113 - Pentesting Ident

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Basic Information

The Ident Protocol is used over the Internet to associate a TCP connection with a specific user. Originally designed to aid in network management and security, it operates by allowing a server to query a client on port 113 to request information about the user of a particular TCP connection.

However, due to modern privacy concerns and the potential for misuse, its usage has decreased as it can inadvertently reveal user information to unauthorized parties. Enhanced security measures, such as encrypted connections and strict access controls, are recommended to mitigate these risks.

Default port: 113

PORT STATE SERVICE 113/tcp open ident

Enumeration

Manual - Get user/Identify the service

If a machine is running the service ident and samba (445) and you are connected to samba using the port 43218. You can get which user is running the samba service by doing:

If you just press enter when you conenct to the service:

Other errors:

Nmap

By default (`-sC``) nmap will identify every user of every running port:

PORT STATE SERVICE VERSION 22/tcp open ssh OpenSSH 4.3p2 Debian 9 (protocol 2.0) |_auth-owners: root | ssh-hostkey: | 1024 88:23:98:0d:9d:8a:20:59:35:b8:14:12:14:d5:d0:44 (DSA) |_ 2048 6b:5d:04:71:76:78:56:96:56:92:a8:02:30:73:ee:fa (RSA) 113/tcp open ident |_auth-owners: identd 139/tcp open netbios-ssn Samba smbd 3.X - 4.X (workgroup: LOCAL) |_auth-owners: root 445/tcp open netbios-ssn Samba smbd 3.0.24 (workgroup: LOCAL) |_auth-owners: root

Ident-user-enum

Ident-user-enum is a simple PERL script to query the ident service (113/TCP) in order to determine the owner of the process listening on each TCP port of a target system. The list of usernames gathered can be used for password guessing attacks on other network services. It can be installed with apt install ident-user-enum.

root@kali:/opt/local/recon/192.168.1.100# ident-user-enum 192.168.1.100 22 113 139 445 ident-user-enum v1.0 ( http://pentestmonkey.net/tools/ident-user-enum ) 192.168.1.100:22 root 192.168.1.100:113 identd 192.168.1.100:139 root 192.168.1.100:445 root

Shodan

  • oident

Files

identd.conf

HackTricks Automatic Commands

Protocol_Name: Ident #Protocol Abbreviation if there is one. Port_Number: 113 #Comma separated if there is more than one. Protocol_Description: Identification Protocol #Protocol Abbreviation Spelled out Entry_1: Name: Notes Description: Notes for Ident Note: | The Ident Protocol is used over the Internet to associate a TCP connection with a specific user. Originally designed to aid in network management and security, it operates by allowing a server to query a client on port 113 to request information about the user of a particular TCP connection. https://book.hacktricks.wiki/en/network-services-pentesting/113-pentesting-ident.html Entry_2: Name: Enum Users Description: Enumerate Users Note: apt install ident-user-enum ident-user-enum {IP} 22 23 139 445 (try all open ports)

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