-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA512 Advisory ID: SYSS-2015-057 Product: Thru Managed File Transfer Portal Manufacturer: Thru Affected Version(s): 9.0.2 Tested Version(s): 9.0.2 Vulnerability Type: Cross-Site Scripting (CWE-79) Risk Level: Medium Solution Status: Fixed Manufacturer Notification: 2015-10-28 Solution Date: 2016-01-22 Public Disclosure: 2016-02-15 CVE Reference: Not yet assigned Author of Advisory: Dr. Erlijn van Genuchten (SySS GmbH) ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Overview: Thru Managed File Transfer Portal is a web based file transfer application. According to the Thru website [1], the application aims to offload large file transfer to a single platform, to protect files, to replace FTP servers and to allow access to files anytime, anywhere. The Thru Managed File Transfer application is vulnerable to HTML injection attacks. This allows users to send e-mails with malicious content to another user in the context of a trustworthy Thru e-mail. ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Vulnerability Details: The SySS GmbH identified a vulnerability in the "file upload" functionality for unauthenticated users. Here, it is possible to add a message that accompanies the uploaded file. A notification e-mail is sent to the receiving user, including this message. The described cross-site scripting vulnerability allows an attacker to send an e-mail to the victim with malicious content, for example a download link to a page owned by the attacker, in the context of a trustworthy Thru e-mail. ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Proof of Concept (PoC): The following HTTP POST request using the HTML code Click here to download your file." as the value for the parameter "uploadmessage" demonstrates that HTML code can be injected: POST /EmailCheck.aspx HTTP/1.1 Host: [HOST] Referer: https://[host]/Desktop/Dropbox/Create/? Content-Length: [content length] Cookie: [COOKIES] email=[e-mail]&ccEmails=&subjectemail=subject&uploadmessage%3dClick+here+to+download+your+file.&captcha=DropboxCreateCaptcha&captchaValue=4TH5C&captchaInstanceId=98ba49a8d3e94afe80a0e0dbf6df3e12&uploadprivatemessage= ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Solution: The reported security vulnerability has been fixed in a new software release. Update to the new software version. ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Disclosure Timeline: 2015-10-23: Vulnerability discovered 2015-10-28: Vulnerability reported to manufacturer 2016-01-22: Manufacturer announced update 2016-02-15: Public release of security advisory 2016-03-02: Public release of revised security advisory (corrected solution status) ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ References: [1] Thru Homepage http://www.thruinc.com [2] SySS Security Advisory SYSS-2015-057 https://www.syss.de/fileadmin/dokumente/Publikationen/Advisories/SYSS-2015-057.txt [3] SySS Responsible Disclosure Policy https://www.syss.de/en/news/responsible-disclosure-policy/ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Credits: This security vulnerability was found by Dr. Erlijn van Genuchten of the SySS GmbH. E-Mail: erlijn.vangenuchten@syss.de Public Key: https://www.syss.de/fileadmin/dokumente/Materialien/PGPKeys/Erlijn_vanGenuchten.asc Key ID: 0xBD96FF2A Key Fingerprint: 17BB 4CED 755A CBB3 2D47 C563 0CA5 8637 BD96 FF2A ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Disclaimer: The information provided in this security advisory is provided "as is" and without warranty of any kind. Details of this security advisory may be updated in order to provide as accurate information as possible. The latest version of this security advisory is available on the SySS Web site. ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Copyright: Creative Commons - Attribution (by) - Version 3.0 URL: http://creativecommons.org/licenses/by/3.0/deed.en -----BEGIN PGP SIGNATURE----- Version: GnuPG v1 iQIcBAEBCgAGBQJW1fanAAoJEAylhje9lv8q2dcP/i6YwJyDZSWXmu+k+HSlkOUL n7AnYgapB7r1OwJ3w3X7P7gU9JZlAwIXghD60Qe/Tz2KIwWgeVoASkzSG7VRMSML CB59MsMUdz/QALTlXvrdZxP7n8X/mhpU8pTMSoMvL2h19Bspve5S39JoAl2D3AnC AaRdb7IG7xO7A7ssKOfu04N16H0uiefkE6b8TRs46W8O4SbmeJiiCUkX8Ax+9zeA 5azA+Q7dOqQUkosq3x9hVMPZMe4H8QYkYSKJWLkaR38vFust0w/9Eea7ZUfFQh4K DH7dyItJzqtXk4e/J18mibnKPjDpeHapvyt8FMs1w+HlBEchALltJ6ucYtzwHGqa RilwzaGaW//ukm6SZWeaHQLOtE6j2dXeO64CDYRQFKxsoofVsdZ8dU8j+zsZQC1O 5W+LKrwCqK1H2aQUYLFd67S8g+qjbkHJemaZh1k8KHcbAw6j5C3sk+I0HtS6AOdx WV6W2q/iQ1aBrm6HBbcFIdXtCXe12MA4eDzZI2plhS3VqbMkFsxao9mKsrZ/sHo1 WOjcE/HF+nWFBVqzwNJJkJcXydUYc3kh/qweWc+LJG7h9YgX8esjbO8BspBmg6zN /z1nyaHjS4eqBpq4skEQjCKk19ZpOBdoOWE89hOExGmW9Ce96Cf6BTMPaWYG8Rzb KfvJPRNKUBiWmI6Rs33q =U1xf -----END PGP SIGNATURE-----