#VU48460 Origin validation error in Mozilla Firefox and Firefox ESR - CVE-2020-16012
Published: November 17, 2020 / Updated: January 11, 2021
Vulnerability identifier: #VU48460
Vulnerability risk: Medium
CVSSv4.0: 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/E:P/U:Green
CVE-ID: CVE-2020-16012
CWE-ID: CWE-346
Exploitation vector: Remote access
Exploit availability:
Public exploit is available
Vulnerable software:
Mozilla Firefox
Firefox ESR
Mozilla Firefox
Firefox ESR
Software vendor:
Mozilla
Mozilla
Description
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.
Remediation
Install updates from vendor's website.