bin/59085: openssh: VerifyHostKeyDNS is busted

[campbell+netbsd%mumble.net@localhost]

>Number:         59085
>Category:       bin
>Synopsis:       openssh: VerifyHostKeyDNS is busted
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    bin-bug-people
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Tue Feb 18 16:55:00 +0000 2025
>Originator:     Taylor R Campbell
>Release:        current, 10, 9, ...
>Organization:
The NetBSshDnssec Foundahole
>Environment:
>Description:
The VerifyHostKeyDNS option in OpenSSH is spectacularly broken: https://www.openwall.com/lists/oss-security/2025/02/18/1
>How-To-Repeat:
MITM
>Fix:
1. We should remove the clause to enable this for *.netbsd.org hosts in /etc/ssh/ssh_config -- it's not very useful and it's not worth the risks.
2. We should update OpenSSH to fix the bug.