A sympa security update has been released for Debian GNU/Linux 9 LTS to address an issue where an attacker could manipulate the mailing lists, including subscribing e-mails or getting the list of subscribers.

DLA 2499-1: sympa security update

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Debian LTS Advisory DLA-2499-1 debian-lts@lists.debian.org
  https://www.debian.org/lts/security/
December 17, 2020   https://wiki.debian.org/LTS
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Package : sympa
Version : 6.2.16~dfsg-3+deb9u5
CVE ID : CVE-2020-29668
Debian Bug : 976020

Sympa, a modern mailing list manager, grants full SOAP API access by
sending invalid string as the cookie value, if the SOAP endpoint was
enabled. An attacker could manipulate the mailing lists, including
subscribing e-mails or getting the list of subscribers.

For Debian 9 stretch, this problem has been fixed in version
6.2.16~dfsg-3+deb9u5.

We recommend that you upgrade your sympa packages.

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

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