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hacktricks/network-services-pentesting/pentesting-pop.md
Translator workflow c928d8e52e Translated to Portuguese
2023-06-06 18:56:34 +00:00

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Informação Básica

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).

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.

Portas padrão: 110, 995(ssl)

PORT    STATE SERVICE
110/tcp open  pop3

Enumeração

Banner Grabbing

nc -nv <IP> 110
openssl s_client -connect <IP>:995 -crlf -quiet

Manual

Você pode usar o comando CAPA para obter as capacidades do servidor POP3.

Automatizado

nmap --script "pop3-capabilities or pop3-ntlm-info" -sV -port <PORT> <IP> #All are default scripts

O plugin pop3-ntlm-info retornará alguns dados "sensíveis" (versões do Windows).

Bruteforce POP3

Sintaxe POP

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

De aqui

Exemplo:

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

Configurações Perigosas

De https://academy.hackthebox.com/module/112/section/1073

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.

Comandos Automáticos do HackTricks

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 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
  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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