Firefox ESR and 2 others: The code for downloading files did not properly take care of special characters, which led to an attacker…
CVE-2020-15658 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.
The code for downloading files did not properly take care of special characters, which led to an attacker being able to cut off the file ending at an earlier position, leading to a different file type being downloaded than shown in the dialog. 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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