A vulnerability in OpenOffice's PPT file parser before 4.1.4, and specifically in PPTStyleSheet, allows attackers to craft malicious documents that cause denial of service (memory corruption and application crash) potentially resulting in arbitrary code execution.
https://www.openoffice.org/security/cves/CVE-2017-12607.html
https://www.debian.org/security/2017/dsa-4022
https://lists.debian.org/debian-lts-announce/2017/12/msg00017.html
http://www.securitytracker.com/id/1039734