Synopsis
Tenable has discovered a privilege escalation vulnerability in the Bitmask Riseup VPN 0.21.6 (the latest version on bitmask.net/en/install, marked as 0.21.2 there) as installed on Windows 10. When the software is installed with a non-default installation directory off of the system root, the installer fails to properly set ACLs. This allows lower privileged users to replace the VPN executable with a malicious one. When a higher privileged user such as an Administrator launches that executable, it is possible for the lower privileged user to escalate to Administrator privileges.
Solution
Use installation media for version 0.21.11 or later.Disclosure Timeline
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