Difference between revisions of "Zmauditswatch"

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Revision as of 16:00, 1 October 2014

Admin Article

Article Information

This article applies to the following ZCS versions.

ZCS 8.5 Article ZCS 8.5ZCS 8.0 Article ZCS 8.0


Zmauditswatch

Description

Zmauditswatch notifies a specific e-mail address of a potential brute force attack if certain conditions are met. This powerful service can provides us a notification against brute force attacks, protecting our Zimbra Collaboration Infrastructure.

Configuration

zmauditswatch should be run by the user "zimbra". For use zmauditswatch we need to configure it first.

We need to crate this two files for save the parameters in the next step:

touch /opt/zimbra/conf/auditswatchrc
touch /opt/zimbra/conf/auditswatchrc.in

Once we have the previous files created, is time to configure the parameters of zmauditswatch:

zimbra_swatch_ipacct_threshold=10
zimbra_swatch_acct_threshold=15
zimbra_swatch_ip_threshold=20
zimbra_swatch_total_threshold=60
zimbra_swatch_notice_user email@domain.com

You can change any of this numbers for accommodate to your Environment, read the next section for understand each command.

Script Options Explanation

The script ships with 4 authentication failure checks.

  • (zimbra_swatch_ipacct_threshold) - IP/Account hash check which warns on 10 auth failures from an IP/Account combo within a 60 second window.
  • (zimbra_swatch_acct_threshold) - Account check which warns on 15 auth failures from any IP within a 60 second window. Attempts to detect a distributed hijack based attack on a single account.
  • (zimbra_swatch_ip_threshold) - IP check which warns on 20 auth failures to any account within a 60 second windows. Attempts to detect a single host based attack across multiple accounts.
  • (zimbra_swatch_total_threshold) - Total auth failure check which warns on 1000 auth failures from any IP to any account within 60 seconds. The recommended value on this is guestimated at 1% of active accounts for the Mailbox.
  • (zimbra_swatch_notice_user) - The email address that we want to be worn when all the conditions happens.

Activate

zmauditswatch is very easy to activate once we configured everything, we just need to start the script:

zmauditswatchctl start

We can stop it

zmauditswatchctl stop

Show the status

zmauditswatchctl status

Examples

Web Client

We will try to attack our Zimbra Lab with one username and bad password, 10 times: Zmauditswatch-001.png

The result will be that the user can't do login anymore for 15 minutes: Zmauditswatch-006.png

The Zmauditswatchctl will send a notification to the email address that we defined before: Zmauditswatch-002.png

If we open the mail, we'll obtain more information Zmauditswatch-003.png

SMTP

Sometimes we don't have a complete report of the SMTP fails, and we can be vulnerable under a brute force or Dictionary attack. With zmauditswatch enabled, we will be capable of obtain a email notification if we have an attack under SMTP.

The Zmauditswatchctl will send a notification to the email address that we defined before: Zmauditswatch-004.png

If we open the mail, we'll obtain more information Zmauditswatch-005.png

Log File

We can check into the log /opt/zimbra/log/zmauditswatch.out

zimbra@lab:~/bin$ tail -20 /opt/zimbra/log/zmauditswatch.out
*** auditswatch version 3.2.3 (pid:24029) started at Wed Oct  1 11:51:31 CEST 2014

IP:Acct failure threshold exceeded: X.X.X.X admin@labzimbra.zimbra.com
IP:Acct failure threshold exceeded: X.X.X.X admin@labzimbra.zimbra.com
Account failure threshold exceeded: X.X.X.X admin@labzimbra.zimbra.com
IP failure threshold exceeded: X.X.X.X exceeded threshold on failure for admin@labzimbra.zimbra.com


NOTE : Please configure with your own parameters the above script, it's an example. Consult the specific Release Notes for the version you upgraded to.


Verified Against: ZCS 8.0.x & 8.5.x Date Created: 10/01/2014
Article ID: https://wiki.zimbra.com/index.php?title=Zmauditswatch Date Modified: 2014-10-01



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