1. Introduction
The vulnerability, IBM WebSphere Portal Outside In Technology Multiple Overflows, affects Windows systems running affected versions of IBM WebSphere Portal software. It allows a remote attacker to execute arbitrary code by providing specially crafted files. This could lead to complete system compromise and data loss. The likely impact is high on confidentiality, integrity, and availability.
2. Technical Explanation
IBM WebSphere Portal versions are vulnerable to multiple remote code execution vulnerabilities within the Outside In Technology component. These stem from stack overflows in the Filters subcomponent of the OS/2 Metafile Parser (CVE-2013-5763) and the Microsoft Access database file format parser (CVE-2013-5791). An attacker can exploit these by sending a malicious file that triggers a buffer overflow, allowing them to execute code on the target system.
- Root cause: Insufficient boundary checks when parsing OS/2 Metafile and Microsoft Access files.
- Exploit mechanism: A remote attacker sends a specially crafted file (e.g., an image or database file) that overflows buffers in the Outside In Technology component, overwriting memory and executing arbitrary code.
- Scope: IBM WebSphere Portal 7.0.0.2 CF27 and 8.0.0.1 CF10 are affected.
3. Detection and Assessment
To confirm vulnerability, check the installed version of IBM WebSphere Portal. A thorough method involves reviewing system logs for evidence of exploitation attempts.
- Quick checks: Use the IBM Installation Manager to determine the installed version of WebSphere Portal.
- Scanning: Nessus plugin 87925 and 88557 may detect this vulnerability, but results should be verified.
- Logs and evidence: Check application logs for errors related to file parsing or memory access violations within the Outside In Technology component.
4. Solution / Remediation Steps
Apply Interim Fix PI07290, included in 7.0.0.2 CF27 and 8.0.0.1 CF10 to resolve the issue. Follow these steps carefully.
4.1 Preparation
- Ensure you have sufficient disk space for the installation process. A roll back plan is to restore from backup if issues occur.
- A change window may be required depending on service criticality; obtain approval from relevant stakeholders.
4.2 Implementation
- Step 1: Download Interim Fix PI07290 from the IBM support website (http://www-01.ibm.com/support/docview.wss?uid=swg21660640).
- Step 2: Use IBM Installation Manager to install the fix on your WebSphere Portal server.
4.3 Config or Code Example
Before
After
4.4 Security Practices Relevant to This Vulnerability
Implementing a robust patch management process and least privilege principles can help mitigate this vulnerability. Input validation is also important for preventing malicious file uploads.
- Practice 1: Patch Management – Regularly apply security patches from IBM to address known vulnerabilities in WebSphere Portal.
- Practice 2: Least Privilege – Ensure that users have only the necessary permissions to perform their tasks, limiting the impact of a potential exploit.
4.5 Automation (Optional)
5. Verification / Validation
- Post-fix check: Use IBM Installation Manager to confirm that the installed version is 7.0.0.2 CF27 or 8.0.0.1 CF10.
- Re-test: Re-run the version check from Section 3 to ensure it reports the updated, patched version.
- Smoke test: Verify that users can still log in and access core WebSphere Portal functionality.
- Monitoring: Monitor application logs for errors related to file parsing; a decrease in these errors may indicate successful mitigation.
6. Preventive Measures and Monitoring
Update security baselines to include the latest WebSphere Portal versions and configurations. Implement checks in CI/CD pipelines to prevent deployment of vulnerable software. Establish a regular patch review cycle.
- Baselines: Update your security baseline or policy to require 7.0.0.2 CF27 or 8.0.0.1 CF10 as the minimum acceptable version for WebSphere Portal.
- Pipelines: Add static application security testing (SAST) tools to your CI/CD pipeline to identify potential vulnerabilities in custom code deployed to WebSphere Portal.
- Asset and patch process: Implement a monthly patch review cycle to ensure timely installation of security updates from IBM.
7. Risks, Side Effects, and Roll Back
- Risk or side effect 1: Service interruption during installation and restart. Mitigation: Schedule maintenance window and communicate to users.
- Roll back: 1. Stop all WebSphere Portal services. 2. Restore the configuration from backup. 3. Restart all WebSphere Portal services.
8. References and Resources
- Vendor advisory or bulletin: http://www-01.ibm.com/support/docview.wss?uid=swg21660640
- NVD or CVE entry: CVE-2013-5763, CVE-2013-5791
- Product or platform documentation relevant to the fix: IBM WebSphere Portal documentation on applying Interim Fixes.