Re: Is this a security oversight?

From: Ben Tilly <btilly(at)gmail(dot)com>
To: Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>
Cc: pgsql-sql(at)lists(dot)postgresql(dot)org
Subject: Re: Is this a security oversight?
Date: 2021-08-10 18:40:53
Message-ID: CANoac9Xh-Z9Sv3kF2fUm5c3wfGCmB2gZHDphr5ABzV++zPUGOw@mail.gmail.com
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Bizarre, I thought I had tested that by dropping superuser and trying it.
But I must not have.

In that case please modify this to a request to allow casts to be created
by a superuser without having to change the ownership of the objects
involved.

On Tue, Aug 10, 2021 at 11:32 AM Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> wrote:

> Ben Tilly <btilly(at)gmail(dot)com> writes:
> > As a security rule, you cannot create a cast without owning one of the
> > types.
>
> Check.
>
> > The following code successfully creates it, not as postgres and not as a
> > superuser.
>
> Really? When I try that as an ordinary user, I get
>
> ERROR: must be owner of type boolean
> CONTEXT: SQL statement "ALTER TYPE bool OWNER TO current_user"
> PL/pgSQL function inline_code_block line 12 at SQL statement
>
> If there is a way where that actually does work without superuser
> privileges, please send the details to security(at)postgresql(dot)org(dot)
>
> regards, tom lane
>

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