Enumeration belongs to the first phase of Ethical Hacking, i.e., “Information Gathering”. This is a process where the attacker establishes an active connection with the victim and try to discover as much attack vectors as possible, which can be used to exploit the systems further.
Enumeration can be used to gain information on −
Network shares
SNMP data, if they are not secured properly
IP tables
Usernames of different systems
Passwords policies lists
Enumerations depend on the services that the systems offer. They can be −
DNS enumeration
NTP enumeration
SNMP enumeration
Linux/Windows enumeration
SMB enumeration
Let us now discuss some of the tools that are widely used for Enumeration.
NTP Suite
NTP Suite is used for NTP enumeration. This is important because in a network environment, you can find other primary servers that help the hosts to update their times and you can do it without authenticating the system.
enum4linux
enum4linux is used to enumerate Linux systems. Take a look at the following screenshot and observe how we have found the usernames present in a target host.
enum4linux
smtp-user-enum
smtp-user-enum tries to guess usernames by using SMTP service. Take a look at the following screenshot to understand how it does so.
SMTP
Quick Fix
It is recommended to disable all services that you don’t use. It reduces the possibilities of OS enumeration of the services that your systems are running.
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