Date: Tue, 8 Oct 2002 16:37:59 -0400 From: The Anarcat <anarcat@anarcat.ath.cx> To: Fernando Schapachnik <fschapachnik@vianetworks.com.ar> Cc: FreeBSD Security Issues <FreeBSD-security@FreeBSD.ORG> Subject: Re: access() is a security hole? Message-ID: <20021008203759.GD309@lenny.anarcat.ath.cx> In-Reply-To: <20021008154204.D56601@ns1.via-net-works.net.ar> References: <20021008183227.GC309@lenny.anarcat.ath.cx> <20021008154204.D56601@ns1.via-net-works.net.ar>
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On Tue Oct 08, 2002 at 03:42:04PM -0300, Fernando Schapachnik wrote:
> En un mensaje anterior, The Anarcat escribió:
> > The access(2) manpage mentions an obscure security hole in
> > access(2). How so?
> >
> > "
> > CAVEAT
> > Access() is a potential security hole and should never be used.
>
> It might have to do with the fact that file permissions can change
> between the access() call and the open() call. The preferred way is
> to use fstat() that takes an open fd.
Just what I thought. The man page should be more precise. The way I
read it, there is a security bug in access(2) which is not the
case.
I'll try to come up with an update to the manpage.
A.
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