Executive Summary

This vulnerability exists in the uds-identity-config component, specifically in the ClientIdAndKubernetesSecretAuthenticator used by UDS Core's Identity deployment. Due to a logic error, the submitted client_secret is overwritten with a mounted Kubernetes secret before comparison, allowing an attacker who can reach the Keycloak token endpoint and knows a client_id to authenticate as that client using any client_secret value.

This flaw enables unauthorized access to OAuth2 tokens scoped to the client's service account, including privileged clients like uds-operator, which can then be used to create, modify, or delete OIDC clients.

The vulnerability affects versions 0.11.0 through 0.26.0 of uds-identity-config and was patched in version 0.26.1.

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Impact Analysis

This vulnerability can have severe impacts as it allows an attacker to bypass client authentication and obtain OAuth2 tokens with the privileges of the targeted client.

• Unauthorized access to sensitive OAuth2 tokens.
• Potential for privilege escalation by using tokens from privileged clients like uds-operator.
• Ability for attackers to create, modify, or delete OIDC clients, leading to further credential theft or unauthorized access.
• High impact on confidentiality, integrity, and availability of the affected systems.

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Detection Guidance

This vulnerability can be detected by reviewing Keycloak event logs for suspicious activity, such as unexpected client operations or unauthorized token requests involving the affected clients.

Specifically, monitoring the Keycloak token endpoint for unusual authentication attempts where any client_secret value is accepted for a known client_id using the vulnerable authenticator can indicate exploitation.

While no specific commands are provided in the resources, administrators should query Keycloak logs for events related to the uds-operator client or other clients using the client-kubernetes-secret authenticator.

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Mitigation Strategies

Immediate mitigation steps include upgrading uds-identity-config to version 0.26.1 or later, which contains the patch for this vulnerability.

For UDS Core deployments, upgrade to patched versions of UDS Core (v1.0.1, v1.1.1, or v1.2.2) that include fixes for this issue.

As a temporary workaround, switch the uds-operator client authentication mechanism from the vulnerable Kubernetes secret authenticator to the Client ID and Secret authenticator.

Additionally, review and apply client policy restrictions to limit the scope of operations that can be performed with tokens obtained via this authenticator.

Finally, monitor Keycloak event logs closely for any suspicious activity to detect potential exploitation attempts.

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Compliance Impact

This vulnerability allows an attacker to bypass client authentication and obtain OAuth2 tokens with high privileges, including the ability to create, modify, or delete OIDC clients. Such unauthorized access and potential privilege escalation can lead to unauthorized disclosure, modification, or disruption of sensitive data and services.

Given the critical impact on confidentiality, integrity, and availability of authentication tokens and client configurations, this vulnerability could negatively affect compliance with standards and regulations like GDPR and HIPAA, which require strict controls over access to sensitive data and systems.

Organizations using affected versions should remediate promptly to maintain compliance by preventing unauthorized access and ensuring proper authentication mechanisms are in place.

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