CVE-2019-9749 Integer overflow in n/a

High 7.5 Published 13 Mar 2019 Updated 16 Sep 2024

A crafted MQTT packet causes a negative size parameter in memmove, crashing the Fluent Bit server when the MQTT input plugin is active.

Exploited in the wild: Not known
Login needed: Not needed
Attackable: Over the internet
Victim action needed: Not needed
Fix: None listed

What is CVE-2019-9749?

CVE-2019-9749 is a high-severity vulnerability in n/a, published on 13 Mar 2019. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official description

An issue was discovered in the MQTT input plugin in Fluent Bit through 1.0.4. When this plugin acts as an MQTT broker (server), it mishandles incoming network messages. After processing a crafted packet, the plugin's mqtt_packet_drop function (in /plugins/in_mqtt/mqtt_prot.c) executes the memmove() function with a negative size parameter. That leads to a crash of the whole Fluent Bit server via a SIGSEGV signal.

Weakness: CWE-681

Which versions are affected by CVE-2019-9749?

It affects 1 product.

Products include Treasuredata Fluent Bit.

How do I fix CVE-2019-9749?

No fix has been published for CVE-2019-9749 yet. Limit exposure of the affected software until one is available.

Is CVE-2019-9749 being exploited?

There is no known exploitation of CVE-2019-9749 in the wild and no public exploit code.

Sources

Also known as GHSA-8mpq-mw74-r6q5.