CVE-2021-32701 Explained : Impact and Mitigation

ORY Oathkeeper, an Identity & Access Proxy API, is susceptible to a potential bypass of token claim validation when OAuth2 Introspection caching is enabled. Explore the impacts, technical details, and mitigation strategies associated with this CVE.

Understanding CVE-2021-32701

This section delves into the critical details of the CVE-2021-32701 vulnerability in ORY Oathkeeper.

What is CVE-2021-32701?

CVE-2021-32701 is a vulnerability within ORY Oathkeeper's Identity & Access Proxy and Access Control Decision API. It allows a potential bypass of token claim validation when OAuth2 Introspection caching is activated.

The Impact of CVE-2021-32701

The vulnerability poses a high severity risk with a CVSS base score of 7.5 (High). It can lead to incorrect authorization, potentially compromising the confidentiality of sensitive information.

Technical Details of CVE-2021-32701

This section provides insight into the technical aspects of the CVE-2021-32701 vulnerability.

Vulnerability Description

When multiple requests with different scopes are made to the API before the cache expires, the validation may remain valid, allowing access beyond intended scopes.

Affected Systems and Versions

ORY Oathkeeper versions between

v0.38.0-beta.2

and

v0.38.12-beta.1

are impacted by this vulnerability.

Exploitation Mechanism

The issue arises due to inadequate validation of token scopes during OAuth2 Introspection caching, enabling potential unauthorized access.

Mitigation and Prevention

Learn how to secure your systems and protect against CVE-2021-32701.

Immediate Steps to Take

Users are advised to disable caching for the

oauth2_introspection

authenticator or apply the forthcoming patch (

v0.38.12-beta.1

) to mitigate the vulnerability.

Long-Term Security Practices

Implement robust authorization testing procedures and ensure adequate test coverage to prevent similar vulnerabilities.

Patching and Updates

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