1. Introduction
The IBM WebSphere Portal Web Content Viewer Portlet Privilege Escalation vulnerability affects Windows systems running affected versions of IBM WebSphere Portal software. This flaw allows a remote attacker to potentially gain elevated privileges, leading to sensitive information disclosure, denial of service, or control over the request dispatcher. This impacts confidentiality, integrity and availability.
2. Technical Explanation
The vulnerability stems from improper handling of JSP includes within the Web Content Viewer portlet. An attacker can exploit this by sending a specially crafted URL request that leverages these flawed includes to execute arbitrary code or access restricted resources. The CVE associated with this issue is CVE-2014-0954.
- Root cause: Improper handling of JSP includes in the Web Content Viewer portlet allows for execution of unintended code.
- Exploit mechanism: An attacker sends a malicious URL request containing a crafted JSP include that bypasses security checks and executes arbitrary commands on the server.
- Scope: IBM WebSphere Portal software is affected, specifically versions vulnerable to improper handling of JSP includes.
3. Detection and Assessment
To determine if your system is vulnerable, check the installed version of IBM WebSphere Portal. A thorough assessment involves reviewing server logs for suspicious activity related to JSP include requests.
- Quick checks: Check the IBM WebSphere Portal version through the administrative console or by examining installation directories.
- Scanning: Nessus vulnerability scanner may identify this issue with plugin ID 67421. This is an example only.
- Logs and evidence: Review application server logs for any errors related to JSP include processing, particularly those originating from the Web Content Viewer portlet.
4. Solution / Remediation Steps
Apply Interim Fix PI15723 provided by IBM to address this vulnerability. Follow the steps below for implementation.
4.1 Preparation
- Stop the affected IBM WebSphere Portal application server(s) to ensure a clean update process. Rollback involves restoring from backup or reverting the snapshot.
- A change window may be required depending on your environment and service level agreements. Approval from system owners is recommended.
4.2 Implementation
- Step 1: Download Interim Fix PI15723 from IBM’s support website (http://www-01.ibm.com/support/docview.wss?uid=swg21672572).
- Step 2: Apply the fix using the appropriate installation tool for your IBM WebSphere Portal environment, following IBM’s instructions.
4.3 Config or Code Example
Before
After
4.4 Security Practices Relevant to This Vulnerability
Implementing least privilege principles can limit the impact of a successful exploit. Input validation is also crucial for preventing malicious data from being processed by the application.
- Practice 1: Least privilege reduces the potential damage if an attacker gains control of the system.
- Practice 2: Input validation prevents attackers from injecting malicious code or commands through crafted requests.
4.5 Automation (Optional)
5. Verification / Validation
- Post-fix check: Verify that the installed version now includes Interim Fix PI15723 through the administrative console or installation directories.
- Re-test: Repeat the steps from the Detection and Assessment section; the vulnerability should no longer be present.
- Monitoring: Monitor application server logs for any errors related to JSP include processing.
6. Preventive Measures and Monitoring
Regularly update your security baselines to reflect the latest patches and configurations. Implement checks in CI/CD pipelines to prevent vulnerable code from being deployed.
- Baselines: Update your IBM WebSphere Portal security baseline to include Interim Fix PI15723 and any subsequent security updates.
- Asset and patch process: Establish a regular patch review cycle for IBM WebSphere Portal software, ensuring timely application of security fixes.
7. Risks, Side Effects, and Roll Back
- Risk or side effect 1: Service interruption during restart of application servers. Mitigate by scheduling maintenance windows and communicating downtime to users.
8. References and Resources
- Vendor advisory or bulletin: http://www-01.ibm.com/support/docview.wss?uid=swg21672572
- NVD or CVE entry: CVE-2014-0954
- Product or platform documentation relevant to the fix: N/A