Matthieu Barjole and Victor Cutillas discovered that sudoedit in sudo, a program designed to provide limited super user privileges to specific users, does not properly handle '--' to separate the editor and arguments from files to edit. A local user permitted to edit certain files can take advantage of this flaw to edit a file not permitted by the security policy, resulting in privilege escalation.
More information can be found at: https://www.sudo.ws/security/advisories/sudoedit_any/
For Debian 10 buster, this problem has been fixed in version 1.8.27-1+deb10u5.
We recommend that you upgrade your sudo packages.
For the detailed security status of sudo please refer to its security tracker page at: https://security-tracker.debian.org/tracker/sudo
Further information about Debian LTS security advisories, how to apply these updates to your system and frequently asked questions can be found at: https://wiki.debian.org/LTS