rexec and bastion

[Kay Schluehr]

Cited from Python-doc ( v.2.3 )

[Warning:  In Python 2.3 these modules have been disabled due to
various known and not readily fixable security holes. The modules are
still documented here to help in reading old code that uses the rexec
and Bastion modules.]

My question about rexec and bastion may be anachronistic but I did not
found much explanation, why rexec and bastion are swiss cheese? It may
be helpfull to resume the problems to learn from them.

Ciao
    Kay