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CVE-2020-26961

Published: 17 November 2020

When DNS over HTTPS is in use, it intentionally filters RFC1918 and related IP ranges from the responses as these do not make sense coming from a DoH resolver. However when an IPv4 address was mapped through IPv6, these addresses were erroneously let through, leading to a potential DNS Rebinding attack. This vulnerability affects Firefox < 83, Firefox ESR < 78.5, and Thunderbird < 78.5.

Notes

AuthorNote
tyhicks
mozjs contains a copy of the SpiderMonkey JavaScript engine

Priority

Medium

Cvss 3 Severity Score

6.5

Score breakdown

Status

Package Release Status
mozjs52
Launchpad, Ubuntu, Debian
groovy Ignored
(end of life)
bionic Needs triage

hirsute Does not exist

kinetic Does not exist

lunar Does not exist

focal Needs triage

impish Does not exist

jammy Does not exist

trusty Does not exist

upstream Needs triage

xenial Does not exist

mantic Does not exist

firefox
Launchpad, Ubuntu, Debian
xenial
Released (83.0+build2-0ubuntu0.16.04.3)
kinetic
Released (83.0+build2-0ubuntu1)
lunar
Released (83.0+build2-0ubuntu1)
bionic
Released (83.0+build2-0ubuntu0.18.04.2)
focal
Released (83.0+build2-0ubuntu0.20.04.1)
groovy
Released (83.0+build2-0ubuntu0.20.10.1)
hirsute
Released (83.0+build2-0ubuntu1)
impish
Released (83.0+build2-0ubuntu1)
jammy
Released (83.0+build2-0ubuntu1)
trusty Does not exist

upstream
Released (83)
mantic
Released (83.0+build2-0ubuntu1)
mozjs38
Launchpad, Ubuntu, Debian
bionic Needs triage

focal Does not exist

kinetic Does not exist

lunar Does not exist

groovy Does not exist

hirsute Does not exist

impish Does not exist

jammy 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

focal Does not exist

kinetic Does not exist

lunar Does not exist

groovy Does not exist

hirsute Does not exist

impish Does not exist

jammy Does not exist

trusty Does not exist

upstream Needs triage

xenial Does not exist

mantic Does not exist

mozjs68
Launchpad, Ubuntu, Debian
groovy Ignored
(end of life)
kinetic Does not exist

lunar Does not exist

bionic Does not exist

focal Needs triage

hirsute Does not exist

impish Does not exist

jammy Does not exist

trusty Does not exist

upstream Needs triage

xenial Does not exist

mantic Does not exist

thunderbird
Launchpad, Ubuntu, Debian
kinetic
Released (1:78.5.0+build3-0ubuntu1)
lunar
Released (1:78.5.0+build3-0ubuntu1)
xenial Ignored
(end of standard support, was needs-triage)
bionic
Released (1:78.8.1+build1-0ubuntu0.18.04.1)
focal
Released (1:78.7.1+build1-0ubuntu0.20.04.1)
groovy
Released (1:78.5.0+build3-0ubuntu0.20.10.1)
hirsute
Released (1:78.5.0+build3-0ubuntu1)
impish
Released (1:78.5.0+build3-0ubuntu1)
jammy
Released (1:78.5.0+build3-0ubuntu1)
trusty Does not exist

upstream
Released (78.5)
mantic
Released (1:78.5.0+build3-0ubuntu1)

Severity score breakdown

Parameter Value
Base score 6.5
Attack vector Network
Attack complexity Low
Privileges required None
User interaction Required
Scope Unchanged
Confidentiality None
Integrity impact High
Availability impact None
Vector CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N