Security restrictions bypass in Mozilla Firefox - CVE-2018-18497

Vulnerability identifier: #VU16492

CSH Severity: Low

CVSS v4: 6.9 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N]

CVE-ID: CVE-2018-18497

CWE-ID: CWE-264

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 limitations on the URIs. A remote attacker can bypass WebExtensions by the browser.windows.create API when a pipe in the URL field is used within the extension to load multiple pages as a single argument and open privileged about: or file: locations.

Mozilla Firefox
Arch Linux
Ubuntu
firefox (Ubuntu package)

Update to version 64.0.

Mozilla Firefox - update to 64.0
firefox (Ubuntu package) - addressed in versions 64.0+build3-0ubuntu0.14.04.1, 64.0+build3-0ubuntu0.16.04.1, 64.0+build3-0ubuntu0.18.04.1, 64.0+build3-0ubuntu0.18.10.1

• https://www.mozilla.org/en-US/security/advisories/mfsa2018-29/

• Multiple vulnerabilities in Mozilla Firefox
• Arch Linux update for firefox
• Ubuntu update for firefox