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Vulnerability Details : CVE-2021-23969

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.
Publish Date : 2021-02-26 Last Update Date : 2021-05-01
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- CVSS Scores & Vulnerability Types

CVSS Score
4.3
Confidentiality Impact Partial (There is considerable informational disclosure.)
Integrity Impact None (There is no impact to the integrity of the system)
Availability Impact None (There is no impact to the availability of the system.)
Access Complexity Medium (The access conditions are somewhat specialized. Some preconditions must be satistified to exploit)
Authentication Not required (Authentication is not required to exploit the vulnerability.)
Gained Access None
Vulnerability Type(s)
CWE ID CWE id is not defined for this vulnerability

- Related OVAL Definitions

Title Definition Id Class Family
RHSA-2021:0655: firefox security update (Critical) oval:com.redhat.rhsa:def:20210655 unix
RHSA-2021:0656: firefox security update (Critical) oval:com.redhat.rhsa:def:20210656 unix
RHSA-2021:0657: thunderbird security update (Important) oval:com.redhat.rhsa:def:20210657 unix
RHSA-2021:0661: thunderbird security update (Important) oval:com.redhat.rhsa:def:20210661 unix
OVAL (Open Vulnerability and Assessment Language) definitions define exactly what should be done to verify a vulnerability or a missing patch. Check out the OVAL definitions if you want to learn what you should do to verify a vulnerability.

- Products Affected By CVE-2021-23969

# Product Type Vendor Product Version Update Edition Language
1 OS Debian Debian Linux 9.0 * * * Version Details Vulnerabilities
2 OS Debian Debian Linux 10.0 * * * Version Details Vulnerabilities
3 Application Mozilla Firefox * * * * Version Details Vulnerabilities
4 Application Mozilla Firefox Esr * * * * Version Details Vulnerabilities
5 Application Mozilla Thunderbird * * * * Version Details Vulnerabilities

- Number Of Affected Versions By Product

Vendor Product Vulnerable Versions
Debian Debian Linux 2
Mozilla Firefox 1
Mozilla Firefox Esr 1
Mozilla Thunderbird 1

- References For CVE-2021-23969

https://security.gentoo.org/glsa/202104-10
GENTOO GLSA-202104-10
https://www.debian.org/security/2021/dsa-4866
DEBIAN DSA-4866
https://security.gentoo.org/glsa/202104-09
GENTOO GLSA-202104-09
https://lists.debian.org/debian-lts-announce/2021/03/msg00000.html
MLIST [debian-lts-announce] 20210301 [SECURITY] [DLA 2578-1] thunderbird security update
https://www.mozilla.org/security/advisories/mfsa2021-09/
https://www.mozilla.org/security/advisories/mfsa2021-07/
https://www.mozilla.org/security/advisories/mfsa2021-08/
https://bugzilla.mozilla.org/show_bug.cgi?id=1542194

- Metasploit Modules Related To CVE-2021-23969

There are not any metasploit modules related to this CVE entry (Please visit www.metasploit.com for more information)


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