We have PA-820's and I have been looking for a way to leverage them to block punycode attacks. In fact, we'd be pretty OK with blocking punycode URLs altogether. I just haven't been able to puzzle out a way to do it. If I add xn--* to the URL filter block list, it complains that I have multiple wildcards. If it add just xn-- the firewall accepts it, but it just doesn't work, nothing is blocked. It was the same result when I tried to create a custom URL category. Is this something that can even be done at the firewall level, or should I look to address this on the DNS side?
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I am going to assume this is for outbound traffic. If yes then there are several things to do in conjunction.
In your Vulnerability profile, enable DNSSink hole.
Next I would block by web category, blocking the obvious bad stuff.
abused-drugs, adult, alcohol-tobacco, command and control, copyright-infingment, crypto-currency, dynamic-dns, hacking, high-risk, insufficient-content, malware, medium-risk, newly-registered-domin, not-resolved, parked, phishing, private-ip-address, proxy avoidance and anonymizers, questionable, shareware and freeware, unknown, web-advertisements
Externally have only your DNS servers be able to go our and get external DNS requests. Also use a secure service such as OpenDNS, cloudflare, Quad9, etc. And block the end users from exiting your environment over DNS externally.
Setup external dynamic lists, along with the PAN builtin ones, i have the following setup.
Source on PAN support:
Sans notes on this:
Others listed on this site:
Make sure you are performing SSL decrypt to ensure you are seeing the traffic.
This should get you started and not having to use a wildcard to block everything.
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