Vulnerability in Mozilla Firefox
CVE-2019-9812
Given a compromised sandboxed content process due to a separate vulnerability, it is possible to 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. This vulnerability affects Firefox ESR < 60.9, Firefox ESR < 68.1, and Firefox < 69.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 9.3 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:N/I:H/A:H.
EPSS exploit prediction
EPSS: 0.015 (74.3th percentile), scored .
Low probability of exploitation in the next 30 days, but still tracked. 74th percentile — 74.3% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.015 · newest: 0.015 · change: 0.000
Affected products
- Mozilla Firefox — versions before 69
- Mozilla Firefox Esr — versions before 60.9, before 68.1
References
- www.mozilla.org/security/advisories/mfsa2019-25/ (Vendor Advisory)
- www.mozilla.org/security/advisories/mfsa2019-27/ (Vendor Advisory)
- www.mozilla.org/security/advisories/mfsa2019-26/ (Vendor Advisory)
- bugzilla.mozilla.org/show_bug.cgi (Permissions Required)
- bugzilla.mozilla.org/show_bug.cgi (Permissions Required)
Frequently asked questions
- What is CVE-2019-9812?
- CVE-2019-9812 is a critical-severity vulnerability in Mozilla Firefox. CVSS score: 9.3/10. Published 2020-01-08.
- How severe is CVE-2019-9812?
- Critical severity. CVSS v3 base score is 9.3 out of 10.