Security restrictions bypass in Mozilla Firefox - CVE-2018-12395

Vulnerability identifier: #VU15494

CSH Severity: Low

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

CVE-ID: CVE-2018-12395

CWE-ID: CWE-20

Exploitation vector: Remote access

Exploit availability: No public exploit available

The vulnerability allows a remote attacker to bypass security restrictions on the target system.

The weakness exists due to an error in WebExtension. A remote attacker can trick the victim into visiting a specially crafted website, rewrite the Host request headers using the webRequest API and bypass domain restrictions through domain fronting. This would allow access to domains that share a host that are otherwise restricted.

Mozilla Firefox
Firefox ESR
Arch Linux
Debian Linux
Gentoo Linux
Red Hat Enterprise Linux Server
Red Hat Enterprise Linux Workstation
Red Hat Enterprise Linux Desktop
Red Hat Enterprise Linux for IBM z Systems
Red Hat Enterprise Linux for Scientific Computing
Red Hat Enterprise Linux for Power
Opensuse

Update to version 63.0.

Mozilla Firefox - update to 63.0
Firefox ESR - update to 60.3.0

• https://www.mozilla.org/en-US/security/advisories/mfsa2018-26/

• Multiple vulnerabilities in Mozilla Firefox
• Multiple vulnerabilities in Mozilla Firefox ESR
• Arch Linux update for firefox
• Debian update for firefox-esr
• OpenSUSE Linux update for Mozilla Firefox
• Gentoo update for Mozilla Firefox
• Red Hat update for firefox
• Red Hat update for firefox