T-SQL : Undocumented feature: special account

The application compares the value of the variable which stores the authentication data with a hardcoded value. This special account may be a part of a backdoor.

The application developer could have used a special account (possibly with elevated privileges) for debugging and he/she left the corresponding code sections in the final version, thus, retaining the access to the application functionality. An attacker can decompile the application, extract the hardcoded strings which specify the special account, and get access to the application.

Constant parameters (logins, passwords, keys) must not be stored in the source code of the application.