1. Introduction
The IBM WebSphere Portal Web Content Viewer Portlet is affected by a cross-site scripting (XSS) vulnerability (PM84525). This allows an attacker to inject malicious code into a user’s browser, potentially stealing cookies or redirecting the user to a harmful website. Systems running vulnerable versions of IBM WebSphere Portal are at risk. Successful exploitation could lead to loss of confidentiality, integrity and availability of data.
2. Technical Explanation
The vulnerability is due to insufficient input validation in the Web Content Viewer Portlet. An attacker can inject arbitrary JavaScript code through a crafted URL or request parameter. This injected script will then execute within the context of the user’s browser, allowing for session hijacking and other malicious activities. CVE-2013-0549 has been assigned to this vulnerability.
- Root cause: Missing input validation on user-supplied data in the Web Content Viewer Portlet.
- Exploit mechanism: An attacker crafts a URL containing malicious JavaScript code, which is then executed when a user visits the link. For example, an attacker could send a phishing email with a link to a compromised portal page.
- Scope: IBM WebSphere Portal versions 7.0.0.2 CF21 and earlier, and 8.0.0.x CF04 and earlier are affected.
3. Detection and Assessment
To confirm vulnerability, check the installed version of WebSphere Portal. Thorough assessment can be done using a web application scanner.
- Quick checks: Use the IBM Installation Manager to verify the product version.
- Scanning: Nessus plugin ID 8806f7cc may detect this vulnerability. This is an example only, and other scanners may also provide detection capabilities.
- Logs and evidence: Examine web server logs for suspicious URL parameters or JavaScript code within requests to the Web Content Viewer Portlet.
# Example command placeholder:
# No specific command available for this vulnerability. Check IBM Installation Manager GUI.
4. Solution / Remediation Steps
4.1 Preparation
- Take a full backup of the WebSphere Portal system or create a snapshot if using virtual machines. Stop any dependent services, such as application servers, if required by the fix installation process.
- Ensure you have sufficient disk space for the Interim Fix download and installation. A roll back plan involves restoring from the pre-fix backup or snapshot.
- A change window may be needed depending on your environment. Approval from the security team is recommended.
4.2 Implementation
- Step 1: Download Interim Fix PM84525 from IBM Support (https://www-304.ibm.com/support/docview.wss?uid=swg21638984).
- Step 2: Apply the fix using the Installation Manager. Follow the instructions provided in the Interim Fix documentation.
4.3 Config or Code Example
No configuration changes are required as this vulnerability is addressed through a software patch.
Before
After
4.4 Security Practices Relevant to This Vulnerability
Input validation and patch management are key practices for preventing this issue.
- Practice 1: Implement strict input validation on all user-supplied data to prevent the injection of malicious code.
- Practice 2: Maintain a regular patch cadence to apply security fixes promptly, minimizing exposure to known vulnerabilities.
4.5 Automation (Optional)
Automation is not directly applicable for this vulnerability due to the nature of the fix installation process.
5. Verification / Validation
Verify the fix by checking the installed version and re-testing with a known exploit payload.
- Post-fix check: Use IBM Installation Manager to confirm that Interim Fix PM84525 is applied, or verify the WebSphere Portal version is 7.0.0.2 CF22 or later, or 8.0.0.x CF05 or later.
- Re-test: Attempt to inject a test XSS payload through the Web Content Viewer Portlet and confirm that it is not executed.
- Monitoring: Monitor web server logs for any suspicious activity related to the Web Content Viewer Portlet.
# Example command placeholder:
# No specific command available for this vulnerability. Check IBM Installation Manager GUI.
6. Preventive Measures and Monitoring
Regular security baselines, input validation checks in CI/CD pipelines, and a robust patch management process can help prevent similar issues.
- Baselines: Update your WebSphere Portal security baseline to include the latest Interim Fixes and security recommendations.
- Pipelines: Implement static code analysis (SAST) tools to identify potential XSS vulnerabilities during development.
- Asset and patch process: Establish a regular schedule for reviewing and applying security patches, including those released by IBM.
7. Risks, Side Effects, and Roll Back
Applying Interim Fixes may occasionally cause compatibility issues with custom applications or extensions. A roll back plan is essential.
- Risk or side effect 2: Service interruption during restart. Mitigation: Schedule the installation during off-peak hours and ensure sufficient resources are available.
8. References and Resources
- Vendor advisory or bulletin: https://www-304.ibm.com/support/docview.wss?uid=swg21638984
- NVD or CVE entry: http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2013-0549
- Product or platform documentation relevant to the fix: IBM WebSphere Portal documentation on applying Interim Fixes.