1. Introduction
IBM WebSphere Portal is affected by an open redirect vulnerability (PI15689). This allows an attacker to trick a user into visiting a malicious website, potentially leading to phishing attacks and credential theft. Systems running vulnerable versions of IBM WebSphere Portal are at risk. A successful attack could compromise confidentiality through stolen credentials.
2. Technical Explanation
- Root cause: Improper validation of redirect URLs in IBM WebSphere Portal.
- Exploit mechanism: An attacker sends a crafted URL to a victim, containing a malicious redirect target. When the victim clicks the link, they are redirected to the attacker’s site. For example:
http://vulnerable-portal.example.com/redirect?url=http://attacker.example.com - Scope: IBM WebSphere Portal versions affected are not specified in the provided context.
3. Detection and Assessment
You can check if your system is vulnerable by identifying the version of IBM WebSphere Portal installed. Scanning tools may also help detect this issue.
- Quick checks: Check the WebSphere Portal administration console for the installed version.
- Scanning: Nessus signature ID 4e5ca5ae can be used to identify vulnerable systems, but results should be verified.
- Logs and evidence: Review application logs for redirect activity. Specific log files or event IDs are not provided in the context.
4. Solution / Remediation Steps
Apply Interim Fix PI15689 to address the open redirect vulnerability.
4.1 Preparation
- There are no specific dependencies listed in this context, but ensure you have sufficient disk space and administrative privileges. Roll back by restoring from backup.
- A change window may be required depending on your environment. Approval from IT security is recommended.
4.2 Implementation
- Step 1: Download Interim Fix PI15689 from IBM’s support website (http://www-01.ibm.com/support/docview.wss?uid=swg21672572).
- Step 2: Apply the fix according to IBM’s instructions in the advisory. This typically involves stopping the WebSphere Portal server, installing the patch, and restarting the server.
4.3 Config or Code Example
No specific config or code changes are provided in this context.
Before
After
4.4 Security Practices Relevant to This Vulnerability
Input validation and safe defaults are important practices for preventing this type of vulnerability.
- Practice 1: Input validation can prevent malicious URLs from being processed.
- Practice 2: Safe default configurations should avoid allowing redirects to arbitrary external sites.
4.5 Automation (Optional)
No automation scripts are provided in this context.
5. Verification / Validation
Confirm the fix by verifying the installed patch and testing for redirect functionality.
- Post-fix check: Check the WebSphere Portal administration console to confirm Interim Fix PI15689 is installed.
- Re-test: Attempt to access a URL with a malicious redirect target. The redirection should no longer work.
- Monitoring: Monitor application logs for any unexpected redirect activity.
6. Preventive Measures and Monitoring
Regular patching and security baselines can help prevent this issue.
- Baselines: Update your security baseline to include the latest patch for IBM WebSphere Portal.
- Pipelines: Integrate vulnerability scanning into your CI/CD pipeline.
- Asset and patch process: Implement a regular patch review cycle for all critical software, including IBM WebSphere Portal.
7. Risks, Side Effects, and Roll Back
Applying the fix may cause temporary service interruption. Always have a rollback plan in place.
- Risk or side effect 1: Applying the patch could temporarily disrupt WebSphere Portal services.
- Roll back: Restore from your pre-patch backup if issues occur.
8. References and Resources
Refer to official IBM documentation for more information.
- Vendor advisory or bulletin: http://www-01.ibm.com/support/docview.wss?uid=swg21672572
- NVD or CVE entry: CVE-2014-0958