This repository contains the files necessary for the DEFCON CTF VM that I created. You can grab a copy of the VM itself from my blog.
To use this VM, simply start it up in VMware and do the following to connect to a given service:
nc defcon.local <port> # for TCPv4 services
nc6 defcon.local <port> # for TCPv6 services
NOTE: Your network settings may not resolve "defcon.local" as a hostname. You can log in and run ifconfig from
inside the VM to get its IP address. You can also try using just "defcon" or "defcon." and see if
those work.
Getting the flag for each service is, obviously, an exercise left to the reader.
- Organizers: Kenshoto
- Operating System: FreeBSD 5.4
NOTE: Check /root/kinit.py for how to run these services! Many of these were xinetd services that don't contain
their own server setup code.
| Service Name | User | Port | Protocol | Notes |
|---|---|---|---|---|
| apachectl | ????? | ????? | ?????? | NOT RUNNING |
| befunge | bfg | ????? | ?????? | NOT RUNNING: Requires the PyFunge library |
| bparkd | bparkd | ????? | ?????? | NOT RUNNING: Requires enigma and .bpconfig to run |
| echod | ????? | ????? | ?????? | NOT RUNNING |
| fingerd | ????? | ????? | ?????? | NOT RUNNING |
| fucktcpd | ????? | ????? | ?????? | NOT RUNNING |
| HowAreYouToday.py | frat | ????? | ?????? | NOT RUNNING |
| inetd | ????? | ????? | ?????? | NOT RUNNING |
| kmud.py | kmud | ????? | ?????? | NOT RUNNING |
| kpub.py | pub | ????? | ?????? | NOT RUNNING |
| named | ????? | ????? | ?????? | NOT RUNNING |
| postfix | ????? | ????? | ?????? | NOT RUNNING |
| tomcat50ctl | www | ????? | ?????? | NOT RUNNING |
| transformd | transform | ????? | ?????? | NOT RUNNING: Requires joshua to run? |
| UserAdder.py | ????? | ????? | ?????? | NOT RUNNING |
| wumpus | wumpus | ????? | ?????? | NOT RUNNING |
Other binaries I've come across that may have been part of this year:
- alice
- b16
- kstrings
- nettoe
- readmail
- smtpd
- vacation
- Organizers: Kenshoto
- Operating System: Solaris ???
Notably absent from the VM are the services from DEFCON 14. These challenges were built for and ran on Solaris. Since I haven't created a Solaris VM to host them (and a Solaris translation layer for FreeBSD doesn't appear to exist), I can't get them running. I do, however, have what I think are all of the services if anyone would like to play with them. Their names are:
- CookieMonster
- CustomHeap
- FingerLickinGood
- FuckTcpd2
- Heisenberg
- IFallDown
- InMyMemory
- KuFtpd
- NPComplete
- OhShitD
- SpamMe
- Vanilla
- YouHadMeAtHello
- Organizers: Kenshoto
- Operating System: FreeBSD 6.3?
NOTE: Many of the following services require the compat6x-i386 package to be installed.
| Service Name | User | Port | Protocol | Notes |
|---|---|---|---|---|
| arpsd | arps | 1331 | TCPv4 | |
| blowlogd | blowlog | 1500 | UDPv4 | |
| hfd | hfd | 1024 | TCPv4 | Needs server.pem, dh1024.pem, root.pem in /home/hfd |
| kftpd | kftp | 2121 | TCPv4 | |
| kimjong | kimjong | 9999 | TCPv4 | |
| kuftpd | kuftpd | 21 | TCPv4 | |
| madlibd | madlib | 4042 | TCPv4 | Needs articles.txt, nouns.txt, objects.txt, verbs.txt in /home/madlib |
| menageatrois | menageatrois | 3339 | TCPv4 | |
| neurod | wintermute | 5953 | TCPv4 | Requires the dlmalloc package to be installed |
| perudo | perudo | 3822 | TCPv4 | |
| rolodex | rolodex | 8224 | TCPv4 | |
| sammichd | sammich | 8365 | TCPv4 | |
| shellcat | shellcat | 7890 | TCPv4 | |
| sor | sor | 9051 | TCPv4 | |
| supd | sup | ????? | ????? | NOT RUNNING: Requires python2.5 and the socket module (also may actually have been from DEFCON 16..? need to confirm with someone) |
Other binaries I've come across that may have been part of this year:
- xserver (looks like a web challenge...drops to user "xserver")
- UserAdder and makeuser? (looks like just a way to create users...drops to user "makeuser")
- I have a "serverd" somehow that I have listed as being from this year, but honestly no idea where this is from or what it's for
- Organizers: Kenshoto
- Operating System: FreeBSD 6.3
| Service Name | User | Port | Protocol | Notes |
|---|---|---|---|---|
| antipastod | antipasto | 7482 | TCPv4 | |
| aspd | asp | ????? | ????? | NOT RUNNING: Won't run for some reason...just prints "Done" |
| bakalakadakaChat | durka | 15641 | TCPv4 | |
| barista | barista | ????? | ????? | NOT RUNNING: 1: Syntax error: ")" unexpected |
| catdoord | catdoor | 4341 | TCPv4 | |
| duckshootd | duckshoot | 3888 | TCPv4 | |
| EmergencyBrake | EmergencyBrake | 2028 | TCPv4 | |
| grimcreeper.d | grimcreeper | 9001 | TCPv4 | |
| hashpiped | hashpipe | 5641 | TCPv4 | |
| iMagick | iMagick | 4141 | TCPv4 | |
| kdnsd | kdns | ????? | ????? | NOT RUNNING: Requires kdns.conf, python2.5, and the socket module to run |
| kmaild | kmail | 17722 | TCPv4 | |
| kmsgd | kmsg | 10001 | TCPv4 | |
| kryptod | krypto | 20020 | TCPv4 | |
| lockstep | lockstep | ????? | ????? | NOT RUNNING: Requires python2.5 and the md5 module |
| moatd | moat | 6810 | TCPv4 | |
| roflcode | roflcode | 4000 | TCPv4 | |
| sockringd | sockring | 14340 | TCPv4 | |
| supd | sup | ????? | ????? | NOT RUNNING |
| superd | super | 8126 | TCPv4 |
Other binaries I've come across that may have been part of this year:
- SupaFlyTNT
- Something that would have used a user named "nubbin"?
