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help custom policy brute force attack asm!!

omar_padilla
Altostratus
Altostratus

hello I have problems thinking about how to make a restriction for the search of a value, in a form I have a field called account number and a search button, you want to limit that search to only 3 attempts, think of the brute force policy attack but there is a login, ie a username and password and depending on that applies the policies, in my case I do not want a login because I have only one parameter, when I make 3 attempts to block the page for 60 min or something Like the brute force attack policy, could you guide me how can I do that?

 

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6 REPLIES 6

Hello Omar.

 

You need to configure Brute Force Protection.

Depends on your release, you have this:

 

Another example of configuration

REF - https://clouddocs.f5.com/training/community/waf/html/class8/module2/lab2.html

 

In your approach, I would use "email" field as username and "account" as password (check your html tags)

Use the access validation to let the application knows when someone introduce one field just for testing (maybe one specific field in the server response).

 

Let me know if it helps.

 

KR,

Dario.

Regards,
Dario.

omar_padilla
Altostratus
Altostratus

That functionality if tested, works well for the login but in this case just fill in a field to find the number of accounts, in the url login of the f5 require 2 login and passwprd parameters, if I add the account number parameter and the other I leave it empty it doesn't work

Yes, you need to identify the user someway.

If you cannot do it with the email or another field in the form, I recommend you to modify the html to include a hidden field with information of the user (maybe cookie or something else).

 

Let me know if this helps.

 

KR,

Dario.

Regards,
Dario.

BTW, if you only want to block attempts by source IP you can do it using an iRule (counting the number of attempts and include those source IPs in a blacklist).

Regards,
Dario.

 

I find it interesting to do it by irule, I am trying to think in the appropriate way to do it, I understand that the http protocol is stateless so I suppose that for each search of an account a new connection is initiated, I know that I must call the http_request event to to be able to use the logic of finding the resource that I want to limit.

but how can I save in a variable that counts the number of queries to that resource, if in each request a new CLIENT_ACCEPTED event is executed {, will I have to validate it with the coockie?

 

Hello Omar.

 

Here you have an idea of how to solve your problem.

https://devcentral.f5.com/s/articles/iRule-for-Brute-Force-Password-Guessing-Attacks

 

KR,

Dario.

Regards,
Dario.