Debian 11 inetutils Auth Bypass Vulnerability Allows Remote Shell Access

As described also in the GNU InetUtils security advisory, it is not
recommended to run telnetd server at all. At a minimum, restrict network
access to the telnet port to trusted clients only. There is after all no
encryption built into the telnet protocol, so authentication details would
be sent in plain text over the network (which thus needs to be trusted).

For more details see the GNU InetUtils Security Advisory:
https://lists.gnu.org/archive/html/bug-inetutils/2026-01/msg00004.html

For Debian 11 bullseye, this problem has been fixed in version
2:2.0-1+deb11u3.

We recommend that you upgrade your inetutils packages.

For the detailed security status of inetutils please refer to
its security tracker page at:
https://security-tracker.debian.org/tracker/source-package/inetutils

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