A prosody security update has been released for Debian GNU/Linux 9 LTS to address two security issues.

DLA 2687-1: prosody security update

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Debian LTS Advisory DLA-2687-1 debian-lts@lists.debian.org
  https://www.debian.org/lts/security/ Anton Gladky
June 15, 2021   https://wiki.debian.org/LTS
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Package : prosody
Version : 0.9.12-2+deb9u3
CVE ID : CVE-2021-32917 CVE-2021-32921

Two security issues have been discovered in prosody:

CVE-2021-32917

The proxy65 component allows open access by default, even if neither of the
users has an XMPP account on the local server, allowing unrestricted use of
the server's bandwidth.

CVE-2021-32921

Authentication module does not use a constant-time algorithm for comparing
certain secret strings when running under Lua 5.2 or later. This can
potentially be used in a timing attack to reveal the contents of secret
strings to an attacker.

For Debian 9 stretch, these problems have been fixed in version
0.9.12-2+deb9u3.

We recommend that you upgrade your prosody packages.

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

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