URVE Software Build 24.03.2020 Missing Authorization

2020.12.30
Risk: Medium
Local: No
Remote: Yes
CWE: CWE-862


CVSS Base Score: 8.5/10
Impact Subscore: 7.8/10
Exploitability Subscore: 10/10
Exploit range: Remote
Attack complexity: Low
Authentication: No required
Confidentiality impact: Partial
Integrity impact: None
Availability impact: Complete

-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA512 Advisory ID: SYSS-2020-041 Product: URVE Software Manufacturer: Eveo Sp. z o.o. Affected Version(s): Build "24.03.2020" Tested Version(s): Build "24.03.2020" Vulnerability Type: Missing Authorization (CWE-862) Risk Level: High Solution Status: Open Manufacturer Notification: 2020-11-10 Solution Date: 2020-11-18 Public Disclosure: 2020-12-23 CVE Reference: CVE-2020-29551 Authors of Advisory: Erik Steltzner, SySS GmbH Christoph Ritter, SySS GmbH ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Overview: URVE is a system for reserving rooms which also provides a web interface with event scheduler. The manufacturer describes the product as follows (see [1] and [2]): 'Booking rooms on touchscreen and easy integration with MS Exchange, Lotus, Office 365, Google Calendar and other systems. Great looking schedules right at the door. Fight conference room theft with our 10" touchscreen wall-mounted panel.' 'Manage displays, edit playlists and HTML5 content easily. Our server can be installed on any Windows and works smoothly from web browser.' ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Vulnerability Details: It is possible to access many different files without authentication in an unauthorized way. These files are partly PHP scripts which can potentially cause damage. ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Proof of Concept (PoC): Using the following path, it is possible to shut down the system: _internal/pc/shutdown.php Among others, the following files and scripts are also accessible: _internal/pc/abort.php _internal/pc/restart.php _internal/pc/vpro.php _internal/pc/wake.php _internal/error_u201409.txt _internal/runcmd.php _internal/getConfiguration.php ews/autoload.php ews/del.php ews/mod.php ews/sync.php utils/backup/backup_server.php utils/backup/restore_server.php MyScreens/timeline.config kreator.html5/test.php addedlogs.txt ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Solution: When processing a request, it should be checked whether the requesting actor is authorized to access the resource. ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Disclosure Timeline: 2020-10-28: Vulnerability discovered 2020-11-10: Vulnerability reported to manufacturer 2020-11-18: Patch released by manufacturer 2020-12-23: Public disclosure of vulnerability ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ References: [1] Product Website for URVE https://urve.co.uk/system-rezerwacji-sal [2] Product Website for URVE https://urve.co.uk [3] SySS Security Advisory SYSS-2020-041 https://www.syss.de/fileadmin/dokumente/Publikationen/Advisories/SYSS-2020-041.txt [4] SySS Responsible Disclosure Policy https://www.syss.de/en/news/responsible-disclosure-policy/ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Credits: This security vulnerability was found by Erik Steltzner and Christoph Ritter of SySS GmbH. E-Mail: erik.steltzner@syss.de Public Key: https://www.syss.de/fileadmin/dokumente/PGPKeys/Erik_Steltzner.asc Key ID: 0x4C7979CE53163268 Key Fingerprint: 6538 8216 555B FBE7 1E01 7FBD 4C79 79CE 5316 3268 E-Mail: christoph.ritter@syss.de Public Key: https://www.syss.de/fileadmin/dokumente/PGPKeys/Christoph_Ritter.asc Key ID: 0x05458E666D35EAE8 Key Fingerprint: 9FB0 1B9B 2F72 3DD5 3AF3 62D8 0545 8E66 6D35 EAE8 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ 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 website. ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Copyright: Creative Commons - Attribution (by) - Version 3.0 URL: http://creativecommons.org/licenses/by/3.0/deed.en -----BEGIN PGP SIGNATURE----- iQIzBAEBCgAdFiEEZTiCFlVb++ceAX+9THl5zlMWMmgFAl/i+1MACgkQTHl5zlMW Mmh8TQ/+OOXO4wrTs1udBFKgshYd7uhwxYv2S+FEZEg1sHXjJ8yy92lxzvi9x8Yr UmOGkILJMy0OPZKFUG+pMTpZ3+FVAvRPxK50GM2eC9F4cbRiz0N+N34ypL/r3UqO iphpbbvlS67o7DfR8Jp0OcAAQ34vzbNE+LUDVvmyc/WxyCTk9SXOtrQflmK0Re9e QRDcUmPNlkTyCfN4wV5VQHpJ+rhCnMg8LTle2k9EgTTyrWreqH2spG+xqr8vgWbe 5Tj07dQo9qE5oQDvkZcQGUkDi2+mmu6iFaHsVNOwtxHJbNJkfyG5ZYwURanjSuQn gb8Qx6vx9EqHSxtEw7g1SrtY2eJ/G/5XxQjR5T37Ouu9cAfcC4kk/+RJU4FggucU 2Zvkf/fXdCaYVElBQRpeZUo+gQ2xpC+/4DdIpoG7XI5iFg9YKaGcjqKNx4l5lbZ1 zMkumuyrjdf5kf8bQm+fav3LKc58G6J8RUnh0r5RtLSpPNMwcfX5Bf1fs2G5p6VK FRU5oI+TZOSeNgF/xLlbautyYNo4AqRGN9DlYo9PPsPSKsRxvV+3gwjxdCAHfyi7 YBGg0iGFosmNsHpb4hxwnn/h01/zHSubIIakv7fJIYU+iZDDhcyVDVN098FUAkWv RqZz0JLwpOWTxLeEk2Ub0d7nHb8tuYCQvk2Y4TdwP4plJanZ4bs= =NhQE -----END PGP SIGNATURE-----


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