[Bug 1810517] Re: re-enable GhostScript in ImageMagick

[Naël]

** Information type changed from Public to Public Security

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Title:
  re-enable GhostScript in ImageMagick

Status in imagemagick package in Ubuntu:
  Confirmed

Bug description:
  This security updated https://usn.ubuntu.com/3785-1/ added the
  following to /etc/ImageMagick-6/policy.xml

  <!-- disable ghostscript format types -->
  <policy domain="coder" rights="none" pattern="PS" />
  <policy domain="coder" rights="none" pattern="EPI" />
  <policy domain="coder" rights="none" pattern="PDF" />
  <policy domain="coder" rights="none" pattern="XPS" />

  This prevents from working with PDF, e.g. `convert file.pdf file.png`.
  It is a very common use case and is a suggested way to convert PDF to
  image on many websites, including ask.ubuntu.com

  I had to remove/comment those lines from /etc/ImageMagick-6/policy.xml
  to allow ImageMagick to work with PDF, otherwise it was:

  $ convert test1.pdf test1.png
  convert-im6.q16: not authorized `test1.pdf' @ error/constitute.c/ReadImage/412.
  convert-im6.q16: no images defined `test1.png' @ error/convert.c/ConvertImageCommand/3258.

  Can you please reenable GhostScript?
  I don't think that it is so insecure that so common use cases must be disabled, people, who do not read usn.ubuntu.com frequently, will not understand the error.

  Also, those security update disabled GhostScript on the fly; what if I
  used it on servers or for daily desktop tasks?

  ProblemType: Bug
  DistroRelease: Ubuntu 18.04
  Package: imagemagick 8:6.9.7.4+dfsg-16ubuntu6.4
  ProcVersionSignature: Ubuntu 4.15.0-43.46-generic 4.15.18
  Uname: Linux 4.15.0-43-generic x86_64
  ApportVersion: 2.20.9-0ubuntu7.5
  Architecture: amd64
  CurrentDesktop: XFCE
  Date: Fri Jan  4 15:43:09 2019
  InstallationDate: Installed on 2018-12-21 (13 days ago)
  InstallationMedia: Xubuntu 18.04.1 LTS "Bionic Beaver" - Release amd64 (20180725)
  SourcePackage: imagemagick
  UpgradeStatus: No upgrade log present (probably fresh install)

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