Firefox ESR: When protecting CSS blocks with the nonce feature of Content Security Policy, the @import statement in…
CVE-2020-6813 is fixed in 4 products on 2 platforms, first by firefox 74.0+build3-0ubuntu0.18.04.1, released March 10, 2020. It is not reported as exploited. Patch Radar priority: Routine.
When protecting CSS blocks with the nonce feature of Content Security Policy, the @import statement in the CSS block could allow an attacker to inject arbitrary styles, bypassing the intent of the Content Security Policy. This vulnerability affects Firefox < 74.
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 · Ubuntu 18.04.6 LTS (bionic) | 74.0+build3-0ubuntu0.18.04.1 | firefox 74.0+build3-0ubuntu0.18.04.1 | Mar 10, 2020 |
| firefox · Ubuntu 20.04 LTS (focal) | 74.0+build3-0ubuntu1 | firefox 74.0+build3-0ubuntu1 | Mar 10, 2020 |
| firefox-geckodriver · Ubuntu 18.04.6 LTS (bionic) | 74.0+build3-0ubuntu0.18.04.1 | firefox-geckodriver 74.0+build3-0ubuntu0.18.04.1 | Mar 10, 2020 |
| firefox-geckodriver · Ubuntu 20.04 LTS (focal) | 74.0+build3-0ubuntu1 | firefox-geckodriver 74.0+build3-0ubuntu1 | Mar 10, 2020 |
| firefox-mozsymbols · Ubuntu 18.04.6 LTS (bionic) | 74.0+build3-0ubuntu0.18.04.1 | firefox-mozsymbols 74.0+build3-0ubuntu0.18.04.1 | Mar 10, 2020 |
| firefox-mozsymbols · Ubuntu 20.04 LTS (focal) | 74.0+build3-0ubuntu1 | firefox-mozsymbols 74.0+build3-0ubuntu1 | Mar 10, 2020 |
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