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Ubuntu: USN-4893-1 (CVE-2021-23986): Firefox vulnerabilities

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Ubuntu: USN-4893-1 (CVE-2021-23986): Firefox vulnerabilities

Severity
4
CVSS
(AV:N/AC:M/Au:N/C:P/I:N/A:N)
Published
03/25/2021
Created
03/30/2021
Added
03/26/2021
Modified
03/22/2023

Description

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.

Solution(s)

  • ubuntu-upgrade-firefox

References

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