A mosquitto security update has been released for Debian GNU/Linux 10 (Buster) to address a denial of service issue
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Debian Security Advisory DSA-4570-1 security@debian.org
https://www.debian.org/security/ Salvatore Bonaccorso
November 17, 2019 https://www.debian.org/security/faq
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Package : mosquitto
CVE ID : CVE-2019-11779
Debian Bug : 940654
A vulnerability was discovered in mosquitto, a MQTT version 3.1/3.1.1
compatible message broker, allowing a malicious MQTT client to cause a
denial of service (stack overflow and daemon crash), by sending a
specially crafted SUBSCRIBE packet containing a topic with a extremely
deep hierarchy.
For the stable distribution (buster), this problem has been fixed in
version 1.5.7-1+deb10u1.
We recommend that you upgrade your mosquitto packages.
For the detailed security status of mosquitto please refer to its
security tracker page at:
https://security-tracker.debian.org/tracker/mosquitto
Further information about Debian Security Advisories, how to apply
these updates to your system and frequently asked questions can be
found at: https://www.debian.org/security/
