Date: Tue, 9 Oct 2018 10:11:34 -0700 From: Tavis Ormandy <taviso@...gle.com> To: oss-security@...ts.openwall.com Subject: Re: ghostscript: bypassing executeonly to escape -dSAFER sandbox (CVE-2018-17961) On Tue, Oct 9, 2018 at 9:53 AM Leonid Isaev <leonid.isaev@...a.colorado.edu> wrote: > On Tue, Oct 09, 2018 at 06:58:39AM -0700, Tavis Ormandy wrote: > > Full working exploit that works in the last few versions is attached, > > viewing it in evince, imagemagick, gimp, okular, etc should add a line to > > ~/.bashrc. > > Add zathura to the above list :) > > > p.s. plz can we deprecate untrusted postscript :( > > Which means any postscript file downloaded from the internet... Then how > should > people read arXiv.org, for example? I think we should encourage switching to other document formats that we have a better handle on securing. If you do need untrusted ps, I think treating it the same as shell script file you downloaded from the internet. I mean, technically there's a bash restricted mode and python rexec, but you probably wouldn't run it on random things you just downloaded. gs -dSAFER and bash -r are useful features, but I think ever invoking them automatically without prompts about trust, etc, is just asking for trouble. Tavis.
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