# 110,995 - Pentesting POP
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## Basic Information **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)). 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. **Default ports:** 110, 995(ssl) ``` PORT STATE SERVICE 110/tcp open pop3 ``` ## Enumeration ### Banner Grabbing ```bash nc -nv 110 openssl s_client -connect :995 -crlf -quiet ``` ## Manual You can use the command `CAPA` to obtain the capabilities of the POP3 server. ## Automated ```bash nmap --script "pop3-capabilities or pop3-ntlm-info" -sV -port #All are default scripts ``` The `pop3-ntlm-info` plugin will return some "**sensitive**" data (Windows versions). ### [POP3 bruteforce](/dashboard/generic-methodologies-and-resources/brute-force.md#pop) ## POP syntax ```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 ``` From [here](http://sunnyoasis.com/services/emailviatelnet.html) Example: ``` 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 ``` ## Dangerous Settings From | **Setting** | **Description** | | ------------------------- | ----------------------------------------------------------------------------------------- | | `auth_debug` | Enables all authentication debug logging. | | `auth_debug_passwords` | This setting adjusts log verbosity, the submitted passwords, and the scheme gets logged. | | `auth_verbose` | Logs unsuccessful authentication attempts and their reasons. | | `auth_verbose_passwords` | Passwords used for authentication are logged and can also be truncated. | | `auth_anonymous_username` | This specifies the username to be used when logging in with the ANONYMOUS SASL mechanism. | ## HackTricks Automatic Commands ``` 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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