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CVE-2019-9812

9.3 · CRITICAL

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 malici…

Published Jan 8, 2020EPSS 1.51%

Overview

CVE-2019-9812 is a critical-severity vulnerability. It was published on January 8, 2020 and has a CVSS 3.1 base score of 9.3 (CRITICAL).

This vulnerability has a CVSS 3.1 base score of 9.3, rated CRITICAL. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

Technical 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.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

Refbugzilla.mozilla.org/show_bug.cgi?id=1538008Refbugzilla.mozilla.org/show_bug.cgi?id=1538015Refwww.mozilla.org/security/advisories/mfsa2019-25/Refwww.mozilla.org/security/advisories/mfsa2019-26/Refwww.mozilla.org/security/advisories/mfsa2019-27/Refbugzilla.mozilla.org/show_bug.cgi?id=1538008Refbugzilla.mozilla.org/show_bug.cgi?id=1538015Refwww.mozilla.org/security/advisories/mfsa2019-25/Refwww.mozilla.org/security/advisories/mfsa2019-26/Refwww.mozilla.org/security/advisories/mfsa2019-27/

How CyberStrike helps

Frequently asked questions

What is CVE-2019-9812?

CVE-2019-9812 is a critical-severity vulnerability. It was published on January 8, 2020 and has a CVSS 3.1 base score of 9.3 (CRITICAL).

How severe is CVE-2019-9812?

This vulnerability has a CVSS 3.1 base score of 9.3, rated CRITICAL. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2019-9812?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2019-9812?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2019-9812 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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