Date: Thu, 23 Aug 2018 13:29:23 +0200 From: Mateusz Lenik <mlen@...n.pl> To: oss-security@...ts.openwall.com Subject: Re: Re: More Ghostscript Issues: Should we disable PS coders in policy.xml by default? Hello, On Thu, Aug 23, 2018 at 11:06 AM Leonardo Taccari <iamleot@...il.com> wrote: > Bob Friesenhahn writes: > > The CERT advisory at https://www.kb.cert.org/vuls/id/332928 provides a > > policy.xml example which does not appear to block PS2 and PS3, which > > are also entry points for reading Postscript. > > [...] > > If I am not missing something I think that ghostscript isn't used > for them though. > It seems to be possible to disable GhostScript in ImageMagick completely by the policy rule below. It's not possible to miss any format with it. <policy domain="delegate" rights="none" pattern="gs" /> I also found out that Amit's exploit works with lesspipe that ships with less by default -- it uses gs via ps2ascii wrapper Best, Mateusz
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