A vulnerability exists where if a user opens a locally saved HTML file, this file can use file: URIs to access other files in the same directory or sub-directories if the names are known or guessed. The Fetch API can then be used to read the contents of any files stored in these directories and they may uploaded to a server. It was demonstrated that in combination with a popular Android messaging app, if a malicious HTML attachment is sent to a user and they opened that attachment in Firefox, due to that app's predictable pattern for locally-saved file names, it is possible to read attachments the victim received from other correspondents. This vulnerability affects Firefox ESR < 60.8, Firefox < 68, and Thunderbird < 60.8.
CVSS Details
- CVSS 3.1 Base Score: 6.5
- CVSS 3.1 Vector: (CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N)
Covered by Rapid7
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Alpine Linux | — | Upgrade firefox-esr | Nov 8, 2019 | Jul 23, 2019 |
| Amazon Linux Ami 2 | — | Upgrade thunderbird-debuginfoUpgrade thunderbird | Apr 27, 2020 | Jul 23, 2019 |
| Arch Linux | — | Upgrade to the latest version of Arch Linux | Jul 11, 2025 | Jul 23, 2019 |
| Centos_linux | — | Upgrade thunderbirdUpgrade thunderbird-debuginfoUpgrade firefoxUpgrade thunderbird-debugsourceUpgrade firefox-debugsourceUpgrade firefox-debuginfo | Jul 16, 2019 | Jul 9, 2019 |
| Debian | — | Upgrade firefox-esrUpgrade thunderbird | Jul 15, 2019 | Jul 15, 2019 |
| Freebsd | — | Upgrade linux-firefoxUpgrade thunderbirdUpgrade firefox-esrUpgrade linux-seamonkeyUpgrade waterfoxUpgrade seamonkeyUpgrade firefoxUpgrade libxulUpgrade linux-thunderbird | Jul 11, 2019 | Jul 9, 2019 |
| Gentoo Linux | — | Upgrade mail-client/thunderbird.Upgrade www-client/firefox-bin.Upgrade mail-client/thunderbird-bin.Upgrade www-client/firefox. | Aug 16, 2019 | Jul 23, 2019 |
| Oracle Solaris | — | Upgrade mail/thunderbird/plugin/thunderbird-lightning to version 60.8.0-11.4.12.0.1.3.0 on Solaris 11.4Upgrade web/data/firefox-bookmarks to version 60.8.0-11.4.12.0.1.3.0 on Solaris 11.4Upgrade web/browser/firefox to version 60.8.0-11.4.12.0.1.3.0 on Solaris 11.4Upgrade mail/thunderbird to version 60.8.0-11.4.12.0.1.3.0 on Solaris 11.4 | Aug 21, 2019 | Jul 23, 2019 |
| Oracle_linux | — | Upgrade thunderbirdUpgrade firefox | Jul 12, 2019 | Jul 10, 2019 |
| Redhat_linux | — | Upgrade thunderbird-debugsourceUpgrade thunderbird-debuginfoUpgrade firefox-debuginfoUpgrade thunderbirdUpgrade firefoxNo solution existsUpgrade firefox-debugsource | Jul 12, 2019 | Jul 11, 2019 |
| Suse | — | Upgrade libsoftokn3Upgrade libsoftokn3-32bitUpgrade mozilla-nspr-32bitUpgrade firefox-gtk3-branding-upstreamUpgrade enigmailUpgrade MozillaThunderbird-buildsymbolsUpgrade mozillafirefox-branding-sledUpgrade libfirefox-gthread-2_0-0Upgrade firefox-libffi7Upgrade firefox-libharfbuzz0Upgrade mozillafirefox-translations-commonUpgrade firefox-gdk-pixbuf-query-loadersUpgrade mozilla-nsprUpgrade firefox-gtk3-dataUpgrade mozillafirefox-branding-sleUpgrade firefox-gtk3-immodules-tigrignaUpgrade mozilla-nssUpgrade firefox-gtk3-immodule-inuktitutUpgrade firefox-gtk3-immodule-multipressUpgrade firefox-libffi4Upgrade firefox-gtk3-immodule-vietnameseUpgrade firefox-libgtk-3-0Upgrade firefox-glib2-langUpgrade mozilla-nspr-develUpgrade mozilla-nss-sysinit-32bitUpgrade firefox-gtk3-langUpgrade firefox-gtk3-immodule-thaiUpgrade mozillathunderbird-translations-commonUpgrade mozilla-nss-sysinitUpgrade firefox-gtk3-immodule-amharicUpgrade libfirefox-gobject-2_0-0Upgrade firefox-libcairo2Upgrade firefox-libgdk_pixbuf-2_0-0Upgrade firefox-gdk-pixbuf-langUpgrade mozilla-nss-develUpgrade mozillathunderbird-translations-otherUpgrade firefox-gtk3-immodule-ximUpgrade libfirefox-gmodule-2_0-0Upgrade libfreebl3-32bitUpgrade libfreebl3-hmac-32bitUpgrade mozillafirefox-translations-otherUpgrade mozillathunderbirdUpgrade firefox-gdk-pixbuf-thumbnailerUpgrade firefox-gtk3-toolsUpgrade libfreebl3Upgrade libfreebl3-hmacUpgrade mozillafirefox-develUpgrade libfirefox-glib-2_0-0Upgrade mozilla-nss-toolsUpgrade firefox-glib2-toolsUpgrade firefox-atk-langUpgrade libfirefox-gio-2_0-0Upgrade mozillafirefoxUpgrade mozillafirefox-buildsymbolsUpgrade mozilla-nss-32bitUpgrade libsoftokn3-hmac-32bitUpgrade firefox-libpango-1_0-0Upgrade firefox-gio-branding-upstreamUpgrade mozilla-nss-certs-32bitUpgrade libsoftokn3-hmacUpgrade mozilla-nss-certsUpgrade firefox-libcairo-gobject2Upgrade mozillafirefox-branding-upstreamUpgrade firefox-libatk-1_0-0 | Jul 18, 2019 | Jul 9, 2019 |
| Ubuntu | — | Upgrade firefoxUpgrade thunderbird | Jul 13, 2019 | Jul 9, 2019 |
Prioritise with Active Threat Intelligence
With curated Threat Intelligence, you can see which vulnerabilities truly put you at risk, prioritize what matters most, and act before attackers do.
Explore Intelligence Hub