Vulnerability 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.
CVSS Score
HIGH
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Treasuredata | Fluent Bit | <= 1.0.4 |
Related Weaknesses (CWE)
References
- https://github.com/fluent/fluent-bit/issues/1135ExploitThird Party Advisory
- https://github.com/fluent/fluent-bit/issues/1135ExploitThird Party Advisory
FAQ
What is CVE-2019-9749?
CVE-2019-9749 is a vulnerability with a CVSS score of 7.5 (HIGH). 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 pack...
How severe is CVE-2019-9749?
CVE-2019-9749 has been rated HIGH with a CVSS base score of 7.5/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2019-9749?
Check the references section above for vendor advisories and patch information. Affected products include: Treasuredata Fluent Bit.