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

Vulnerability identifier: #VU15494

CSH Severity: Low

CVSS v4.0: 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/E:U/U:Clear

CVE-ID: CVE-2018-12395

CWE-ID: CWE-20

Exploitation vector: Remote access

Exploit availability: No public exploit available

Vendor: Mozilla

Affected software:
Mozilla Firefox

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.

Update to version 63.0.

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