CVE-2019-11730 Information disclosure in Firefox
Attackers can read local files via file URIs when users open malicious HTML attachments, potentially exposing sensitive data from other applications.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- Available
What is CVE-2019-11730?
CVE-2019-11730 is a medium-severity vulnerability in Debian Debian Linux, published on 23 Jul 2019. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
Official 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.
Which versions are affected by CVE-2019-11730?
It affects 6 products.
Products include Debian Debian Linux, Mozilla Firefox, Mozilla Firefox Esr, Mozilla Thunderbird, Opensuse Leap, Suse Package Hub.
How do I fix CVE-2019-11730?
Upgrade to a fixed version.
Is CVE-2019-11730 being exploited?
There is no known exploitation of CVE-2019-11730 in the wild and no public exploit code.
Public exploit code: 1 proofs of concept on GitHub.
Other vulnerabilities in Debian Debian Linux
Sources
Also known as DEBIAN-CVE-2019-11730, GHSA-353x-8rf5-m26c, UBUNTU-CVE-2019-11730.