A sudo security update has been released for Debian GNU/Linux 10 LTS to address a flaw where a local user can edit a file not permitted by the security policy, resulting in privilege escalation.

DLA 3272-1: sudo security update

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Debian LTS Advisory DLA-3272-1 debian-lts@lists.debian.org
  https://www.debian.org/lts/security/ Thorsten Alteholz
January 18, 2023   https://wiki.debian.org/LTS
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Package : sudo
Version : 1.8.27-1+deb10u5
CVE ID : CVE-2023-22809

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