FortiGuard and SD-WAN Security Insights

Well, here I am with my third cup of coffee, getting down to writing some more thoughts on FortiGuard and SD-WAN Security, finally! I’ve been playing this game since the early 90s having started as a network admin in 93, dealing with network and mux deployments over PSTN lines (yeah, I’m that old school). The Slammer worm hell? Oh yeah, your firewall was just a screen door back then, I lived it first-hand. Fast forward some — I’m now the owner of P J Networks, a security consulting company that recently helped three banks firm up their zero-trust architectures. I’m just home from DefCon and the hardware hacking village, where I’ve spent hours upon hours, enveloped in the eminence of #badgelife. That energy, that exploration, it never leaves you.

Understanding FortiGuard and SD-WAN

Let’s talk FortiGuard and SD-WAN. Here’s the thing: SD-WAN is good for flexibility, but that flexibility can be a double-edged sword. Without robust threat intelligence, those branches and remote sites stand out as low-hanging fruit to attackers. The threat intelligence FortiGuard security services deliver to your SD-WAN is what you actually want—not fluf.

Threat Landscape

The threat landscape today is a friggin jungle. Ransomware, phishing, DDoS — the trifecta — all the out there pummeling networks like nonstop rush-hour traffic. And SD-WAN? It’s broadening your attack surface since you’re really creating multiple lanes into your enterprise network. Yes, SD-WAN gives you agility and simplification of management, but it also introduces risk if you aren’t plugged into an efficient and current threat intelligence system.

Remember the Slammer worm? It was ready to pounce on vulnerabilities, fast — fast as a short-order chef chopping veggies on a crowded meal prep. The threats we face today eclipse the speed of those old threats and frequently utilize evasion techniques. Without an awareness of new emerging threats in real-time, your SD-WAN is nothing more than a shiny car without brakes.

FortiGuard Overview

This puzzle is solved by the Fortinet offering, FortiGuard. More than a straightforward feed of attack signatures. This service leverages a constantly updated database of actively exploited security intelligence, providing greater accuracy of detection. Think of it as a radar system that scans the horizon and says not just what direction the storms are coming from but where they will hit and when.

What really sets FortiGuard apart:

• Up to the minute threat signature updates
• Real-time behavioral analytics
• So AI, so ML are buzzwords here, yes, but FortiGuard relies way more first on the wisdom of humans and global telemetry. (I’m always careful when someone screams AI powered as if it were a magic pill.)
• Interoperates with Fortinet security fabric; provides automatic, intuitive enforcement and strong, secure protection for your SD-WAN application

Policy Integration

Policy consistency is a bear of a problem to solve when it comes to security in SD-WAN. Imagine you have 30 branches. Each has its own eccentricities and legacy devices — you really can’t have holes in enforcement.

FortiGuard feeds feed directly into your FortiGate devices, which PJ Networks provisions on your behalf to consume these feeds. That means policies are updated to reflect the most current intelligence. No tedious manual rule changes.

Here’s what happens:

• Threat signatures are pushed in real time
• Policies change in near real time
• Dynamic blocking using firewall rules, no need to wait for your sysadmin to notice an attack in progress

For instance, in a recent case with a multi-national bank, such automation saved them big time. Their SD-WAN edges were protected by updated policies within hours of a zero-day exploit — without any manual intervention.

Automated Updates

This is where the FortiGuard excels in SD-WAN deployments. Manual updates? Outdated approach. By the time a change is pushed out to the fleet, hackers have often moved on to the next vulnerability.

FortiGuard automates:

• Signature updates
• Zero-day protection feeds
• Classification of web and app traffic

But — and this is crucial — you still have to keep an eye on such updates. We at P J Networks SOC, do not Copy and paste. These updates send alerts that pop on our dashboards and our team is immediately reviewing anomaly spikes. There is no substitute for automation, however, and having automation cuts down on the window of time in which your network is vulnerable.

Incident Response

There’s not one silver bullet, not one panacea that means you can’t get breached. But it’s how quickly you detect and respond that matters most.

Threat intelligence from FortiGuard enriches your logs and alerts providing your SOC with detailed context about attacks that are targeting your SD-WAN.

And since we set up and track those feeds for multiple clients — including those very same banks I mentioned — we can:

• Rank order of alerts by threat severity
• Correlate events between endpoints and SD-WAN edges
• Automatically responding to events by the issues at hand (eg: automatically adding people to an IP block black list, or an automatic quarantine for x amount of time)

Look—I’ve been doing this long enough to recognize that, the incident response? — It’s where a lot of SG teams just crumble. It’s not sexy but it’s crucial. It is containable, thanks to rich intel from FortiGuard.

PJ Networks SOC

Now, here is a little behind the scenes look – we at P J Networks don’t mess around with FortiGuard feeds. When we turn on such services for clients, we don’t switch them on and hope for the best. Instead:

• Our SOC analysts tweak the feeds for client environments – because let’s face it – false positives suck
• We monitor traffic and patterns for signs of compromise
• And we marry it with alerting from SD-WAN with logs from the endpoint and cloud to have a full picture

That orchestration wouldn’t be feasible if we had to rely on a clunky, slow threat update. FortiGuard keeps us up-to-date about threat frontlines.

Quick Take

• SD-WAN broadens your attack service – FortiGuard threat intelligence is critical to maintain those lanes safe
• Automation and policies relieve human error — and time under attack is precious
• Real world experience (banks, enterprises) demonstrates how early intel can stop the zero-day damage
• PJ Networks tunes and watches these threat feeds—because one size never fits all
• Don’t trust AI-powered claims blindly — human-led intelligence and curated feeds are still king

Final Thoughts

And I know that people will counter with local firewall logs or on-prem SIEMs for threat intel. Yes, local numbers are informative but ultimately an extremely limited data set. Here’s a hot take: If you think local detection alone is going to protect your SD-WAN, it’s about as effective as trusting the dome light in your old two-door to guide you through a foggy mountain pass. You need a system which can see that broader picture that’s starting to come into focus, see the obstacles that are just up the road, and let you know the dangerous terrain that approaches before you whack into it.

FortiGuard global threat intelligence is that system. When combined with a well-architected SD-WAN — and a vigilant SOC like ours — it’s your best line of defense.

Oh, and one final grumble before I go – review your password policies. They frequently are worse than useless when they impose predictable patterns on users. Spend your cycles on layered controls, solid MFA, and continuous threat intel feeds like FortiGuard, rather than odd-ball password rules.

OK, let’s refill — security is a marathon, not a sprint. But when you have tools like FortiGuard, your SD-WAN solution can be less of a chore and more of a shield.

Stay safe out there.

— Sanjay Seth
P J Networks Pvt Ltd
Since the 00’s to provide information security consultancy