Ghostscript before 9.21 might allow remote attackers to bypass the SAFER mode protection mechanism and consequently execute arbitrary code by leveraging type confusion in .initialize_dsc_parser.
https://security.gentoo.org/glsa/201702-31
https://bugs.ghostscript.com/show_bug.cgi?id=697190
http://www.securityfocus.com/bid/95337
http://www.openwall.com/lists/oss-security/2016/10/05/15
http://www.debian.org/security/2016/dsa-3691
http://rhn.redhat.com/errata/RHSA-2017-0014.html
http://rhn.redhat.com/errata/RHSA-2017-0013.html
http://git.ghostscript.com/?p=ghostpdl.git%3Bh=875a0095f37626a721c7ff57d606a0f95af03913