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CVE-2021-23969

Public on 2021-02-26
Modified on 2021-03-19
Description

As specified in the W3C Content Security Policy draft, when creating a violation report, "User agents need to ensure that the source file is the URL requested by the page, pre-redirects. If that's not possible, user agents need to strip the URL down to an origin to avoid unintentional leakage." Under certain types of redirects, Firefox incorrectly set the source file to be the destination of the redirects. This was fixed to be the redirect destination's origin. This vulnerability affects Firefox < 86, Thunderbird < 78.8, and Firefox ESR < 78.8.

Severity
Important
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CVSS v3 Base Score
4.3
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Affected Packages

Platform Package Release Date Advisory
Amazon Linux 2 - Core thunderbird 2021-03-18 01:13 ALAS2-2021-1618

CVSS Scores

Score Type Score Vector
Amazon Linux CVSSv3 4.3 CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N
NVD CVSSv2 4.3 AV:N/AC:M/Au:N/C:P/I:N/A:N
NVD CVSSv3 4.3 CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N

References

Red Hat: CVE-2021-23969 Mitre: CVE-2021-23969 FAQs regarding Amazon Linux ALAS/CVE Severity