Permissions, Privileges, and Access Controls in Mozilla Firefox - CVE-2019-9802

Detailed vulnerability description

The vulnerability allows a remote attacker to gain access to sensitive information.

The vulnerability exists due to improper handling of FTP downloads. A remote attacker can trick the victim to open a specially crafted web page and initiate an FTP download which will then use a child process to render the downloaded data. The downloaded data can then be passed to the Chrome process with an arbitrary file length supplied by an attacker, bypassing sandbox protections and allow for a potential memory read of adjacent data from the privileged Chrome process.

How to mitigate CVE-2019-9802

Sources

• https://www.mozilla.org/en-US/security/advisories/mfsa2019-07/
• https://bugzilla.mozilla.org/show_bug.cgi?id=1415508