Windows Hard Link in Mozilla Firefox - CVE-2019-11736
Published: September 3, 2019
Vulnerability identifier: #VU20821
CSH Severity: Low
CVSS v4.0: CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear
CVE-ID: CVE-2019-11736
CWE-ID: CWE-65
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vendor: Mozilla
Affected software:
Mozilla Firefox
Mozilla Firefox
Detailed vulnerability description
The vulnerability allows a local user to escalate privileges on the system.
The vulnerability exists due to the Mozilla Maintenance Service does not guard against files being hardlinked to another file in the updates directory. A local user can create a hardlink to a privileged file and replace it with malicious one. Successful exploitation of the vulnerability may allow a local us to escalate privileges on the system.
Note, the vulnerability affects Windows installation only.
How to mitigate CVE-2019-11736
Install updates from vendor's website.