CVE-2021-31274 : Exploit Details and Defense Strategies

This article discusses CVE-2021-31274, a stored XSS vulnerability found in LibreNMS < 21.3.0 version, allowing execution of arbitrary JavaScript code through the API Access page.

Understanding CVE-2021-31274

This section explores the impact and technical details of the identified vulnerability.

What is CVE-2021-31274?

A stored XSS vulnerability in LibreNMS < 21.3.0 API Access page enables the execution of arbitrary JavaScript code due to inadequate sanitization of the $api->description variable.

The Impact of CVE-2021-31274

The vulnerability could allow attackers to inject malicious scripts, leading to unauthorized access, data theft, or complete system compromise.

Technical Details of CVE-2021-31274

This section delves into the specifics of the vulnerability.

Vulnerability Description

Insufficient sanitization of the $api->description variable in LibreNMS < 21.3.0 API Access page allows attackers to inject and execute arbitrary JavaScript code.

Affected Systems and Versions

All LibreNMS versions prior to 21.3.0 are affected by this vulnerability.

Exploitation Mechanism

Attackers can exploit this vulnerability by crafting and submitting malicious inputs via the API Access page, enabling the execution of arbitrary JavaScript code.

Mitigation and Prevention

This section provides guidance on mitigating the risks associated with CVE-2021-31274.

Immediate Steps to Take

Users are advised to update LibreNMS to version 21.3.0 or later to remediate the vulnerability and prevent potential exploitation.

Long-Term Security Practices

Implement strict input validation and sanitization practices to prevent XSS vulnerabilities in web applications. Regularly monitor and update system components to address security issues promptly.

Patching and Updates

Stay informed about security updates from LibreNMS and apply patches promptly to ensure the mitigation of known vulnerabilities.