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Message-ID: <CAJ_zFkJ=n=xriGFHYLG5LdySg_BdLioG_wA1p8NV71_DzvBdPA@mail.gmail.com>
Date: Tue, 9 Oct 2018 15:32:02 -0700
From: Tavis Ormandy <taviso@...gle.com>
To: oss-security@...ts.openwall.com
Cc: Bob Friesenhahn <bfriesen@...ple.dallas.tx.us>
Subject: Re: ghostscript: bypassing executeonly to escape
-dSAFER sandbox (CVE-2018-17961)
On Tue, Oct 9, 2018 at 3:27 PM Perry E. Metzger <perry@...rmont.com> wrote:
> I keep wondering if there isn't a way to fully remove the dangerous
> bits from a postscript interpreter so it can _only_ be used to view
> the document and literally has no file system access compiled in at
> all, so there's no way to touch the fs etc. regardless of what flags
> the interpreter is invoked with.
>
> (I, too, find removing the ability to look at historical postscript
> documents a bit more draconian than I like.)
>
>
I've discussed it with upstream, it's a hard no because they feel it would
make ghostscript non-conforming (i.e. non-conforming with the Adobe
PostScript Language Reference Manual)
We probably have similar thoughts on this, but that is the final word from
upstream.
Tavis.
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