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Message-ID: <CAJ_zFkLvLBnn8OO6Q3JuqyvpRKoo=63wE1meqsT_jR4USir4DQ@mail.gmail.com> Date: Wed, 5 Sep 2018 11:02:48 -0700 From: Tavis Ormandy <taviso@...gle.com> To: oss-security@...ts.openwall.com Subject: Re: Re: More Ghostscript Issues: Should we disable PS coders in policy.xml by default? Quick update, this <http://git.ghostscript.com/?p=ghostpdl.git&a=commitdiff&h=5812b1b78fc4> commit fixes that problem, but I noticed that fix is incomplete and can be bypassed, so filed another bug for that (the new bug is 699718). $ ./gs -dSAFER bug699718.txt GPL Ghostscript GIT PRERELEASE 9.25 (2018-09-03) Copyright (C) 2018 Artifex Software, Inc. All rights reserved. This software comes with NO WARRANTY: see the file PUBLIC for details. uid=1000(taviso) gid=1000(primarygroup) I would like to re-emphasize that while Ghostscript is very capable and mature software, I consider the -dSAFER sandbox to be a fragile security boundary and that we should consider deprecating (or minimizing the use of) untrusted postscript. Tavis. On Tue, Sep 4, 2018 at 1:08 PM Tavis Ormandy <taviso@...gle.com> wrote: > > > On Tue, Sep 4, 2018 at 1:03 PM Brandon Perry <bperry.volatile@...il.com> > wrote: > >> >> >> > On Sep 4, 2018, at 2:59 PM, Tavis Ormandy <taviso@...gle.com> wrote: >> > >> > OK, well, the fixes missed 9.24 so vendors will have to either ship >> patches >> > once they land or wait for 9.25. >> > >> > $ ./gs -v >> > GPL Ghostscript 9.24 (2018-09-03) >> > Copyright (C) 2018 Artifex Software, Inc. All rights reserved. >> > $ ./gs -q -dSAFER -sDEVICE=ppmraw -f testcase.ps >> > uid=1000(taviso) gid=1000(taviso) >> > >> > Let me know if anyone wants that testcase. >> >> Hey Tavis, could I have a copy of the test case please? Thanks so much. >> > > Sure, here it is. > > Thanks, Tavis. > >
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