CVE-2021-20293 : Security Advisory and Response

A detailed overview of CVE-2021-20293 which involves a reflected Cross-Site Scripting (XSS) vulnerability in RESTEasy up to version 4.6.0.Final.

Understanding CVE-2021-20293

This section provides insights into the nature of the CVE-2021-20293 vulnerability.

What is CVE-2021-20293?

CVE-2021-20293 is a reflected Cross-Site Scripting (XSS) flaw identified in RESTEasy. It stems from improper handling of URL encoding when using @javax.ws.rs.PathParam without a @Produces MediaType, enabling attackers to execute reflected XSS attacks.

The Impact of CVE-2021-20293

The vulnerability poses a significant threat to data confidentiality and integrity, emphasizing the need for prompt mitigation.

Technical Details of CVE-2021-20293

Delve into the technical specifics surrounding CVE-2021-20293 to better understand the implications of this vulnerability.

Vulnerability Description

The XSS flaw in RESTEasy up to version 4.6.0.Final allows threat actors to conduct reflected XSS attacks by manipulating parameter values.

Affected Systems and Versions

All iterations of RESTEasy preceding version 4.6.0.Final are susceptible to this XSS vulnerability, necessitating immediate action.

Exploitation Mechanism

Attackers exploit the lack of proper URL encoding in @javax.ws.rs.PathParam without @Produces MediaType to execute malicious code and compromise system security.

Mitigation and Prevention

Discover the essential steps to mitigate the risks associated with CVE-2021-20293 and prevent potential exploits.

Immediate Steps to Take

It is crucial to apply security patches promptly, conduct security assessments, and implement secure coding practices to mitigate the threat.

Long-Term Security Practices

Implementing input validation mechanisms, security headers, and regular security audits can bolster the long-term resilience of systems against XSS vulnerabilities.

Patching and Updates

Ensure that systems running RESTEasy are updated to version 4.6.0.Final or later to address the XSS vulnerability and enhance overall security posture.