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CVE-2024-21637: Reflected Cross-Site Scripting Vulnerability in Authentik OpenID Connect Flows

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Overview

The cybersecurity vulnerability CVE-2024-21637 is a serious threat that pertains to Authentik, an open-source Identity Provider. The vulnerability involves a reflected Cross-Site Scripting (XSS) attack in OpenID Connect flows, which potentially allows an attacker to escalate privileges and compromise the system. Given the widespread adoption of Authentik as an Identity Provider, this vulnerability should not be overlooked and needs immediate attention.

Vulnerability Summary

CVE ID: CVE-2024-21637
Severity: High (7.6 CVSS Score)
Attack Vector: Network
Privileges Required: Low
User Interaction: Required
Impact: Potential system compromise or data leakage

Affected Products

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Product | Affected Versions

Authentik | Prior to 2023.10.6
Authentik | Prior to 2023.8.6

How the Exploit Works

This vulnerability exploits a flaw in Authentik’s handling of JavaScript-URIs in OpenID Connect flows with `response_mode=form_post`. In essence, a user can inject malicious JavaScript code that is then reflected back to the user’s browser by the server. This code could be designed to steal sensitive user data or perform actions on behalf of the user, leading to privilege escalation and potential system compromise.

Conceptual Example Code

Below is a conceptual example of how the vulnerability might be exploited:

POST /oidc/authorize HTTP/1.1
Host: target.example.com
Content-Type: application/x-www-form-urlencoded
response_type=code&client_id=client&state=1234&redirect_uri=javascript:malicious_code_here

In this example, the `redirect_uri` parameter is injected with malicious JavaScript code, which is then reflected back to the user’s browser by the server, leading to potential compromise.

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Disclaimer:

The information and code presented in this article are provided for educational and defensive cybersecurity purposes only. Any conceptual or pseudocode examples are simplified representations intended to raise awareness and promote secure development and system configuration practices.

Do not use this information to attempt unauthorized access or exploit vulnerabilities on systems that you do not own or have explicit permission to test.

Ameeba and its authors do not endorse or condone malicious behavior and are not responsible for misuse of the content. Always follow ethical hacking guidelines, responsible disclosure practices, and local laws.

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