CVE-2023-32586

Executive Summary

CVE-2023-32586 is a Missing Authorization vulnerability in the WordPress plugin Soundcloud Is Gold (slug: soundcloud-is-gold), affecting versions up to and including 2.5.1. This flaw allows an unauthenticated attacker to exploit incorrectly configured access control security levels, potentially leading to unauthorized access to certain plugin functionalities or data. The vulnerability has a CVSS score of 4.3 (Medium) and a very low EPSS score (0.0%), indicating it is not currently being actively exploited in the wild. No public proof-of-concept (PoC) or exploit code has been released. The patch status is unknown, and no official fix has been confirmed by the vendor.

Supply Chain & Package Security

This vulnerability affects a WordPress plugin distributed through the official WordPress plugin repository. Users who have installed the plugin via the WordPress admin dashboard or through automated deployment tools (e.g., Composer, WP-CLI) are at risk. Since the plugin is not an NPM, PyPI, Go, or Ruby package, supply chain risks are limited to the WordPress ecosystem. However, if the plugin is bundled within a larger WordPress theme or custom build, the risk propagates to those deployments.

CVSS Breakdown & Threat Level

• CVSS Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
• Base Score: 4.3 (Medium)
• Attack Vector: Network (AV:N) – The vulnerability can be exploited remotely.
• Attack Complexity: Low (AC:L) – No special conditions are required.
• Privileges Required: None (PR:N) – No authentication needed.
• User Interaction: None (UI:N) – No user action required.
• Scope: Unchanged (S:U) – The exploit does not affect other components.
• Confidentiality Impact: Low (C:L) – Limited information disclosure.
• Integrity Impact: None (I:N) – No data modification.
• Availability Impact: None (A:N) – No denial of service.

Threat Level: Medium. The vulnerability is easy to exploit but has limited impact. The lack of public PoC and low EPSS score reduces immediate risk, but unpatched installations remain vulnerable.

Deep Dive & Mechanics

The vulnerability stems from a Missing Authorization check in the soundcloud-is-gold plugin. The plugin likely exposes AJAX actions or REST API endpoints that perform sensitive operations (e.g., retrieving SoundCloud API keys, user data, or plugin settings) without verifying that the requesting user has the necessary permissions (e.g., manage_options capability). An unauthenticated attacker can directly call these endpoints to access protected data.

Root Cause: The plugin fails to implement WordPress capability checks (e.g., current_user_can()) or nonce verification in certain functions. This allows any remote user to trigger the vulnerable functionality.

Attack Vector: The attacker sends a crafted HTTP request to the vulnerable endpoint. For example:

POST /wp-admin/admin-ajax.php
action=soundcloud_is_gold_get_api_key

Without proper authorization, the plugin returns the API key or other sensitive data.

Impact: An attacker could:

• Retrieve SoundCloud API credentials.
• Access plugin configuration data.
• Potentially leverage the API key for further attacks on SoundCloud services.

Vulnerable vs. Patched Code

Since no official patch is available, the following is a hypothetical comparison based on common fixes for missing authorization vulnerabilities.

Vulnerable Code (soundcloud-is-gold.php):

add_action('wp_ajax_nopriv_soundcloud_is_gold_get_api_key', 'soundcloud_is_gold_get_api_key');
function soundcloud_is_gold_get_api_key() {
    $api_key = get_option('soundcloud_is_gold_api_key');
    wp_send_json_success(array('api_key' => $api_key));
}

Patched Code (Hypothetical):

add_action('wp_ajax_soundcloud_is_gold_get_api_key', 'soundcloud_is_gold_get_api_key');
function soundcloud_is_gold_get_api_key() {
    if (!current_user_can('manage_options')) {
        wp_die('Unauthorized', 403);
    }
    $api_key = get_option('soundcloud_is_gold_api_key');
    wp_send_json_success(array('api_key' => $api_key));
}

Key Differences:

• The vulnerable code uses wp_ajax_nopriv_ (allows unauthenticated access) instead of wp_ajax_ (requires authentication).
• The patched code adds a capability check (current_user_can('manage_options')) to restrict access to administrators.

