CVE-2020-12510 – Beckhoff: Privilege Escalation through TwinCat System

https://notcve.org/view.php?id=CVE-2020-12510

The default installation path of the TwinCAT XAR 3.1 software in all versions is underneath C:\TwinCAT. If the directory does not exist it and further subdirectories are created with permissions which allow every local user to modify the content. The default installation registers TcSysUI.exe for automatic execution upon log in of a user. If a less privileged user has a local account he or she can replace TcSysUI.exe. It will be executed automatically by another user during login. • https://cert.vde.com/en-us/advisories/vde-2020-037 • CWE-276: Incorrect Default Permissions •