URL Filtering Clarification - Wildcards behavior (implicit match on the rear of the URL)
cancel
Showing results for 
Search instead for 
Did you mean: 

URL Filtering Clarification - Wildcards behavior (implicit match on the rear of the URL)

L2 Linker

Figured I'd share this here as I already have on another platform.  Been using PanOS for ~8 years and came across something with URL filtering and wildcards.   URL filters with wildcards will match on the front, and back of the URL(implicit), if you don't use the trailing /. 

 

What this means is *.microsoft.com doesn't just match www.microsoft.com, but also www.microsoft.com.uk.  BUT, it also matches www.microsoft.com.malware.com (tested in a lab environment - feel free to test in yours) - it doesn't stop at domain 'extensions'  

 

Note - this is by design and something in PanOS release notes back to 5.x (that I was able to dig up), so nothing to open a case with PA for a bug.  

 

Not a huge issue with block lists as you'll just be blocking more than you intend to, but for allow lists - could be a bit of a problem.  Worth a review of your allow lists for sure, as custom categories will be processed before pandb classification.

 

 

https://docs.paloaltonetworks.com/pan-os/10-0/pan-os-admin/url-filtering/block-and-allow-lists.html

 

 

Use to indicate one or more variable subdomains. If you use 
*
, the entry will match any additional subdomains, whether at the beginning or the end of the URL. Use a forward slash at the end of the entry if you do not want to match any additional subdomains beyond that point.
Ex:

 

1 REPLY 1

Community Team Member

Hi @Chris_Johnston ,

 

Much appreciated ! Thanks for sharing !

 
Like what you see?

Show your appreciation!

Click Like if a post is helpful to you or if you just want to show your support.

Click Accept as Solution to acknowledge that the answer to your question has been provided.

The button appears next to the replies on topics you’ve started. The member who gave the solution and all future visitors to this topic will appreciate it!

These simple actions take just seconds of your time, but go a long way in showing appreciation for community members and the LIVEcommunity as a whole!

The LIVEcommunity thanks you for your participation!