eoan	Ignored end of life
	19.04 disco	Ignored end of life
	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 1:68.2.0+build1.1-0ubuntu1
	23.10 mantic	Fixed 1:68.2.0+build1.1-0ubuntu1
	23.04 lunar	Fixed 1:68.2.0+build1.1-0ubuntu1
	22.10 kinetic	Fixed 1:68.2.0+build1.1-0ubuntu1
	22.04 LTS jammy	Fixed 1:68.2.0+build1.1-0ubuntu1
	21.10 impish	Fixed 1:68.2.0+build1.1-0ubuntu1
	21.04 hirsute	Fixed 1:68.2.0+build1.1-0ubuntu1
	20.10 groovy	Fixed 1:68.2.0+build1.1-0ubuntu1
	20.04 LTS focal	Fixed 1:68.2.0+build1.1-0ubuntu1
	19.10 eoan	Fixed 1:68.2.1+build1-0ubuntu0.19.10.1
	19.04 disco	Ignored end of life
	18.04 LTS bionic	Fixed 1:68.2.1+build1-0ubuntu0.18.04.1
	16.04 LTS xenial	Fixed 1:68.7.0+build1-0ubuntu0.16.04.2
	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	6.1 · Medium
Attack vector	Network
Attack complexity	Low
Privileges required	None
User interaction	Required
Scope	Changed
Confidentiality	Low
Integrity impact	Low
Availability impact	None
Vector	CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

References

Related Ubuntu Security Notices (USN)

USN-4202-1
Thunderbird vulnerabilities
26 November 2019

USN-4335-1
Thunderbird vulnerabilities
21 April 2020

USN-4165-1
Firefox vulnerabilities
23 October 2019