normally uses to restore the previous role
setting after an error.  This allowed ordinary users to acquire superuser
status, for example.
The escalation-of-privilege risk exists only in 8.1.0-8.1.2.
However, in all releases back to 7.3 there is a related bug in <TT
CLASS="COMMAND"
>SET
SESSION AUTHORIZATION</TT
> that allows unprivileged users to crash the server,
if it has been compiled with Asserts enabled (which is not the default).
Thanks to Akio Ishida for reporting this problem.</P
></LI
><LI
><P
>Fix