Security features bypass in Mozilla Firefox - CVE-2023-34415

Vulnerability identifier: #VU77003

CSH Severity: Medium

CVSS v4: 2.1 [CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:A/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N]

CVE-ID: CVE-2023-34415

CWE-ID: CWE-254

Exploitation vector: Remote access

Exploit availability: No public exploit available

The vulnerability allows a remote attacker to bypass implemented security restrictions.

The vulnerability exists due to the way Firefox loads documents from a "data:" URL that was the result of a redirect. A remote attacker can trick the victim to open a specially crafted URL and bypass site-isolation protections against Spectre-like attacks.

Mozilla Firefox
Gentoo Linux
Ubuntu
openEuler
www-client/firefox
firefox (Ubuntu package)
firefox
firefox-debuginfo
firefox-debugsource

Install updates from vendor's website.

Mozilla Firefox - update to 114.0
www-client/firefox - update to 104
firefox (Ubuntu package) - addressed in versions 114.0+build3-0ubuntu0.20.04.1, 114.0.1+build1-0ubuntu0.20.04.1, 114.0.2+build1-0ubuntu0.20.04.1
firefox - update to 128.8.0-1
firefox-debuginfo - update to 128.8.0-1
firefox-debugsource - update to 128.8.0-1

• https://www.mozilla.org/en-US/security/advisories/mfsa2023-20/

• Multiple vulnerabilities in Mozilla Firefox and Firefox ESR
• Ubuntu update for firefox
• Ubuntu update for firefox
• Ubuntu update for firefox
• Gentoo update for Mozilla Firefox
• openEuler 22.03 LTS SP4 update for firefox
• openEuler 22.03 LTS SP3 update for firefox