Keycloak is an open-source identity and access management solution, widely used in corporate and developer environments for secure authentication and authorization. Developed and maintained by Red Hat, Keycloak supports OAuth2 and SAML protocols and allows for SSO across multiple applications. It is often deployed on cloud environments and integrated with various backend systems. Security-conscious teams utilize Keycloak to centralize user authentication. Any security flaws in Keycloak can affect the integrity of access controls and sensitive data.
This vulnerability allows attackers to conduct Open Redirect attacks by exploiting improperly validated redirect URIs. When a misconfigured redirect URI is set to 'localhost' or '127.0.0.1', the attacker can redirect users to an arbitrary URL. This may expose sensitive information, including authorization codes, to attackers. Consequently, successful exploitation could lead to unauthorized session access or data leakage.
The vulnerability is present in the 'Valid Redirect URI' configuration within Keycloak. When this URI is set to unsafe values such as 'http://localhost' or 'http://127.0.0.1', it enables redirection to attacker-controlled sites. Attackers exploit this by appending malicious URLs to the redirect URI parameter, capturing sensitive information like authorization codes. Vulnerable endpoints include the '/realms/master/protocol/openid-connect/auth' URL, and the misconfiguration can impact several Keycloak clients, including 'security-admin-console' and 'account-console'. The vulnerability requires user interaction to complete the redirection.
If exploited, this vulnerability could allow attackers to redirect users to phishing sites or other malicious websites, leading to session hijacking or credential theft. Sensitive information, such as authorization codes, may be exposed to attackers, potentially leading to unauthorized access to protected resources. Additionally, exploitation could compromise the integrity of authentication workflows in systems that rely on Keycloak. This may result in unauthorized access to sensitive user data or application resources.
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References:
- Review and limit 'Valid Redirect URIs' to trusted domains only.
- Avoid setting redirect URIs to 'localhost' or internal IPs like '127.0.0.1'.
- Regularly audit application configuration settings and access controls.
- Apply any security patches released by Keycloak for Open Redirect mitigation.
- Implement logging and monitoring for unusual redirect URI requests to detect potential exploitation attempts.
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