CVE-2021-35479 : Exploit Details and Defense Strategies

Nagios Log Server before 2.1.9 is affected by a Stored XSS vulnerability in the custom column view for the alert history and audit log function. Users could be impacted by this vulnerability by opening a malicious link or visiting a third-party web page.

Understanding CVE-2021-35479

This section provides insights into the nature and impact of the CVE-2021-35479 vulnerability.

What is CVE-2021-35479?

The CVE-2021-35479 vulnerability involves Stored Cross-Site Scripting (XSS) in Nagios Log Server before version 2.1.9, specifically in the custom column view for the alert history and audit log function.

The Impact of CVE-2021-35479

Users who interact with a maliciously crafted link or visit a third-party web page are susceptible to exploitation of this vulnerability, potentially leading to unauthorized code execution or data theft.

Technical Details of CVE-2021-35479

This section delves into the technical aspects of the CVE-2021-35479 vulnerability.

Vulnerability Description

The vulnerability allows attackers to inject and execute malicious scripts within the context of the affected Nagios Log Server, posing a significant security risk to users.

Affected Systems and Versions

Nagios Log Server versions prior to 2.1.9 are impacted by this vulnerability, highlighting the importance of prompt updates and thorough security assessments.

Exploitation Mechanism

By leveraging the custom column view for the alert history and audit log function with a specially crafted 'pp' parameter, threat actors can execute stored XSS attacks to compromise user data and systems.

Mitigation and Prevention

Protective measures and best practices to mitigate the risks associated with CVE-2021-35479 are crucial for ensuring system security.

Immediate Steps to Take

Users are advised to update Nagios Log Server to version 2.1.9 or newer to address the vulnerability and prevent potential exploitation by threat actors.

Long-Term Security Practices

Enforcing strict web security policies, educating users about phishing risks, and implementing content security policies can enhance the overall security posture of systems.

Patching and Updates

Regularly applying security patches, monitoring for emerging threats, and staying informed about the latest vulnerabilities in software applications are essential to maintaining a robust defense against cyber threats.