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CVE-2019-11763

Published: 23 October 2019

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.

Notes

AuthorNote
tyhicks
mozjs contains a copy of the SpiderMonkey JavaScript engine

Priority

Medium

Cvss 3 Severity Score

6.1

Score breakdown

Status

Package Release Status
firefox
Launchpad, Ubuntu, Debian
bionic
Released (70.0+build2-0ubuntu0.18.04.1)
disco
Released (70.0+build2-0ubuntu0.19.04.1)
eoan
Released (70.0+build2-0ubuntu0.19.10.1)
focal
Released (70.0+build2-0ubuntu1)
groovy
Released (70.0+build2-0ubuntu1)
hirsute
Released (70.0+build2-0ubuntu1)
impish
Released (70.0+build2-0ubuntu1)
jammy
Released (70.0+build2-0ubuntu1)
kinetic
Released (70.0+build2-0ubuntu1)
lunar
Released (70.0+build2-0ubuntu1)
trusty Does not exist

upstream
Released (70.0)
xenial
Released (70.0+build2-0ubuntu0.16.04.1)
mantic
Released (70.0+build2-0ubuntu1)
mozjs38
Launchpad, Ubuntu, Debian
bionic Needs triage

disco Does not exist

eoan 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

mozjs52
Launchpad, Ubuntu, Debian
bionic Needs triage

disco Ignored
(end of life)
eoan Ignored
(end of life)
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

mozjs60
Launchpad, Ubuntu, Debian
bionic Does not exist

disco Ignored
(end of life)
eoan Ignored
(end of life)
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

thunderbird
Launchpad, Ubuntu, Debian
bionic
Released (1:68.2.1+build1-0ubuntu0.18.04.1)
disco Ignored
(end of life)
eoan
Released (1:68.2.1+build1-0ubuntu0.19.10.1)
focal
Released (1:68.2.0+build1.1-0ubuntu1)
groovy
Released (1:68.2.0+build1.1-0ubuntu1)
hirsute
Released (1:68.2.0+build1.1-0ubuntu1)
impish
Released (1:68.2.0+build1.1-0ubuntu1)
jammy
Released (1:68.2.0+build1.1-0ubuntu1)
kinetic
Released (1:68.2.0+build1.1-0ubuntu1)
lunar
Released (1:68.2.0+build1.1-0ubuntu1)
trusty Does not exist

upstream
Released (68.2)
xenial
Released (1:68.7.0+build1-0ubuntu0.16.04.2)
mantic
Released (1:68.2.0+build1.1-0ubuntu1)

Severity score breakdown

Parameter Value
Base score 6.1
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