1. Identify system weaknesses

The hacker now works at the application layer to find weaknesses in every network service he accesses. Indeed, in most cases, a hacker succeeds in penetrating a system only because of weaknesses that could easily be avoided or corrected, provided the system administrator and the manufacturer of the software he uses pay attention.

The weaknesses are classified into four main groups. Some of these groups – authentication weaknesses 1.2 and configuration weaknesses 1.3...