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.
https://lists.debian.org/debian-lts-announce/2021/10/msg00029.html
https://lists.debian.org/debian-lts-announce/2019/03/msg00025.html
http://www.securitytracker.com/id/1038651
http://www.openwall.com/lists/oss-security/2017/06/08/3
http://bugs.debian.org/864466
Source: Mitre, NVD
Published: 2017-06-09
Updated: 2025-04-20
Base Score: 6.9
Vector: CVSS2#AV:L/AC:M/Au:N/C:C/I:C/A:C
Severity: Medium
Base Score: 6.7
Vector: CVSS:3.0/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H
EPSS: 0.00045