A shibboleth-sp2 security update has been released for Debian GNU/Linux 9 LTS to address the possibility of phishing attacks.

DLA 2599-1: shibboleth-sp2 security update

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Debian LTS Advisory DLA-2599-1 debian-lts@lists.debian.org
  https://www.debian.org/lts/security/ Utkarsh Gupta
March 19, 2021   https://wiki.debian.org/LTS
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Package : shibboleth-sp2
Version : 2.6.0+dfsg1-4+deb9u2
CVE ID : not yet available
Debian Bug : 985405

Toni Huttunen discovered that the Shibboleth service provider's template
engine used to render error pages could be abused for phishing attacks.

For additional information please refer to the upstream advisory at
  https://shibboleth.net/community/advisories/secadv_20210317.txt

For Debian 9 stretch, this problem has been fixed in version
2.6.0+dfsg1-4+deb9u2.

We recommend that you upgrade your shibboleth-sp2 packages.

For the detailed security status of shibboleth-sp2 please refer to
its security tracker page at:
  https://security-tracker.debian.org/tracker/shibboleth-sp2

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