SB2019031321 - Denial of service in Fluent Bit

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Main Vulnerability Database SB2019031321

SB2019031321 - Denial of service in Fluent Bit

Published: March 13, 2019 Updated: January 4, 2021

Security Bulletin ID SB2019031321
Severity
Medium
Patch available
YES
Number of vulnerabilities 1
Exploitation vector Remote access
Highest impact Denial of service

Breakdown by Severity

Medium 100%
  • Low
  • Medium
  • High
  • Critical

Description

This security bulletin contains information about 1 security vulnerability.


1) Input validation error (CVE-ID: CVE-2019-9749)

The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.

The vulnerability exists due to insufficient validation of user-supplied input in the MQTT input plugin in Fluent Bit. 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.


Remediation

Install update from vendor's website.

References