Date: Tue, 9 Oct 2018 18:34:23 -0400 From: Alex Gaynor <alex.gaynor@...il.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) Would they consider making a build-time "safe PS only" flag that ensured it was compiled without things like shell-invocation? Then we could just try to convince Linux distros to package it that way :-) Alex On Tue, Oct 9, 2018 at 6:33 PM Tavis Ormandy <taviso@...gle.com> wrote: > 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. > -- All that is necessary for evil to succeed is for good people to do nothing.
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