[USN-3866-3] Ghostscript regression

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==========================================================================
Ubuntu Security Notice USN-3866-3
February 26, 2019

ghostscript regression
==========================================================================

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

- Ubuntu 18.10
- Ubuntu 18.04 LTS
- Ubuntu 16.04 LTS
- Ubuntu 14.04 LTS

Summary:

USN-3866-2 introduced a regression in Ghostscript.

Software Description:
- ghostscript: PostScript and PDF interpreter

Details:

USN-3866-2 fixed a regression in Ghostscript. The Ghostscript update
introduced a new regression that resulted in certain pages being printed
with a blue background. This update fixes the problem.

Original advisory details:

Tavis Ormandy 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 18.10:
ghostscript 9.26~dfsg+0-0ubuntu0.18.10.7
libgs9 9.26~dfsg+0-0ubuntu0.18.10.7

Ubuntu 18.04 LTS:
ghostscript 9.26~dfsg+0-0ubuntu0.18.04.7
libgs9 9.26~dfsg+0-0ubuntu0.18.04.7

Ubuntu 16.04 LTS:
ghostscript 9.26~dfsg+0-0ubuntu0.16.04.7
libgs9 9.26~dfsg+0-0ubuntu0.16.04.7

Ubuntu 14.04 LTS:
ghostscript 9.26~dfsg+0-0ubuntu0.14.04.7
libgs9 9.26~dfsg+0-0ubuntu0.14.04.7

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

References:
https://usn.ubuntu.com/usn/usn-3866-3
https://usn.ubuntu.com/usn/usn-3866-1
https://launchpad.net/bugs/1817308

Package Information:
https://launchpad.net/ubuntu/+source/ghostscript/9.26~dfsg+0-0ubuntu0.18.10.7
https://launchpad.net/ubuntu/+source/ghostscript/9.26~dfsg+0-0ubuntu0.18.04.7
https://launchpad.net/ubuntu/+source/ghostscript/9.26~dfsg+0-0ubuntu0.16.04.7
https://launchpad.net/ubuntu/+source/ghostscript/9.26~dfsg+0-0ubuntu0.14.04.7