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CVE-2021-21878 : Security Advisory and Response

Learn about CVE-2021-21878, a medium severity local file inclusion vulnerability in Lantronix PremierWave 2050 8.9.0.0R4. Understand the impact, technical details, affected systems, and mitigation strategies.

A local file inclusion vulnerability has been identified in the Web Manager Applications and FsBrowse functionality of Lantronix PremierWave 2050 8.9.0.0R4. An attacker with high privileges can exploit this vulnerability through specially crafted HTTP requests to trigger local file inclusion.

Understanding CVE-2021-21878

This section provides insights into the impact, technical details, and mitigation strategies related to CVE-2021-21878.

What is CVE-2021-21878?

The CVE-2021-21878 vulnerability involves a local file inclusion issue in Lantronix PremierWave 2050 8.9.0.0R4, allowing an attacker to access files through manipulated HTTP requests.

The Impact of CVE-2021-21878

With a CVSS base score of 4.9 (Medium severity), this vulnerability can lead to high confidentiality impact, exposing sensitive information to unauthorized parties.

Technical Details of CVE-2021-21878

Let's dive into the specifics of this vulnerability, including its description, affected systems, and exploitation mechanism.

Vulnerability Description

The flaw in Lantronix PremierWave 2050 8.9.0.0R4 enables attackers to conduct a local file inclusion attack using authenticated HTTP requests.

Affected Systems and Versions

The vulnerability affects Lantronix PremierWave 2050 8.9.0.0R4 running in QEMU environments.

Exploitation Mechanism

Attackers leverage a series of specially crafted HTTP requests to exploit this vulnerability and gain unauthorized access to files.

Mitigation and Prevention

To safeguard systems from CVE-2021-21878, immediate steps should be taken along with implementing long-term security practices and applying necessary patches and updates.

Immediate Steps to Take

Organizations should restrict network access, monitor and validate incoming HTTP requests, and conduct security assessments to detect any signs of exploitation.

Long-Term Security Practices

Regular security training, maintaining strong access controls, and implementing file integrity monitoring are essential to improve overall security posture.

Patching and Updates

Vendors must release security patches promptly to address this vulnerability and ensure users apply these updates without delay.

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