CVE-2021-32792 : Vulnerability Insights and Analysis

A Cross-Site Scripting (XSS) vulnerability exists in mod_auth_openidc, Apache 2.x HTTP server's authentication module. This vulnerability occurs when using OIDCPreservePost On.

Understanding CVE-2021-32792

This section will cover the details of CVE-2021-32792, its impact, technical description, affected systems, exploitation mechanism, mitigation, and prevention methods.

What is CVE-2021-32792?

CVE-2021-32792 is an XSS vulnerability in mod_auth_openidc before version 2.4.9 when using

OIDCPreservePost On

. This module functions as an OpenID Connect Relying Party for user authentication.

The Impact of CVE-2021-32792

The impact of this vulnerability is rated as low, with a CVSS base score of 3.1. It allows an attacker to execute malicious scripts in the context of a trusted user's session, potentially leading to unauthorized actions.

Technical Details of CVE-2021-32792

The following section dives into the technical aspects of the CVE, including vulnerability description, affected systems and versions, and the exploitation mechanism.

Vulnerability Description

The vulnerability arises in mod_auth_openidc's handling of OIDC requests, enabling malicious scripts to be injected and executed.

Affected Systems and Versions

The XSS vulnerability impacts mod_auth_openidc versions prior to 2.4.9, specifically affecting zmartzone as the vendor.

Exploitation Mechanism

Exploiting this vulnerability involves injecting crafted scripts via OIDC requests to execute unauthorized actions.

Mitigation and Prevention

This section outlines steps to mitigate the risk posed by CVE-2021-32792 and prevent potential exploitation.

Immediate Steps to Take

Users are advised to update mod_auth_openidc to version 2.4.9 or later to remediate the XSS vulnerability.

Long-Term Security Practices

Implement input validation mechanisms, security headers, and content security policies to reduce the risk of XSS attacks.

Patching and Updates

Regularly check for security updates and apply patches promptly to address known vulnerabilities in mod_auth_openidc.