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https://github.com/carlospolop/hacktricks
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120 lines
3.5 KiB
Markdown
120 lines
3.5 KiB
Markdown
# 110,995 - Pentesting POP
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## Basic Information
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**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 \(from [here](https://www.techopedia.com/definition/5383/post-office-protocol-pop)\).
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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.
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**Default ports:** 110, 995\(ssl\)
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```text
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PORT STATE SERVICE
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110/tcp open pop3
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```
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## Enumeration
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### Banner Grabbing
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```bash
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nc -nv <IP> 110
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openssl s_client -connect <IP>:995 -crlf -quiet
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```
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## Manual
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You can use the command `CAPA` to obtain the capabilities of the POP3 server.
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## Automated
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```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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```
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The `pop3-ntlm-info` plugin will return some "**sensitive**" data \(Windows versions\).
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### [POP3 bruteforce](../brute-force.md#pop)
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## POP syntax
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```bash
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POP commands:
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USER uid Log in as "uid"
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PASS password Substitue "password" for your actual password
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STAT List number of messages, total mailbox size
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LIST List messages and sizes
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RETR n Show message n
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DELE n Mark message n for deletion
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RSET Undo any changes
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QUIT Logout (expunges messages if no RSET)
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TOP msg n Show first n lines of message number msg
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CAPA Get capabilities
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```
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From [here](http://sunnyoasis.com/services/emailviatelnet.html)
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Example:
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```text
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root@kali:~# telnet $ip 110
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+OK beta POP3 server (JAMES POP3 Server 2.3.2) ready
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USER billydean
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+OK
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PASS password
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+OK Welcome billydean
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list
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+OK 2 1807
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1 786
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2 1021
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retr 1
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+OK Message follows
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From: jamesbrown@motown.com
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Dear Billy Dean,
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Here is your login for remote desktop ... try not to forget it this time!
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username: billydean
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password: PA$$W0RD!Z
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```
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## HackTricks Automatic Commands
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```text
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Protocol_Name: POP #Protocol Abbreviation if there is one.
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Port_Number: 110 #Comma separated if there is more than one.
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Protocol_Description: Post Office Protocol #Protocol Abbreviation Spelled out
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Entry_1:
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Name: Notes
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Description: Notes for POP
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Note: |
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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).
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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.
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https://book.hacktricks.xyz/pentesting/pentesting-whois
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Entry_2:
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Name: Banner Grab
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Description: Banner Grab 110
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Command: nc -nv {IP} 110
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Entry_3:
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Name: Banner Grab 995
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Description: Grab Banner Secure
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Command: openssl s_client -connect {IP}:995 -crlf -quiet
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Entry_4:
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Name: Nmap
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Description: Scan for POP info
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Command: nmap --scripts "pop3-capabilities or pop3-ntlm-info" -sV -port 110 {IP}
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Entry_5:
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Name: Hydra Brute Force
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Description: Need User
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Command: hydra -l {Username} -P {Big_Passwordlist} -f {IP} pop3 -V
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```
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