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The AMQP protocol adapter does not check the scale of the AMQP messages sent from the devices in Eclipse Hono versions 1.3.0 and 1.4.0.
Saturday, November 14, 2020, 7:56 GMT
In particular, a system can send messages that are larger than the max message size indicated during the establishment of the connection by the protocol adapter.
While the AMQP 1.0 protocol expressly forbids a peer from transmitting such messages, this action could be abused by a handmade AMQP 1.0 client to transmit a message of infinite size to the adapter, ultimately forcing the adapter to crash with an out-of-memory exception.
The AMQP adapter’s vertx-proton library fails to deny transfers that surpass the configured max-message-size. This allows an attacker to use several transfers that are each under the configured max-framw-size limit to upload an infinite size message to the AMQP adapter.
The library of vertx-proton assembles the entity transfers into the final in-memory message. The adapter is therefore vulnerable to the misuse of its memory resources, ultimately leading to an OOM exception.