Spoofing attack in Mozilla Firefox - CVE-2021-23972

Vulnerability identifier: #VU50886

CSH Severity: Low

CVSS v4: 5.1 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N]

CVE-ID: CVE-2021-23972

CWE-ID: CWE-451

Exploitation vector: Remote access

Exploit availability: No public exploit available

The vulnerability allows a remote attacker to perform spoofing attack.

The vulnerability exists due to incorrect processing of cached redirects with HTTP authentication. A remote attacker can force the browser not to display a phishing warning dialog, if the malicious website was previously cached by the browser.

Mozilla Firefox
Gentoo Linux
Ubuntu
openEuler
firefox
firefox-debuginfo
firefox-debugsource
mozilla-crashreporter-firefox-debuginfo
firefox (Ubuntu package)

Install updates from vendor's website.

Mozilla Firefox - update to 86.0
firefox - update to 79.0-32
firefox-debuginfo - update to 79.0-32
firefox-debugsource - update to 79.0-32
mozilla-crashreporter-firefox-debuginfo - update to 79.0-32
firefox (Ubuntu package) - addressed in versions 86.0+build3-0ubuntu0.16.04.1, 86.0+build3-0ubuntu0.18.04.1, 86.0+build3-0ubuntu0.20.04.1, 86.0+build3-0ubuntu0.20.10.1

• https://www.mozilla.org/en-US/security/advisories/mfsa2021-07/

• Multiple vulnerabilities in Mozilla Firefox and Firefox ESR
• Gentoo update for Mozilla Firefox
• Ubuntu update for firefox
• openEuler 20.03 LTS SP4 update for firefox