A salt security update has been released for Debian GNU/Linux 9 LTS.

DLA 2823-1: salt security update

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Debian LTS Advisory DLA-2823-1 debian-lts@lists.debian.org
  https://www.debian.org/lts/security/ Markus Koschany
November 19, 2021   https://wiki.debian.org/LTS
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Package : salt
Version : 2016.11.2+ds-1+deb9u8
CVE ID : CVE-2021-21996
Debian Bug : 994016

Jonathan Schlue discovered a vulnerability in Salt, a powerful remote execution
manager. A user who has control of the source, and source_hash URLs can gain
full file system access as root on a salt minion.

For Debian 9 stretch, this problem has been fixed in version
2016.11.2+ds-1+deb9u8.

We recommend that you upgrade your salt packages.

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

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