As a first step I tried to make sure this actually is a change in openssh.
Because my reading of the issues referred above has shown that not all of the
verification is done inside ssh but partially in glibc.
So I upgraded on the bionic test system step by step.
The upgrade dependency list for openssh-client is "libc-bin libc6
libgssapi-krb5-2 libkrb5-3 libkrb5support0 locales"
I found that the bug is reproducible with openssh-client
1:7.6p1-4ubuntu0.3 running against the newer glibc.
I can switch in/out the reported bug be switching on a Bionic system between
glibc
2.27-3ubuntu1.2 - Bionic - Good
2.31-0ubuntu9.1 - Focal - Bad
** Also affects: glibc (Ubuntu)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/1898590
Title:
Verify DNS fingerprints not working
Status in glibc package in Ubuntu:
New
Status in openssh package in Ubuntu:
Confirmed
Bug description:
When setting in /etc/ssh/ssh_config VerifyHostKeyDNS to yes the fingerprints
are fetched, but the result is always:
debug1: found n insecure fingerprints in DNS
With dig +dnssec -tsshfp hostname the result is ok: ad flg is set.
To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/glibc/+bug/1898590/+subscriptions
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