CVE-2025-29007

Executive Summary

CVE-2025-29007 is a Missing Authorization vulnerability in the LMSACE Connect WordPress plugin (versions up to and including 3.4). This flaw allows an authenticated attacker with low privileges to exploit incorrectly configured access control security levels, potentially leading to unauthorized access to sensitive data or functionality. The vulnerability is classified as Medium Severity (CVSS 4.3) and currently has no known public exploit or patch. As a WordPress plugin issue, this affects the WordPress ecosystem directly and should be addressed by the plugin vendor.

Supply Chain & Package Security

This vulnerability resides in a WordPress plugin distributed via the official WordPress plugin repository. Organizations using LMSACE Connect should treat this as a supply chain risk, as the plugin may be bundled in managed WordPress environments or custom builds. No OSV or GitHub advisory data is available, and the patch status remains unknown.

CVSS Breakdown & Threat Level

• CVSS Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N
• Base Score: 4.3 (Medium)
• Attack Vector: Network
• Attack Complexity: Low
• Privileges Required: Low
• User Interaction: None
• Scope: Unchanged
• Confidentiality Impact: Low
• Integrity Impact: None
• Availability Impact: None

The low EPSS score (0.0%) suggests active exploitation is unlikely at this time, but the missing authorization flaw could be leveraged in chained attacks.

Deep Dive & Mechanics

The vulnerability stems from improper access control checks in the LMSACE Connect plugin. The plugin likely exposes REST API endpoints or AJAX actions that fail to verify user capabilities before executing sensitive operations. An attacker with a subscriber-level account (or higher) can send crafted requests to access or modify data intended for administrators only.

Root Cause: The plugin does not enforce current_user_can() checks on certain functions, allowing low-privileged users to invoke administrative actions.

Attack Vector: Network-based, requiring authentication but no special privileges beyond a standard user account.

Impact: Unauthorized reading of configuration data, user lists, or other sensitive information stored by the plugin.

Vulnerable vs. Patched Code

Since no patch is available, the vulnerable code pattern is described generically:

Vulnerable Code (PHP):

add_action('wp_ajax_lmsace_connect_get_data', 'lmsace_connect_get_data');
function lmsace_connect_get_data() {
    // Missing capability check
    $data = get_option('lmsace_connect_settings');
    wp_send_json_success($data);
}

Patched Code (Hypothetical):

add_action('wp_ajax_lmsace_connect_get_data', 'lmsace_connect_get_data');
function lmsace_connect_get_data() {
    if (!current_user_can('manage_options')) {
        wp_die('Unauthorized');
    }
    $data = get_option('lmsace_connect_settings');
    wp_send_json_success($data);
}

Exploitation & Lab Setup

Red Team

Prerequisites:

• WordPress instance with LMSACE Connect <= 3.4 installed
• Valid low-privilege user credentials (e.g., subscriber)

Exploitation Steps:

1. Authenticate to WordPress as a subscriber.
2. Identify vulnerable AJAX actions or REST endpoints (e.g., via plugin source code analysis).
3. Send a crafted request to the endpoint:

curl -X POST 'http://target/wp-admin/admin-ajax.php' \
  -d 'action=lmsace_connect_get_data' \
  --cookie 'wordpress_logged_in_xxx=...'

4. Observe unauthorized data disclosure in the response.

No public exploit code is available.

Blue Team

Detection:

• Monitor for unusual AJAX requests from low-privilege users to plugin-specific actions.
• Look for action=lmsace_connect_* parameters in POST requests.
• Alert on access to /wp-admin/admin-ajax.php with non-admin cookies.

Hunting:

• Search logs for lmsace_connect in request URIs.
• Correlate user roles with accessed endpoints.

Indicators of Compromise (IOCs)

• Network: HTTP POST requests to /wp-admin/admin-ajax.php with action=lmsace_connect_* parameters from non-admin users.
• File: Presence of plugin files in /wp-content/plugins/lmsace-connect/ (version <= 3.4).
• Log: WordPress debug logs showing capability errors or unauthorized access attempts.

Detection Engineering

YARA Rule

rule CVE_2025_29007_LMSACE_Connect_Missing_Auth {
    meta:
        description = "Detects vulnerable LMSACE Connect plugin files"
        author = "Valters IT"
        date = "2025-04-01"
        reference = "CVE-2025-29007"
    strings:
        $func1 = "lmsace_connect_get_data" ascii wide nocase
        $func2 = "lmsace_connect_update_settings" ascii wide nocase
        $func3 = "current_user_can" ascii wide nocase
    condition:
        any of ($func1, $func2) and not $func3
}

Sigma Rule

title: CVE-2025-29007 - LMSACE Connect Missing Authorization
id: 8a4b3c2d-1e5f-4a7b-9c8d-0e1f2a3b4c5d
status: experimental
description: Detects exploitation attempts against CVE-2025-29007
author: Valters IT
logsource:
    category: webserver
    product: apache
detection:
    selection:
        cs-method: 'POST'
        c-uri|contains: '/wp-admin/admin-ajax.php'
        cs-uri-query|contains: 'action=lmsace_connect_'
    condition: selection
falsepositives:
    - Legitimate admin usage
level: medium

Suricata Rule

alert http $HOME_NET any -> $EXTERNAL_NET any (
    msg:"CVE-2025-29007 - LMSACE Connect Missing Authorization Exploit";
    flow:to_server,established;
    content:"POST"; http_method;
    content:"/wp-admin/admin-ajax.php"; http_uri;
    content:"action=lmsace_connect_"; http_client_body;
    classtype:attempted-recon;
    sid:10000001;
    rev:1;
)

Remediation & Mitigation

Immediate Actions:

1. Disable the plugin until a patch is released.
2. Restrict access to /wp-admin/admin-ajax.php via .htaccess or WAF rules for non-admin users.
3. Monitor logs for suspicious AJAX requests.

Long-term:

• Apply vendor patch when available.
• Implement principle of least privilege for WordPress user roles.
• Use a Web Application Firewall (WAF) to block unauthorized AJAX calls.

Workaround: Add a custom capability check via a mu-plugin:

add_action('init', function() {
    if (defined('DOING_AJAX') && DOING_AJAX) {
        $action = $_REQUEST['action'] ?? '';
        if (strpos($action, 'lmsace_connect_') === 0 && !current_user_can('manage_options')) {
            wp_die('Unauthorized');
        }
    }
});

Valters IT
Securing Digital Frontiers