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.
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Freebsd | — | Upgrade waterfoxUpgrade linux-seamonkeyUpgrade linux-thunderbirdUpgrade firefox-esrUpgrade thunderbirdUpgrade libxulUpgrade firefoxUpgrade linux-firefoxUpgrade seamonkey | Sep 4, 2019 | Sep 3, 2019 |
| Mfsa2019 25 | — | Upgrade to the latest version of Mozilla FirefoxUpgrade to Mozilla Firefox version 69.0 | Sep 4, 2019 | Sep 3, 2019 |
| Mfsa2019 26 | — | Upgrade to Mozilla Firefox ESR version 68.1Upgrade to the latest version of Mozilla Firefox | Sep 4, 2019 | Sep 3, 2019 |
| Oracle Solaris | — | Upgrade web/browser/firefox to version 78.3.0-11.4.27.0.1.82.0 on Solaris 11.4Upgrade web/data/firefox-bookmarks to version 78.3.0-11.4.27.0.1.82.0 on Solaris 11.4Upgrade mail/thunderbird/plugin/thunderbird-lightning to version 68.12.0-11.4.27.0.1.82.0 on Solaris 11.4Upgrade mail/thunderbird to version 78.3.0-11.4.27.0.1.82.0 on Solaris 11.4 | Jan 19, 2021 | Sep 27, 2019 |
| Redhat_linux | — | No solution exists | Jul 9, 2025 | Sep 27, 2019 |
| Suse | — | Upgrade firefox-glib2-langUpgrade MozillaFirefox-translations-commonUpgrade mozilla-nspr-32bitUpgrade firefox-libffi7Upgrade firefox-gio-branding-upstreamUpgrade mozillafirefox-branding-sleUpgrade libfirefox-gobject-2_0-0Upgrade MozillaFirefox-develUpgrade firefox-gtk3-immodule-thaiUpgrade libsoftokn3-32bitUpgrade firefox-gtk3-dataUpgrade firefox-gtk3-immodule-multipressUpgrade mozilla-nss-develUpgrade libfreebl3Upgrade firefox-gtk3-branding-upstreamUpgrade firefox-libgdk_pixbuf-2_0-0Upgrade firefox-gtk3-immodule-inuktitutUpgrade mozilla-nsprUpgrade firefox-gtk3-immodule-vietnameseUpgrade firefox-gtk3-immodules-tigrignaUpgrade libfirefox-gmodule-2_0-0Upgrade firefox-libharfbuzz0Upgrade mozilla-nspr-develUpgrade libfirefox-gthread-2_0-0Upgrade MozillaFirefox-branding-SLEDUpgrade MozillaFirefoxUpgrade firefox-libcairo2Upgrade firefox-libpango-1_0-0Upgrade mozilla-nss-32bitUpgrade mozillafirefox-buildsymbolsUpgrade libfirefox-glib-2_0-0Upgrade firefox-gtk3-langUpgrade libfreebl3-32bitUpgrade mozilla-nss-certsUpgrade libsoftokn3Upgrade firefox-gtk3-toolsUpgrade firefox-gdk-pixbuf-thumbnailerUpgrade mozilla-nss-toolsUpgrade mozillafirefox-branding-upstreamUpgrade mozilla-nssUpgrade firefox-gtk3-immodule-ximUpgrade firefox-libatk-1_0-0Upgrade firefox-glib2-toolsUpgrade libfirefox-gio-2_0-0Upgrade firefox-gtk3-immodule-amharicUpgrade firefox-libffi4Upgrade firefox-libcairo-gobject2Upgrade firefox-gdk-pixbuf-langUpgrade firefox-gdk-pixbuf-query-loadersUpgrade firefox-atk-langUpgrade MozillaFirefox-translations-otherUpgrade mozilla-nss-certs-32bitUpgrade firefox-libgtk-3-0 | Oct 8, 2019 | Sep 3, 2019 |
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