CVE-2021-21890 : What You Need to Know

A stack-based buffer overflow vulnerability exists in the Web Manager FsBrowseClean functionality of Lantronix PremierWave 2050 8.9.0.0R4 (in QEMU). This vulnerability could potentially allow remote code execution by sending a specially crafted HTTP request.

Understanding CVE-2021-21890

This section delves into the specifics of CVE-2021-21890, including its impact on affected systems and the technical details of the vulnerability.

What is CVE-2021-21890?

The CVE-2021-21890 vulnerability is a stack-based buffer overflow in Lantronix's PremierWave 2050 8.9.0.0R4 (in QEMU). An attacker could exploit this flaw by sending a manipulated HTTP request, resulting in a potential remote code execution.

The Impact of CVE-2021-21890

With a CVSS base score of 9.1 (Critical), this vulnerability poses a high risk to confidentiality, integrity, and availability. Attackers with high privileges can exploit this issue without user interaction, leading to severe consequences.

Technical Details of CVE-2021-21890

Explore more technical aspects related to the CVE-2021-21890 vulnerability, such as its description, affected systems, and exploitation mechanisms.

Vulnerability Description

The vulnerability originates from a stack-based buffer overflow in the Web Manager FsBrowseClean function of Lantronix PremierWave 2050 8.9.0.0R4 (in QEMU). Triggering the flaw through a crafted HTTP request allows an authenticated attacker to execute arbitrary code remotely.

Affected Systems and Versions

Lantronix PremierWave 2050 8.9.0.0R4 (in QEMU) is specifically impacted by this vulnerability. Systems with this version are at risk of exploitation through specially designed HTTP requests.

Exploitation Mechanism

By manipulating HTTP requests, an attacker can exploit CVE-2021-21890 to execute arbitrary code remotely within the context of the affected branch (deletedir), highlighting the critical nature of this issue.

Mitigation and Prevention

Learn about the immediate steps to take, long-term security practices, and the importance of patching and updates in safeguarding systems against CVE-2021-21890.

Immediate Steps to Take

Given the critical nature of this vulnerability, organizations should immediately apply relevant patches, restrict network access, and monitor for any unauthorized activities that could exploit this flaw.

Long-Term Security Practices

In the long term, implementing secure coding practices, regular security assessments, and maintaining up-to-date security measures can help prevent similar vulnerabilities from being exploited in the future.

Patching and Updates

Vendors like Lantronix may release patches and updates to address CVE-2021-21890. Organizations are urged to apply these patches promptly to mitigate the risk of exploitation and enhance overall system security.