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 firefox-debugsourceUpgrade thunderbird-debugsourceUpgrade firefoxUpgrade thunderbird-debuginfoUpgrade firefox-debuginfo | Jul 16, 2019 | Jul 9, 2019 |
| Debian | — | Upgrade thunderbirdUpgrade firefox-esr | Jul 15, 2019 | Jul 15, 2019 |
| Freebsd | — | Upgrade libxulUpgrade linux-thunderbirdUpgrade seamonkeyUpgrade thunderbirdUpgrade linux-firefoxUpgrade waterfoxUpgrade firefox-esrUpgrade linux-seamonkeyUpgrade firefox | Jul 11, 2019 | Jul 9, 2019 |
| Gentoo Linux | — | Upgrade mail-client/thunderbird-bin.Upgrade mail-client/thunderbird.Upgrade www-client/firefox-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 thunderbirdUpgrade thunderbird-debuginfoUpgrade firefox-debuginfoUpgrade thunderbird-debugsourceUpgrade firefoxNo solution existsUpgrade firefox-debugsource | Jul 12, 2019 | Jul 11, 2019 |
| Suse | — | Upgrade mozilla-nsprUpgrade mozillafirefox-branding-sledUpgrade firefox-gtk3-langUpgrade firefox-gtk3-immodule-inuktitutUpgrade firefox-gdk-pixbuf-query-loadersUpgrade enigmailUpgrade mozilla-nspr-32bitUpgrade mozillathunderbird-translations-commonUpgrade mozillafirefox-branding-sleUpgrade firefox-gtk3-branding-upstreamUpgrade libfirefox-gthread-2_0-0Upgrade firefox-gtk3-immodule-vietnameseUpgrade firefox-libharfbuzz0Upgrade libsoftokn3Upgrade firefox-gtk3-immodule-multipressUpgrade mozilla-nss-sysinitUpgrade firefox-gtk3-immodules-tigrignaUpgrade mozilla-nss-sysinit-32bitUpgrade libsoftokn3-32bitUpgrade mozilla-nspr-develUpgrade firefox-gtk3-immodule-thaiUpgrade firefox-libffi4Upgrade mozilla-nssUpgrade MozillaThunderbird-buildsymbolsUpgrade firefox-gtk3-dataUpgrade mozillafirefox-translations-commonUpgrade firefox-libffi7Upgrade firefox-glib2-langUpgrade firefox-libgtk-3-0Upgrade firefox-gtk3-immodule-ximUpgrade libfreebl3Upgrade firefox-gdk-pixbuf-thumbnailerUpgrade libfreebl3-hmac-32bitUpgrade firefox-gdk-pixbuf-langUpgrade firefox-glib2-toolsUpgrade mozillafirefox-translations-otherUpgrade firefox-libcairo-gobject2Upgrade mozillafirefox-develUpgrade firefox-libpango-1_0-0Upgrade firefox-gtk3-immodule-amharicUpgrade libfreebl3-32bitUpgrade libfirefox-gmodule-2_0-0Upgrade libfirefox-gobject-2_0-0Upgrade mozillafirefox-buildsymbolsUpgrade firefox-libatk-1_0-0Upgrade firefox-libcairo2Upgrade mozilla-nss-develUpgrade mozillathunderbird-translations-otherUpgrade firefox-gio-branding-upstreamUpgrade libfreebl3-hmacUpgrade mozilla-nss-certs-32bitUpgrade mozilla-nss-32bitUpgrade libsoftokn3-hmac-32bitUpgrade mozillathunderbirdUpgrade firefox-gtk3-toolsUpgrade libfirefox-glib-2_0-0Upgrade mozilla-nss-certsUpgrade libfirefox-gio-2_0-0Upgrade firefox-atk-langUpgrade mozilla-nss-toolsUpgrade mozillafirefox-branding-upstreamUpgrade libsoftokn3-hmacUpgrade mozillafirefoxUpgrade firefox-libgdk_pixbuf-2_0-0 | Jul 18, 2019 | Jul 9, 2019 |
| Ubuntu | — | Upgrade firefoxUpgrade thunderbird | Jul 13, 2019 | Jul 9, 2019 |
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