Microsoft Edge (Chromium-based) Elevation of Privilege Vulnerability

An elevation of privilege vulnerability exists in Microsoft Edge (Chromium-based) when DLL files are allowed to download without prompting additional warning to the user. An attacker who successfully exploited this vulnerability could drop the DLL files on the users Download folder (or equivalent) and gain elevated privileges.

To exploit the vulnerability, the user must browse to a malicious website that is design to download a DLL file and click on the page to being the process. In an email attack scenario, an attacker could send an email message in an attempt to convince the user to go to the malicious site.

The vulnerability by itself does not allow arbitrary code to run. However, this vulnerability could be used in conjunction with one or more vulnerabilities (for example a remote code execution vulnerability and another elevation of privilege vulnerability) to take advantage of the elevated privileges when running.

The security update addresses the vulnerability by introducing additional security measures on Microsoft Edge (Chromium-based) and prompting a user warning before completing a DLL file download.