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CVE-2021-21892 : Vulnerability Insights and Analysis

Discover the critical vulnerability CVE-2021-21892 in Lantronix PremierWave 2050 8.9.0.0R4, enabling remote code execution via a specially crafted HTTP request. Learn about the impact, technical details, and mitigation steps.

A stack-based buffer overflow vulnerability has been identified in the Web Manager FsUnmount functionality of Lantronix PremierWave 2050 8.9.0.0R4 (in QEMU), allowing a specially crafted HTTP request to trigger remote code execution when exploited by an attacker.

Understanding CVE-2021-21892

This section delves into the specifics of CVE-2021-21892, highlighting its impact and technical details.

What is CVE-2021-21892?

The vulnerability lies in the Web Manager FsUnmount functionality of Lantronix PremierWave 2050 8.9.0.0R4 (in QEMU), where a malicious HTTP request can result in remote code execution.

The Impact of CVE-2021-21892

With a CVSS base score of 9.9, this critical vulnerability poses a significant threat due to its high confidentiality, integrity, and availability impact, allowing attackers to exploit the system with low privileges and no user interaction.

Technical Details of CVE-2021-21892

Explore the technical aspects and implications of CVE-2021-21892 in this section.

Vulnerability Description

The flaw stems from a stack-based buffer overflow in Lantronix PremierWave 2050 8.9.0.0R4 (in QEMU), enabling attackers to execute arbitrary code remotely via a specially crafted HTTP request.

Affected Systems and Versions

The vulnerability affects Lantronix PremierWave 2050 8.9.0.0R4 (in QEMU), putting systems operating on this version at risk of remote exploitation.

Exploitation Mechanism

By sending a specifically modified HTTP request, an attacker can exploit the buffer overflow in the Web Manager FsUnmount functionality, leading to unauthorized remote code execution.

Mitigation and Prevention

Learn how to protect your systems from CVE-2021-21892 through immediate actions and long-term security measures.

Immediate Steps to Take

        Update to a patched version of Lantronix PremierWave 2050 to mitigate the vulnerability.
        Employ network security measures to filter out malicious HTTP requests targeting the affected functionality.

Long-Term Security Practices

        Regularly monitor and apply security updates to prevent exploitation of known vulnerabilities.
        Implement network segmentation and access controls to limit the impact of potential attacks.

Patching and Updates

Keep systems up-to-date with the latest patches from Lantronix to address security vulnerabilities and enhance system resilience.

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