Exposed dangerous method or function in Mozilla Firefox - CVE-2019-11701

Vulnerability identifier: #VU18566

CSH Severity: Low

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

CVE-ID: CVE-2019-11701

CWE-ID: CWE-749

Exploitation vector: Remote access

Exploit availability: No public exploit available

The vulnerability allows a remote attacker to perform cross-site scripting attacks.

The vulnerability exists due to presence of a legacy support for webcal: protocol handler that allows to load a web site vulnerable to cross-site scripting attacks.

Mozilla Firefox
Arch Linux
firefox (Ubuntu package)

Install updates from vendor's website.

Mozilla Firefox - update to 67.0
firefox (Ubuntu package) - addressed in versions 67.0+build2-0ubuntu0.16.04.1, 67.0+build2-0ubuntu0.18.04.1, 67.0+build2-0ubuntu0.18.10.1, 67.0+build2-0ubuntu0.19.04.1, 67.0.1+build1-0ubuntu0.16.04.1, 67.0.1+build1-0ubuntu0.18.04.1, 67.0.1+build1-0ubuntu0.18.10.1, 67.0.1+build1-0ubuntu0.19.04.1, 67.0.2+build2-0ubuntu0.16.04.1, 67.0.2+build2-0ubuntu0.18.04.1, 67.0.2+build2-0ubuntu0.18.10.1, 67.0.2+build2-0ubuntu0.19.04.1

• https://www.mozilla.org/en-US/security/advisories/mfsa2019-13/

• Multiple vulnerabilities in Mozilla Firefox
• Ubuntu update for Firefox
• Arch Linux update for firefox
• USN-3991-2: Firefox regression
• Ubuntu regression update for Firefox (regression update)