This is a whitepaper detailing how to perform authentication bypass against Sage 50 Payroll 2012 version 18.00.031 using Immunity Debugger.
You can download it from the following link: https://packetstormsecurity.com/files/download/115946/payroll-bypass.pdf
Source: https://packetstormsecurity.com/files/115946/Sage-50-Payroll-2012-Authentication-Bypass.html