hacktricks/network-services-pentesting/pentesting-pop.md

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## Informação Básica
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O **Protocolo de Correio** (**POP**) é um tipo de protocolo padrão de Internet e de rede de computadores que extrai e recupera e-mails de um servidor de correio remoto para acesso pela máquina hospedeira. O **POP** é um protocolo de camada de aplicação no modelo OSI que fornece aos usuários finais a capacidade de buscar e receber e-mails (a partir [daqui](https://www.techopedia.com/definition/5383/post-office-protocol-pop)).
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Os clientes **POP** geralmente se conectam, recuperam todas as mensagens, as armazenam no sistema do cliente e as excluem do servidor. Existem 3 versões do **POP**, mas o **POP3** é o mais usado.
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**Portas padrão:** 110, 995(ssl)
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```
PORT STATE SERVICE
110/tcp open pop3
```
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## Enumeração
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### Banner Grabbing
```bash
nc -nv <IP> 110
openssl s_client -connect <IP>:995 -crlf -quiet
```
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## Manual
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Você pode usar o comando `CAPA` para obter as capacidades do servidor POP3.
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## Automatizado
```bash
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nmap --script "pop3-capabilities or pop3-ntlm-info" -sV -port <PORT> <IP> #All are default scripts
```
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O plugin `pop3-ntlm-info` retornará alguns dados "**sensíveis**" (versões do Windows).
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### [Bruteforce POP3](../generic-methodologies-and-resources/brute-force.md#pop)
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## Sintaxe POP
```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
```
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De [aqui](http://sunnyoasis.com/services/emailviatelnet.html)
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Exemplo:
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```
root@kali:~# telnet $ip 110
+OK beta POP3 server (JAMES POP3 Server 2.3.2) ready
USER billydean
+OK
PASS password
+OK Welcome billydean
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list
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+OK 2 1807
1 786
2 1021
retr 1
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+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
```
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## Configurações Perigosas
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De [https://academy.hackthebox.com/module/112/section/1073](https://academy.hackthebox.com/module/112/section/1073)
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| **Configuração** | **Descrição** |
| ------------------------- | ----------------------------------------------------------------------------------------------- |
| `auth_debug` | Habilita todos os logs de depuração de autenticação. |
| `auth_debug_passwords` | Esta configuração ajusta a verbosidade do log, as senhas enviadas e o esquema são registrados. |
| `auth_verbose` | Registra tentativas de autenticação malsucedidas e suas razões. |
| `auth_verbose_passwords` | Senhas usadas para autenticação são registradas e também podem ser truncadas. |
| `auth_anonymous_username` | Isso especifica o nome de usuário a ser usado ao fazer login com o mecanismo SASL ANÔNIMO. |
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## Comandos Automáticos do HackTricks
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```
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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
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Entry_1:
Name: Notes
Description: Notes for POP
Note: |
Post Office Protocol (POP) is a type of computer networking and Internet standard protocol that extracts and retrieves email from a remote mail server for access by the host machine. POP is an application layer protocol in the OSI model that provides end users the ability to fetch and receive email (from here).
The POP clients generally connect, retrieve all messages, store them on the client system, and delete them from the server. There are 3 versions of POP, but POP3 is the most used one.
https://book.hacktricks.xyz/pentesting/pentesting-whois
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
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Command: nmap --script "pop3-capabilities or pop3-ntlm-info" -sV -p 110 {IP}
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Entry_5:
Name: Hydra Brute Force
Description: Need User
Command: hydra -l {Username} -P {Big_Passwordlist} -f {IP} pop3 -V
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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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```
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<details>
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</details>