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Message-ID: <CAJ_zFkKKPfO-w1iBcLMdLF=ZGLQG43jJQRxMYYUwGFm7Wx0WHA@mail.gmail.com>
Date: Wed, 5 Oct 2016 10:09:07 -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 10:04 AM, Tavis Ormandy <taviso@...gle.com> wrote:
> On Wed, Oct 5, 2016 at 9:54 AM, Tavis Ormandy <taviso@...gle.com> wrote:
>> 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
>
> Oops, I think I may be wrong about that, I just saw that some of my
> test cases repro and assumed it was using ghostscript.
>
> Maybe there are poppler issues as well, sigh.
>
Ahh, no, I was right - it's using libgs, and the same issues apply there.
Tavis.
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