CVE-2021-3277 : Vulnerability Insights and Analysis
Learn about CVE-2021-3277, a critical vulnerability in Nagios XI 5.7.5 allowing remote code execution via arbitrary file uploads. Discover impact, technical details, and mitigation steps.
Nagios XI 5.7.5 and earlier versions are susceptible to a critical vulnerability that allows authenticated administrators to upload arbitrary files, leading to remote code execution by uploading PHP files.
Understanding CVE-2021-3277
This CVE was made public on January 21, 2021.
What is CVE-2021-3277?
CVE-2021-3277 is a security vulnerability in Nagios XI 5.7.5 and prior versions that enables authenticated admins to upload malicious files, potentially resulting in remote code execution through the misuse of the rename functionality in the custom-includes component.
The Impact of CVE-2021-3277
Exploitation of this vulnerability could allow attackers to execute arbitrary PHP code on the affected system, compromising the confidentiality, integrity, and availability of the system and its data.
Technical Details of CVE-2021-3277
This CVE record was issued by MITRE CVE on June 7, 2021.
Vulnerability Description
The flaw arises from inadequate validation of file uploads, specifically in the rename functionality within the custom-includes component of Nagios XI versions 5.7.5 and earlier.
Affected Systems and Versions
Nagios XI versions 5.7.5 and prior are impacted by this vulnerability.
Exploitation Mechanism
By leveraging this vulnerability, authenticated administrators can maliciously upload PHP files, leading to remote code execution within the context of the web server.
Mitigation and Prevention
It is crucial to take immediate action to address CVE-2021-3277 to secure your Nagios XI deployment.
Immediate Steps to Take
- Upgrade Nagios XI to a non-vulnerable version such as the latest release.
- Implement proper file upload validation mechanisms to prevent unauthorized file uploads.
Long-Term Security Practices
Regularly monitor security advisories and update Nagios XI promptly to mitigate potential risks.
Patching and Updates
Stay informed about security best practices and apply patches and updates provided by Nagios Enterprises to safeguard your system against known vulnerabilities.