AsusWRT LAN Unauthenticated Remote Code Execution
The HTTP server in AsusWRT has a flaw where it allows an unauthenticated client to perform a POST in certain cases. This can be combined with another vulnerability in the VPN configuration upload routine that sets NVRAM configuration variables directly from the POST request to enable a special command mode. This command mode can then be abused by sending a UDP packet to infosvr, which is running on port UDP 9999 to directly execute commands as root. This exploit leverages that to start telnetd in a random port, and then connects to it. It has been tested with the RT-AC68U running AsusWRT Version 22.214.171.124.380.7743.
- Pedro Ribeiro <pedrib [at] gmail.com>
- AsusWRT < v126.96.36.199.384.10007
To display the available options, load the module within the Metasploit console and run the commands 'show options' or 'show advanced':
msf > use exploit/linux/http/asuswrt_lan_rce msf exploit(asuswrt_lan_rce) > show targets ...targets... msf exploit(asuswrt_lan_rce) > set TARGET <target-id> msf exploit(asuswrt_lan_rce) > show options ...show and set options... msf exploit(asuswrt_lan_rce) > exploit