Firefox ESR and 2 others: A malicious extension could have opened a popup window lacking an address bar.
CVE-2021-23984 is fixed in 11 products on 2 platforms, first by firefox 87.0+build3-0ubuntu0.20.04.2, released March 24, 2021. It is not reported as exploited. Patch Radar priority: Routine.
A malicious extension could have opened a popup window lacking an address bar. The title of the popup lacking an address bar should not be fully controllable, but in this situation was. This could have been used to spoof a website and attempt to trick the user into providing credentials. This vulnerability affects Firefox ESR < 78.9, Firefox < 87, and Thunderbird < 78.9.
Where it's fixed
| Product | Fixed in | Fix | Released |
|---|---|---|---|
| Windows apps | |||
| Mozilla Firefox ESR (en-US) | 91.0 | Mozilla Firefox ESR (en-US) 91.0 | Aug 4, 2021 |
| Mozilla Thunderbird (en-US) | 78.10.0 | Mozilla Thunderbird (en-US) 78.10.0 | Apr 15, 2021 |
| Linux | |||
| firefox · RHEL 8 | 0:78.9.0-1.el8_3 | RHSA-2021:0990 | Mar 25, 2021 |
| firefox · Ubuntu 18.04.6 LTS (bionic) | 87.0+build3-0ubuntu0.18.04.2 | firefox 87.0+build3-0ubuntu0.18.04.2 | Jun 24, 2021 |
| firefox · Ubuntu 20.04 LTS (focal) | 87.0+build3-0ubuntu0.20.04.2 | firefox 87.0+build3-0ubuntu0.20.04.2 | Mar 24, 2021 |
| firefox · ol 8 | 0:78.9.0-1.0.1.el8_3 | ELSA-2021-0990 | Mar 26, 2021 |
| firefox-geckodriver · Ubuntu 18.04.6 LTS (bionic) | 87.0+build3-0ubuntu0.18.04.2 | firefox-geckodriver 87.0+build3-0ubuntu0.18.04.2 | Jun 24, 2021 |
| firefox-geckodriver · Ubuntu 20.04 LTS (focal) | 87.0+build3-0ubuntu0.20.04.2 | firefox-geckodriver 87.0+build3-0ubuntu0.20.04.2 | Mar 24, 2021 |
| firefox-mozsymbols · Ubuntu 18.04.6 LTS (bionic) | 87.0+build3-0ubuntu0.18.04.2 | firefox-mozsymbols 87.0+build3-0ubuntu0.18.04.2 | Jun 24, 2021 |
| firefox-mozsymbols · Ubuntu 20.04 LTS (focal) | 87.0+build3-0ubuntu0.20.04.2 | firefox-mozsymbols 87.0+build3-0ubuntu0.20.04.2 | Mar 24, 2021 |
| thunderbird · RHEL 8 | 0:78.9.0-3.el8_3 | RHSA-2021:0993 | Mar 25, 2021 |
| thunderbird · Ubuntu 18.04.6 LTS (bionic) | 1:78.11.0+build1-0ubuntu0.18.04.2 | thunderbird 1:78.11.0+build1-0ubuntu0.18.04.2 | Jun 1, 2021 |
| thunderbird · Ubuntu 20.04 LTS (focal) | 1:78.11.0+build1-0ubuntu0.20.04.2 | thunderbird 1:78.11.0+build1-0ubuntu0.20.04.2 | Jun 1, 2021 |
| thunderbird · ol 8 | 0:78.9.0-3.0.1.el8_3 | ELSA-2021-0993 | Mar 26, 2021 |
| thunderbird-gnome-support · Ubuntu 18.04.6 LTS (bionic) | 1:78.11.0+build1-0ubuntu0.18.04.2 | thunderbird-gnome-support 1:78.11.0+build1-0ubuntu0.18.04.2 | Jun 1, 2021 |
| thunderbird-gnome-support · Ubuntu 20.04 LTS (focal) | 1:78.11.0+build1-0ubuntu0.20.04.2 | thunderbird-gnome-support 1:78.11.0+build1-0ubuntu0.20.04.2 | Jun 1, 2021 |
| thunderbird-mozsymbols · Ubuntu 18.04.6 LTS (bionic) | 1:78.11.0+build1-0ubuntu0.18.04.2 | thunderbird-mozsymbols 1:78.11.0+build1-0ubuntu0.18.04.2 | Jun 1, 2021 |
| thunderbird-mozsymbols · Ubuntu 20.04 LTS (focal) | 1:78.11.0+build1-0ubuntu0.20.04.2 | thunderbird-mozsymbols 1:78.11.0+build1-0ubuntu0.20.04.2 | Jun 1, 2021 |
| xul-ext-calendar-timezones · Ubuntu 18.04.6 LTS (bionic) | 1:78.11.0+build1-0ubuntu0.18.04.2 | xul-ext-calendar-timezones 1:78.11.0+build1-0ubuntu0.18.04.2 | Jun 1, 2021 |
| xul-ext-calendar-timezones · Ubuntu 20.04 LTS (focal) | 1:78.11.0+build1-0ubuntu0.20.04.2 | xul-ext-calendar-timezones 1:78.11.0+build1-0ubuntu0.20.04.2 | Jun 1, 2021 |
| xul-ext-gdata-provider · Ubuntu 18.04.6 LTS (bionic) | 1:78.11.0+build1-0ubuntu0.18.04.2 | xul-ext-gdata-provider 1:78.11.0+build1-0ubuntu0.18.04.2 | Jun 1, 2021 |
| xul-ext-gdata-provider · Ubuntu 20.04 LTS (focal) | 1:78.11.0+build1-0ubuntu0.20.04.2 | xul-ext-gdata-provider 1:78.11.0+build1-0ubuntu0.20.04.2 | Jun 1, 2021 |
| xul-ext-lightning · Ubuntu 18.04.6 LTS (bionic) | 1:78.11.0+build1-0ubuntu0.18.04.2 | xul-ext-lightning 1:78.11.0+build1-0ubuntu0.18.04.2 | Jun 1, 2021 |
| xul-ext-lightning · Ubuntu 20.04 LTS (focal) | 1:78.11.0+build1-0ubuntu0.20.04.2 | xul-ext-lightning 1:78.11.0+build1-0ubuntu0.20.04.2 | Jun 1, 2021 |
Patch Radar data is free to use with attribution. Terms and how to credit it.
Product names, logos and trademarks shown on Patch Radar belong to their respective owners. They are used only to identify the software each security fix applies to and to help readers find their platform. Their use does not imply any affiliation with, or endorsement by, those owners, and Patchblox is not affiliated with any of them.