[USN-4092-1] Ghostscript vulnerability

[Steve Beattie]

==========================================================================
Ubuntu Security Notice USN-4092-1
August 12, 2019

ghostscript vulnerability
==========================================================================

A security issue affects these releases of Ubuntu and its derivatives:

- Ubuntu 19.04
- Ubuntu 18.04 LTS
- Ubuntu 16.04 LTS

Summary:

Ghostscript could be made to access files if it opened a specially
crafted file.

Software Description:
- ghostscript: PostScript and PDF interpreter

Details:

Netanel Fisher discovered that the font handler in Ghostscript did not
properly restrict privileged calls when '-dSAFER' restrictions were in
effect. If a user or automated system were tricked into processing a
specially crafted file, a remote attacker could possibly use this issue to
access arbitrary files.

Update instructions:

The problem can be corrected by updating your system to the following
package versions:

Ubuntu 19.04:
  ghostscript                     9.26~dfsg+0-0ubuntu7.2
  libgs9                          9.26~dfsg+0-0ubuntu7.2

Ubuntu 18.04 LTS:
  ghostscript                     9.26~dfsg+0-0ubuntu0.18.04.10
  libgs9                          9.26~dfsg+0-0ubuntu0.18.04.10

Ubuntu 16.04 LTS:
  ghostscript                     9.26~dfsg+0-0ubuntu0.16.04.10
  libgs9                          9.26~dfsg+0-0ubuntu0.16.04.10

In general, a standard system update will make all the necessary changes.

References:
  https://usn.ubuntu.com/4092-1
  CVE-2019-10216

Package Information:
  https://launchpad.net/ubuntu/+source/ghostscript/9.26~dfsg+0-0ubuntu7.2
  https://launchpad.net/ubuntu/+source/ghostscript/9.26~dfsg+0-0ubuntu0.18.04.10
  https://launchpad.net/ubuntu/+source/ghostscript/9.26~dfsg+0-0ubuntu0.16.04.10

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