Origin validation error in Mozilla Firefox - CVE-2020-12424

Vulnerability identifier: #VU29463

CSH Severity: Medium

CVSS v4: 5.1 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N]

CVE-ID: CVE-2020-12424

CWE-ID: CWE-346

Exploitation vector: Remote access

Exploit availability: No public exploit available

The vulnerability allows a remote attacker to bypass implemented security restrictions.

The vulnerability exists due to an error when processing URI permissions in WebRTC. A remote attacker can bypass WebRTC permissions prompt dialog.

Mozilla Firefox
Gentoo Linux
Red Hat Enterprise Linux for Power, little endian
Red Hat Enterprise Linux for Power, big endian
Red Hat Enterprise Linux for IBM z Systems
Red Hat Enterprise Linux Desktop
Red Hat Enterprise Linux Workstation
Red Hat Enterprise Linux Server
Red Hat Enterprise Linux for ARM 64
Red Hat Enterprise Linux for x86_64
Red Hat Enterprise Linux for ARM 64 - Extended Update Support
Red Hat Enterprise Linux for Power, little endian - Extended Update Support
Red Hat Enterprise Linux for IBM z Systems - Extended Update Support
Red Hat Enterprise Linux for x86_64 - Extended Update Support
Red Hat Enterprise Linux Server - TUS
Opensuse
Ubuntu
Red Hat Enterprise Linux Server for Power LE - Update Services for SAP Solutions
Red Hat Enterprise Linux Server for x86_64 - Update Services for SAP Solutions
firefox (Alpine package)
firefox (Red Hat package)
firefox (Ubuntu package)
Mozilla Thunderbird

Install updates from vendor's website.

Mozilla Firefox - update to 78.0.1
Mozilla Thunderbird - addressed in versions 68.10.0, 78.0
firefox (Alpine package) - update to 78.0.1-r0
firefox (Red Hat package) - addressed in versions 78.2.0-2.el8_2, 78.2.0-3.el8_0, 78.2.0-3.el8_1, 78.3.0-1.el7_9
firefox (Ubuntu package) - addressed in versions 78.0.1+build1-0ubuntu0.16.04.1, 78.0.1+build1-0ubuntu0.18.04.1, 78.0.1+build1-0ubuntu0.19.10.1, 78.0.1+build1-0ubuntu0.20.04.1

• https://www.mozilla.org/en-US/security/advisories/mfsa2020-24/

• Multiple vulnerabilities in Mozilla Firefox and Firefox ESR
• OpenSUSE Linux update for MozillaFirefox
• OpenSUSE Linux update for MozillaFirefox
• Gentoo update for Mozilla Firefox
• Origin validation error in firefox (Alpine package)
• Red Hat Enterprise Linux 8 update for firefox
• Red Hat Enterprise Linux 8 update for firefox
• Red Hat Enterprise Linux 8 update for firefox
• Multiple vulnerabilities in Mozilla Thunderbird
• Red Hat Enterprise Linux 7 update for firefox
• Ubuntu update for firefox