old-06 -- PHP (Base64)
URL: https://webhacking.kr/challenge/web-06/?view_source=1
<?php
include "../../config.php";
if($_GET['view_source']) view_source();
if(!$_COOKIE['user']){
$val_id="guest";
$val_pw="123qwe";
for($i=0;$i<20;$i++){
$val_id=base64_encode($val_id);
$val_pw=base64_encode($val_pw);
}
$val_id=str_replace("1","!",$val_id);
$val_id=str_replace("2","@",$val_id);
$val_id=str_replace("3","$",$val_id);
$val_id=str_replace("4","^",$val_id);
$val_id=str_replace("5","&",$val_id);
$val_id=str_replace("6","*",$val_id);
$val_id=str_replace("7","(",$val_id);
$val_id=str_replace("8",")",$val_id);
$val_pw=str_replace("1","!",$val_pw);
$val_pw=str_replace("2","@",$val_pw);
$val_pw=str_replace("3","$",$val_pw);
$val_pw=str_replace("4","^",$val_pw);
$val_pw=str_replace("5","&",$val_pw);
$val_pw=str_replace("6","*",$val_pw);
$val_pw=str_replace("7","(",$val_pw);
$val_pw=str_replace("8",")",$val_pw);
Setcookie("user",$val_id,time()+86400,"/challenge/web-06/");
Setcookie("password",$val_pw,time()+86400,"/challenge/web-06/");
echo("<meta http-equiv=refresh content=0>");
exit;
}
?>
<html>
<head>
<title>Challenge 6</title>
<style type="text/css">
body { background:black; color:white; font-size:10pt; }
</style>
</head>
<body>
<?php
$decode_id=$_COOKIE['user'];
$decode_pw=$_COOKIE['password'];
$decode_id=str_replace("!","1",$decode_id);
$decode_id=str_replace("@","2",$decode_id);
$decode_id=str_replace("$","3",$decode_id);
$decode_id=str_replace("^","4",$decode_id);
$decode_id=str_replace("&","5",$decode_id);
$decode_id=str_replace("*","6",$decode_id);
$decode_id=str_replace("(","7",$decode_id);
$decode_id=str_replace(")","8",$decode_id);
$decode_pw=str_replace("!","1",$decode_pw);
$decode_pw=str_replace("@","2",$decode_pw);
$decode_pw=str_replace("$","3",$decode_pw);
$decode_pw=str_replace("^","4",$decode_pw);
$decode_pw=str_replace("&","5",$decode_pw);
$decode_pw=str_replace("*","6",$decode_pw);
$decode_pw=str_replace("(","7",$decode_pw);
$decode_pw=str_replace(")","8",$decode_pw);
for($i=0;$i<20;$i++){
$decode_id=base64_decode($decode_id);
$decode_pw=base64_decode($decode_pw);
}
echo("<hr><a href=./?view_source=1 style=color:yellow;>view-source</a><br><br>");
echo("ID : $decode_id<br>PW : $decode_pw<hr>");
if($decode_id=="admin" && $decode_pw=="nimda"){
solve(6);
}
?>
</body>
</html>Do the same but with correct creds:
<?php
function obfuscate($val) {
$val = str_replace("1", "!", $val);
$val = str_replace("2", "@", $val);
$val = str_replace("3", "$", $val);
$val = str_replace("4", "^", $val);
$val = str_replace("5", "&", $val);
$val = str_replace("6", "*", $val);
$val = str_replace("7", "(", $val);
$val = str_replace("8", ")", $val);
return $val;
}
$id = "admin";
$pw = "nimda";
for($i=0;$i<20;$i++){
$id = base64_encode($id);
$pw = base64_encode($pw);
}
$id = obfuscate($id);
$pw = obfuscate($pw);
echo $id . PHP_EOL;
echo '----------------------------' . PHP_EOL ;
echo $pw . PHP_EOL;Change cookies, refresh and pwn:
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