Page2Flip 2.5 Session Management
Posted on 25 August 2015
-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA512 Advisory ID: SYSS-2015-032 Product: Page2Flip Vendor: w!ssenswerft GmbH Affected Version(s): Premium App 2.5, probably also in Business App and Basic App, and in lower versions Tested Version(s): Premium App 2.5 Vulnerability Type: Broken Authentication and Session Management (CWE-930) Risk Level: High Solution Status: Open Vendor Notification: 2015-06-29 Solution Date: Public Disclosure: CVE Reference: Not yet assigned Author of Advisory: Dr. Erlijn van Genuchten (SySS GmbH) ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Overview: With the Page2Flip Web application, it is possible to create e-papers in PDF format that can be flicked through digitally. Such e-papers can be used for magazines, catalogues, flyers, etc. (see [1]). The Page2Flip app allows users to log in with valid credentials, even when their user accounts have been deleted. ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Vulnerability Details: The SySS GmbH was as an administrative user able to delete user accounts. However, these users were after that still able to login with their credentials when following the normal login procedure. ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Proof of Concept (PoC): Create a user account with known credentials, delete this account and login with these credentials. The POST request for deleting a user is: POST /settings/users HTTP/1.1 Host: [host] Faces-Request: partial/ajax Content-Type: application/x-www-form-urlencoded;charset=UTF-8 Content-Length: 1042 Cookie: [cookies] form_userSettings=form_userSettings&javax.faces.ViewState=-5924384961489816147%3A2243478473205355579&ice.window=9aib95sifa&ice.view=vvgml70e1&icefacesCssUpdates=&form_userSettings%3Aj_idcl=form_userSettings%3AuserTable%3A0%3AdeleteAccount%3Aactionicon&javax.faces.source=form_userSettings%3AuserTable%3A0%3AdeleteAccount%3Aactionicon&javax.faces.partial.event=click&javax.faces.partial.execute=%40all&javax.faces.partial.render=%40all&ice.window=9aib95sifa&ice.view=vvgml70e1&ice.focus=form_userSettings%3AuserTable%3A0%3AdeleteAccount%3Aactionicon&form_userSettings%3AuserTable%3A0%3AdeleteAccount%3Aactionicon=form_userSettings%3AuserTable%3A0%3AdeleteAccount%3Aactionicon&ice.event.target=bimg&ice.event.captured=form_userSettings%3AuserTable%3A0%3AdeleteAccount%3Aactionicon&ice.event.type=onclick&ice.event.alt=false&ice.event.ctrl=false&ice.event.shift=false&ice.event.meta=false&ice.event.x=1368&ice.event.y=373&ice.event.left=true&ice.event.right=false&ice.submit.type=ice.s&ice.sub mit.serialization=form&javax.faces.partial.ajax=true ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Solution: ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Disclosure Timeline: 2015-06-23: Vulnerability discovered 2013-06-29: Vulnerability reported to vendor 2015-07-07: Reported vulnerabilities again as the vendor did not respond to the first e-mail 2015-07-14: Reminder sent concerning reported vulnerabilities 2015-08-24: Public release of security advisory according to the SySS Responsible Disclosure Policy ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ References: [1] Page2Flip homepage http://page2flip.de/ [2] SySS Responsible Disclosure Policy https://www.syss.de/en/news/responsible-disclosure-policy/ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Credits: Security vulnerability found by Responsible Hacker 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.e -----BEGIN PGP SIGNATURE----- Version: GnuPG v1 iQIcBAEBCgAGBQJV2x28AAoJEAylhje9lv8q/egP/0vkbb4a+ku5dw/cv9Hx69Ui H0bdz1OrSrCQ9z1jXH8/b3mps4ZDxV87NNgxFyY0Z2DUp36JEIhdi/GpdgUUFPm4 XIe7J1u3HJ6z4M0PEWrFE/Uwx7stQi3nWAhXKKAL66ZwdT6nKlnHOmGTXf2EggS1 zvmd7nJkMPIfFZ0f1MEbAVMs90ofBqZlTEnB5Nv5sZVHyFnMdTMdfvgp5Xx4kNg/ ZYQqi/v2v3Zj79TfN0GPRJ+iWBfzinMVOnjLIRiX0i5+z99L5sQO7eELmQxiwbcm 4zq3smCGDSprguV5+WBarlH1uNGh+E6Rhfn3GkqkPpK622q6dkRSyzfDZ92Cqc6t YBLohkR/ypy/HNLOTefG4IOagwWIBzsPlk1W6bMOF1nUdqLW0DqDRsV5Toh2Qv6T n0ctOhTmEBi1vVGxEzGEjFgqjADuzXWpPVimZ/Zum4v2MgfN3QYAtkLTDaHIZMMB LOYHUvyJm3okpekqHE2ZzUPA5fYq5L2KeNdOidNM7/oUQHj5WYLmRXUbK5glvU4X +PTZcA6cxDsoK4rsu7AJR+H1lEEaCVbAP+7NOKi0geuVe98IKxuWU1BFOJiIa2Y8 qCh8Sz8HhzWrJDk81ob3fvFDdGrHuMBETlcs/m7EFPNvJMwkOY3BePAQacz+yGRt dPO8s21bf54II194Db0a =jPzu -----END PGP SIGNATURE-----
