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