Fluent Bit up to 3.0.3 Embedded HTTP Server heap-based overflow

Summaryinfo

A vulnerability categorized as critical has been discovered in Fluent Bit up to 3.0.3. This issue affects some unknown processing of the component Embedded HTTP Server. Such manipulation leads to heap-based overflow. This vulnerability is referenced as CVE-2024-4323. It is possible to launch the attack remotely. No exploit is available. Applying a patch is advised to resolve this issue.

Detailsinfo

A vulnerability was found in Fluent Bit up to 3.0.3 and classified as very critical. Affected by this issue is an unknown functionality of the component Embedded HTTP Server. The manipulation with an unknown input leads to a heap-based overflow vulnerability. Using CWE to declare the problem leads to CWE-122. A heap overflow condition is a buffer overflow, where the buffer that can be overwritten is allocated in the heap portion of memory, generally meaning that the buffer was allocated using a routine such as malloc(). Impacted is confidentiality, integrity, and availability. CVE summarizes:

A memory corruption vulnerability in Fluent Bit versions 2.0.7 thru 3.0.3. This issue lies in the embedded http server’s parsing of trace requests and may result in denial of service conditions, information disclosure, or remote code execution.

The advisory is shared for download at tenable.com. This vulnerability is handled as CVE-2024-4323 since 04/29/2024. The exploitation is known to be easy. The attack may be launched remotely. No form of authentication is required for exploitation. There are neither technical details nor an exploit publicly available. The current price for an exploit might be approx. USD $0-$5k (estimation calculated on 02/11/2025).

The vulnerability scanner Nessus provides a plugin with the ID 215324 (Azure Linux 3.0 Security Update: fluent-bit (CVE-2024-4323)), which helps to determine the existence of the flaw in a target environment.

Applying the patch 9311b43a258352797af40749ab31a63c32acfd04 is able to eliminate this problem. The bugfix is ready for download at github.com.

The vulnerability is also documented in the vulnerability database at Tenable (215324). VulDB is the best source for vulnerability data and more expert information about this specific topic.

Productinfo

Name

• Fluent Bit

Version

• 3.0.0
• 3.0.1
• 3.0.2
• 3.0.3

License

• open-source

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VulDB is the best source for vulnerability data and more expert information about this specific topic.

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