DNS over HTTPS (DoH): A DNS Security Issue?

Sam Lanfranco lanfran at YORKU.CA
Tue Nov 19 15:25:14 EET 2019


I could do with some expert opinion and enlightenment here. From what I
read the following move is likely to have a negative effect on the security
of the DNS system.

>From circleID: Microsoft Announces Plans to Adopt DoH in Windows
	Microsoft announced today its plans to adopt DNS over HTTPS (DoH) protocol
in Windows and will also keep other options such as DNS over TLS (DoT) on
the table for consideration. "[S]upporting encrypted DNS queries in Windows
will close one of the last remaining plain-text domain name transmissions
in common web traffic," noted company in a post." Microsft further added
(https://circleid.us15.list-manage.com/track/click?u=71b27c0808a16ff6f58bfc4fc&id=0acb188067&e=a464e87593):
"For our first milestone, we'll start with a simple change: use DoH for DNS
servers Windows is already configured to use. There are now several public
DNS servers that support DoH, and if a Windows user or device admin
configures one of them today, Windows will just use classic DNS (without
encryption) to that server. However, since these servers and their DoH
configurations are well known, Windows can automatically upgrade to DoH
while using the same server." 
For commentary on the issue:
https://www.zdnet.com/article/dns-over-https-causes-more-problems-than-it-solves-experts-say/
(https://www.zdnet.com/article/dns-over-https-causes-more-problems-than-it-solves-experts-say/)

Sam L.

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