How to remediate – Oracle Reports Server test.jsp Multiple Parameter XSS

1. Introduction

The Oracle Reports Server test.jsp Multiple Parameter XSS vulnerability allows an attacker to inject malicious scripts into web pages viewed by other users. This can lead to session hijacking, defacement of websites, or redirection to harmful sites. Systems running vulnerable versions of Oracle Report Server are affected. A successful attack could compromise the confidentiality, integrity and availability of data processed by the server.

2. Technical Explanation

This vulnerability occurs because the application does not properly sanitise user-supplied input when handling parameters in the ‘test.jsp’ file. An attacker can craft a malicious URL containing XSS payloads that are then executed in the context of other users’ browsers. CVE-2005-0873 details this issue.

• Root cause: Insufficient input validation on parameters processed by test.jsp.
• Exploit mechanism: An attacker crafts a URL with a malicious script injected into a parameter, which is then executed when another user visits the link. For example: http://example.com/reports/Tools/test.jsp?parameter=
• Scope: Oracle Report Server versions prior to those with fixes for CVE-2005-0873 are affected.

3. Detection and Assessment

Confirming vulnerability requires checking the installed version of Oracle Report Server and verifying access to the ‘test.jsp’ file. A thorough assessment involves attempting to inject a simple XSS payload.

• Quick checks: Check the Oracle Report Server version using the application’s administration interface or by examining server logs for version information.
• Scanning: Nessus plugin ID 16853 may identify this vulnerability, but results should be verified manually.
• Logs and evidence: Examine web server access logs for requests to ‘reports/Tools/test.jsp’ containing suspicious characters or script tags.

# No specific command available without knowing the OS and Oracle installation details. Check application version via UI.

4. Solution / Remediation Steps

The primary solution is to disable access to the ‘reports/Tools/test.jsp’ file, as it’s not typically required for normal operation.

4.1 Preparation

• No dependencies are known, but ensure you understand the impact of disabling this file on any custom reports that might rely on it. Change windows may be needed for production systems and require approval from application owners.

4.2 Implementation

1. Step 1: Deny access to ‘reports/Tools/test.jsp’ through your web server configuration (e.g., Apache, IIS).
2. Step 2: Restart the Oracle Report Server service for the changes to take effect.

4.3 Config or Code Example

Before

# Apache example - no specific rule blocking test.jsp
<Directory /path/to/oracle_reports>
    Options Indexes FollowSymLinks
    AllowOverride None
    Require all granted
</Directory>

After

# Apache example - blocking access to test.jsp
<Directory /path/to/oracle_reports>
    Options Indexes FollowSymLinks
    AllowOverride None
    Require all granted
    <Files test.jsp>
        Order deny,allow
        Deny from all
    </Files>
</Directory>

4.4 Security Practices Relevant to This Vulnerability

Several security practices can help prevent XSS vulnerabilities. Least privilege limits the impact of successful attacks, while input validation prevents malicious data from being processed.

• Practice 1: Implement least privilege principles for all application accounts and services.
• Practice 2: Enforce strict input validation on all user-supplied data to block potentially harmful characters or scripts.

4.5 Automation (Optional)

No specific automation script is provided due to the variability of web server configurations. However, configuration management tools like Ansible can be used to automate changes to web server access control rules.

# Example Ansible task - blocking test.jsp in Apache
- name: Block access to test.jsp
  lineinfile:
    path: /etc/apache2/sites-available/your_site.conf
    insertafter: '^<Directory /path/to/oracle_reports>'
    line: '    <Files test.jsp>'
  notify: Restart Apache

5. Verification / Validation

Confirm the fix by attempting to access ‘test.jsp’ and verifying that it is blocked. Re-run the earlier detection method to confirm the vulnerability is no longer present.

• Post-fix check: Attempt to access http://example.com/reports/Tools/test.jsp in a web browser. Expect an HTTP 403 Forbidden error or similar access denied message.
• Re-test: Scan the system again using Nessus plugin ID 16853 and confirm that it no longer reports the vulnerability.
• Monitoring: Monitor web server access logs for any attempts to access ‘reports/Tools/test.jsp’ which should now be blocked.

# Attempting to access http://example.com/reports/Tools/test.jsp should return a 403 Forbidden error.

6. Preventive Measures and Monitoring

Regular security baselines and pipeline checks can help prevent similar vulnerabilities. A consistent patch process ensures that known issues are addressed promptly.

• Baselines: Update your security baseline to include a rule blocking access to ‘reports/Tools/test.jsp’.
• Pipelines: Add static application security testing (SAST) tools to your CI pipeline to identify potential XSS vulnerabilities during development.
• Asset and patch process: Implement a regular patch review cycle for all Oracle products, including Report Server.

7. Risks, Side Effects, and Roll Back

Disabling ‘test.jsp’ may impact custom reports that rely on it. A roll back involves re-enabling access to the file through your web server configuration.

• Roll back: Step 1: Remove the blocking rule from your web server configuration. Step 2: Restart the Oracle Report Server service.

8. References and Resources

• Vendor advisory or bulletin: Oracle Critical Patch Update
• NVD or CVE entry: CVE-2005-0873
• Product or platform documentation relevant to the fix: Oracle Report Server Security Guide