Firefox ESR: When reading from areas partially or fully outside the source resource with WebGL's <code>copyTexSubImage</code>…
CVE-2020-6821 is fixed in 10 products on 2 platforms, first by firefox 75.0+build3-0ubuntu0.18.04.1, released April 6, 2020. It is not reported as exploited. Patch Radar priority: High.
When reading from areas partially or fully outside the source resource with WebGL's <code>copyTexSubImage</code> method, the specification requires the returned values be zero. Previously, this memory was uninitialized, leading to potentially sensitive data disclosure. This vulnerability affects Thunderbird < 68.7.0, Firefox ESR < 68.7, and Firefox < 75.
Where it's fixed
| Product | Fixed in | Fix | Released |
|---|---|---|---|
| Windows apps | |||
| Mozilla Firefox ESR (en-US) | 78.0esr | Mozilla Firefox ESR (en-US) 78.0esr | Jun 25, 2020 |
| Linux | |||
| firefox · RHEL 8 | 0:68.7.0-2.el8_1 | RHSA-2020:1406 | Apr 8, 2020 |
| firefox · Ubuntu 18.04.6 LTS (bionic) | 75.0+build3-0ubuntu0.18.04.1 | firefox 75.0+build3-0ubuntu0.18.04.1 | Apr 6, 2020 |
| firefox · Ubuntu 20.04 LTS (focal) | 75.0+build3-0ubuntu1 | firefox 75.0+build3-0ubuntu1 | Apr 6, 2020 |
| firefox · ol 8 | 0:68.7.0-2.0.1.el8_1 | ELSA-2020-1406 | Apr 9, 2020 |
| firefox-geckodriver · Ubuntu 18.04.6 LTS (bionic) | 75.0+build3-0ubuntu0.18.04.1 | firefox-geckodriver 75.0+build3-0ubuntu0.18.04.1 | Apr 6, 2020 |
| firefox-geckodriver · Ubuntu 20.04 LTS (focal) | 75.0+build3-0ubuntu1 | firefox-geckodriver 75.0+build3-0ubuntu1 | Apr 6, 2020 |
| firefox-mozsymbols · Ubuntu 18.04.6 LTS (bionic) | 75.0+build3-0ubuntu0.18.04.1 | firefox-mozsymbols 75.0+build3-0ubuntu0.18.04.1 | Apr 6, 2020 |
| firefox-mozsymbols · Ubuntu 20.04 LTS (focal) | 75.0+build3-0ubuntu1 | firefox-mozsymbols 75.0+build3-0ubuntu1 | Apr 6, 2020 |
| thunderbird · RHEL 8 | 0:68.7.0-1.el8_1 | RHSA-2020:1495 | Apr 16, 2020 |
| thunderbird · Ubuntu 18.04.6 LTS (bionic) | 1:68.7.0+build1-0ubuntu0.18.04.1 | thunderbird 1:68.7.0+build1-0ubuntu0.18.04.1 | Apr 6, 2020 |
| thunderbird · Ubuntu 20.04 LTS (focal) | 1:68.7.0+build1-0ubuntu1 | thunderbird 1:68.7.0+build1-0ubuntu1 | Apr 6, 2020 |
| thunderbird · ol 8 | 0:68.7.0-1.0.1.el8_1 | ELSA-2020-1495 | Apr 18, 2020 |
| thunderbird-gnome-support · Ubuntu 18.04.6 LTS (bionic) | 1:68.7.0+build1-0ubuntu0.18.04.1 | thunderbird-gnome-support 1:68.7.0+build1-0ubuntu0.18.04.1 | Apr 6, 2020 |
| thunderbird-gnome-support · Ubuntu 20.04 LTS (focal) | 1:68.7.0+build1-0ubuntu1 | thunderbird-gnome-support 1:68.7.0+build1-0ubuntu1 | Apr 6, 2020 |
| thunderbird-mozsymbols · Ubuntu 18.04.6 LTS (bionic) | 1:68.7.0+build1-0ubuntu0.18.04.1 | thunderbird-mozsymbols 1:68.7.0+build1-0ubuntu0.18.04.1 | Apr 6, 2020 |
| thunderbird-mozsymbols · Ubuntu 20.04 LTS (focal) | 1:68.7.0+build1-0ubuntu1 | thunderbird-mozsymbols 1:68.7.0+build1-0ubuntu1 | Apr 6, 2020 |
| xul-ext-calendar-timezones · Ubuntu 18.04.6 LTS (bionic) | 1:68.7.0+build1-0ubuntu0.18.04.1 | xul-ext-calendar-timezones 1:68.7.0+build1-0ubuntu0.18.04.1 | Apr 6, 2020 |
| xul-ext-calendar-timezones · Ubuntu 20.04 LTS (focal) | 1:68.7.0+build1-0ubuntu1 | xul-ext-calendar-timezones 1:68.7.0+build1-0ubuntu1 | Apr 6, 2020 |
| xul-ext-gdata-provider · Ubuntu 18.04.6 LTS (bionic) | 1:68.7.0+build1-0ubuntu0.18.04.1 | xul-ext-gdata-provider 1:68.7.0+build1-0ubuntu0.18.04.1 | Apr 6, 2020 |
| xul-ext-gdata-provider · Ubuntu 20.04 LTS (focal) | 1:68.7.0+build1-0ubuntu1 | xul-ext-gdata-provider 1:68.7.0+build1-0ubuntu1 | Apr 6, 2020 |
| xul-ext-lightning · Ubuntu 18.04.6 LTS (bionic) | 1:68.7.0+build1-0ubuntu0.18.04.1 | xul-ext-lightning 1:68.7.0+build1-0ubuntu0.18.04.1 | Apr 6, 2020 |
| xul-ext-lightning · Ubuntu 20.04 LTS (focal) | 1:68.7.0+build1-0ubuntu1 | xul-ext-lightning 1:68.7.0+build1-0ubuntu1 | Apr 6, 2020 |
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