topic Re: About SHA1 when admin access Web-UI in General Topics

About SHA1 when admin access Web-UI

KiCheon.Lee — Thu, 31 Dec 2015 06:35:01 GMT

Hello,

I knew SHA1 is going to be expired on all internet browser in 2016.

All FWs of Paloalto are using SHA1 when access Web-UI.

I think if PA keep using it on, administrator could not access Web-UI by browser bloking.

So It has to change from SHA1 to SHA256.

I just want to know plan when chainging it.

Please someone let me know it.

If you do not have a plan for it.

Do I have to make self-generated certificate with SHA256 and then enable "certificate for Secure Web GUI"?

Is there another way?

Thanks,

KC Lee

Re: About SHA1 when admin access Web-UI

syadav — Mon, 04 Jan 2016 14:04:05 GMT

Hi KC,

The deprecation of SHA-1 is completely browser dependent, though most of the major browsers (like firefox,chrome) are

contemplating to completely block the pages secured through SHA1. Please look for official announcements from the organizations who develop these browsers to keep a track of the timeline.

Following is a good read :

https://googleonlinesecurity.blogspot.sg/

As for PA ,WebGUI access or SSL decryption (forward-proxy) certificate, you can create a new certificate using a more secure hashing algorithm like SHA-256 which is acceptable for the browser hence would not block or through error.

Hope this helps !

Re: About SHA1 when admin access Web-UI

KiCheon.Lee — Tue, 05 Jan 2016 04:24:33 GMT

Hi syadav,

Thanks for your comment.

I have read a google blog page what you suggest.

This blog mentioned the following,

Step 2: Blocking all SHA-1 certificates

Starting January 1, 2017 at the latest, Chrome will completely stop supporting SHA-1 certificates. At this point, sites that have a SHA-1-based signature as part of the certificate chain (not including the self-signature on the root certificate) will trigger a fatal network error. This includes certificate chains that end in a local trust anchor as well as those that end at a public CA.

The Issuer is localhost for certificate when accessing Web-UI.

Chorme could not block SHA-1 certificate that issuer is localhost(self-generated) when accessing Web-UI after 2017. RIGHT?

Do I understand correct it?

Thanks