Sectigo CA Chain Decryption Issues

cancel
Showing results for 
Show  only  | Search instead for 
Did you mean: 

Sectigo CA Chain Decryption Issues

L0 Member

Due to the recent expiration of the Sectigo RSA CA cert (https://support.sectigo.com/articles/Knowledge/Sectigo-AddTrust-External-CA-Root-Expiring-May-30-202...) and our Palo firewall SSL decryption policy configuration to block expired certificates we are noticing that any website that is publishing the old expired CA chain (for example netaoc.org.uk) is being blocked due to them publishing an expired cert.

 

This is obviously working as expected however it's difficult for me to come into contact with each website hosting one of these invalid CA chains to get them to resolve the issue while our users experience issues and I manually exclude the sites from decryption.  I of course could turn off expired certificate blocking however this something I would rather not do.

 

I have noticed that web browsers like Chrome when not running through decryption are handling this issue just fine as they seem to look up the new correct CA certificate themselves and use that.  Is there a way I can configure out Palo to act in the same way or am I stuck being reliant on the web admins of the individual sites to correct their chain issues?

25 REPLIES 25

We proceeded almost the same, only difference is we're using minemeld with a dynamic list so we dont need to push on the firewall at each addition on the list.

L3 Networker

Same problem here.

Right now i only saw 1 site not working, but i guess more will follow.

I also set up a new decrypt policy with a new decrypt profile allowing expired certs and put custom url list in place as a workaround.

 

L4 Transporter

Looks like the official advisory is out, and the suggestions are to do the exemptions like most of us have been talking about already:  https://live.paloaltonetworks.com/t5/customer-advisories/decryption-errors-created-by-the-expired-ad...  What a mess.  Good luck w/ your exemptions everyone!

I like @Tarcizoa's idea of using an external dynamic list to manage these exceptions. We don't have minemeld but we can host a text file on an internal web server and just update the text file with any new exceptions. Then set the EDL to check for updates every 5 minutes. Sounds better than having to do commits every time a new site is discovered.

L0 Member

I received an update from TAC saying they also have an engineering request for this issue to identify if the PA behavior can be changed to accept the best root CA instead of the ones which are expired. They will keep us posted with the coming updates. 

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!