A mailman security update has been released for Debian GNU/Linux 9 to address several vulnerabilities.

DLA 3049-1: mailman security update

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Debian LTS Advisory DLA-3049-1 debian-lts@lists.debian.org
  https://www.debian.org/lts/security/ Sylvain Beucler
June 09, 2022   https://wiki.debian.org/LTS
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Package : mailman
Version : 1:2.1.23-1+deb9u8
CVE ID : CVE-2021-43331 CVE-2021-43332 CVE-2021-44227
Debian Bug : 1000367 1001685

Several vulnerabilities were discovered in Mailman, a web-based
mailing list manager. An attacker could impersonate more privileged
accounts through different vectors.

CVE-2021-43331

A crafted URL to the Cgi/options.py user options page can execute
arbitrary JavaScript for XSS. (Closes: #1000367)

CVE-2021-43332

The CSRF token for the Cgi/admindb.py admindb page contains an
encrypted version of the list admin password. This could
potentially be cracked by a moderator via an offline brute-force
attack.

CVE-2021-44227

A list member or moderator can get a CSRF token and craft an admin
request (using that token) to set a new admin password or make
other changes.

For Debian 9 stretch, these problems have been fixed in version
1:2.1.23-1+deb9u8.

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