CVE-2021-25929 : Exploit Details and Defense Strategies

A stored Cross-Site Scripting vulnerability has been discovered in OpenNMS Horizon and OpenNMS Meridian software, making it possible for authenticated attackers to inject malicious scripts.

Understanding CVE-2021-25929

This CVE details a significant security flaw in OpenNMS software versions that could lead to Cross-Site Scripting attacks.

What is CVE-2021-25929?

OpenNMS Horizon and Meridian software versions are susceptible to stored Cross-Site Scripting due to inadequate validation on the input sent to the

name

parameter in the

noticeWizard

endpoint.

The Impact of CVE-2021-25929

This vulnerability allows authenticated attackers to inject arbitrary scripts, potentially tricking admin users into downloading harmful files.

Technical Details of CVE-2021-25929

This section provides a deeper look into the vulnerability affecting OpenNMS software.

Vulnerability Description

The flaw arises from the lack of validation on the

name

parameter within the

noticeWizard

endpoint, enabling attackers to insert malicious scripts.

Affected Systems and Versions

Versions opennms-1-0-stable through opennms-27.1.0-1 and meridian-foundation-2015.1.0-1 through meridian-foundation-2020.1.6-1 are impacted by this vulnerability.

Exploitation Mechanism

Authenticated attackers exploit the vulnerability by injecting arbitrary script into the

name

parameter, posing a risk to the security of other admin users.

Mitigation and Prevention

To safeguard systems from CVE-2021-25929, it is crucial to take immediate action and implement long-term security practices.

Immediate Steps to Take

Ensure all OpenNMS software is updated to the latest patched versions to mitigate the risk of exploitation.

Long-Term Security Practices

Employ strict input validation mechanisms and conduct regular security audits to prevent similar vulnerabilities in the future.

Patching and Updates

Stay informed about security updates from OpenNMS and promptly apply patches to secure your systems.