CVE-2021-46878 : Security Advisory and Response

This CVE record pertains to an issue discovered in Treasure Data Fluent Bit 1.7.1 that can lead to a type confusion bug, resulting in use-after-free.

Understanding CVE-2021-46878

What is CVE-2021-46878?

CVE-2021-46878 is a vulnerability in Treasure Data Fluent Bit 1.7.1 due to erroneous parsing, leading to a type confusion bug that can be exploited for arbitrary code execution.

The Impact of CVE-2021-46878

The vulnerability can allow an attacker to execute arbitrary code on a target system by crafting a malicious file.

Technical Details of CVE-2021-46878

Vulnerability Description

The issue arises from erroneous parsing in flb_pack_msgpack_to_json_format, causing a type confusion bug that can be exploited for use-after-free.

Affected Systems and Versions

Vendor: n/a
Product: n/a
Versions: All systems running Treasure Data Fluent Bit 1.7.1 are affected.

Exploitation Mechanism

The vulnerability can be exploited by tricking a victim into opening a specially crafted file, leading to use-after-free and code execution.

Mitigation and Prevention

Immediate Steps to Take

Update the affected software to the latest patched version.
Avoid opening files from untrusted sources.
Implement security protocols to detect and mitigate code execution attempts.

Long-Term Security Practices

Regularly update and patch all software and systems.
Conduct security audits to identify and remediate vulnerabilities.

Patching and Updates

It is crucial to promptly apply patches provided by the software vendor to remediate the vulnerability.