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ekoparty ctf 03.11.2023

challenge files are on gopher web server. Use preferably lynx to connect to gopher server, but firefox works too.

  • gopher service: go.ctf.site:10070

UUEncrypted

files are found on gopher site at:

put them together and decrypt them with uudecoder like:

sky

given: Will you be able to sky down the hill and avoid the monster? Play the game and get some points!

go.ctf.site:10070

# download skifree.exe:
wget http://go.ctf.site:10070/GAMES/skifree.exe

# check what it is: 
file skifree.exe
skifree.exe: MS-DOS executable, NE for MS Windows 3.x (3.0) (EXE)  # output

to run skifree.exe:

  1. download: https://github.com/otya128/winevdm
  2. now skifree.exe can be run natively in windows 10
  3. flag is received when winning game

who

given: "My friend Daniel has a secret between his fingers!" and go.ctf.site:10079

# download skifree.exe
wget http://go.ctf.site:10070/GAMES/skifree.exe

# first enumerate:
nmap -A -Pn -sV -vvv go.ctf.site -p 10079

# result:
# PORT      STATE SERVICE REASON  VERSION
# 10079/tcp open  finger  syn-ack Linux fingerd
# |_finger: No one logged on.\x0D
# Service Info: OS: Linux; CPE: cpe:/o:linux:linux_kernel

# use finger-user-enum perl script to get intel on user daniel
./finger-user-enum.pl -u daniel -p 10079 -t go.ctf.site

resources:

not slack

given: Communication is at the base of human progress, specially in tecnhology. We invite you to join the oldest and haxoristic network on the Internetz and read the message of the day!

go.ctf.site:16667

# first check what is running on port 16667
nmap -A -Pn -sV -vvv go.ctf.site -p 16667

# result:
# PORT      STATE SERVICE REASON  VERSION
# 16667/tcp open  irc     syn-ack
# | irc-info:
# |   users: 40
# |   servers: 2
# |   ops: 7
# |   chans: 32
# |   lusers: 33
# |   lservers: 1
# |   server: go.ctf.site
# |   version: UnrealIRCd-6.1.2.3. go.ctf.site
# |   source ident: nmap
# |   source host: CAF3F7A2.F600E4E1.D3E25E07.IP
# |_  error: Closing Link: ucnojxiro[212.95.31.145] (Quit: ucnojxiro)
# Service Info: Host: go.ctf.site

connect to IRC with IRC client like HexChat and type /motd to receive the message of the day and first IRC flag.

rulez

type: /rules to get server rules and rulez flag

admin

type: /admin to get server admins and admin flag

private

type: /list to get list and topic of channels on server. The topic of the #private channel is the flag

also: /topic #private, /msg ChanServ info #private

whois

tpye: /whois hds in #admin channel to get flag

resources

writeups: