Network Manager VPNC plugin (aka networkmanager-vpnc) before version 1.2.6 is vulnerable to a privilege escalation attack. A new line character can be used to inject a Password helper parameter into the configuration data passed to VPNC, allowing an attacker to execute arbitrary commands as root.
https://www.exploit-db.com/exploits/45313/
https://www.debian.org/security/2018/dsa-4253
https://security.gentoo.org/glsa/201808-03
https://pulsesecurity.co.nz/advisories/NM-VPNC-Privesc
https://lists.debian.org/debian-lts-announce/2018/07/msg00048.html
https://gitlab.gnome.org/GNOME/NetworkManager-vpnc/commit/07ac18a32b4
https://download.gnome.org/sources/NetworkManager-vpnc/1.2/NetworkManager-vpnc-1.2.6.news