#VU20824 Permissions, Privileges, and Access Controls in Mozilla Firefox - CVE-2019-9812
Published: September 3, 2019 / Updated: September 6, 2019
Vulnerability identifier: #VU20824
Vulnerability risk: Medium
CVSSv4.0: CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:A/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Green
CVE-ID: CVE-2019-9812
CWE-ID: CWE-264
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerable software:
Mozilla Firefox
Mozilla Firefox
Software vendor:
Mozilla
Mozilla
Description
The vulnerability allows a remote attacker to escape sandbox restrictions.
The vulnerability exists due to a combination of issues related to a compromised sandboxed content and the Firefox Sync ability to synchronize data with the malicious account. A remote attacker can can compromise a sandboxed content process using a different vulnerability, and then escape that sandbox by loading accounts.firefox.com in that process and forcing a log-in to a malicious Firefox Sync account. Preference settings that disable the sandbox are then synchronized to the local machine and the compromised browser would restart without the sandbox if a crash is triggered.
Remediation
Install updates from vendor's website.