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 linux-thunderbirdUpgrade firefox-esrUpgrade linux-seamonkeyUpgrade waterfoxUpgrade thunderbirdUpgrade libxulUpgrade seamonkeyUpgrade linux-firefoxUpgrade firefox | 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 the latest version of Mozilla FirefoxUpgrade to Mozilla Firefox ESR version 68.1 | 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 libfirefox-glib-2_0-0Upgrade mozillafirefox-buildsymbolsUpgrade firefox-libffi4Upgrade firefox-libatk-1_0-0Upgrade libsoftokn3Upgrade libfreebl3-32bitUpgrade firefox-gtk3-langUpgrade firefox-libpango-1_0-0Upgrade firefox-gdk-pixbuf-langUpgrade mozilla-nss-toolsUpgrade mozillafirefox-branding-upstreamUpgrade firefox-libgtk-3-0Upgrade firefox-atk-langUpgrade mozilla-nss-certs-32bitUpgrade firefox-gtk3-immodule-ximUpgrade firefox-libcairo-gobject2Upgrade mozilla-nss-certsUpgrade firefox-libcairo2Upgrade firefox-gdk-pixbuf-thumbnailerUpgrade firefox-gtk3-toolsUpgrade mozilla-nssUpgrade firefox-gtk3-immodule-amharicUpgrade firefox-gdk-pixbuf-query-loadersUpgrade mozilla-nss-32bitUpgrade MozillaFirefox-translations-otherUpgrade libfirefox-gio-2_0-0Upgrade firefox-glib2-toolsUpgrade firefox-gtk3-dataUpgrade firefox-gtk3-immodule-inuktitutUpgrade libfreebl3Upgrade mozillafirefox-branding-sleUpgrade firefox-gtk3-immodules-tigrignaUpgrade firefox-gtk3-immodule-vietnameseUpgrade firefox-libffi7Upgrade mozilla-nss-develUpgrade firefox-gtk3-branding-upstreamUpgrade firefox-gtk3-immodule-multipressUpgrade firefox-gtk3-immodule-thaiUpgrade firefox-gio-branding-upstreamUpgrade mozilla-nspr-develUpgrade MozillaFirefox-translations-commonUpgrade libfirefox-gthread-2_0-0Upgrade firefox-libharfbuzz0Upgrade libfirefox-gobject-2_0-0Upgrade mozilla-nsprUpgrade firefox-glib2-langUpgrade MozillaFirefox-branding-SLEDUpgrade libsoftokn3-32bitUpgrade MozillaFirefox-develUpgrade mozilla-nspr-32bitUpgrade MozillaFirefoxUpgrade libfirefox-gmodule-2_0-0Upgrade firefox-libgdk_pixbuf-2_0-0 | Oct 8, 2019 | Sep 3, 2019 |
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