From tenable.com
Key takeaways
- Fluent Bit is a logging utility heavily used by all major cloud providers.
- Tenable Research discovered a critical vulnerability dubbed Linguistic Lumberjack (CVE-2024-4323) within Fluent Bit’s built-in HTTP server that could potentially allow for denial of service, information disclosure, or remote code execution.
- The vulnerability was introduced in version 2.0.7 and exists thru 3.0.3. It is fixed in the main source branch and is expected in release 3.0.4.
- The issue can be resolved by …
- … upgrading to the latest version of Fluent Bit.
- … appropriately limiting access to the vulnerable endpoint.
An overview of Fluent Bit and of the Linguistic Lumberjack vulnerability
Fluent Bit is a lightweight, open-source data collector and processor that can handle large volumes of log data from various sources. It was designed to be highly scalable and easy to use, making it an ideal choice for collecting and processing logs in cloud-based environments. The project boasts upwards of 3 billion downloads as of 2022 and continues to see more than 10 million deployments each day. It is used heavily in almost every major cloud provider’s infrastructure.