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Date: Tue, 9 Oct 2018 22:10:50 +0200
From: Hanno Böck <>
To: Leonid Isaev <>
Subject: Re: ghostscript: bypassing executeonly to escape
 -dSAFER sandbox (CVE-2018-17961)


On Tue, 9 Oct 2018 09:30:06 -0600
Leonid Isaev <> wrote:

> Which means any postscript file downloaded from the internet... Then
> how should people read, for example?

Surprised by this claim I did a quick check on arxiv. I don't see any
papers that are only available as postscript. All papers seem to be
available as PDF, some additionally as PS.

Which also makes sense: Many browsers support direct PDF display. While
PDF is also a complex format with pitfalls I'd still trust the
in-browser PDF readers much more than something like ghostscript.

If there are sites that rely on PS documents they should probably be
encouraged to do a server-side sandboxed auto-conversion of them and
offer PDF also.

Hanno Böck

GPG: FE73757FA60E4E21B937579FA5880072BBB51E42

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