A salt regression update has been released for Debian GNU/Linux 9 LTS to address a regression introduced by the previous update.

DLA 2480-2: salt regression update

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Debian LTS Advisory DLA-2480-2 debian-lts@lists.debian.org
  https://www.debian.org/lts/security/ Sylvain Beucler
January 03, 2022   https://wiki.debian.org/LTS
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Package : salt
Version : 2016.11.2+ds-1+deb9u10
CVE ID : CVE-2020-16846 CVE-2021-3197 CVE-2020-28243
CVE-2021-25282 CVE-2021-25284

Past security updates of Salt, a remote execution manager, introduced
regressions for which follow-up fixes were published:

CVE 2020-16846 regression

'salt-ssh' master key initialization fails

CVE 2021-3197 regression

Valid parameters are discarded for the SSHClient

CVE 2020-28243 follow-up

Prevent argument injection in restartcheck

CVE 2021-25282 regression

pillar_roots.write cannot write to subdirs

CVE 2021-25284 regression

The 'cmd.run' function crashes if passing tuple arg

For Debian 9 stretch, this problem has been fixed in version
2016.11.2+ds-1+deb9u10.

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