The PCs in our school have a software called "Dr. Kaiser" which purpose is to prevent changes to the disk. I thought it's working like DeepFreeze for OSX devices; having a copy-on-write feature or something like that. One day a friend of mine (kinda newbie in hacking) said he wanted to create a backdoor in the system so you can login as the local administrator of the device. He replaced the "sethc.exe" in the windows directory with cmd.exe on a live distro and claimed it was working perfectly. It turned out that "Dr. Kaiser" is indeed loading the default image on startup, but doesn't verify checksums for system files (and also doesn't include the files in the default image). Long story short: You now can open a cmd with System permissions on every PC in the building.

This. Is. Stupid. It should be forbidden to sell this software 😖