Date: Thu, 23 Aug 2018 14:44:40 +0200 From: Leonardo Taccari <iamleot@...il.com> To: oss-security@...ts.openwall.com Subject: Re: Re: More Ghostscript Issues: Should we disable PS coders in policy.xml by default? Hello Mateusz, Mateusz Lenik writes: > [...] > 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" /> > > [...] Please note that this will work *only* when ImageMagick is built with `--without-gslib'. In that case ImageMagick is not linked against gslib and ghostscript is directly invoked via `gs' or similar. If ImageMagick was built `--with-gslib' then no `gs' is invoked and there is no delegation, so the problems described by Tavis can be reproduced with that delegate policy rule as well. It is probably safer to follow the workaround described in: <https://www.kb.cert.org/vuls/id/332928>
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