In Artifex Ghostscript before 9.24, gssetresolution and gsgetresolution allow attackers to have an unspecified impact.
https://www.debian.org/security/2018/dsa-4288
https://usn.ubuntu.com/3768-1/
https://security.gentoo.org/glsa/201811-12
https://lists.debian.org/debian-lts-announce/2018/09/msg00038.html
https://bugs.ghostscript.com/show_bug.cgi?id=699670
http://git.ghostscript.com/?p=ghostpdl.git%3Ba=commit%3Bh=5b5536fa88a9e885032bc0df3852c3439399a5c0