Firefox ESR and 2 others: When in an endless loop, a website specifying a custom cursor using CSS could make it look like the user…
CVE-2020-15654 is fixed in 11 products on 2 platforms, first by Mozilla Thunderbird (en-US) 78.1.0, released July 29, 2020. It is not reported as exploited. Patch Radar priority: Routine.
When in an endless loop, a website specifying a custom cursor using CSS could make it look like the user is interacting with the user interface, when they are not. This could lead to a perceived broken state, especially when interactions with existing browser dialogs and warnings do not work. This vulnerability affects Firefox ESR < 78.1, Firefox < 79, and Thunderbird < 78.1.
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) | 78.1.0 | Mozilla Thunderbird (en-US) 78.1.0 | Jul 29, 2020 |
| Linux | |||
| firefox · RHEL 8 | 0:78.2.0-2.el8_2 | RHSA-2020:3557 | Aug 26, 2020 |
| firefox · Ubuntu 18.04.6 LTS (bionic) | 79.0+build1-0ubuntu0.18.04.1 | firefox 79.0+build1-0ubuntu0.18.04.1 | Aug 10, 2020 |
| firefox · Ubuntu 20.04 LTS (focal) | 79.0+build1-0ubuntu0.20.04.1 | firefox 79.0+build1-0ubuntu0.20.04.1 | Aug 10, 2020 |
| firefox · ol 8 | 0:78.2.0-2.0.1.el8_2 | ELSA-2020-3557 | Aug 28, 2020 |
| firefox-geckodriver · Ubuntu 18.04.6 LTS (bionic) | 79.0+build1-0ubuntu0.18.04.1 | firefox-geckodriver 79.0+build1-0ubuntu0.18.04.1 | Aug 10, 2020 |
| firefox-geckodriver · Ubuntu 20.04 LTS (focal) | 79.0+build1-0ubuntu0.20.04.1 | firefox-geckodriver 79.0+build1-0ubuntu0.20.04.1 | Aug 10, 2020 |
| firefox-mozsymbols · Ubuntu 18.04.6 LTS (bionic) | 79.0+build1-0ubuntu0.18.04.1 | firefox-mozsymbols 79.0+build1-0ubuntu0.18.04.1 | Aug 10, 2020 |
| firefox-mozsymbols · Ubuntu 20.04 LTS (focal) | 79.0+build1-0ubuntu0.20.04.1 | firefox-mozsymbols 79.0+build1-0ubuntu0.20.04.1 | Aug 10, 2020 |
| thunderbird · Ubuntu 18.04.6 LTS (bionic) | 1:78.8.1+build1-0ubuntu0.18.04.1 | thunderbird 1:78.8.1+build1-0ubuntu0.18.04.1 | Apr 22, 2021 |
| thunderbird · Ubuntu 20.04 LTS (focal) | 1:78.7.1+build1-0ubuntu0.20.04.1 | thunderbird 1:78.7.1+build1-0ubuntu0.20.04.1 | Jan 25, 2021 |
| thunderbird-gnome-support · Ubuntu 18.04.6 LTS (bionic) | 1:78.8.1+build1-0ubuntu0.18.04.1 | thunderbird-gnome-support 1:78.8.1+build1-0ubuntu0.18.04.1 | Apr 22, 2021 |
| thunderbird-gnome-support · Ubuntu 20.04 LTS (focal) | 1:78.7.1+build1-0ubuntu0.20.04.1 | thunderbird-gnome-support 1:78.7.1+build1-0ubuntu0.20.04.1 | Jan 25, 2021 |
| thunderbird-mozsymbols · Ubuntu 18.04.6 LTS (bionic) | 1:78.8.1+build1-0ubuntu0.18.04.1 | thunderbird-mozsymbols 1:78.8.1+build1-0ubuntu0.18.04.1 | Apr 22, 2021 |
| thunderbird-mozsymbols · Ubuntu 20.04 LTS (focal) | 1:78.7.1+build1-0ubuntu0.20.04.1 | thunderbird-mozsymbols 1:78.7.1+build1-0ubuntu0.20.04.1 | Jan 25, 2021 |
| xul-ext-calendar-timezones · Ubuntu 18.04.6 LTS (bionic) | 1:78.8.1+build1-0ubuntu0.18.04.1 | xul-ext-calendar-timezones 1:78.8.1+build1-0ubuntu0.18.04.1 | Apr 22, 2021 |
| xul-ext-calendar-timezones · Ubuntu 20.04 LTS (focal) | 1:78.7.1+build1-0ubuntu0.20.04.1 | xul-ext-calendar-timezones 1:78.7.1+build1-0ubuntu0.20.04.1 | Jan 25, 2021 |
| xul-ext-gdata-provider · Ubuntu 18.04.6 LTS (bionic) | 1:78.8.1+build1-0ubuntu0.18.04.1 | xul-ext-gdata-provider 1:78.8.1+build1-0ubuntu0.18.04.1 | Apr 22, 2021 |
| xul-ext-gdata-provider · Ubuntu 20.04 LTS (focal) | 1:78.7.1+build1-0ubuntu0.20.04.1 | xul-ext-gdata-provider 1:78.7.1+build1-0ubuntu0.20.04.1 | Jan 25, 2021 |
| xul-ext-lightning · Ubuntu 18.04.6 LTS (bionic) | 1:78.8.1+build1-0ubuntu0.18.04.1 | xul-ext-lightning 1:78.8.1+build1-0ubuntu0.18.04.1 | Apr 22, 2021 |
| xul-ext-lightning · Ubuntu 20.04 LTS (focal) | 1:78.7.1+build1-0ubuntu0.20.04.1 | xul-ext-lightning 1:78.7.1+build1-0ubuntu0.20.04.1 | Jan 25, 2021 |
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