CVE-2021-32702 : Vulnerability Insights and Analysis

The Auth0 Next.js SDK versions prior to

1.4.2

are vulnerable to reflected cross-site scripting (XSS) through the error query parameter in the callback handler.

Understanding CVE-2021-32702

This CVE highlights a security issue in the Auth0 Next.js SDK that can allow attackers to execute arbitrary code through XSS attacks.

What is CVE-2021-32702?

The Auth0 Next.js SDK, specifically versions before and including

1.4.1

, is susceptible to reflected XSS. This vulnerability arises when an attacker injects a malicious XSS payload via the

error

query parameter, which is then processed as an error message by the callback handler. Users of

@auth0/nextjs-auth0

version

1.4.1

or lower are at risk of exploitation unless custom error handling that prevents the return of error messages in HTML responses is implemented.

The Impact of CVE-2021-32702

The impact of this vulnerability is rated as 'HIGH', with a CVSS base score of 8.0. It can lead to severe confidentiality, integrity, and availability issues as attackers can leverage this XSS flaw to execute arbitrary code on the affected systems.

Technical Details of CVE-2021-32702

This section delves into the specific technical aspects of the CVE.

Vulnerability Description

The vulnerability in the Auth0 Next.js SDK allows for reflected XSS through the

error

query parameter, enabling attackers to execute arbitrary code.

Affected Systems and Versions

Systems using the Auth0 Next.js SDK version

1.4.1

or lower are impacted by this vulnerability.

Exploitation Mechanism

Attackers can exploit this vulnerability by injecting a malicious XSS payload in the

error

query parameter processed by the callback handler.

Mitigation and Prevention

It is crucial to take immediate action to mitigate the risks posed by CVE-2021-32702.

Immediate Steps to Take

Upgrade the Auth0 Next.js SDK to version

1.4.2

or higher to address this vulnerability.

Long-Term Security Practices

Regularly monitor for security advisories and updates from Auth0.
Implement secure coding practices to prevent XSS vulnerabilities.

Patching and Updates

Apply patches and updates promptly to ensure the security of your Next.js applications using the Auth0 SDK.