CVE-2025-68507

Executive Summary

CVE-2025-68507 is a Missing Authorization vulnerability in the Icegram WordPress plugin, affecting versions from n/a through 3.1.35. This flaw allows an unauthenticated attacker to exploit incorrectly configured access control security levels, potentially leading to unauthorized data access or modification. The vulnerability is classified as a WordPress ecosystem issue, not related to Apache or Nginx. With a CVSS score of 6.5 (Medium), it poses a moderate risk, but the lack of a known patch and the plugin's widespread use in marketing automation make it a significant concern for site administrators.

Supply Chain & Package Security

This vulnerability affects the Icegram WordPress plugin, which is distributed through the official WordPress plugin repository and third-party marketplaces. Since it is a PHP-based plugin, it is not an NPM, PyPI, Go, or Ruby package. However, the supply chain risk is elevated due to the unknown patch status and the plugin's integration with email marketing and lead generation services. Administrators should verify the integrity of their plugin files and monitor for unauthorized modifications.

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

The threat level is Medium due to the low complexity and no required privileges, but the impact is limited to low confidentiality and integrity loss. The EPSS score of 0.0% suggests low exploitation likelihood currently, but this may change as more details emerge.

Deep Dive & Mechanics

The vulnerability resides in the Icegram plugin's access control mechanisms. The plugin likely uses capability checks or nonce verification to restrict access to its administrative functions (e.g., managing campaigns, viewing analytics, or modifying settings). Due to a missing authorization check, unauthenticated users can bypass these restrictions.

Root Cause: The plugin fails to properly validate user permissions before executing sensitive actions. This is a classic CWE-862: Missing Authorization flaw. For example, an AJAX handler or REST endpoint may not call current_user_can() or wp_verify_nonce() before processing requests.

Attack Vector: An attacker can send crafted HTTP requests to the vulnerable endpoints without authentication. The attack is network-based and requires no user interaction.

Impact: Successful exploitation could allow an attacker to:

• View sensitive campaign data or user information.
• Modify plugin settings or create unauthorized campaigns.
• Potentially leverage the plugin's email sending capabilities for phishing.

Vulnerable vs. Patched Code

Since no patch is available, we can only infer the vulnerable code pattern. A typical vulnerable snippet might look like:

// Vulnerable code (example)
add_action('wp_ajax_icegram_save_campaign', 'icegram_save_campaign');
add_action('wp_ajax_nopriv_icegram_save_campaign', 'icegram_save_campaign'); // Missing auth check

function icegram_save_campaign() {
    // Process request without checking user capabilities
    update_option('icegram_campaign_data', $_POST['data']);
}

A patched version would include authorization checks:

// Patched code (example)
add_action('wp_ajax_icegram_save_campaign', 'icegram_save_campaign');
// Remove nopriv hook to require authentication

function icegram_save_campaign() {
    if (!current_user_can('manage_options')) {
        wp_die('Unauthorized');
    }
    check_admin_referer('icegram_save_campaign');
    update_option('icegram_campaign_data', $_POST['data']);
}

Exploitation & Lab Setup

Red Team (Exploitation)

Prerequisites:

• Target WordPress site with Icegram plugin <= 3.1.35.
• No authentication required.

Exploitation Steps:

1. Identify Vulnerable Endpoint: Use a tool like Burp Suite or curl to probe for AJAX actions. Common Icegram actions include icegram_save_campaign, icegram_get_stats, or icegram_export_data.

2. Craft Request: Send a POST request to the WordPress AJAX handler without authentication.

curl -X POST http://target.com/wp-admin/admin-ajax.php \
  -d "action=icegram_get_stats&data=all"

3. Verify Unauthorized Access: If the response contains sensitive data (e.g., campaign stats, user emails), the vulnerability is confirmed.

Exploit-DB Code: None available.

Blue Team (Detection & Hardening)

Detection:

• Monitor for unusual AJAX requests to admin-ajax.php with Icegram actions from unauthenticated users.
• Look for spikes in icegram_* action calls in access logs.

Hardening:

• Disable the plugin until a patch is released.
• Implement a Web Application Firewall (WAF) rule to block unauthenticated requests to Icegram AJAX endpoints.
• Use a security plugin like Wordfence to add virtual patching.

Indicators of Compromise (IOCs)

• Network IOCs:

  • POST requests to /wp-admin/admin-ajax.php with action=icegram_* parameters from unauthenticated IPs.
  • Unusual outbound connections from the WordPress server to unknown IPs (if plugin is used for data exfiltration).

• File IOCs:

  • Modified plugin files in /wp-content/plugins/icegram/ (e.g., altered PHP files).
  • Unexpected options in the wp_options table prefixed with icegram_.

• Log IOCs:

  • Access logs showing 200 responses to admin-ajax.php without a valid session cookie.
  • Error logs with "Unauthorized" messages if a partial fix is applied.

Detection Engineering

YARA Rule

rule Detect_Icegram_Missing_Auth_CVE_2025_68507 {
    meta:
        description = "Detects Icegram plugin files with missing authorization patterns"
        author = "Valters IT"
        date = "2025-04-10"
        reference = "CVE-2025-68507"
    strings:
        $ajax_hook = /add_action\s*\(\s*['\"]wp_ajax_nopriv_icegram_/
        $missing_cap = /current_user_can\s*\(/
        $nonce_check = /check_admin_referer\s*\(/
    condition:
        $ajax_hook and not ($missing_cap or $nonce_check)
}

Sigma Rule

title: Unauthenticated Icegram AJAX Request
id: 8f4a3b2c-1d5e-6f7a-8b9c-0d1e2f3a4b5c
status: experimental
description: Detects unauthenticated POST requests to WordPress AJAX handler with Icegram actions
author: Valters IT
date: 2025-04-10
logsource:
    category: webserver
    product: apache
    service: access
detection:
    selection:
        cs-method: POST
        cs-uri-query|contains: admin-ajax.php
        cs-uri-query|contains: action=icegram_
        sc-status: 200
    filter:
        c-useragent|contains: WordPress
    condition: selection and not filter
falsepositives:
    - Legitimate unauthenticated Icegram actions (if any)
level: high

Suricata Rule

alert http any any -> $HOME_NET any (
    msg:"CVE-2025-68507 - Unauthenticated Icegram AJAX Request";
    flow:to_server,established;
    content:"POST";
    http_method;
    content:"/wp-admin/admin-ajax.php";
    http_uri;
    content:"action=icegram_";
    http_client_body;
    classtype:attempted-recon;
    sid:1000001;
    rev:1;
    reference:cve,2025-68507;
)

Remediation & Mitigation

Immediate Actions:

1. Disable the Icegram plugin until a patch is released.
2. Review server logs for signs of exploitation (unauthenticated AJAX requests).
3. Change all WordPress admin passwords and API keys if compromise is suspected.

Long-term Fix:

• Monitor the Icegram plugin repository for a patched version (>= 3.1.36).
• Apply the patch as soon as it becomes available.
• Implement a Web Application Firewall (WAF) with virtual patching for this CVE.

Workaround:

• Add a custom function to your theme's functions.php to block unauthenticated Icegram AJAX requests:

add_action('init', function() {
    if (defined('DOING_AJAX') && DOING_AJAX) {
        $action = $_REQUEST['action'] ?? '';
        if (strpos($action, 'icegram_') === 0 && !is_user_logged_in()) {
            wp_die('Unauthorized', 403);
        }
    }
});

Valters IT
Cyber Threat Intelligence & DevSecOps
Report generated for CVE-2025-68507