CVE-2021-42567 : Vulnerability Insights and Analysis

Apereo CAS through 6.4.1 allows XSS via POST requests sent to the REST API endpoints.

Understanding CVE-2021-42567

Apereo CAS through 6.4.1 is vulnerable to cross-site scripting (XSS) attacks when POST requests are made to the REST API endpoints.

What is CVE-2021-42567?

CVE-2021-42567 describes a vulnerability in Apereo CAS versions up to 6.4.1 that enables attackers to perform XSS attacks through POST requests to the REST API endpoints.

The Impact of CVE-2021-42567

This vulnerability allows malicious actors to inject and execute malicious scripts into web pages viewed by other users, potentially leading to account hijacking, data theft, and other security breaches.

Technical Details of CVE-2021-42567

Apereo CAS through version 6.4.1 has the following technical details:

Vulnerability Description

The vulnerability enables XSS attacks through POST requests to the REST API endpoints in Apereo CAS.

Affected Systems and Versions

Product: Apereo CAS
Vendor: n/a
Versions affected: Up to 6.4.1

Exploitation Mechanism

Attackers exploit this vulnerability by sending specially crafted POST requests to the REST API endpoints, allowing them to inject and execute malicious scripts.

Mitigation and Prevention

To mitigate the risks associated with CVE-2021-42567, consider the following:

Immediate Steps to Take

Upgrade Apereo CAS to a version beyond 6.4.1 to patch the vulnerability.
Monitor and filter input to the REST API endpoints to prevent malicious script injection.

Long-Term Security Practices

Conduct regular security audits and testing to identify and address vulnerabilities promptly.
Educate developers and users on secure coding practices and the risks of XSS attacks.

Patching and Updates

Stay informed about security updates and patches released by the Apereo CAS project to address vulnerabilities like CVE-2021-42567.