CVE-2025-30916

Executive Summary

CVE-2025-30916 is a Missing Authorization vulnerability in the Residential Address Detection WordPress plugin by enituretechnology. This flaw allows unauthenticated attackers to exploit incorrectly configured access control security levels, potentially leading to unauthorized data access or manipulation of address detection logic. The vulnerability affects all versions up to and including 2.5.4. No public exploit code or patch is currently available, but the risk is elevated due to the plugin’s exposure on WordPress sites.

Supply Chain & Package Security

This vulnerability resides in a WordPress plugin distributed via the official WordPress plugin repository. Users who installed the plugin from the repository are affected. No known supply chain compromise has been reported, but the lack of a patch increases the risk of malicious actors leveraging this flaw in targeted attacks.

CVSS Breakdown & Threat Level

• CVSS Score: 6.5 (Medium)
• Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N
• Attack Vector: Network
• Attack Complexity: Low
• Privileges Required: None
• User Interaction: None
• Scope: Unchanged
• Confidentiality Impact: Low
• Integrity Impact: Low
• Availability Impact: None

Threat Level: Medium. The vulnerability is easy to exploit remotely without authentication, but the impact is limited to low confidentiality and integrity loss. However, in the context of address detection, this could lead to privacy breaches or manipulation of location-based services.

Deep Dive & Mechanics

The vulnerability stems from missing authorization checks in the plugin’s AJAX handlers or REST endpoints. The plugin likely exposes functions to detect residential addresses without verifying user permissions. An attacker can send crafted HTTP requests to trigger these functions, bypassing intended access controls.

Root Cause: The plugin fails to implement current_user_can() checks or nonce verification in critical endpoints, allowing unauthenticated access to administrative or privileged actions.

Attack Vector: An unauthenticated attacker sends a POST/GET request to a vulnerable endpoint (e.g., /wp-admin/admin-ajax.php?action=rad_detect_address) with malicious parameters. The plugin processes the request without verifying the user’s role or capability.

Potential Impact:

• Unauthorized access to stored address data.
• Manipulation of address detection results (e.g., marking a commercial address as residential).
• Information disclosure of internal plugin configurations.

Vulnerable vs. Patched Code

Since no patch is available, the vulnerable code is assumed to be present in all versions <= 2.5.4. A hypothetical patched version would include proper capability checks.

Vulnerable Code (PHP):

add_action('wp_ajax_nopriv_rad_detect_address', 'rad_detect_address_handler');
function rad_detect_address_handler() {
    // No permission check
    $address = sanitize_text_field($_POST['address']);
    // Process address detection...
    echo json_encode($result);
    wp_die();
}

Patched Code (Hypothetical):

add_action('wp_ajax_nopriv_rad_detect_address', 'rad_detect_address_handler');
function rad_detect_address_handler() {
    if (!current_user_can('manage_options')) {
        wp_die('Unauthorized', 403);
    }
    check_ajax_referer('rad_nonce', 'nonce');
    $address = sanitize_text_field($_POST['address']);
    // Process address detection...
    echo json_encode($result);
    wp_die();
}

Exploitation & Lab Setup

Red Team (Exploitation)

Prerequisites:

• Target WordPress site with Residential Address Detection plugin <= 2.5.4.
• Network access to the site.

Exploitation Steps:

1. Identify the vulnerable endpoint (e.g., via source code review or fuzzing).
2. Send a crafted HTTP request to trigger the missing authorization.

Example Request (cURL):

curl -X POST https://target-site.com/wp-admin/admin-ajax.php \
  -d "action=rad_detect_address&address=123+Main+St"

Expected Response: The plugin returns address detection data without authentication.

Advanced Exploitation: Use automated tools like Burp Suite or custom scripts to enumerate all AJAX actions and test for missing authorization.

Blue Team (Detection & Defense)

Detection:

• Monitor for unusual AJAX requests to admin-ajax.php with actions related to rad_ or residential_address.
• Alert on requests from unauthenticated users to endpoints that should require admin privileges.

Defense:

• Immediately disable or remove the plugin until a patch is available.
• Implement a Web Application Firewall (WAF) rule to block requests to known vulnerable endpoints.
• Use a WordPress security plugin to enforce capability checks on all AJAX actions.

WAF Rule (ModSecurity):

SecRule REQUEST_URI "/wp-admin/admin-ajax.php" \
  "chain,id:1001,deny,status:403,msg:'Residential Address Detection Exploit Attempt'"
SecRule ARGS:action "^rad_" "t:lowercase"

Indicators of Compromise (IOCs)

• Network IOCs:

  • HTTP requests to /wp-admin/admin-ajax.php with action=rad_* parameters from unauthenticated sources.
  • Unusual POST data containing address or detect keywords.

• File IOCs:

  • Presence of the plugin directory /wp-content/plugins/residential-address-detection/.
  • Modified plugin files (e.g., rad-ajax.php) with suspicious code.

• Log IOCs:

  • WordPress debug logs showing wp_ajax_nopriv_* actions without nonce verification.
  • Web server logs with 200 responses to admin-ajax.php from unauthenticated IPs.

Detection Engineering

YARA Rule

rule Detect_Residential_Address_Detection_Exploit {
    meta:
        description = "Detects exploitation attempts of CVE-2025-30916 in WordPress logs"
        author = "Valters IT"
        date = "2025-04-01"
        reference = "CVE-2025-30916"
    strings:
        $ajax_action = "action=rad_" nocase
        $admin_ajax = "/wp-admin/admin-ajax.php" nocase
        $address_param = "address=" nocase
    condition:
        all of them
}

Sigma Rule

title: CVE-2025-30916 Exploitation Attempt
id: 8a9b7c6d-5e4f-3a2b-1c0d-9e8f7a6b5c4d
status: experimental
description: Detects unauthenticated AJAX requests to Residential Address Detection plugin
author: Valters IT
logsource:
    category: webserver
    product: apache
detection:
    selection:
        cs-method: 'POST'
        cs-uri-query|contains: '/wp-admin/admin-ajax.php'
        cs-uri-query|contains: 'action=rad_'
    condition: selection
falsepositives:
    - Legitimate admin actions (rare)
level: high

Suricata Rule

alert http any any -> any any (
    msg:"CVE-2025-30916 - Residential Address Detection Exploit Attempt";
    flow:to_server,established;
    content:"POST"; http_method;
    content:"/wp-admin/admin-ajax.php"; http_uri;
    content:"action=rad_"; http_client_body;
    classtype:attempted-admin;
    sid:1000001;
    rev:1;
)

Remediation & Mitigation

Immediate Actions:

1. Disable the plugin until a patch is released by the vendor.
2. Remove the plugin if not critical to business operations.
3. Apply virtual patching via WAF rules to block exploitation attempts.

Long-Term Fix:

• Monitor the vendor’s website for an updated version with proper authorization checks.
• Implement a WordPress security policy that requires all plugins to undergo code review for missing authorization vulnerabilities.

Workaround:

• Add custom code to the theme’s functions.php to enforce capability checks on all AJAX actions:

add_action('wp_ajax_nopriv_*', function() {
    wp_die('Unauthorized', 403);
}, 1);

Valters IT Signature This report was generated by Valters IT DevSecOps AI. For questions, contact security@valters-it.com.