In the Windows 10 April 2018 Update, Windows Defender SmartScreen honors the "SEE_MASK_FLAG_NO_UI" flag associated with downloaded files and will not show any UI. Files that are unknown and potentially dangerous will be allowed to run because SmartScreen will not prompt the user for a decision, and if the user is offline all files will be allowed to be opened because Windows won't prompt the user to ask what to do. Firefox incorrectly sets this flag when downloading files, leading to less secure behavior from SmartScreen. Note: this issue only affects Windows 10 users running the April 2018 update or later. It does not affect other Windows users or other operating systems. This vulnerability affects Thunderbird < 52.8, Thunderbird ESR < 52.8, Firefox < 60, and Firefox ESR < 52.8.
CVSS Details
- CVSS 3.1 Base Score: 7.5
- CVSS 3.0 Vector: (CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N)
Covered by Rapid7
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Freebsd | freebsd-upgrade-package-firefoxfreebsd-upgrade-package-waterfoxfreebsd-upgrade-package-seamonkeyfreebsd-upgrade-package-linux-seamonkeyfreebsd-upgrade-package-firefox-esrfreebsd-upgrade-package-linux-firefoxfreebsd-upgrade-package-libxulfreebsd-upgrade-package-thunderbirdfreebsd-upgrade-package-linux-thunderbird | May 10, 2018 | May 9, 2018 | |
| Mfsa2018 11 | mozilla-firefox-upgrade-60_0 | May 10, 2018 | May 9, 2018 | |
| Mfsa2018 12 | mozilla-firefox-esr-upgrade-52_8 | May 10, 2018 | May 9, 2018 | |
| Mozilla Thunderbird | mozilla-thunderbird-upgrade-52_8 | May 22, 2018 | May 18, 2018 | |
| Oracle Solaris | oracle-solaris-11-3-upgrade-mail-thunderbird-52-8-0-0-175-3-33-0-4-0oracle-solaris-11-3-upgrade-mail-thunderbird-plugin-thunderbird-lightning-52-8-0-0-175-3-33-0-4-0oracle-solaris-11-3-upgrade-web-browser-firefox-52-8-0-0-175-3-33-0-4-0oracle-solaris-11-3-upgrade-web-browser-firefox-plugin-firefox-java-52-8-0-0-175-3-33-0-4-0oracle-solaris-11-3-upgrade-web-data-firefox-bookmarks-52-8-0-0-175-3-33-0-4-0 | Jun 18, 2018 | Jun 11, 2018 | |
| Suse | — | suse-upgrade-mozillafirefoxsuse-upgrade-mozillafirefox-develsuse-upgrade-mozillafirefox-translationssuse-upgrade-mozillafirefox-translations-commonsuse-upgrade-mozillafirefox-translations-othersuse-upgrade-mozillathunderbirdsuse-upgrade-mozillathunderbird-buildsymbolssuse-upgrade-mozillathunderbird-develsuse-upgrade-mozillathunderbird-translations-commonsuse-upgrade-mozillathunderbird-translations-other | May 17, 2018 | May 9, 2018 |
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