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CVE-2019-11730

6.5 · MEDIUM

A vulnerability exists where if a user opens a locally saved HTML file, this file can use file: URIs to access other files in the same directory or sub-directories if the names are known or guessed.

Published Jul 23, 2019EPSS 20.27%

Overview

CVE-2019-11730 is a medium-severity vulnerability. It was published on July 23, 2019 and has a CVSS 3.1 base score of 6.5 (MEDIUM).

This vulnerability has a CVSS 3.1 base score of 6.5, rated MEDIUM. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

Technical description

A vulnerability exists where if a user opens a locally saved HTML file, this file can use file: URIs to access other files in the same directory or sub-directories if the names are known or guessed. The Fetch API can then be used to read the contents of any files stored in these directories and they may uploaded to a server. It was demonstrated that in combination with a popular Android messaging app, if a malicious HTML attachment is sent to a user and they opened that attachment in Firefox, due to that app's predictable pattern for locally-saved file names, it is possible to read attachments the victim received from other correspondents. This vulnerability affects Firefox ESR < 60.8, Firefox < 68, and Thunderbird < 60.8.

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/2019-07/msg00055.htmlReflists.opensuse.org/opensuse-security-announce/2019-07/msg00058.htmlReflists.opensuse.org/opensuse-security-announce/2019-08/msg00073.htmlReflists.opensuse.org/opensuse-security-announce/2019-10/msg00009.htmlReflists.opensuse.org/opensuse-security-announce/2019-10/msg00010.htmlRefbugzilla.mozilla.org/show_bug.cgi?id=1558299Reflists.debian.org/debian-lts-announce/2019/08/msg00001.htmlReflists.debian.org/debian-lts-announce/2019/08/msg00002.htmlRefsecurity.gentoo.org/glsa/201908-12Refsecurity.gentoo.org/glsa/201908-20

How CyberStrike helps

Frequently asked questions

What is CVE-2019-11730?

CVE-2019-11730 is a medium-severity vulnerability. It was published on July 23, 2019 and has a CVSS 3.1 base score of 6.5 (MEDIUM).

How severe is CVE-2019-11730?

This vulnerability has a CVSS 3.1 base score of 6.5, rated MEDIUM. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2019-11730?

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-2019-11730?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2019-11730 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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