A smarty3 security update has been released for Debian GNU/Linux 9 LTS to address an issue where remote users were able to run arbitrary PHP code.

DLA 2995-1: smarty3 security update

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Debian LTS Advisory DLA-2995-1 debian-lts@lists.debian.org
  https://www.debian.org/lts/security/ Markus Koschany
May 05, 2022   https://wiki.debian.org/LTS
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Package : smarty3
Version : 3.1.31+20161214.1.c7d42e4+selfpack1-2+deb9u5
CVE ID : CVE-2021-21408 CVE-2021-29454
Debian Bug : 1010375

Smarty3, a template engine for PHP, allowed template authors to run restricted
static php methods. The same authors could also run arbitrary PHP code by
crafting a malicious math string. If a math string was passed through as user
provided data to the math function, remote users were able to run arbitrary PHP
code as well.

For Debian 9 stretch, these problems have been fixed in version
3.1.31+20161214.1.c7d42e4+selfpack1-2+deb9u5.

We recommend that you upgrade your smarty3 packages.

For the detailed security status of smarty3 please refer to
its security tracker page at:
  https://security-tracker.debian.org/tracker/smarty3

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