1. Introduction
The Cloudera Manager Default Credentials vulnerability involves a web application using default administrator account passwords. This allows attackers remote access to sensitive data and system controls. It primarily affects systems running Cloudera Manager, potentially impacting confidentiality, integrity, and availability of the managed cluster.
2. Technical Explanation
- Root cause: The Cloudera Manager web application uses a hardcoded default password for the administrator account.
- Exploit mechanism: An attacker attempts to log in to the Cloudera Manager web interface using the username ‘admin’ and the default password. If successful, they gain administrative access.
- Scope: This affects all installations of Cloudera Manager where the default password has not been changed.
3. Detection and Assessment
You can confirm if a system is vulnerable by checking the current administrator password or attempting to log in with default credentials.
- Quick checks: Access the Cloudera Manager web interface and attempt to login using username ‘admin’ and password ‘admin’.
- Scanning: Nessus plugin ID 16879 can detect this vulnerability, but results should be verified manually.
- Logs and evidence: Check Cloudera Manager logs for successful logins with the ‘admin’ user. Log locations vary based on configuration.
# No command available to directly check password without attempting login.4. Solution / Remediation Steps
The solution is to log in and change the default password for the ‘admin’ user account.
4.1 Preparation
- Dependencies: Ensure you have access credentials to log in to the Cloudera Manager web interface. Rollback can be achieved by restoring from the pre-change snapshot if necessary.
- Change window: A short maintenance window may be required, depending on cluster activity.
4.2 Implementation
- Step 1: Log in to the Cloudera Manager web interface using the default credentials (admin/admin).
- Step 2: Navigate to the ‘Admin’ menu and select ‘Users’.
- Step 3: Find the ‘admin’ user account.
- Step 4: Click on the ‘admin’ username to edit the account details.
- Step 5: Change the password for the ‘admin’ user to a strong, unique password.
- Step 6: Save the changes.
4.3 Config or Code Example
Before
# No config file example available as password is changed via UI. Default username 'admin' with default password.After
# No config file example available as password is changed via UI. Username 'admin' with a strong, unique password.4.4 Security Practices Relevant to This Vulnerability
Several security practices can help prevent this type of issue.
- Practice 1: Safe defaults – avoid shipping products with default credentials.
- Practice 2: Least privilege – limit the permissions granted to default accounts.
4.5 Automation (Optional)
No automation is recommended for this vulnerability due to security concerns around storing or transmitting passwords in scripts.
# No script provided due to password handling risks.5. Verification / Validation
- Post-fix check: Attempt to login using username ‘admin’ and the *old* password (‘admin’). The login should fail.
- Re-test: Repeat step 1 from section 3, which should now also fail.
- Smoke test: Log in with the new administrator credentials and verify access to key cluster management functions.
- Monitoring: Monitor Cloudera Manager logs for failed login attempts using the ‘admin’ user.
# No command available, verification is done via UI login attempt failure.6. Preventive Measures and Monitoring
Regular security audits and policy enforcement can help prevent this vulnerability.
- Baselines: Update your security baseline to include a requirement for changing default credentials on all new systems.
- Asset and patch process: Review configuration settings during regular asset audits to identify any instances of default credentials being used.
7. Risks, Side Effects, and Roll Back
Changing the password may temporarily disrupt access if the new password is forgotten or lost.
- Risk or side effect 1: Loss of administrator access if the new password is not documented securely.
- Roll back: Restore from the pre-change snapshot taken in section 4.1.
8. References and Resources
Links to official documentation regarding Cloudera Manager security best practices.
- Vendor advisory or bulletin: Cloudera Security Documentation
- NVD or CVE entry: No specific CVE associated with this issue.
- Product or platform documentation relevant to the fix: Cloudera Manager User Management