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.

• https://bugzilla.mozilla.org/show_bug.cgi?id=1538008Permissions Required
• https://bugzilla.mozilla.org/show_bug.cgi?id=1538015Permissions Required
• https://www.mozilla.org/security/advisories/mfsa2019-25/Vendor Advisory
• https://www.mozilla.org/security/advisories/mfsa2019-26/Vendor Advisory
• https://www.mozilla.org/security/advisories/mfsa2019-27/Vendor Advisory
• https://bugzilla.mozilla.org/show_bug.cgi?id=1538008Permissions Required
• https://bugzilla.mozilla.org/show_bug.cgi?id=1538015Permissions Required
• https://www.mozilla.org/security/advisories/mfsa2019-25/Vendor Advisory
• https://www.mozilla.org/security/advisories/mfsa2019-26/Vendor Advisory
• https://www.mozilla.org/security/advisories/mfsa2019-27/Vendor Advisory

Published

Jan 8, 2020

Last Modified

Jun 17, 2026

Status

Modified

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