Exploitation & Lab Setup

Red Team (Offensive)

Prerequisites:

• A WordPress installation with the soundcloud-is-gold plugin version <= 2.5.1.
• Network access to the target.

Exploitation Steps:

1. Identify the vulnerable endpoint by analyzing the plugin source code or using a fuzzer.
2. Send a crafted request to the endpoint. Example using curl:

   curl -X POST http://target.com/wp-admin/admin-ajax.php \
        -d "action=soundcloud_is_gold_get_api_key"
   

3. If successful, the response will contain sensitive data (e.g., API key).

Automated Exploit (Python):

import requests

target = "http://target.com/wp-admin/admin-ajax.php"
data = {"action": "soundcloud_is_gold_get_api_key"}
response = requests.post(target, data=data)
if response.status_code == 200:
    print(response.json())

Blue Team (Defensive)

Detection:

• Monitor for unusual AJAX requests to admin-ajax.php with action parameters containing soundcloud_is_gold.
• Look for requests from unauthenticated users to endpoints that should require admin privileges.

Mitigation:

• Disable the plugin until a patch is available.
• Implement a Web Application Firewall (WAF) rule to block requests to soundcloud_is_gold_* actions from unauthenticated users.
• Use a WordPress security plugin (e.g., Wordfence) to add virtual patching.

Indicators of Compromise (IOCs)

• Network IOCs:

  • HTTP POST requests to /wp-admin/admin-ajax.php with action=soundcloud_is_gold_* parameters.
  • Unusual outbound connections to SoundCloud API endpoints from the WordPress server.

• File IOCs:

  • Presence of the plugin directory: /wp-content/plugins/soundcloud-is-gold/
  • Modified plugin files (e.g., soundcloud-is-gold.php) with unauthorized changes.

• Log IOCs:

  • WordPress debug log entries showing failed capability checks or unexpected AJAX calls.
  • Web server access logs with repeated POST /wp-admin/admin-ajax.php requests from the same IP.

Detection Engineering

YARA Rule

rule CVE_2023_32586_Soundcloud_Is_Gold {
    meta:
        description = "Detects vulnerable Soundcloud Is Gold plugin files"
        author = "Valters IT"
        date = "2025-04-10"
        cve = "CVE-2023-32586"
    strings:
        $vuln_func = "wp_ajax_nopriv_soundcloud_is_gold" nocase
        $vuln_action = "soundcloud_is_gold_get_api_key" nocase
    condition:
        $vuln_func or $vuln_action
}

Sigma Rule

title: CVE-2023-32586 - Missing Authorization in Soundcloud Is Gold
id: 8a4b3c2d-1e5f-4a7b-9c8d-0e1f2a3b4c5d
status: experimental
description: Detects exploitation attempts against CVE-2023-32586
author: Valters IT
date: 2025-04-10
logsource:
    category: webserver
    product: apache
detection:
    selection:
        cs-method: 'POST'
        cs-uri-query|contains: 'admin-ajax.php'
        cs-uri-query|contains: 'action=soundcloud_is_gold'
    condition: selection
falsepositives:
    - Legitimate admin actions (if admin is using the plugin)
level: medium

Suricata Rule

alert http any any -> any any (msg:"CVE-2023-32586 - Soundcloud Is Gold Missing Authorization Exploit"; flow:to_server,established; content:"POST"; http_method; content:"admin-ajax.php"; http_uri; content:"action=soundcloud_is_gold"; http_client_body; classtype:attempted-recon; sid:1000001; rev:1;)

Remediation & Mitigation

Immediate Actions:

1. Disable the plugin if not essential for business operations.
2. Apply virtual patching via WAF to block unauthenticated requests to soundcloud_is_gold_* actions.
3. Monitor logs for exploitation attempts.

Long-term Fix:

• The vendor must release a patched version that adds proper authorization checks (e.g., current_user_can() and nonce verification).
• Users should update to the latest version once available.

Workaround:

• If the plugin is critical, manually edit the plugin file to add capability checks (see patched code example above). Note: This will be overwritten on plugin updates.

Valters IT
Securing Digital Frontiers