Insecure DLL loading in Mozilla Firefox - CVE-2020-12423
Published: July 2, 2020 / Updated: July 31, 2020
Vulnerability identifier: #VU29462
CSH Severity: Medium
CVSS v4: 7.5 [CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:A/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2020-12423
CWE-ID: CWE-427
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to compromise vulnerable system.
The vulnerability exists due to the application loads the "webauthn.dll" DLL library in an insecure manner. A remote attacker can place a specially crafted .dll file on a remote SMB fileshare, trick the victim into opening a file, associated with the vulnerable application, and execute arbitrary code on victim's system.
Affected software
Mozilla Firefox
Opensuse
Mozilla Thunderbird
firefox (Alpine package)
Opensuse
Mozilla Thunderbird
firefox (Alpine package)
How to mitigate CVE-2020-12423
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
Mozilla Thunderbird - addressed in versions 68.10.0, 78.0
firefox (Alpine package) - update to 78.0.1-r0