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.
Priority
Medium
CVSS 3 base score: 6.1
Status
| Package | Release | Status |
|---|---|---|
|
firefox Launchpad, Ubuntu, Debian |
Upstream |
Released
(83)
|
| Ubuntu 21.04 (Hirsute Hippo) |
Released
(83.0+build2-0ubuntu1)
|
|
| Ubuntu 20.10 (Groovy Gorilla) |
Released
(83.0+build2-0ubuntu0.20.10.1)
|
|
| Ubuntu 20.04 LTS (Focal Fossa) |
Released
(83.0+build2-0ubuntu0.20.04.1)
|
|
| Ubuntu 18.04 LTS (Bionic Beaver) |
Released
(83.0+build2-0ubuntu0.18.04.2)
|
|
| Ubuntu 16.04 ESM (Xenial Xerus) |
Released
(83.0+build2-0ubuntu0.16.04.3)
|
|
| Ubuntu 14.04 ESM (Trusty Tahr) |
Does not exist
|
|
|
mozjs38 Launchpad, Ubuntu, Debian |
Upstream |
Needs triage
|
| Ubuntu 21.04 (Hirsute Hippo) |
Does not exist
|
|
| Ubuntu 20.10 (Groovy Gorilla) |
Does not exist
|
|
| Ubuntu 20.04 LTS (Focal Fossa) |
Does not exist
|
|
| Ubuntu 18.04 LTS (Bionic Beaver) |
Needs triage
|
|
| Ubuntu 16.04 ESM (Xenial Xerus) |
Does not exist
|
|
| Ubuntu 14.04 ESM (Trusty Tahr) |
Does not exist
|
|
|
mozjs52 Launchpad, Ubuntu, Debian |
Upstream |
Needs triage
|
| Ubuntu 21.04 (Hirsute Hippo) |
Does not exist
|
|
| Ubuntu 20.10 (Groovy Gorilla) |
Needs triage
|
|
| Ubuntu 20.04 LTS (Focal Fossa) |
Needs triage
|
|
| Ubuntu 18.04 LTS (Bionic Beaver) |
Needs triage
|
|
| Ubuntu 16.04 ESM (Xenial Xerus) |
Does not exist
|
|
| Ubuntu 14.04 ESM (Trusty Tahr) |
Does not exist
|
|
|
mozjs60 Launchpad, Ubuntu, Debian |
Upstream |
Needs triage
|
| Ubuntu 21.04 (Hirsute Hippo) |
Does not exist
|
|
| Ubuntu 20.10 (Groovy Gorilla) |
Does not exist
|
|
| Ubuntu 20.04 LTS (Focal Fossa) |
Does not exist
|
|
| Ubuntu 18.04 LTS (Bionic Beaver) |
Does not exist
|
|
| Ubuntu 16.04 ESM (Xenial Xerus) |
Does not exist
|
|
| Ubuntu 14.04 ESM (Trusty Tahr) |
Does not exist
|
|
|
mozjs68 Launchpad, Ubuntu, Debian |
Upstream |
Needs triage
|
| Ubuntu 21.04 (Hirsute Hippo) |
Does not exist
|
|
| Ubuntu 20.10 (Groovy Gorilla) |
Needs triage
|
|
| Ubuntu 20.04 LTS (Focal Fossa) |
Needs triage
|
|
| Ubuntu 18.04 LTS (Bionic Beaver) |
Does not exist
|
|
| Ubuntu 16.04 ESM (Xenial Xerus) |
Does not exist
|
|
| Ubuntu 14.04 ESM (Trusty Tahr) |
Does not exist
|
|
|
thunderbird Launchpad, Ubuntu, Debian |
Upstream |
Released
(78.5)
|
| Ubuntu 21.04 (Hirsute Hippo) |
Released
(1:78.5.0+build3-0ubuntu1)
|
|
| Ubuntu 20.10 (Groovy Gorilla) |
Released
(1:78.5.0+build3-0ubuntu0.20.10.1)
|
|
| Ubuntu 20.04 LTS (Focal Fossa) |
Released
(1:78.7.1+build1-0ubuntu0.20.04.1)
|
|
| Ubuntu 18.04 LTS (Bionic Beaver) |
Released
(1:78.8.1+build1-0ubuntu0.18.04.1)
|
|
| Ubuntu 16.04 ESM (Xenial Xerus) |
Needs triage
|
|
| Ubuntu 14.04 ESM (Trusty Tahr) |
Does not exist
|
Notes
| Author | Note |
|---|---|
| tyhicks | mozjs contains a copy of the SpiderMonkey JavaScript engine |
References
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-26951
- 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
- NVD
- Launchpad
- Debian