CVE-2020-15084 : Exploit Details and Defense Strategies

In express-jwt (NPM package) up to version 5.3.3, a vulnerability exists where the algorithms entry in the configuration is not enforced, potentially leading to an authorization bypass. This CVE affects users of express-jwt without the algorithms configured in the configuration and using libraries like jwks-rsa as the secret. The issue is resolved in version 6.0.0.

Understanding CVE-2020-15084

This CVE pertains to an authorization bypass vulnerability in the express-jwt package.

What is CVE-2020-15084?

CVE-2020-15084 is a security vulnerability in express-jwt that allows for an authorization bypass under specific conditions.

The Impact of CVE-2020-15084

The vulnerability has a CVSS base score of 7.7, indicating a high severity issue with significant impacts on confidentiality and integrity.

Technical Details of CVE-2020-15084

This section provides technical details of the CVE.

Vulnerability Description

The vulnerability in express-jwt allows for an authorization bypass when the algorithms entry is not specified in the configuration.

Affected Systems and Versions

Product: express-jwt
Vendor: auth0
Versions affected: <= 5.3.3

Exploitation Mechanism

The vulnerability can be exploited when using express-jwt without the algorithms configured and utilizing libraries like jwks-rsa as the secret.

Mitigation and Prevention

Protect your systems from CVE-2020-15084 with the following steps.

Immediate Steps to Take

Upgrade to version 6.0.0 of express-jwt to mitigate the vulnerability.
Ensure that algorithms are properly configured in the express-jwt settings.

Long-Term Security Practices

Regularly review and update your dependencies to prevent similar vulnerabilities.
Implement secure coding practices to enhance overall application security.

Patching and Updates

Stay informed about security advisories and promptly apply patches to address known vulnerabilities.