misc/useless

This commit is contained in:
Oystein Kristoffer Tveit 2024-09-03 17:40:11 +02:00
parent 3fbaaa21b4
commit a8e4d04e5a
Signed by: oysteikt
GPG Key ID: 9F2F7D8250F35146
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$ ssh -p 51197 picoplayer@saturn.picoctf.net
The authenticity of host '[saturn.picoctf.net]:51197 ([13.59.203.175]:51197)' can't be established.
ED25519 key fingerprint is SHA256:DiJcS90U9QussLS8HLR6l6BGJb5eCA0vRmA18IvDvw8.
This key is not known by any other names.
Are you sure you want to continue connecting (yes/no/[fingerprint])? yes
Warning: Permanently added '[saturn.picoctf.net]:51197' (ED25519) to the list of known hosts.
picoplayer@saturn.picoctf.net's password:
Permission denied, please try again.
picoplayer@saturn.picoctf.net's password:
Welcome to Ubuntu 20.04.6 LTS (GNU/Linux 6.5.0-1023-aws x86_64)
* Documentation: https://help.ubuntu.com
* Management: https://landscape.canonical.com
* Support: https://ubuntu.com/advantage
The programs included with the Ubuntu system are free software;
the exact distribution terms for each program are described in the
individual files in /usr/share/doc/*/copyright.
Ubuntu comes with ABSOLUTELY NO WARRANTY, to the extent permitted by
applicable law.
picoplayer@challenge:~$ ls
useless
picoplayer@challenge:~$ ./useless
Read the code first
picoplayer@challenge:~$ cat useless
#!/bin/bash
# Basic mathematical operations via command-line arguments
if [ $# != 3 ]
then
echo "Read the code first"
else
if [[ "$1" == "add" ]]
then
sum=$(( $2 + $3 ))
echo "The Sum is: $sum"
elif [[ "$1" == "sub" ]]
then
sub=$(( $2 - $3 ))
echo "The Substract is: $sub"
elif [[ "$1" == "div" ]]
then
div=$(( $2 / $3 ))
echo "The quotient is: $div"
elif [[ "$1" == "mul" ]]
then
mul=$(( $2 * $3 ))
echo "The product is: $mul"
else
echo "Read the manual"
fi
fi
picoplayer@challenge:~$ man useless
useless
useless, -- This is a simple calculator script
SYNOPSIS
useless, [add sub mul div] number1 number2
DESCRIPTION
Use the useless, macro to make simple calulations like addition,subtraction,
multiplication and division.
Examples
./useless add 1 2
This will add 1 and 2 and return 3
./useless mul 2 3
This will return 6 as a product of 2 and 3
./useless div 6 3
This will return 2 as a quotient of 6 and 3
./useless sub 6 5
This will return 1 as a remainder of substraction of 5 from 6
Authors
This script was designed and developed by Cylab Africa
picoCTF{us3l3ss_ch4ll3ng3_3xpl0it3d_8504}