Cloud Vulnerability DB
An open project to list all known cloud vulnerabilities and Cloud Service Provider security issues
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Vulnerability DatabaseCVE-2024-4323
CVE-2024-4323:
Wolfi vulnerability analysis and mitigation
Overview
A critical memory corruption vulnerability (CVE-2024-4323), dubbed 'Linguistic Lumberjack', affects Fluent Bit versions 2.0.7 through 3.0.3. The vulnerability exists in the embedded HTTP server's parsing of trace requests. Fluent Bit is a widely used open-source data collector and processor, with over 3 billion downloads and 10 million daily deployments, utilized by all major cloud providers (Aqua Blog).
Technical details
The vulnerability lies in the improper validation of input names in the /api/v1/traces endpoint. During the parsing of incoming requests, the data types of input names are not properly validated before being parsed and are incorrectly assumed to be valid MSGPACKOBJECTSTRs. By passing non-string values in the 'inputs' array of requests, such as integers, it is possible to trigger various memory corruption issues. The vulnerability has received a CVSS v3.1 base score of 9.8 (Critical) with the vector string AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H (Tenable Research).
Impact
The vulnerability can result in multiple severe impacts including denial of service conditions, information disclosure, or remote code execution. In testing environments, researchers were able to reliably crash the service and retrieve chunks of adjacent memory, which could potentially contain sensitive information. While remote code execution is theoretically possible, its exploitation depends on various environmental factors such as host architecture and operating system (Tenable Research).
Mitigation and workarounds
The primary mitigation is to upgrade to Fluent Bit version 3.0.4, which contains the fix for this vulnerability. The fix properly validates the data types of values in the 'inputs' array sent to the traces endpoint. If upgrading is not immediately possible, it is recommended to review configurations that allow access to Fluent Bit's monitoring API and ensure that only authorized users and services can query it. If unused, the endpoint should be disabled (Tenable Research).
Community reactions
Major cloud providers including Microsoft, Amazon, and Google were notified of this issue via their respective vulnerability disclosure mechanisms on May 15, 2024. The vulnerability has gained significant attention due to Fluent Bit's widespread use in cloud environments and its critical role in logging infrastructure (Tenable Research).
Additional resources
Source: This report was generated using AI
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