Description
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.
References (6)
Core 6
Core References
Issue Tracking, Permissions Required, Vendor Advisory x_refsource_misc
https://bugzilla.mozilla.org/show_bug.cgi?id=1551913
Issue Tracking, Permissions Required, Vendor Advisory x_refsource_misc
https://bugzilla.mozilla.org/show_bug.cgi?id=1552206
Vendor Advisory x_refsource_confirm
https://www.mozilla.org/security/advisories/mfsa2019-25/
Vendor Advisory x_refsource_confirm
https://www.mozilla.org/security/advisories/mfsa2019-26/
Mailing List vendor-advisory
x_refsource_suse
http://lists.opensuse.org/opensuse-security-announce/2019-10/msg00011.html
Mailing List vendor-advisory
x_refsource_suse
http://lists.opensuse.org/opensuse-security-announce/2019-10/msg00017.html
Scores
CVSS v3
7.0
EPSS
0.0006
EPSS Percentile
17.7%
Attack Vector
LOCAL
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
Details
CWE
CWE-362
Status
published
Products (2)
mozilla/firefox
< 69.0
mozilla/firefox_esr
< 68.1.0
Published
Sep 27, 2019
Tracked Since
Feb 18, 2026