CVE-2021-36088 : Security Advisory and Response

Fluent Bit (aka fluent-bit) 1.7.0 through 1.7,4 has a double free vulnerability that can be triggered in certain scenarios.

Understanding CVE-2021-36088

This CVE refers to a specific issue in the Fluent Bit software version 1.7.0 through 1.7,4 that can lead to a double free vulnerability, potentially resulting in a security risk.

What is CVE-2021-36088?

The CVE-2021-36088 vulnerability in Fluent Bit involves a double free in flb_free, which is called from flb_parser_json_do and flb_parser_do. This vulnerability could be exploited by attackers to cause a denial of service or potentially execute arbitrary code.

The Impact of CVE-2021-36088

The impact of this vulnerability is significant as it allows attackers to exploit the double free issue to compromise the affected system, leading to a potential denial of service or unauthorized code execution.

Technical Details of CVE-2021-36088

This section will cover the technical details of CVE-2021-36088, including the vulnerability description, affected systems and versions, and the exploitation mechanism.

Vulnerability Description

Fluent Bit versions 1.7.0 through 1.7,4 are affected by a double free vulnerability in flb_free, which can be triggered through specific functions within the software such as flb_parser_json_do and flb_parser_do.

Affected Systems and Versions

The vulnerability affects Fluent Bit versions 1.7.0 through 1.7,4. Users running these versions are advised to take immediate action to mitigate the risk.

Exploitation Mechanism

Attackers can exploit this vulnerability by crafting a malicious payload to trigger the double free condition in the affected functions, potentially leading to a system compromise.

Mitigation and Prevention

To address CVE-2021-36088, users and administrators are recommended to take immediate steps, implement long-term security practices, and apply relevant patches and updates.

Immediate Steps to Take

Immediately update to a patched version of Fluent Bit that addresses the double free vulnerability. Consider implementing network security measures to detect and block potential exploitation attempts.

Long-Term Security Practices

Establish comprehensive security protocols, conduct regular security audits, and stay informed about software vulnerabilities to proactively prevent similar issues in the future.

Patching and Updates

Regularly check for security updates from Fluent Bit and apply patches promptly to ensure the protection of your systems against known vulnerabilities.