In the cron package through 3.0pl1-128 on Debian, and through 3.0pl1-128ubuntu2 on Ubuntu, the postinst maintainer script allows for group-crontab-to-root privilege escalation via symlink attacks against unsafe usage of the chown and chmod programs.Referenceshttp://bugs.debian.org/864466http://www.openwall.com/lists/oss-security/2017/06/08/3http://www.securitytracker.com/id/1038651https://lists.debian.org/debian-lts-announce/2019/03/msg00025.htmlhttps://lists.debian.org/debian-lts-announce/2021/10/msg00029.html
