# 110,995 - Pentesting POP

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## Informazioni di base

**Post Office Protocol (POP)** è descritto come un protocollo nell'ambito del networking informatico e di Internet, utilizzato per l'estrazione e il **recupero di email da un server di posta remoto**, rendendole accessibili sul dispositivo locale. Posizionato all'interno del livello applicativo del modello OSI, questo protocollo consente agli utenti di recuperare e ricevere email. Il funzionamento dei **client POP** comporta tipicamente l'instaurazione di una connessione con il server di posta, il download di tutti i messaggi, la memorizzazione di questi messaggi localmente sul sistema client e successivamente la loro rimozione dal server. Sebbene ci siano tre iterazioni di questo protocollo, **POP3** si distingue come la versione più comunemente utilizzata.

**Porte predefinite:** 110, 995(ssl)
```
PORT    STATE SERVICE
110/tcp open  pop3
```
## Enumerazione

### Acquisizione del Banner
```bash
nc -nv <IP> 110
openssl s_client -connect <IP>:995 -crlf -quiet
```
## Manuale

Puoi utilizzare il comando `CAPA` per ottenere le capacità del server POP3.

## Automatizzato
```bash
nmap --script "pop3-capabilities or pop3-ntlm-info" -sV -port <PORT> <IP> #All are default scripts
```
Il plugin `pop3-ntlm-info` restituirà alcuni dati "**sensibili**" (versioni di Windows).

### [Bruteforce POP3](../generic-methodologies-and-resources/brute-force.md#pop)

## Sintassi POP

Esempi di comandi POP da [qui](http://sunnyoasis.com/services/emailviatelnet.html)
```bash
POP commands:
USER uid           Log in as "uid"
PASS password      Substitue "password" for your actual password
STAT               List number of messages, total mailbox size
LIST               List messages and sizes
RETR n             Show message n
DELE n             Mark message n for deletion
RSET               Undo any changes
QUIT               Logout (expunges messages if no RSET)
TOP msg n          Show first n lines of message number msg
CAPA               Get capabilities
```
Esempio:
```
root@kali:~# telnet $ip 110
+OK beta POP3 server (JAMES POP3 Server 2.3.2) ready
USER billydean
+OK
PASS password
+OK Welcome billydean

list

+OK 2 1807
1 786
2 1021

retr 1

+OK Message follows
From: jamesbrown@motown.com
Dear Billy Dean,

Here is your login for remote desktop ... try not to forget it this time!
username: billydean
password: PA$$W0RD!Z
```
## Impostazioni Pericolose

Da [https://academy.hackthebox.com/module/112/section/1073](https://academy.hackthebox.com/module/112/section/1073)

| **Impostazione**               | **Descrizione**                                                                           |
| ------------------------------ | ----------------------------------------------------------------------------------------- |
| `auth_debug`                   | Abilita tutti i log di debug dell'autenticazione.                                        |
| `auth_debug_passwords`         | Questa impostazione regola la verbosità dei log, le password inviate e lo schema viene registrato.  |
| `auth_verbose`                 | Registra i tentativi di autenticazione non riusciti e i loro motivi.                     |
| `auth_verbose_passwords`       | Le password utilizzate per l'autenticazione vengono registrate e possono anche essere troncate.                   |
| `auth_anonymous_username`      | Questo specifica il nome utente da utilizzare quando si accede con il meccanismo ANONYMOUS SASL. |


## HackTricks Comandi Automatici
```
Protocol_Name:  POP   #Protocol Abbreviation if there is one.
Port_Number:  110     #Comma separated if there is more than one.
Protocol_Description: Post Office Protocol         #Protocol Abbreviation Spelled out

Entry_1:
Name: Notes
Description: Notes for POP
Note: |
Post Office Protocol (POP) is described as a protocol within the realm of computer networking and the Internet, which is utilized for the extraction and retrieval of email from a remote mail server**, making it accessible on the local device. Positioned within the application layer of the OSI model, this protocol enables users to fetch and receive email. The operation of POP clients typically involves establishing a connection to the mail server, downloading all messages, storing these messages locally on the client system, and subsequently removing them from the server. Although there are three iterations of this protocol, POP3 stands out as the most prevalently employed version.

https://book.hacktricks.xyz/network-services-pentesting/pentesting-pop

Entry_2:
Name: Banner Grab
Description: Banner Grab 110
Command: nc -nv {IP} 110

Entry_3:
Name: Banner Grab 995
Description: Grab Banner Secure
Command: openssl s_client -connect {IP}:995 -crlf -quiet

Entry_4:
Name: Nmap
Description: Scan for POP info
Command: nmap --script "pop3-capabilities or pop3-ntlm-info" -sV -p 110 {IP}

Entry_5:
Name: Hydra Brute Force
Description: Need User
Command: hydra -l {Username} -P {Big_Passwordlist} -f {IP} pop3 -V

Entry_6:
Name: consolesless mfs enumeration
Description: POP3 enumeration without the need to run msfconsole
Note: sourced from https://github.com/carlospolop/legion
Command: msfconsole -q -x 'use auxiliary/scanner/pop3/pop3_version; set RHOSTS {IP}; set RPORT 110; run; exit'

```
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