File downloads encoded with "blob:" and "data:" URL elements bypassed normal file download checks though the Phishing and Malware Protection feature and its block lists of suspicious sites and files. This would allow malicious sites to lure users into downloading executables that would otherwise be detected as suspicious. This vulnerability affects Firefox < 56, Firefox ESR < 52.4, and Thunderbird < 52.4.
CVSS Details
- CVSS 3.1 Base Score: 7.8
- CVSS 3.0 Vector: (CVSS:3.0/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H)
Covered by Rapid7
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Alpine Linux | — | Upgrade firefox-esr | Dec 1, 2017 | Oct 25, 2017 |
| Arch Linux | — | Upgrade to the latest version of Arch Linux | Jul 11, 2025 | Jun 11, 2018 |
| Centos_linux | — | Upgrade thunderbirdUpgrade firefoxUpgrade thunderbird-debuginfoUpgrade firefox-debuginfo | Oct 2, 2017 | Sep 29, 2017 |
| Debian | — | Upgrade firefox-esrUpgrade thunderbird | Sep 30, 2017 | Sep 29, 2017 |
| Freebsd | — | Upgrade linux-thunderbirdUpgrade libxulUpgrade thunderbirdUpgrade firefoxUpgrade linux-firefoxUpgrade linux-seamonkeyUpgrade seamonkeyUpgrade firefox-esr | Sep 29, 2017 | Sep 29, 2017 |
| Gentoo Linux | — | Upgrade www-client/firefox.Upgrade www-client/firefox-bin.Upgrade mail-client/thunderbird.Upgrade mail-client/thunderbird-bin. | Feb 20, 2018 | Feb 20, 2018 |
| Mfsa2017 21 | — | Upgrade to the latest version of Mozilla FirefoxUpgrade to Mozilla Firefox version 56.0 | Jul 12, 2018 | Jun 11, 2018 |
| Mfsa2017 22 | — | Upgrade to the latest version of Mozilla FirefoxUpgrade to Mozilla Firefox ESR version 52.4 | Sep 29, 2017 | Sep 28, 2017 |
| Mozilla Thunderbird | — | Upgrade to the latest version of Mozilla ThunderbirdUpgrade to Mozilla Thunderbird version 52.4 | Oct 11, 2017 | Oct 9, 2017 |
| Oracle Solaris | — | Upgrade mail/thunderbird/plugin/thunderbird-lightning to version 52.4.0-0.175.3.26.0.4.0 on Solaris 11.3Upgrade web/browser/firefox/plugin/firefox-java to version 52.4.0-0.175.3.25.0.3.0 on Solaris 11.3Upgrade web/browser/firefox to version 52.4.0-0.175.3.25.0.3.0 on Solaris 11.3Upgrade web/data/firefox-bookmarks to version 52.4.0-0.175.3.25.0.3.0 on Solaris 11.3Upgrade mail/thunderbird to version 52.4.0-0.175.3.26.0.4.0 on Solaris 11.3 | Nov 30, 2017 | Nov 30, 2017 |
| Oracle_linux | — | Upgrade firefoxUpgrade thunderbird | Sep 29, 2017 | Sep 28, 2017 |
| Redhat_linux | — | Upgrade firefox-debuginfoUpgrade thunderbird-debuginfoUpgrade thunderbirdUpgrade firefox | Oct 4, 2017 | Sep 29, 2017 |
| Suse | — | Upgrade libsoftokn3-32bitUpgrade libfreebl3Upgrade libfreebl3-32bitUpgrade mozilla-nss-sysinit-32bitUpgrade MozillaFirefoxUpgrade mozilla-nss-32bitUpgrade MozillaFirefox-translations-commonUpgrade mozilla-nss-x86Upgrade libsoftokn3-x86Upgrade MozillaThunderbird-buildsymbolsUpgrade MozillaFirefox-translationsUpgrade libfreebl3-hmacUpgrade mozilla-nss-sysinitUpgrade libfreebl3-x86Upgrade mozilla-nss-develUpgrade mozilla-nssUpgrade libfreebl3-hmac-32bitUpgrade mozilla-nss-toolsUpgrade mozilla-nss-certsUpgrade libsoftokn3Upgrade libsoftokn3-hmac-32bitUpgrade MozillaFirefox-translations-otherUpgrade MozillaThunderbirdUpgrade libsoftokn3-hmacUpgrade MozillaThunderbird-translations-commonUpgrade MozillaThunderbird-develUpgrade MozillaFirefox-develUpgrade MozillaThunderbird-translations-otherUpgrade mozilla-nss-certs-32bit | Oct 2, 2017 | Sep 29, 2017 |
| Ubuntu | — | Upgrade firefoxUpgrade thunderbird | Oct 3, 2017 | Sep 29, 2017 |
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