Resource management error in Mozilla Firefox - CVE-2019-9809

Vulnerability identifier: #VU18046

CSH Severity: Low

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

CVE-ID: CVE-2019-9809

CWE-ID: CWE-399

Exploitation vector: Remote access

Exploit availability: No public exploit available

The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.

The vulnerability exists due to incorrect processing of modal alert messages sent by FTP server. A remote attacker can trick the victim to connect to a malicious FTP server and trigger a series of modal alert messages for these resources through invalid credentials or locations, resulting in denial of service attack

Mozilla Firefox
Arch Linux
firefox (Ubuntu package)

Install updates from vendor's website.

Mozilla Firefox - update to 66.0
firefox (Ubuntu package) - addressed in versions 66.0.1+build1-0ubuntu0.14.04.1, 66.0.2+build1-0ubuntu0.14.04.1, 66.0.2+build1-0ubuntu0.16.04.1, 66.0.2+build1-0ubuntu0.18.04.1, 66.0.2+build1-0ubuntu0.18.10.1, 66.0.3+build1-0ubuntu0.14.04.1, 66.0.3+build1-0ubuntu0.16.04.1, 66.0.3+build1-0ubuntu0.18.04.1, 66.0.3+build1-0ubuntu0.18.10.1

• https://www.mozilla.org/en-US/security/advisories/mfsa2019-07/
• https://bugzilla.mozilla.org/show_bug.cgi?id=1282430
• https://bugzilla.mozilla.org/show_bug.cgi?id=1523249

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