Organizations have been warned about denial of service (DoS) vulnerabilities found in RabbitMQ, EMQ X and VerneMQ, three widely used open source message brokers.
Message brokers enable applications, systems and services to communicate with each other and exchange information by translating messages between formal messaging protocols. One of the protocols they use is Message Queuing Telemetry Transport (MQTT).
A researcher at the Synopsys Cybersecurity Research Center discovered that specially crafted MQTT messages can cause excessive memory consumption in RabbitMQ (owned by VMware), EMQ X and VerneMQ, leading to the operating system terminating the application.
A type of malformed message that causes a DoS condition has been identified for each of the three message brokers, but there does not appear to be a single message that impacts all three brokers.
“Message brokers can be the nerve center of a complex system,” Jonathan Knudsen, the researcher who discovered the flaws, told SecurityWeek. “If the message broker isn't working, then the various components of the system cannot communicate. Whatever services are provided by that system are unavailable until the message broker is restored.”
As for how the vulnerabilities can be exploited, Knudsen explained, “These vulnerabilities can be exploited by any system that has access to the message broker. The broker can be configured to require authentication or refuse connections from unrecognized endpoints which would limit external attacks. But for an attacker with access to one of the vulnerable message brokers, the vulnerabilities can be exploited simply by delivering a badly formed network packet, which can be done with a very simple script.”
According to EMQ, its message brok ..
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