# 110,995 - Pentesting POP
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***
## 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](../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 [https://academy.hackthebox.com/module/112/section/1073](https://academy.hackthebox.com/module/112/section/1073)
| **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'
```
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Learn AWS hacking from zero to hero withhtARTE (HackTricks AWS Red Team Expert)!
* Do you work in a **cybersecurity company**? Do you want to see your **company advertised in HackTricks**? or do you want to have access to the **latest version of the PEASS or download HackTricks in PDF**? Check the [**SUBSCRIPTION PLANS**](https://github.com/sponsors/carlospolop)!
* Discover [**The PEASS Family**](https://opensea.io/collection/the-peass-family), our collection of exclusive [**NFTs**](https://opensea.io/collection/the-peass-family)
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* **Share your hacking tricks by submitting PRs to the [hacktricks repo](https://github.com/carlospolop/hacktricks) and [hacktricks-cloud repo](https://github.com/carlospolop/hacktricks-cloud)**.