[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]
Message-ID: <CAJ_zFk+YYbsEy0EjPU+sgi3pamZt7jqjBLFS8JOeWjmGM=1a_g@mail.gmail.com>
Date: Wed, 5 Oct 2016 09:54:07 -0700
From: Tavis Ormandy <taviso@...gle.com>
To: oss-security@...ts.openwall.com
Subject: Re: CVE Request - multiple ghostscript -dSAFER sandbox problems
On Wed, Oct 5, 2016 at 9:47 AM, Hanno Böck <hanno@...eck.de> wrote:
> On Wed, 5 Oct 2016 09:13:03 -0700
> Tavis Ormandy <taviso@...gle.com> wrote:
>
>> If you're using ImageMagick, I would recommend disabling the PS, EPS,
>> PDF and XPS coders in policy.xml. Applications like gimp, evince,
>> claws, and most other applications that generate thumbnails of PDF/PS
>> documents should probably not do so without a prompt (NOTE: A lot of
>> packages do this
>
> I was surprised to see evince in this list. It uses poppler for pdf and
> libspectre for postscript, so there seems to be no use of
> ghostscript (maybe in an older version).
> Also for claws the only use of ghostscript is in a plugin that's not
> enabled by default.
It might be an old version but the version I have on RHEL7 and Ubuntu
LTS both invoke gs by default.
$ evince --version
GNOME Document Viewer 3.14.2
> While I agree that avoiding parsing for things like thumbnails should
> be tried I still wonder what the overall solution to this is. Because
> even if we avoid non-prompted ps parsing we still want to be able to
> parse PS files without code execution.
> Do you feel dSAFER could be secured or is this a loosing battle?
>
As I understand it, there are also complicated licensing issues with
ghostscript that are going to impede progress.
The problem is a big mess.
> --
> Hanno Böck
> https://hboeck.de/
>
> mail/jabber: hanno@...eck.de
> GPG: FE73757FA60E4E21B937579FA5880072BBB51E42
Powered by blists - more mailing lists
Please check out the
Open Source Software Security Wiki, which is counterpart to this
mailing list.
Confused about mailing lists and their use?
Read about mailing lists on Wikipedia
and check out these
guidelines on proper formatting of your messages.
