Origin validation error in Firefox ESR and Mozilla Firefox - CVE-2020-16012

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Main Vulnerability Database Vulnerabilities #VU48460

Origin validation error in Firefox ESR and Mozilla Firefox - CVE-2020-16012

Published: November 17, 2020 / Updated: January 11, 2021


Vulnerability identifier: #VU48460
CSH Severity: Medium
CVSS v4: 5.1 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N]
CVE-ID: CVE-2020-16012
CWE-ID: CWE-346
Exploitation vector: Remote access
Exploit availability: Public exploit is available

Vulnerability details

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

The vulnerability exists due to the way browser handles requests to cross-origin images. When drawing a transparent image on top of an unknown cross-origin image, the Skia library drawImage function takes a variable amount of time depending on the content of the underlying image. This results in cross-origin information exposure of image content through timing side-channel attacks.


Affected software

Firefox ESR
Mozilla Firefox
Google Chrome
Gentoo Linux
Arch Linux
Red Hat Enterprise Linux for Scientific Computing
Red Hat Enterprise Linux Server
Red Hat Enterprise Linux Workstation
Red Hat Enterprise Linux Desktop
Red Hat Enterprise Linux for IBM z Systems
Red Hat Enterprise Linux for Power, big endian
Fedora
Red Hat Enterprise Linux for Power, little endian
CentOS
Red Hat Enterprise Linux for x86_64
Red Hat Enterprise Linux for ARM 64
Red Hat Enterprise Linux for x86_64 - Extended Update Support
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 Server - TUS
Ubuntu
openEuler
Red Hat Enterprise Linux Server for x86_64 - Update Services for SAP Solutions
Red Hat Enterprise Linux Server for Power LE - Update Services for SAP Solutions
thunderbird (Red Hat package)
firefox (Red Hat package)
firefox-esr (Debian package)
thunderbird (Debian package)
chromium (Debian package)
firefox (Alpine package)
firefox-esr (Alpine package)
thunderbird (Alpine package)
thunderbird (Ubuntu package)
firefox
firefox-debuginfo
firefox-debugsource
mozilla-crashreporter-firefox-debuginfo
firefox (Ubuntu package)
chromium
Mozilla Thunderbird
Firefox for Android

How to mitigate CVE-2020-16012

Install updates from vendor's website.

Firefox ESR - update to 78.5.0
Mozilla Firefox - update to 83.0
Mozilla Thunderbird - update to 78.5.0
thunderbird (Red Hat package) - addressed in versions 78.5.0-1.el6_10, 78.5.0-1.el7_9, 78.5.0-1.el8_0, 78.5.0-1.el8_1, 78.5.0-1.el8_2, 78.5.0-1.el8_3
firefox (Red Hat package) - addressed in versions 78.5.0-1.el6_10, 78.5.0-1.el7_9, 78.5.0-1.el8_0, 78.5.0-1.el8_1, 78.5.0-1.el8_2, 78.5.0-1.el8_3
firefox-esr (Debian package) - update to 78.5.0esr-1~deb10u1
thunderbird (Debian package) - update to 1:78.5.0-1~deb10u1
chromium (Debian package) - update to 87.0.4280.88-0.4~deb10u1
firefox-esr (Alpine package) - update to 78.5.0-r0
thunderbird (Alpine package) - update to 78.5.1-r0
Firefox for Android - update to 83.0.0
thunderbird (Ubuntu package) - update to 1:78.5.0+build3-0ubuntu0.20.10.1
firefox - update to 79.0-12
firefox-debuginfo - update to 79.0-12
firefox-debugsource - update to 79.0-12
mozilla-crashreporter-firefox-debuginfo - update to 79.0-12
firefox (Ubuntu package) - addressed in versions 83.0+build2-0ubuntu0.16.04.3, 83.0+build2-0ubuntu0.18.04.2, 83.0+build2-0ubuntu0.20.04.1, 83.0+build2-0ubuntu0.20.10.1
Google Chrome - update to 87.0.4280.66
chromium - addressed in versions 87.0.4280.66-1.el7, 87.0.4280.66-1.el8, 87.0.4280.66-1.fc32, 87.0.4280.66-1.fc33, 87.0.4280.88-1.el7, 87.0.4280.88-1.el8

Links to Public Exploits and PoC-codes

External References

Related Security Bulletins