1. Introduction
The IBM WebSphere Portal Unspecified Denial of Service vulnerability (PI16462) affects web portal software, potentially causing a successful login attempt to loop indefinitely. This can disrupt service availability for users attempting to access the portal. Systems running affected versions of IBM WebSphere Portal are at risk. Impact on confidentiality and integrity is low; however, availability is significantly impacted due to denial of service.
2. Technical Explanation
This vulnerability allows an authenticated attacker to cause a login loop in IBM WebSphere Portal. The root cause is an unspecified flaw within the portal’s authentication process. An attacker can exploit this by repeatedly logging into the affected system, causing it to continuously redirect back to the login page without completing the authentication process. This results in a denial of service for legitimate users.
- Root cause: Unspecified flaw in IBM WebSphere Portal’s authentication process.
- Exploit mechanism: An authenticated attacker repeatedly logs into the portal, triggering an infinite redirect loop.
- Scope: Affected versions of IBM WebSphere Portal are unspecified.
3. Detection and Assessment
To confirm vulnerability, check the installed version of IBM WebSphere Portal. A thorough assessment involves reviewing system logs for repeated login attempts from a single source.
- Quick checks: Check the WebSphere Portal version through the administration console or by examining installation directories.
- Scanning: Nessus plugin ID 4e5ca5ae may identify vulnerable systems, but results should be verified.
- Logs and evidence: Examine application logs for repeated login attempts originating from a single user account or IP address.
4. Solution / Remediation Steps
Apply Interim Fix PI16462 published by IBM to resolve this vulnerability. Follow the steps below for a safe and effective remediation.
4.1 Preparation
- Ensure you have sufficient disk space to install the fix. A roll back plan involves restoring from the backup created in the previous step.
- A change window may be needed depending on your environment and service level agreements. Approval from the IT security team is recommended.
4.2 Implementation
- Step 1: Download Interim Fix PI16462 from IBM’s support website (see References).
- Step 2: Apply the fix using the WebSphere Portal Installation Manager or the appropriate installation procedure for your environment.
4.3 Config or Code Example
Before
After
4.4 Security Practices Relevant to This Vulnerability
Implementing a strong patch cadence is crucial for addressing vulnerabilities like this one promptly. Least privilege can limit the impact if an attacker gains access. Input validation, while not directly applicable in this case, remains a general security best practice.
- Practice 1: Regular patching to ensure timely application of security fixes.
- Practice 2: Principle of least privilege to minimize potential damage from compromised accounts.
4.5 Automation (Optional)
Automation is not readily available for this specific fix; manual application via Installation Manager is typically required.
5. Verification / Validation
- Post-fix check: Verify that Interim Fix PI16462 is listed as an installed patch through the WebSphere Portal Installation Manager.
- Re-test: Attempt to log in repeatedly; ensure the login process completes successfully without looping.
- Monitoring: Monitor application logs for any errors related to authentication or login failures as a regression check.
6. Preventive Measures and Monitoring
Update security baselines to include the latest Interim Fixes for IBM WebSphere Portal. Implement regular vulnerability scanning in your CI/CD pipelines. Maintain a consistent patch review cycle based on risk assessment.
- Baselines: Update security configuration baselines to reflect the installed Interim Fix PI16462.
- Pipelines: Integrate vulnerability scans into deployment pipelines to identify missing patches.
- Asset and patch process: Establish a regular review cycle for IBM WebSphere Portal patches, typically monthly or quarterly depending on risk tolerance.
7. Risks, Side Effects, and Roll Back
Applying Interim Fixes can sometimes cause compatibility issues with custom portal extensions. Always test in a non-production environment first. If issues arise, roll back by restoring from the pre-fix backup created during preparation.
- Risk or side effect 2: Temporary service interruption during server restart; schedule maintenance accordingly.
- Roll back: Restore the WebSphere Portal configuration from the backup created prior to applying the fix.
8. References and Resources
- Vendor advisory or bulletin: http://www-01.ibm.com/support/docview.wss?uid=swg21672572
- NVD or CVE entry: CVE-2014-0959
- Product or platform documentation relevant to the fix: No specific documentation available beyond IBM’s advisory.