Geert Moernaut LSrunasE 1.0 and Supercrypt 1.0 use the RC4 stream cipher without constructing a unique initialization vector (IV), which makes it easier for local users to obtain cleartext passwords.

Geert Moernaut LSrunasE allows local users to gain privileges by obtaining the encrypted password from a batch file, and constructing a modified batch file that specifies this password in the /password switch and specifies an arbitrary program in the /command switch.

Geert Moernaut LSrunasE and Supercrypt use an encryption key composed of an SHA1 hash of a fixed string embedded in the executable file, which makes it easier for local users to obtain this key without reverse engineering.