Apport through 2.20.7 does not properly handle core dumps from setuid binaries allowing local users to create certain files as root which an attacker could leverage to perform a denial of service via resource exhaustion or possibly gain root privileges. NOTE: this vulnerability exists because of an incomplete fix for CVE-2015-1324.
https://usn.ubuntu.com/usn/usn-3480-1
https://people.canonical.com/~ubuntu-security/cve/?cve=CVE-2017-14177
https://launchpad.net/bugs/1726372
https://bazaar.launchpad.net/~apport-hackers/apport/trunk/revision/3171