CVE-2021-21885 : What You Need to Know

A directory traversal vulnerability exists in the Web Manager FsMove functionality of Lantronix PremierWave 2050 8.9.0.0R4, allowing a specially crafted HTTP request to lead to local file inclusion when exploited by an attacker through an authenticated HTTP request.

Understanding CVE-2021-21885

This section provides detailed insights into the CVE-2021-21885 vulnerability affecting Lantronix PremierWave 2050 8.9.0.0R4.

What is CVE-2021-21885?

The CVE-2021-21885 vulnerability is a directory traversal issue in the Web Manager FsMove functionality of Lantronix PremierWave 2050 8.9.0.0R4, enabling an attacker to achieve local file inclusion with a specially crafted HTTP request.

The Impact of CVE-2021-21885

The impact of CVE-2021-21885 is rated as high, with a CVSS base score of 7.2. This vulnerability can have severe consequences on confidentiality, integrity, and availability when successfully exploited. The attacker needs high privileges to trigger this vulnerability remotely over the network.

Technical Details of CVE-2021-21885

In this section, we delve into the technical aspects of CVE-2021-21885.

Vulnerability Description

The vulnerability involves a directory traversal flaw in the Web Manager FsMove functionality, leading to local file inclusion via a specially crafted HTTP request.

Affected Systems and Versions

The affected product is Lantronix PremierWave 2050 8.9.0.0R4 (in QEMU).

Exploitation Mechanism

An attacker can exploit this vulnerability by sending an authenticated HTTP request to trigger the directory traversal issue in Lantronix PremierWave 2050 8.9.0.0R4.

Mitigation and Prevention

To safeguard systems against CVE-2021-21885, the following mitigation strategies can be implemented.

Immediate Steps to Take

Apply security patches provided by Lantronix promptly to mitigate the vulnerability.
Restrict network access and ensure the principle of least privilege to minimize the attack surface.

Long-Term Security Practices

Regularly update and patch all software and firmware to prevent known vulnerabilities.
Implement network segmentation and access controls to limit the impact of potential attacks.

Patching and Updates

Stay informed about security bulletins and advisories from Lantronix and apply recommended patches and updates as soon as they are available.