Sympa through 6.2.57b.2 allows a local privilege escalation from the sympa user account to full root access by modifying the sympa.conf configuration file (which is owned by sympa) and parsing it through the setuid sympa_newaliases-wrapper executable.
https://lists.debian.org/debian-lts-announce/2020/11/msg00015.html
https://github.com/sympa-community/sympa/issues/943#issuecomment-704842235
https://github.com/sympa-community/sympa/issues/943#issuecomment-704779420