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DNS Debugging; MSFT Zero Trust DNS; MSFT Graph API Abuse

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ISC StormCast for Monday, May 6th, 2024

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DNS Debugging with nslookup
https://isc.sans.edu/diary/nslookups+Debug+Options/30894/

Microsoft Plans DNS Lockdown
https://techcommunity.microsoft.com/t5/networking-blog/announcing-zero-trust-dns-private-preview/ba-p/4110366

Microsoft Graph API Abuse
https://symantec-enterprise-blogs.security.com/blogs/threat-intelligence/graph-api-threats

SANSFIRE SEC522 Defending Web Applications
https://www.sans.org/cyber-security-training-events/sansfire-2024/

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Discussion

Regarding MSFT DNS zero-trust topic in today's podcast: I have implemented a similar strategy on the firewall in my network. I provide internal DNS resolvers via DHCP. These server support either plain DNS or DNS over TLS.

All outgoing traffic from any devices other than these resolvers to ports 53 or 853 is blocked. The resolvers connect only to specific upstream DNS servers with DNS over TLS and verified using DNSSEC. So there is no traffic leaving the network on port 53. The only outgoing traffic on 853 is to a specific list of servers. The objective here is to be able to audit all internal DNS requests.

The problem is DNS over HTTPS. In an effort to restrict this, I have blocked port 443 to a list of known DNS servers. But this is a moving target.

Any suggestions for either a regularly updated list of common DNS severs or a better way to block DNS over HTTPS?

Posted by Otter on Mon May 06 2024, 15:15

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