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CVE-2019-11753

7.8 · HIGH

The Firefox installer allows Firefox to be installed to a custom user writable location, leaving it unprotected from manipulation by unprivileged users or malware.

Published Sep 27, 2019CWE-354EPSS 0.23%

Overview

CVE-2019-11753 is a high-severity vulnerability. It was published on September 27, 2019 and has a CVSS 3.1 base score of 7.8 (HIGH).

This vulnerability has a CVSS 3.1 base score of 7.8, rated HIGH. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

Technical description

The Firefox installer allows Firefox to be installed to a custom user writable location, leaving it unprotected from manipulation by unprivileged users or malware. If the Mozilla Maintenance Service is manipulated to update this unprotected location and the updated maintenance service in the unprotected location has been altered, the altered maintenance service can run with elevated privileges during the update process due to a lack of integrity checks. This allows for privilege escalation if the executable has been replaced locally. <br>*Note: This attack requires local system access and only affects Windows. Other operating systems are not affected.*. This vulnerability affects Firefox < 69, Firefox ESR < 60.9, and Firefox ESR < 68.1.

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

Reflists.opensuse.org/opensuse-security-announce/2019-10/msg00011.htmlReflists.opensuse.org/opensuse-security-announce/2019-10/msg00017.htmlRefbugzilla.mozilla.org/show_bug.cgi?id=1574980Refwww.mozilla.org/security/advisories/mfsa2019-25/Refwww.mozilla.org/security/advisories/mfsa2019-26/Refwww.mozilla.org/security/advisories/mfsa2019-27/Reflists.opensuse.org/opensuse-security-announce/2019-10/msg00011.htmlReflists.opensuse.org/opensuse-security-announce/2019-10/msg00017.htmlRefbugzilla.mozilla.org/show_bug.cgi?id=1574980Refwww.mozilla.org/security/advisories/mfsa2019-25/

How CyberStrike helps

Frequently asked questions

What is CVE-2019-11753?

CVE-2019-11753 is a high-severity vulnerability. It was published on September 27, 2019 and has a CVSS 3.1 base score of 7.8 (HIGH).

How severe is CVE-2019-11753?

This vulnerability has a CVSS 3.1 base score of 7.8, rated HIGH. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

How do I fix or remediate CVE-2019-11753?

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-2019-11753?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2019-11753 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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