DΛΣMӨП

// HackTricks · Network Services

113 - Pentesting Ident

113 - Pentesting Ident

Basic Information

The Identification Protocol (Ident) lets one host ask the other end of an existing TCP connection which local operating-system identity owns that connection. A query contains the server-side and client-side port pair, and the Ident server normally listens on TCP/113.[2]

RFC 1413 explicitly warns that an Ident response is not authentication or authorization: it is unauthenticated information asserted by the queried host and may be forged or intentionally misleading. It can still disclose usernames and service-account relationships during enumeration.[2]

Default port: 113

PORT    STATE SERVICE
113/tcp open  ident

Enumeration

Manual - Get user/Identify the service

If a machine runs Ident and you have a TCP connection from local source port 43218 to its Samba port 445, query the pair 445, 43218. A response may identify the remote account owning that connection; do not treat it as trusted proof of identity.[2]

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...

If you just press Enter when you connect to the service:

Enumeration - Manual - Get user/Identify the service: If you just press Enter when you connect to the service

Other errors:

Enumeration - Manual - Get user/Identify the service: If you just press Enter when you connect to the service

Nmap

Nmap’s auth-owners script queries Ident for the owner of each suitable open TCP connection. Results depend on the target’s Ident policy and are not available for every service or network path.[3]

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.[1]

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)

References