CVE-2019-11736

The Mozilla Maintenance Service does not guard against files being
hardlinked to another file in the updates directory, allowing for the
replacement of local files, including the Maintenance Service executable,
which is run with privileged access. Additionally, there was a race
condition during checks for junctions and symbolic links by the Maintenance
Service, allowing for potential local file and directory manipulation to be
undetected in some circumstances. This allows for potential privilege
escalation by a user with unprivileged local access. <br>Note: These
attacks requires local system access and only affects Windows. Other
operating systems are not affected.. This vulnerability affects Firefox <
69 and Firefox ESR < 68.1.

Notes