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

DLA 2835-1: rsyslog security update

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Debian LTS Advisory DLA-2835-1 debian-lts@lists.debian.org
  https://www.debian.org/lts/security/ Adrian Bunk
November 30, 2021   https://wiki.debian.org/LTS
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Package : rsyslog
Version : 8.24.0-1+deb9u1
CVE ID : CVE-2019-17041 CVE-2019-17042
Debian Bug : 942065 942067

Two heap overflows were fixed in the rsyslog logging daemon.

CVE-2019-17041

Heap overflow in the AIX message parser.

CVE-2019-17042

Heap overflow in the Cisco log message parser.

For Debian 9 stretch, these problems have been fixed in version
8.24.0-1+deb9u1.

We recommend that you upgrade your rsyslog packages.

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

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