> For the complete documentation index, see [llms.txt](https://angelica.gitbook.io/hacktricks/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://angelica.gitbook.io/hacktricks/network-services-pentesting/pentesting-pop.md). # 110,995 - Pentesting POP {% hint style="success" %} Learn & practice AWS Hacking:[**HackTricks Training AWS Red Team Expert (ARTE)**](https://training.hacktricks.xyz/courses/arte)\ Learn & practice GCP Hacking: [**HackTricks Training GCP Red Team Expert (GRTE)**](https://training.hacktricks.xyz/courses/grte)
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{% endhint %} ## Basic Information **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. **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](/hacktricks/generic-methodologies-and-resources/brute-force.md#pop) ## POP syntax POP commands examples from [here](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 ``` 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 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' ``` {% hint style="success" %} Learn & practice AWS Hacking:[**HackTricks Training AWS Red Team Expert (ARTE)**](https://training.hacktricks.xyz/courses/arte)\ Learn & practice GCP Hacking: [**HackTricks Training GCP Red Team Expert (GRTE)**](https://training.hacktricks.xyz/courses/grte)
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