In today’s blog, we will discuss the newest features of F5’s Web Application Firewall (WAF), Application Security Manager (ASM). ASM has been around for quite some time, but with recent updates I thought it is worth discussion.

F5 Networks recently released version 12.1.1, the first long-term support release for version 12. If you haven’t read through the release notes, take a few minutes and do so. I am really excited by some of the most recent features and I would like to share some of them with you.

I was ecstatic to see Unified Policy Building in 12.0 because now you have one screen to view all learning suggestions. This makes it far easier to sort through. If your policy builds automatically or statically based on your custom thresholds, you now have only one screen to manage.

Following the style already set in ASM, there is a dropdown menu that allows you to select the policy for which you want to see suggestions. Tabbed across the top is also Enforcement Readiness, and they moved Learning and Blocking Settings here as well. This makes the overall flow better while making it easier to see which settings you have for each selected policy — no more bouncing around the mouseover menus.

Next up in 12.0 is Proactive Bot Defense. This is a set of additional features added to the Denial of Service (DoS) functions ASM already used. F5 added improved defense against unwanted browsers and browsing agents that are non-human initiated. CAPTCHA and javascript insertion does this, but with some caveats. If you use CORS (Cross-Origin Resource Sharing), like with AJAX calls, you will have issues and you should add those URLs to the bot whitelist.

F5 Networks also added malicious bot signatures. Now when you update your ASM application signatures, bot signatures are classified as malicious or benign. Just like with application signatures, you can create your bot signatures as well. You even have the ability to create signature sets with either malicious or benign classifications. This gives you greater control. Once created and applied via a “dos” profile, traffic is automatically classified and either accepted or discarded as configured.

Version 12.1 was not outshined by 12.0, and really cranked up the dial. It added more dos enhancements with the ability to track using device IDs. Now device IDs can use dos, brute force, and session hijacking. You can define bad behavior and set thresholds to classify traffic from them and either log or block them. F5 even extended Analytics to sort by these IDs. More reporting is always a good thing!

Using a similar set of metric definitions, you can now automatically blacklist IPs attacking your layer 7 resources and increase your dos footprint. This does not require use of IP intelligence or any other classification engine. This dos feature is through your config definitions. Adding IP intelligence, however, is a good thing in my opinion. I encourage you to look at it as more than just ASM.

Two huge new features in ASM are the ability to define methods per URL and support websockets per URL. In previous versions, methods were globally defined for an application. This is great news. For apps that might have only one page that support a POST, you can define it only for that page.

Websockets are new altogether. Websocket protocol allows client and server to stream data bidirectionally indefinitely. Websockets create a connection over HTTP, but then switch to a single TCP connection using message frames. This allows full duplex and low latency transport. Chances are you used these in your last internet chat. When you think of what could be hiding in one of those, protection really matters.

The last feature I want to mention is the ability for ASM to automatically detect and configure login pages in your application. If you have spent time parsing through someone else’s code to define a login page, you will welcome this feature. Now, that alone would be cool, but if you defined policy settings for brute force and session tracking, it will automatically add those options to the login forms it creates. This is a rockstar feature!

These are some of the main features ASM received in 12.0 and 12.1. There are still others like improved policy building, reduced policy building resource consumption, etc. Once again, if you have not reviewed the release notes, you should. I hope this generates a little interest in seeing what ASM has to offer now, and that you continue to find success in using F5 Networks Application Security Manager.

If you don’t already have ASM, consider what ASM can do for you. If you are already a Guidepoint Security customer and want to know more, reach out to your representative. If you are not a customer and would like to learn more, please feel free to contact us. We have several ASM certified engineers to answer your questions. For more information, email

About GuidePoint Security
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