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- ------------------------------------------------------------------------- Debian Security Advisory DSA-5511-1
security@debian.org https://www.debian.org/security/ Markus Koschany October 01, 2023
https://www.debian.org/security/faq
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Package : mosquitto
CVE ID : CVE-2021-34434 CVE-2023-0809 CVE-2023-3592 CVE-2023-28366
CVE-2021-41039
Debian Bug : 993400 1001028
Several security vulnerabilities have been discovered in mosquitto, a MQTT compatible message broker, which may be abused for a denial of service attack.
CVE-2021-34434
In Eclipse Mosquitto when using the dynamic security plugin, if the ability
for a client to make subscriptions on a topic is revoked when a durable
client is offline, then existing subscriptions for that client are not
revoked.
CVE-2023-0809
Fix excessive memory being allocated based on malicious initial packets
that are not CONNECT packets.
CVE-2023-3592
Fix memory leak when clients send v5 CONNECT packets with a will message
that contains invalid property types.
CVE-2023-28366
The broker in Eclipse Mosquitto has a memory leak that can be abused
remotely when a client sends many QoS 2 messages with duplicate message
IDs, and fails to respond to PUBREC commands. This occurs because of
mishandling of EAGAIN from the libc send function.
Additionally CVE-2021-41039 has been fixed for Debian 11 "Bullseye".
CVE-2021-41039
An MQTT v5 client connecting with a large number of user-property
properties could cause excessive CPU usage, leading to a loss of
performance and possible denial of service.
For the oldstable distribution (bullseye), these problems have been fixed
in version 2.0.11-1+deb11u1.
For the stable distribution (bookworm), these problems have been fixed in version 2.0.11-1.2+deb12u1.
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/
Mailing list:
debian-security-announce@lists.debian.org
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