/bin/6 downloader

[xero]

Entry Info

• Date: 10.21.25
• BGGP Challenge(s): 5+6
• Name: xeR0 / x0
• Contact Info: x@xero.style
• Online Presence: https://x-e.ro
• This is my first entry!

Challenge

from the rules:

• Download Challenge
  • Download the text file
  • Display the file's contents in some way
• Recycle Challenge
  • Be 4096 bytes or less
  • Files must also print, return, or otherwise display the value "6" for identification when opened or executed

Target Software and Version

bash / any

Environment Setup

• local: chmod +x six
• remote create 6 file

File Contents

six / downloader

encoded contents (larger than my entry):

ZXhlYyAzPD4vZGV2L3RjcC8kMS84MDtwcmludGYgIkdFVCAvNiBIVFRQLzEuMFxyXG5Ib3N0OiQxXHJcblxyXG4iPiYzO2RkPCYzO2V4ZWMgMzwmLQo=

raw contents:

exec 3<>/dev/tcp/$1/80;printf "GET /6 HTTP/1.0\r\nHost:$1\r\n\r\n">&3;dd<&3;exec 3<&-

File Info

• Target File Type: bash/zsh
• Target File Size: 86b
• SHA256 Hash: 043d0ab504d71d6b752f56474ede9148f5293bc25d41ddf0ad72f3651e0b96c1
• Notes: No external tools, pure bash

Usage

run with a shell and domain param
bash ./six 0w.nz

or pipe it back into the shell. same diff

bash ./six 0w.nz | bash

BONUS ROUND! for some fun, i've created a special 6 file

6 / runner

server-side file for downloader to view/run

File Info

• Target File Type: posix sh, bash, zsh, plain text (e.g. cat)
• Target File Size: 2.7k (raw)
• SHA256 Hash: 3ea22f5261fa3b4c357ff286bc2bf027e967d5205032d1f65696ad6ee7c8143e
• Notes: No external tools, pure sh

encoded contents

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Usage

cat 6 or run it ./6