CVE-2019-9812 Information

Description

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.

CVSS Vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:N/I:H/A:H

Reference

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

Attack Complexity

LOW

Privileges Required

NONE

User Interaction Required

NONE

Scope

REQUIRED

Confidentiality Impact

CHANGED

Integrity Impact

NONE

Availability Impact

HIGH

Base Score

HIGH

Base Severity

9.3