A flaw was found in ghostscript, versions 9.x before 9.50, in the setsystemparams procedure where it did not properly secure its privileged calls, enabling scripts to bypass `-dSAFER` restrictions. A specially crafted PostScript file could disable security protection and then have access to the file system, or execute arbitrary commands.
https://www.debian.org/security/2019/dsa-4518
https://security.gentoo.org/glsa/202004-03
https://seclists.org/bugtraq/2019/Sep/15
https://lists.debian.org/debian-lts-announce/2019/09/msg00007.html
https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2019-14813
https://access.redhat.com/errata/RHSA-2019:2594
https://access.redhat.com/errata/RHBA-2019:2824
http://lists.opensuse.org/opensuse-security-announce/2019-09/msg00090.html
http://lists.opensuse.org/opensuse-security-announce/2019-09/msg00088.html