A mailman security update has been released for Debian GNU/Linux 9 LTS to address a potential remote privilege escalation vulnerability.

DLA 2791-1: mailman security update

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Debian LTS Advisory DLA-2791-1 debian-lts@lists.debian.org
  https://www.debian.org/lts/security/ Chris Lamb
October 23, 2021   https://wiki.debian.org/LTS
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Package : mailman
Version : 1:2.1.23-1+deb9u7
CVE IDs : CVE-2021-42096, CVE-2021-42097

It was discovered that there was a potential remote privilege
escalation vulnerability in the Mailman mailing-list manager.

Some CSRF token values were derived from the admin password, and that
could have been used to conductg a brute-force attack against that
password.

For Debian 9 "Stretch", this problem has been fixed in version
1:2.1.23-1+deb9u7.

We recommend that you upgrade your mailman packages.

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

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