- Organizers: DDTEK
- Operating System: FreeBSD 7.2
| Service Name | User | Port | Protocol | Notes |
|---|---|---|---|---|
| baaaad | sheepc | ????? | ????? | NOT RUNNING: Unable to register (MESSAGEPROG, MESSAGEVERS, udp) |
| casino | casino | ????? | ????? | NOT RUNNING: syntax error on line 1 |
| cheese.pl | cheese | ????? | ????? | NOT RUNNING: Some web service..? Not sure I even have this on the VM right now... |
| cmd | cm | 4546 | TCPv4 | Requires cjd in /usr/local/sbin |
| deltad | delta | 1787 | TCPv4 | |
| deuced | deuce | 2056 | TCPv4 | |
| elfd | buddy | 7331 | TCPv4 | |
| lazrus | lazrus | 1905 | TCPv4 | |
| magicd | magic | 4343 | TCPv4 | |
| mdljserver | mdlj | ????? | ????? | NOT RUNNING: Requires a .pem, .crt, and .key file, fails to load private key, and subsequently dies with SSL ERROR (certs are currently in /home/mdlj but don't work) |
| mymqld | mymql | 4242 | TCPv4 | |
| nickd | nickster | 2337 | TCPv4 | |
| rsatesp | rsatesp | 5500 | TCPv4 | Requires sqlite3 package and has an auth.db created by createdb.sh in /home/rsatesp that don't appear to work |
| tucod | tuco | 57005 | TCPv4 | |
| wwcd | wwcd | 6977 | TCPv4 |
- Organizers: DDTEK
- Operating System: FreeBSD 8.0
| Service Name | User | Port | Protocol | Notes |
|---|---|---|---|---|
| cohend | cohend | 7532 | TCPv4 | |
| ddftpd | ddftp | 1776 | UDPv4 | |
| diablo | diablo | ????? | ???? | NOT RUNNING: Requires diablo-jvm 1.6.10 or something (might also require Launcher.class and a few other things?) |
| food | food | ????? | ???? | NOT RUNNING: Requires libutil.so.8 (and is a frozen python2.6 service that complains about no module named "_socket") |
| houdini | houdini | ????? | ???? | NOT RUNNING: This is a PE binary and I have no idea how it ever ran (WINE as a custom kernel module?) - very aptly named service |
| libra | libra | 1495 | TCPv4 | |
| mashup | mashup | 5539 | TCPv4 | |
| memix | memix | 9911 | ???? | NOT RUNNING: Appears to not be able to read a "local auth file" and is also missing the patch it downloaded from DDTEK's servers to make it vulnerable |
| mqdbd | mqdb | 2001 | TCPv4 | |
| nadel | nadel | 3248 | TCPv4 | |
| natord | nator | 2985 | TCPv4 | |
| noprotas | noprotas | 23945 | UDPv4 | |
| santad | santa | ????? | ???? | NOT RUNNING: Won't run for some reason...just prints "Done" |
| slickd | slick | 7391 | TCPv4 | |
| spelunk | spelunk | 8362 | TCPv4 | Requires adv.key and adv.rec in /home/spelunk |
| sushid | sushi | RAWv4 |
- Organizers: DDTEK
- Operating System: FreeBSD 8.2
NOTE: In addition to the services below, there was also a service called "finch" that interacted with some remote control cars in a chicken coop. To my knowledge, no team ever figured out how to score successfully (you were supposed to drive your car into the lighted area matching your car's color). Since "finch" was a Linux binary that was meant to run on your own machine, it isn't included below.
