1. Introduction
The Invision Power Board index.php pop Parameter XSS vulnerability is a cross-site scripting flaw in the Invision Power Board web application. This allows an attacker to inject malicious scripts into webpages viewed by legitimate users, potentially stealing credentials or performing actions on their behalf. Systems running vulnerable versions of Invision Power Board are affected. A successful exploit could lead to loss of confidentiality, integrity and availability due to account compromise or data manipulation.
2. Technical Explanation
The vulnerability stems from insufficient input validation in the handling of the ‘pop’ parameter within the index.php script. An attacker can craft a malicious URL containing a specially designed payload that is then executed by users’ browsers when they visit the affected page. The CVE associated with this issue is CVE-2004-2279.
- Root cause: Missing input validation on the ‘pop’ parameter in index.php allows arbitrary JavaScript execution.
- Exploit mechanism: An attacker crafts a URL containing malicious JavaScript code within the ‘pop’ parameter, which is then executed when a user visits the link. For example:
http://example.com/index.php?module=member§ion=login&pop= - Scope: Invision Power Board versions prior to 2.1 are affected.
3. Detection and Assessment
To confirm vulnerability, check the installed version of Invision Power Board. Thorough assessment involves attempting a test exploit.
- Quick checks: Check the Invision Power Board version in the admin control panel (System > Server Information).
- Scanning: Nessus plugin ID 10673 may detect this vulnerability as an example only.
- Logs and evidence: Examine web server access logs for requests containing suspicious characters or JavaScript code within the ‘pop’ parameter of index.php.
# No specific command available, check version via admin panel4. Solution / Remediation Steps
Apply a fix to address the input validation issue in the Invision Power Board software.
4.1 Preparation
- Ensure you have access to the Invision Power Board installation directory and administrative credentials. Change windows should be scheduled during off-peak hours with appropriate approval.
4.2 Implementation
- Step 1: Upgrade Invision Power Board to version 2.1 or later, which includes a fix for this vulnerability. Download the latest version from the official Invision Power Board website.
- Step 2: Follow the upgrade instructions provided by Invision Power Board. This typically involves extracting the new files and running an upgrade script through the admin control panel.
4.3 Config or Code Example
Before
# No specific code example available, as this is a server-side vulnerability addressed through software updates. The root cause is insufficient input validation in index.phpAfter
# After upgrading to version 2.1 or later, the 'pop' parameter should be properly sanitized to prevent XSS attacks. Verify by attempting a test exploit after the upgrade.4.4 Security Practices Relevant to This Vulnerability
List only practices that directly address this vulnerability type. Use neutral wording and examples instead of fixed advice. For example: least privilege, input validation, safe defaults, secure headers, patch cadence.
- Practice 1: Input Validation – Implement strict input validation on all user-supplied data to prevent the injection of malicious scripts or code.
- Practice 2: Patch Cadence – Maintain a regular patching schedule for all software components, including Invision Power Board, to address known vulnerabilities promptly.
4.5 Automation (Optional)
# No automation script available for this specific vulnerability due to its nature requiring software upgrades. Consider automating Invision Power Board version checks as part of your asset management process.5. Verification / Validation
Confirm the fix by verifying the upgraded version and re-attempting the exploit.
- Post-fix check: Check the Invision Power Board version in the admin control panel (System > Server Information) to ensure it is 2.1 or later.
- Smoke test: Verify that core Invision Power Board functionality (login, posting, browsing) still works as expected.
- Monitoring: Monitor web server logs for any attempts to exploit the ‘pop’ parameter. Look for suspicious characters or JavaScript code in requests to index.php.
# Check version via admin panel: Expected output should be 2.1 or higher.6. Preventive Measures and Monitoring
Suggest only measures that are relevant to the vulnerability type. Use “for example” to keep advice conditional, not prescriptive.
- Baselines: Update your security baseline to require Invision Power Board version 2.1 or later.
- Pipelines: Integrate Static Application Security Testing (SAST) into your development pipeline to identify potential XSS vulnerabilities in custom code.
- Asset and patch process: Implement a regular patch management cycle for all web applications, including Invision Power Board, to address known security flaws promptly.
7. Risks, Side Effects, and Roll Back
- Risk or side effect 1: Upgrade process may cause temporary downtime. Mitigate by scheduling during off-peak hours.
8. References and Resources
- Vendor advisory or bulletin: https://www.invisionpowerboard.com/forum/topic/14923-security-update-v210/
- NVD or CVE entry: https://nvd.nist.gov/vuln/detail/CVE-2004-2279
- Product or platform documentation relevant to the fix: https://www.invisionpowerboard.com/docs/