Processor optimization removal or modification of security-critical code in Firefox for Android and Mozilla Firefox - CVE-2024-3855

Vulnerability identifier: #VU88655

CSH Severity: Medium

CVSS v4: 7.5 [CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:A/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N]

CVE-ID: CVE-2024-3855

CWE-ID: CWE-1037

Exploitation vector: Remote access

Exploit availability: No public exploit available

The vulnerability allows a remote attacker to compromise the affected system.

The vulnerability exists due to JIT incorrectly optimized MSubstr operations. A remote attacker can trick the victim to visit a specially crafted website, trigger an out-of-bounds read and potentially compromise the affected system.

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

Install updates from vendor's website.

Mozilla Firefox - update to 125.0
www-client/firefox - update to 104
firefox - addressed in versions 125.0-1.fc38, 125.0-1.fc39, 125.0-1.fc40
firefox (Ubuntu package) - addressed in versions 125.0.2+build1-0ubuntu0.20.04.2, 125.0.3+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/mfsa2024-18/

• Multiple vulnerabilities in Mozilla Firefox and Firefox ESR
• Fedora 40 update for firefox
• Fedora 38 update for firefox
• Fedora 39 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