CVE-2023-36456 Explained : Impact and Mitigation

Authentik lacks Proxy IP headers validation

Understanding CVE-2023-36456

This CVE details a vulnerability in Authentik, an open-source Identity Provider, where versions prior to 2023.4.3 and 2023.5.5 do not verify the source of X-Forwarded-For and X-Real-IP headers.

What is CVE-2023-36456?

Authentik setups directly accessible by users without a reverse proxy are at risk of IP address spoofing, leading to security concerns related to IP address accuracy, user authentication, and application verification protocols.

The Impact of CVE-2023-36456

The vulnerability allows for potential IP address spoofing, compromising user authentication, log reliability, and application security measures that rely on IP address verification.

Technical Details of CVE-2023-36456

Versions 2023.4.3 and 2023.5.5 address this security issue by verifying the source of X-Forwarded-For and X-Real-IP headers.

Vulnerability Description

The vulnerability in Authentik allows for IP address spoofing in logs, user sessions, and downstream applications behind a reverse proxy.

Affected Systems and Versions

Versions prior to 2023.4.3 and 2023.5.5 of Authentik are affected by this vulnerability.

Exploitation Mechanism

This vulnerability can be exploited by directly accessible Authentik setups without a reverse proxy by spoofing IP addresses in headers.

Mitigation and Prevention

Implement the following measures to mitigate the risks associated with CVE-2023-36456:

Immediate Steps to Take

Update Authentik to versions 2023.4.3 or 2023.5.5 to patch the vulnerability and ensure IP headers validation.

Long-Term Security Practices

Regularly update Authentik and follow best security practices to protect against similar vulnerabilities.

Patching and Updates

Stay informed about security updates and apply patches promptly to maintain the security of Authentik.