topic Re: MS Autodiscover Flaw - Vulnerability in General Topics

MS Autodiscover Flaw - Vulnerability

Qui — Sun, 26 Sep 2021 23:41:24 GMT

Hi All,

A design issue in the Microsoft Exchange Autodiscover feature can cause Outlook and other third-party Exchange client applications to leak plaintext Windows domain credentials to external servers

Domains that we need to block are listed here: https://github.com/guardicore/labs_campaigns/blob/84d8423335bf72ea078b5286db647580fb7f6a58/Autodiscover/autodiscover-tlds.txt

However , this list has over 9100 domains and some are not illegal chars.

Does any one find a way to edit/modify this list so it can be successfully imported into Palo FW?

Any suggestions are much appreciated.

Thanks

QLe

Re: MS Autodiscover Flaw - Vulnerability

LAYER_8 — Tue, 28 Sep 2021 13:34:56 GMT

If you have URL filtering on your firewall, why not create a custom URL category with an entry of: autodiscover.* with an explicit deny rule at the top of your security policy hierarchy? Way quicker than reformatting and importing an EDL.

Re: MS Autodiscover Flaw - Vulnerability

OtakarKlier — Tue, 28 Sep 2021 15:49:28 GMT

Hello All,

I would test to see if some of the URL's are already in PAN's URL or DNS filters. My opinion of vendors is that they need to update their signatures quickly to help protect their customers.

You can always open a support case and see if they have already added the signatures.

Regards,

Re: MS Autodiscover Flaw - Vulnerability

LAYER_8 — Tue, 28 Sep 2021 16:17:12 GMT

You are also able to log into the support portal and check our threat database for signatures associated with the CVE number.

Re: MS Autodiscover Flaw - Vulnerability

Qui — Wed, 29 Sep 2021 03:58:42 GMT

I previously checked the threat db for signatures associated with the CVE number but found none.

Maybe the threat is not that catastrophic.

Thanks