It was discovered that RabbitMQ, an implementation of the AMQP protocol, didn't correctly validate MQTT (MQ Telemetry Transport) connection authentication. This allowed anyone to login to an existing user account without having to provide a password.

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Debian Security Advisory DSA-3761-1                   This email address is being protected from spambots. You need JavaScript enabled to view it.
	
https://www.debian.org/security/                       Sebastien Delafond
January 13, 2017                      https://www.debian.org/security/faq
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Package        : rabbitmq-server
CVE ID         : CVE-2016-9877
Debian Bug     : 849849

It was discovered that RabbitMQ, an implementation of the AMQP
protocol, didn't correctly validate MQTT (MQ Telemetry Transport)
connection authentication. This allowed anyone to login to an existing
user account without having to provide a password.

For the stable distribution (jessie), this problem has been fixed in
version 3.3.5-1.1+deb8u1.

For the testing (stretch) and unstable (sid) distributions, this
problem has been fixed in version 3.6.6-1.

We recommend that you upgrade your rabbitmq-server packages.

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/

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