Updated ghostscript packages are available for Ubuntu Linux 19.10, 19.04, 18.04 LTS, and 16.04 LTS to address the -dSAFER escape in .charkeys security issue

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Ubuntu Security Notice USN-4193-1
November 14, 2019

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

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

- Ubuntu 19.10
- Ubuntu 19.04
- Ubuntu 18.04 LTS
- Ubuntu 16.04 LTS

Summary:

Ghostscript could be made to crash, access files, or run programs if it
opened a specially crafted file.

Software Description:
- ghostscript: PostScript and PDF interpreter

Details:

Paul Manfred and Lukas Schauer discovered that Ghostscript incorrectly
handled certain PostScript files. 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, execute arbitrary code,
or cause a denial of service.

Update instructions:

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

Ubuntu 19.10:
ghostscript 9.27~dfsg+0-0ubuntu3.1
libgs9 9.27~dfsg+0-0ubuntu3.1

Ubuntu 19.04:
ghostscript 9.26~dfsg+0-0ubuntu7.4
libgs9 9.26~dfsg+0-0ubuntu7.4

Ubuntu 18.04 LTS:
ghostscript 9.26~dfsg+0-0ubuntu0.18.04.12
libgs9 9.26~dfsg+0-0ubuntu0.18.04.12

Ubuntu 16.04 LTS:
ghostscript 9.26~dfsg+0-0ubuntu0.16.04.12
libgs9 9.26~dfsg+0-0ubuntu0.16.04.12

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

References:
https://usn.ubuntu.com/4193-1
CVE-2019-14869

Package Information:
https://launchpad.net/ubuntu/+source/ghostscript/9.27~dfsg+0-0ubuntu3.1
https://launchpad.net/ubuntu/+source/ghostscript/9.26~dfsg+0-0ubuntu7.4
https://launchpad.net/ubuntu/+source/ghostscript/9.26~dfsg+0-0ubuntu0.18.04.12
https://launchpad.net/ubuntu/+source/ghostscript/9.26~dfsg+0-0ubuntu0.16.04.12