CVE-2020-26951
Published: 17 November 2020
A parsing and event loading mismatch in Firefox's SVG code could have allowed load events to fire, even after sanitization. An attacker already capable of exploiting an XSS vulnerability in privileged internal pages could have used this attack to bypass our built-in sanitizer. This vulnerability affects Firefox < 83, Firefox ESR < 78.5, and Thunderbird < 78.5.
Notes
Author | Note |
---|---|
tyhicks | mozjs contains a copy of the SpiderMonkey JavaScript engine |
Priority
Status
Package | Release | Status |
---|---|---|
firefox Launchpad, Ubuntu, Debian |
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)
|
|
kinetic |
Released
(83.0+build2-0ubuntu1)
|
|
lunar |
Released
(83.0+build2-0ubuntu1)
|
|
mantic |
Released
(83.0+build2-0ubuntu1)
|
|
noble |
Released
(83.0+build2-0ubuntu1)
|
|
trusty |
Does not exist
|
|
upstream |
Released
(83)
|
|
xenial |
Released
(83.0+build2-0ubuntu0.16.04.3)
|
|
mozjs38 Launchpad, Ubuntu, Debian |
bionic |
Needs triage
|
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
|
|
mantic |
Does not exist
|
|
noble |
Does not exist
|
|
trusty |
Does not exist
|
|
upstream |
Needs triage
|
|
xenial |
Does not exist
|
|
mozjs52 Launchpad, Ubuntu, Debian |
bionic |
Needs triage
|
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
|
|
mantic |
Does not exist
|
|
noble |
Does not exist
|
|
trusty |
Does not exist
|
|
upstream |
Needs triage
|
|
xenial |
Does not exist
|
|
mozjs60 Launchpad, Ubuntu, Debian |
bionic |
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
|
|
mantic |
Does not exist
|
|
noble |
Does not exist
|
|
trusty |
Does not exist
|
|
upstream |
Needs triage
|
|
xenial |
Does not exist
|
|
mozjs68 Launchpad, Ubuntu, Debian |
bionic |
Does not exist
|
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
|
|
mantic |
Does not exist
|
|
noble |
Does not exist
|
|
trusty |
Does not exist
|
|
upstream |
Needs triage
|
|
xenial |
Does not exist
|
|
thunderbird Launchpad, Ubuntu, Debian |
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)
|
|
kinetic |
Released
(1:78.5.0+build3-0ubuntu1)
|
|
lunar |
Released
(1:78.5.0+build3-0ubuntu1)
|
|
mantic |
Released
(1:78.5.0+build3-0ubuntu1)
|
|
noble |
Released
(1:78.5.0+build3-0ubuntu1)
|
|
trusty |
Does not exist
|
|
upstream |
Released
(78.5)
|
|
xenial |
Ignored
(end of standard support, was needs-triage)
|
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 |
References
- https://www.mozilla.org/en-US/security/advisories/mfsa2020-50/#CVE-2020-26951
- https://www.mozilla.org/en-US/security/advisories/mfsa2020-52/#CVE-2020-26951
- https://ubuntu.com/security/notices/USN-4637-1
- https://ubuntu.com/security/notices/USN-4637-2
- https://ubuntu.com/security/notices/USN-4647-1
- https://www.cve.org/CVERecord?id=CVE-2020-26951
- NVD
- Launchpad
- Debian