https://bugzilla.mindrot.org/show_bug.cgi?id=3470

Darren Tucker <[email protected]> changed:

           What    |Removed                     |Added
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                 CC|                            |[email protected]

--- Comment #1 from Darren Tucker <[email protected]> ---
In the past, ssh(1) could be installed setuid root (for a couple of
reasons mostly relating to hostbased and rhosts authentication). 
Referencing home directories by environment variables under those
conditions would be a potential security problem.

Rhosts auth is long gone, hostbased auth has used a small setuid helper
(ssh-keysign) for many years, and a few years ago (in v7.8) we removed
support for installing ssh as setuid.

So yes there was a reason for it, but that reason is no longer there. 
Changing the behaviour would be a potentially incompatible change,
however, so would need to be considered carefully.

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