CVE-2019-9812

CRITICAL

Firefox < 60.9 - Sandbox Escape via Malicious Firefox Sync Account

Title source: llm

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.

References (5)

Core 5

Core References

Vendor Advisory x_refsource_confirm

https://www.mozilla.org/security/advisories/mfsa2019-25/

Vendor Advisory x_refsource_confirm

https://www.mozilla.org/security/advisories/mfsa2019-27/

Vendor Advisory x_refsource_confirm

https://www.mozilla.org/security/advisories/mfsa2019-26/

Permissions Required x_refsource_misc

https://bugzilla.mozilla.org/show_bug.cgi?id=1538015

Permissions Required x_refsource_confirm

https://bugzilla.mozilla.org/show_bug.cgi?id=1538008

Scores

CVSS v3 9.3

EPSS 0.0040

EPSS Percentile 60.5%

Attack Vector NETWORK

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

Details

Status published

Products (1)

mozilla/firefox < 60.9

Published Jan 08, 2020

Tracked Since Feb 18, 2026