As specified in the W3C Content Security Policy draft, when...
Vulnerability 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.
Impact Analysis
Refer to official advisory for detailed impact metrics.
Remediation
Ensure systems are updated to the latest vendor-supplied patch levels.
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Credits & Attribution
No credits recorded in the NVD database.
References
- https://www.mozilla.org/security/advisories/mfsa2021-07/
- https://www.mozilla.org/security/advisories/mfsa2021-09/
- https://www.mozilla.org/security/advisories/mfsa2021-08/
- https://bugzilla.mozilla.org/show_bug.cgi?id=1542194
- https://lists.debian.org/debian-lts-announce/2021/03/msg00000.html
- https://www.debian.org/security/2021/dsa-4866
- https://security.gentoo.org/glsa/202104-10
- https://security.gentoo.org/glsa/202104-09
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Mozilla
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Timeline
CVSS Vectors
Weaknesses (CWE)
No CWE data available
MITRE ATT&CK TTPs
No associated TTPs found for this vulnerability.