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SOYAL 701 Server 9.0.1 - Insecure Permissions

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# Exploit Title: SOYAL 701 Server 9.0.1 - Insecure Permissions
# Date: 25.01.2021
# Exploit Author: LiquidWorm
# Vendor Homepage: https://www.soyal.com.tw https://www.soyal.com

Vendor: SOYAL Technology Co., Ltd
Product web page: https://www.soyal.com.tw | https://www.soyal.com
Affected version: 9.0.1 190322
                  8.0.6 181227

Summary: 701 Server is the program used to set up and configure LAN
and IP based access control systems, from the COM port used to the
quantity and type of controllers connected. It is also used for
programming some of the more complex controllers such as the AR-716E
and the AR-829E.

Desc: The application suffers from an elevation of privileges vulnerability
which can be used by a simple authenticated user that can change the
executable file with a binary of choice. The vulnerability exist due
to the improper permissions, with the 'F' flag (Full) for 'Everyone'
and 'Authenticated Users' group.

Tested on: Microsoft Windows 10 Enterprise


Vulnerability discovered by Gjoko 'LiquidWorm' Krstic
                            @zeroscience


Advisory ID: ZSL-2021-5633
Advisory URL: https://www.zeroscience.mk/en/vulnerabilities/ZSL-2021-5633.php


25.01.2021

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C:\Program Files (x86)\701Server>cacls McuServer.exe
C:\Program Files (x86)\701Server\McuServer.exe Everyone:F
                                               NT AUTHORITY\Authenticated Users:(ID)F
                                               NT AUTHORITY\SYSTEM:(ID)F
                                               BUILTIN\Administrators:(ID)F
                                               BUILTIN\Users:(ID)R
                                               APPLICATION PACKAGE AUTHORITY\ALL APPLICATION PACKAGES:(ID)R
                                               APPLICATION PACKAGE AUTHORITY\ALL RESTRICTED APPLICATION PACKAGES:(ID)R

C:\Program Files (x86)\701Server>
            
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