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Executive Summary
This report presents an in-depth examination of vulnerabilities CVE-2024-50608 and CVE-2024-50609 found in Fluent Bit, version 3.1.9. These vulnerabilities are of significant concern due to their potential to cause Denial of Service (DoS) via null pointer dereference, impacting enterprises globally. The vulnerabilities affect critical plugins within Fluent Bit, notably the Prometheus Remote Write and Open Telemetry plugins, each scoring 8.9 on the CVSS scale. While no active exploitation has been reported, the potential for disruption in log processing environments calls for immediate attention and action.
Technical Information
The vulnerabilities CVE-2024-50608 and CVE-2024-50609 have been identified within the log processor and forwarder, Fluent Bit, specifically version 3.1.9. Fluent Bit is integral to many enterprise data pipelines, given its ability to efficiently manage log data across distributed systems. These issues target the Prometheus Remote Write input plugin and the Open Telemetry Plugin, crucial components in data handling and monitoring.
A Denial of Service (DoS) condition is triggered by the improper handling of the "Content-Length" HTTP header. An attacker can exploit this by sending a specially crafted packet with a "Content-Length: 0", resulting in a NULL pointer dereference. This vulnerability primarily affects the data pipeline at the Input, Buffer, and Router layers of Fluent Bit, causing potential service disruption.
The root cause of these vulnerabilities is attributed to inadequate validation of the "Content-Length" header, which fails to ensure that memory access is valid, thereby enabling attackers to cause unintentional crashes. A Proof of Concept (POC) demonstrated the feasibility of this attack using tools such as Boofuzz and Burp Suite, which facilitated the crafting and refinement of malicious HTTP POST requests targeting this flaw.
Exploitation in the Wild
Currently, there are no reports of active exploitation of these vulnerabilities in the wild. However, the potential for exploitation exists due to the widespread adoption of Fluent Bit in enterprise environments. Continuous monitoring and vigilance are recommended to detect any emerging threats promptly.
APT Groups using this vulnerability
There is no specific attribution to Advanced Persistent Threat (APT) groups exploiting these vulnerabilities at this time. However, given the nature of the vulnerabilities and their potential impact, organizations should remain alert to any intelligence suggesting targeted attacks.
Affected Product Versions
The affected version of Fluent Bit is 3.1.9. It is crucial for organizations using this version to review their deployments and apply recommended mitigations.
Workaround and Mitigation
To mitigate the risk posed by CVE-2024-50608 and CVE-2024-50609, organizations should implement the following strategies. Immediate application of patches that introduce checks for "Content-Length" values is essential to prevent invalid memory access that could lead to a DoS condition. Regular updates to Fluent Bit should be scheduled to ensure the incorporation of all security patches and enhancements. Additionally, network-level filtering should be used to block malicious packets from reaching vulnerable endpoints, providing an additional layer of defense.
References
For further reading and technical details, please refer to the following resources:
Rescana is here for you
At Rescana, we prioritize your organization's security by providing robust Third Party Risk Management (TPRM) solutions. Our platform is designed to help you assess, monitor, and mitigate risks associated with third-party vulnerabilities, ensuring your supply chain remains resilient against emerging threats. For any questions or further assistance regarding this report or other cybersecurity concerns, please reach out to us at ops@rescana.com.