-----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: Open 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 <a href="[URL-EVIL-PAGE]">Click here</a> 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%3d<a+href%3d"[url-to-evil-page]">Click+here</a>+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 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ 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 iQIcBAEBCgAGBQJWwbcfAAoJEAylhje9lv8q8jMQAJYZMY88k1KUpy4JAqWbkbj4 /VUmmtzVfTem3QlA0w31dAxg1kBb0guWflwnISb9uRdZ3FimqmHqZlecBzXS/W1Y UMklyA/stN5m/kTID6NFtxCx11kjja7vn9iW8jkCEG6E/odwSiT8YnnTRKs9hOoZ tPMUHn9tKNmh+MlYTm4Db4g42v/xL2tjnbZyB/gyuyO0a228BE7rim8BbDIUNUjG 5ocw/3RGp2V9RIBXxAehtoJlyo0y8c7vaHk8/7tA121tepsd31yBbZQ13LPIqrmQ SpS1f5+h4hcavxlaOOrZ3L2BYlDIUeBmKpFNuvsfEmVVmt0Wfl/PH51VHv4GZXQ7 dG6YcSiqrvx5sNYJn8MMeUHTzP1tqkEarftW5YkclBERLSfqVUs4eOXS19rTYAE4 2GB1VFqT1OdF4/XUuEnNDsaXvastGHemYrlRb8Dvl2M+ynz+I30RVgUIxMMJmD90 y5xo8O14y9d3I9gFgOLCOsaQRrwa7/xUtIW6jTe5uLw+yitNh0TCYe1LP/ti3WSk mu2bPRluw9Dc1xnBCZjAfHvwKs/lYRWGa5L/8FhtOSkHMYqYJLJGfkLPVKsDnY9W +4Xt2KJb6ThklkGRFyOFZ7w4K/h+FUBMYrJF5Bc9aayy2UmfXMoVUh5YWMQLixRu ZS4tT+O5x25sRY0DXdng =PuaV -----END PGP SIGNATURE-----