1. Introduction
The vulnerability GLSA-200703-23 affects WordPress, a popular content management system. It involves multiple cross-site scripting (XSS) and cross-site request forgery (CSRF) vulnerabilities, as well as path disclosure. This matters to businesses because attackers could steal user session data, perform actions on behalf of users without their consent, or gain further access to the system. Systems running WordPress are typically affected. Impact is likely to be high on confidentiality, medium on integrity, and low on availability.
2. Technical Explanation
WordPress contains several vulnerabilities stemming from insufficient input validation in various parameters used throughout the application. These include ‘year’ in wp_title(), ‘demo’ in admin.php, ‘post’ in post.php and page.php, ‘cat_ID’ in categories.php, and ‘c’ in comment.php, as well as ‘file’ in templates.php. Additionally, full PHP script paths are printed in some error messages. An attacker could craft a malicious URL that injects JavaScript code into a user’s browser session or trigger actions with the permissions of an authenticated user. The vulnerabilities are tracked under CVE-2007-1049, CVE-2007-1230, CVE-2007-1244 and CVE-2007-1409.
- Root cause: Missing or inadequate input validation in several WordPress parameters.
- Exploit mechanism: An attacker crafts a malicious URL containing JavaScript code that is executed when a user visits the link, potentially stealing cookies or performing actions as the logged-in user.
- Scope: All versions of WordPress prior to the fix are affected.
3. Detection and Assessment
Confirming vulnerability requires checking the installed WordPress version and reviewing application logs for suspicious activity. A thorough method involves source code review, but this is impractical in many cases.
- Quick checks: Check the WordPress version via the admin interface (Dashboard > About).
- Scanning: Nessus plugin ID 32581 may detect these vulnerabilities. This is an example only.
- Logs and evidence: Examine web server access logs for unusual requests containing JavaScript code or attempts to access sensitive files. Error messages revealing PHP script paths are also indicative.
# No command available to directly check this vulnerability without accessing the WordPress installation.4. Solution / Remediation Steps
Due to the numerous vulnerabilities, Gentoo recommends unmerging WordPress as a temporary solution. This prevents further exposure until a secure version is available.
4.1 Preparation
- Change window: Coordinate with system owners during off-peak hours.
4.2 Implementation
- Step 1: Unmerge the WordPress package using Portage.
4.3 Config or Code Example
Not applicable, as this solution involves removing the package.
4.4 Security Practices Relevant to This Vulnerability
Input validation and least privilege are key practices for mitigating XSS and CSRF vulnerabilities. Regularly patching software is also essential.
- Practice 1: Input validation prevents malicious code from being injected into the application.
- Practice 2: Least privilege limits the impact of successful exploits by restricting user permissions.
4.5 Automation (Optional)
Not applicable, as this solution involves removing the package.
5. Verification / Validation
Verify the fix by confirming that WordPress is no longer installed and accessible through your web server. Re-test by attempting to access the WordPress admin interface or any related pages.
- Post-fix check: Attempting to access the WordPress URL should result in an error indicating the package is not found.
- Re-test: Verify that previous vulnerable URLs no longer resolve to a working page.
- Smoke test: Ensure other web applications hosted on the same server are functioning correctly.
# No command available, as this involves checking website accessibility.6. Preventive Measures and Monitoring
- Baselines: Update security baselines with the latest WordPress vulnerability information.
- Pipelines: Integrate SCA tools into your CI pipeline to scan for vulnerable packages.
- Asset and patch process: Establish a regular patch review cycle for all web applications, including WordPress.
7. Risks, Side Effects, and Roll Back
Unmerging WordPress will render the website inaccessible until a patched version is available. The roll back steps involve re-emerging the package.
- Risk or side effect 1: Website downtime.
8. References and Resources
Official advisories provide the most accurate information about this vulnerability.
- Vendor advisory or bulletin: https://security.gentoo.org/glsa/200703-23
- NVD or CVE entry: N/A
- Product or platform documentation relevant to the fix: https://secuniaresearch.flexerasoftware.com/advisories/24430/