CVE-2021-21896 Explained : Impact and Mitigation

A directory traversal vulnerability in Lantronix PremierWave 2050 8.9.0.0R4 (in QEMU) allows arbitrary file deletion through a crafted HTTP request.

Understanding CVE-2021-21896

This CVE describes a path traversal vulnerability in Lantronix PremierWave 2050 8.9.0.0R4 (in QEMU) that can be exploited by attackers to delete files.

What is CVE-2021-21896?

The vulnerability exists in the Web Manager FsBrowseClean feature of Lantronix PremierWave 2050 8.9.0.0R4 (in QEMU), enabling attackers to delete files via a malicious HTTP request.

The Impact of CVE-2021-21896

The impact of this vulnerability is rated as medium severity with a CVSS base score of 4.9. Attackers can exploit it to achieve a high availability impact.

Technical Details of CVE-2021-21896

This section covers specific technical information about the vulnerability.

Vulnerability Description

A directory traversal flaw in Lantronix PremierWave 2050 8.9.0.0R4 (in QEMU) allows malicious users to delete files via a specially crafted HTTP request.

Affected Systems and Versions

The impacted system is Lantronix PremierWave 2050 version 8.9.0.0R4 running in QEMU.

Exploitation Mechanism

Attackers can trigger the vulnerability by sending a crafted HTTP request to the Web Manager FsBrowseClean feature.

Mitigation and Prevention

To mitigate the risks associated with CVE-2021-21896, certain steps need to be taken.

Immediate Steps to Take

Users should apply relevant security patches provided by Lantronix to address this vulnerability. Additionally, access to sensitive systems should be restricted.

Long-Term Security Practices

Implementing proper input validation and security controls can help prevent such vulnerabilities. Regular security audits and monitoring are also recommended.

Patching and Updates

It is crucial to regularly update and patch the affected system to ensure protection against known vulnerabilities.