CVE-2021-23969 Information

Description

As specified in the W3C Content Security Policy draft when creating a violation report �ser 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.

CVSS Vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N

Reference

https://bugzilla.mozilla.org/show_bug.cgi?id=1542194 https://www.mozilla.org/security/advisories/mfsa2021-08/ https://www.mozilla.org/security/advisories/mfsa2021-09/ https://www.mozilla.org/security/advisories/mfsa2021-07/ https://lists.debian.org/debian-lts-announce/2021/03/msg00000.html https://www.debian.org/security/2021/dsa-4866 https://security.gentoo.org/glsa/202104-09 https://security.gentoo.org/glsa/202104-10

Attack Complexity

LOW

Privileges Required

NONE

User Interaction Required

NONE

Scope

REQUIRED

Confidentiality Impact

UNCHANGED

Integrity Impact

LOW

Availability Impact

NONE

Base Score

NONE

Base Severity

4.3