Firefox ESR and 1 other: A malicious extension with the 'search' permission could have installed a new search engine whose favicon…
CVE-2021-23986 is fixed in 4 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 with the 'search' permission could have installed a new search engine whose favicon referenced a cross-origin URL. The response to this cross-origin request could have been read by the extension, allowing a same-origin policy bypass by the extension, which should not have cross-origin permissions. This cross-origin request was made without cookies, so the sensitive information disclosed by the violation was limited to local-network resources or resources that perform IP-based authentication. This vulnerability affects Firefox < 87.
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 |
| Linux | |||
| 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-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 |
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