Summary
EFAK through 5.1.0 contains a missing authorization vulnerability in its user management API. An authenticated low-privilege user may be able to create, modify, or delete accounts, including granting administrative roles, when administrator checks are not enforced.
EFAK through 5.1.0 contains a missing authorization vulnerability in its user management API. An authenticated low-privilege user may be able to create, modify, or delete accounts, including granting administrative roles, when administrator checks are not enforced.
Affected context
The issue occurs in EFAK deployments where the /api/users endpoints are reachable by authenticated users but do not consistently verify administrator privileges. It affects account-management operations handled by UserController, including user creation, modification, and deletion, and becomes risky when low-privilege accounts can invoke those operations.
The issue occurs in EFAK deployments where the /api/users endpoints are reachable by authenticated users but do not consistently verify administrator privileges. It affects account-management operations handled by UserController, including user creation, modification, and deletion, and becomes risky when low-privilege accounts can invoke those operations.
Exploit preconditions
- Attack surface: EFAK's authenticated
/api/usersaccount-management endpoints - Required access: A valid authenticated account with low privileges
- Trigger point: User creation, update, or deletion requests processed by
UserController - Authorization condition: The request is accepted without confirming that the caller has an administrator role
- Why exploitation is possible: Missing server-side role checks allow unauthorized account and privilege changes
- Attack surface: EFAK's authenticated
/api/usersaccount-management endpoints - Required access: A valid authenticated account with low privileges
- Trigger point: User creation, update, or deletion requests processed by
UserController - Authorization condition: The request is accepted without confirming that the caller has an administrator role
- Why exploitation is possible: Missing server-side role checks allow unauthorized account and privilege changes
Why this happens
The underlying bug is an authorization enforcement failure. The application exposes sensitive user-management operations but does not consistently perform a server-side administrator-role check before executing them. This behavior maps to CWE-862, Missing Authorization, because authentication establishes the caller's identity while access-control decisions for privileged actions are omitted or insufficiently enforced.
The underlying bug is an authorization enforcement failure. The application exposes sensitive user-management operations but does not consistently perform a server-side administrator-role check before executing them. This behavior maps to CWE-862, Missing Authorization, because authentication establishes the caller's identity while access-control decisions for privileged actions are omitted or insufficiently enforced.
Potential impact
- An authenticated user may gain administrative privileges
- Attackers could create additional administrator accounts
- Existing user accounts may be modified or deleted
- Unauthorized users could gain control over managed Kafka cluster operations
- Account integrity and administrative auditability may be reduced
- An authenticated user may gain administrative privileges
- Attackers could create additional administrator accounts
- Existing user accounts may be modified or deleted
- Unauthorized users could gain control over managed Kafka cluster operations
- Account integrity and administrative auditability may be reduced
General mitigation guidance
Mitigation generally focuses on enforcing authorization at every privileged
account-management operation, rather than relying on authentication alone.
Common defensive patterns include:
- Require an explicit administrator or equivalent privileged role for all user-management actions
- Enforce authorization checks on the server for every request method and endpoint
- Apply deny-by-default access policies to administrative APIs
- Prevent clients from selecting or changing privileged roles without an independently authorized workflow
- Use least-privilege service and user accounts
- Record and review account, role, and deletion changes
- Centralize authorization policy enforcement to reduce inconsistent controller behavior
Mitigation generally focuses on enforcing authorization at every privileged
account-management operation, rather than relying on authentication alone.
Common defensive patterns include:
- Require an explicit administrator or equivalent privileged role for all user-management actions
- Enforce authorization checks on the server for every request method and endpoint
- Apply deny-by-default access policies to administrative APIs
- Prevent clients from selecting or changing privileged roles without an independently authorized workflow
- Use least-privilege service and user accounts
- Record and review account, role, and deletion changes
- Centralize authorization policy enforcement to reduce inconsistent controller behavior
How teams detect issues like this
Organizations can look for this weakness through:
- Static analysis rules that identify sensitive controllers without authorization annotations or policy checks
- Code review of every user-management route and HTTP method
- Tests confirming low-privilege accounts cannot create, modify, delete, or elevate users
- API gateway or policy-engine rules restricting account-management endpoints to administrators
- Audit-log monitoring for unexpected role changes, administrator creation, and user deletion
- Automated security testing that evaluates authorization separately from authentication
Organizations can look for this weakness through:
- Static analysis rules that identify sensitive controllers without authorization annotations or policy checks
- Code review of every user-management route and HTTP method
- Tests confirming low-privilege accounts cannot create, modify, delete, or elevate users
- API gateway or policy-engine rules restricting account-management endpoints to administrators
- Audit-log monitoring for unexpected role changes, administrator creation, and user deletion
- Automated security testing that evaluates authorization separately from authentication