| Service Name | User | Port | Protocol | Notes |
|---|---|---|---|---|
| bowser | bowser | NONE | TCPv6 | Local service with usage: /usr/local/sbin/bowser <host> |
| bunny | bunny | 15323 | TCPv6 | |
| castle | castle | 7629 | TCPv6 | Requires sandy in /usr/local/sbin |
| cleaner | cleaner | 26987 | TCPv6 | |
| forgetu | forgetu | 3128 | TCPv6 | |
| gold | gold | 2069 | TCPv6 | |
| hiver | hiver | 44366 | TCPv6 | |
| htlame | htlame | 42737 | TCPv6 | |
| pisa | pisa | 6765 | TCPv6 | |
| rotary | rotary | 3375 | TCPv6 | |
| sheepster | sheepster | 5775 | TCPv6 | |
| telephone | bell | 1477 | TCPv6 | |
| tomato | tomato | 6391 | TCPv6 | |
| war | war | 14273 | TCPv6 |
- Organizers: DDTEK
- Operating System: FreeBSD 9.0
NOTE: All these services bound the interface em1 in the game, but I patched them to bind em0 for the VM to work.
| Service Name | User | Port | Protocol | Notes |
|---|---|---|---|---|
| cashew | cashew | 7979 | TCPv6 | |
| cherry | cherry | 24359 | TCPv6 | |
| coney | coney | 65214 | TCPv6 | |
| desheepd | desheepd | 547 | UDPv6 | |
| dog | dog | ????? | ???v6 | NOT RUNNING: Cannot open /usr/local/ctp/lib/perl5/5.16.0/i386-freebsd/CORE/libperl.so |
| gallows | gallows | 6666 | TCPv6 | |
| intception | dealer | 8888 | TCPv6 | |
| jerkin | jerkin | 63715 | TCPv6 | |
| mixology | mixology | 35575 | TCPv6 | |
| nom | nom | 7368 | TCPv6 | |
| nssds | nssds | 54339 | TCPv6 | |
| ocrd | ocrd | 31967 | TCPv6 | |
| parrot | parrot | ????? | ???v6 | NOT RUNNING: Cannot open /usr/local/ctp/lib/perl5/5.16.0/i386-freebsd/CORE/libperl.so |
| ralph | ralph | 57553 | TCPv6 | |
| scool | scool | 4637 | TCPv6 | |
| semem | semem | 6941 | TCPv6 | |
| tictactoe | tictactoe | 25375 | TCPv6 | |
| torqux | torqux | ????? | ???v6 | NOT RUNNING: Must be run with python2.7 directly (still doesn't seem to work?) |
| zul | zul | 25201 | TCPv6 |
In case you don't like the VM I've created, here's some quick documentation on how I set up the VM myself!
The initial setup is simple:
- Installed FreeBSD 9.1 with default options from the i386 install media
- Uncommented and set "PermitRootLogin" to "yes" in /etc/ssh/sshd_config with
vi - Ran
/etc/rc.d/sshd restartso I could SSH/SCP
NOTE: In the real CTF, each team would actually get a FreeBSD jail, rather than a VM. For simplicity, I've set everything up outside of a jail. I hope to find my documentation on jails and include it here in the future if anyone wants to set things up more authentically. For now, you'll just have to make do with this approximation.
Setting up services was a little more involved. In order to run a given service, you will generally have to create a user and home directory for that user. This is because most DEFCON CTF services will "drop" privileges from root to an unprivileged user specific to the service, just like real services. The ownership of the binary will also need to be changed to prevent unwanted modifications. To do this:
# create a user with a given name (-n), shell (-s), and home directory (-m)
pw useradd -n <username> -s /usr/bin/false -m
chmod 750 /usr/home/<username>
chown root:<username> /path/to/service
chmod 750 /path/to/service
Binaries before DEFCON 19 were located inside each service's home folder. Starting in DEFCON 19, however, they were
moved to /usr/local/sbin. Either approach is fine, but I found it easier to place all the services in
/usr/local/sbin.
Flags were typically stored in a file called "key" inside of each user's home directory. A kernel module was used to
change these out periodically (about once every 2-5 minutes or so). Since I don't have a similar kernel module, I just
placed the sha1sum of the service into the flag file:
sha1 /path/to/service | cut -d' ' -f4 > /usr/home/<username>/key
chmod 540 /usr/home/<username>/key
At this point, running the service should be as easy as:
/path/to/service &
You can check if it is running/listening by doing:
ps aux | grep <service> # check if it is running
sockstat | grep <service> # check if it is listening (and on what port)
If that doesn't work, check the table above to see if there are any caveats for a particular service. Some services require extra stuff to be installed, configured, or otherwise present in order for it to function. Some were also not actually network services and had to be run locally.
Once a service is running, you should be able to use netcat to connect to it:
nc <hostname or address> <port> # for IPv4
nc6 <hostname or address> <port> # for IPv6
Note that services won't start up by default unless you create an /etc/rc.d startup script for them. The template I
created for these, if you'd like to develop your own, is called rc_d_template in the top level of this repository.