CVE-2020-5300 : What You Need to Know

In Hydra (an OAuth2 Server and OpenID Certified™ OpenID Connect Provider written in Go), before version 1.4.0+oryOS.17, a vulnerability allowed replay of

private_key_jwt

due to a lack of uniqueness check on the

jti

value.

Understanding CVE-2020-5300

This CVE details a security issue in Hydra related to the handling of JWT tokens.

What is CVE-2020-5300?

CVE-2020-5300 is a vulnerability in Hydra that could be exploited to replay

private_key_jwt

tokens, potentially leading to authentication bypass.

The Impact of CVE-2020-5300

The vulnerability has a CVSS base score of 5.8, with high confidentiality impact and low privileges required for exploitation.

Technical Details of CVE-2020-5300

This section provides more technical insights into the vulnerability.

Vulnerability Description

Hydra did not verify the uniqueness of the

jti

value in JWT tokens, allowing for potential token replay attacks.

Affected Systems and Versions

Product: Hydra
Vendor: Ory
Versions Affected: < 1.4.0+oryOS.17

Exploitation Mechanism

Difficulty in exploiting due to TLS protection against MITM attacks
Limited window of opportunity for replay due to JWT expiry time

Mitigation and Prevention

Protecting systems from this vulnerability requires specific actions.

Immediate Steps to Take

Update Hydra to version v1.4.0+oryOS.17 or later
Monitor for any unusual authentication activities

Long-Term Security Practices

Implement regular security audits and code reviews
Educate developers on secure coding practices

Patching and Updates

Regularly apply security patches and updates to Hydra