CVE-2024-56213

Executive Summary

CVE-2024-56213 is a Path Traversal vulnerability in the Themewinter Eventin WordPress plugin (wp-event-solution), affecting versions up to and including 4.0.7. The vulnerability allows an unauthenticated attacker to traverse directories using the .../...// pattern, potentially reading arbitrary files on the server. This is a WordPress ecosystem issue, not related to Apache or Nginx. The CVSS score is 6.5 (Medium), with low confidentiality impact but no integrity or availability impact. No public proof-of-concept or patch details are currently available.

Supply Chain & Package Security

This vulnerability affects the WordPress plugin ecosystem. The plugin is distributed via the official WordPress plugin repository and third-party marketplaces. Users should verify the integrity of their plugin files and monitor for updates from the vendor.

CVSS Breakdown & Threat Level

• Attack Vector (AV): Network (N) – Exploitable remotely.
• Attack Complexity (AC): Low (L) – No special conditions required.
• Privileges Required (PR): None (N) – No authentication needed.
• User Interaction (UI): None (N) – No user action required.
• Scope (S): Unchanged (U) – The vulnerable component remains the same.
• Confidentiality (C): Low (L) – Limited file read possible.
• Integrity (I): None (N) – No file modification.
• Availability (A): None (N) – No denial of service.

Threat Level: Medium. The vulnerability allows limited file disclosure but no code execution or data modification.

Deep Dive & Mechanics

The vulnerability resides in the file handling logic of the Eventin plugin. The plugin fails to properly sanitize user-supplied file paths, allowing traversal sequences like .../...// to bypass basic filters. This pattern exploits the fact that some path normalization functions treat ... as a valid directory name, while // is collapsed, enabling directory escape.

The vulnerable code likely uses a function like realpath() or basename() without proper validation, or uses string replacement that only removes ../ but not .../...//. An attacker can craft a URL such as:

/wp-content/plugins/wp-event-solution/.../...//.../...//wp-config.php

to read sensitive files outside the plugin directory.

Vulnerable vs. Patched Code

Vulnerable Code (<= 4.0.7):

$file = $_GET['file'];
$path = WP_CONTENT_DIR . '/uploads/' . $file;
if (file_exists($path)) {
    readfile($path);
}

This code directly concatenates user input without sanitization.

Patched Code (Hypothetical):

$file = basename($_GET['file']);
$path = realpath(WP_CONTENT_DIR . '/uploads/' . $file);
if (strpos($path, realpath(WP_CONTENT_DIR . '/uploads/')) === 0 && file_exists($path)) {
    readfile($path);
}

The patched version uses basename() to strip directory components and realpath() to resolve the full path, then checks that the resolved path starts with the allowed base directory.

Exploitation & Lab Setup

Red Team

1. Setup: Install WordPress with Eventin plugin version 4.0.7 on a local server.
2. Exploit: Send a crafted HTTP request to read sensitive files:

   GET /wp-content/plugins/wp-event-solution/.../...//.../...//wp-config.php HTTP/1.1
   Host: target.com
   

3. Verification: The response will contain the contents of wp-config.php if successful.

Blue Team

1. Detection: Monitor for requests containing .../...// or similar traversal patterns in web server logs.
2. Mitigation: Apply a Web Application Firewall (WAF) rule to block path traversal patterns.
3. Hunting: Search for unusual file access patterns in access logs, especially for files outside the web root.

Indicators of Compromise (IOCs)

• Network: HTTP requests with URI containing .../...// or %2e%2e%2f sequences.
• File System: Unexpected access to files like /etc/passwd, wp-config.php, or .env from the plugin directory.
• Logs: Web server logs showing 200 responses for requests to files outside the plugin directory.

Detection Engineering

YARA Rule

rule CVE_2024_56213_PathTraversal {
    meta:
        description = "Detects path traversal attempts targeting Eventin plugin"
        author = "Valters IT"
        date = "2025-04-10"
        reference = "CVE-2024-56213"
    strings:
        $traversal1 = ".../...//"
        $traversal2 = "..%2f..%2f"
        $traversal3 = "%2e%2e%2f%2e%2e%2f"
    condition:
        any of them
}

Sigma Rule

title: CVE-2024-56213 Path Traversal in Eventin Plugin
id: 7a8b9c0d-1e2f-3a4b-5c6d-7e8f9a0b1c2d
status: experimental
description: Detects path traversal attempts using .../...// pattern
logsource:
    category: webserver
    product: apache
detection:
    selection:
        cs-uri-query|contains: '.../...//'
    condition: selection
falsepositives:
    - Legitimate use of triple dots in filenames (rare)
level: high

Suricata Rule

alert http any any -> any any (msg:"CVE-2024-56213 Eventin Path Traversal"; flow:to_server,established; content:".../...//"; http_uri; classtype:attempted-recon; sid:1000001; rev:1;)

Remediation & Mitigation

1. Immediate: Disable the Eventin plugin until a patch is available.
2. Short-term: Implement a WAF rule to block .../...// and other traversal patterns.
3. Long-term: Update to a patched version once released by Themewinter.
4. Compensating Controls: Restrict file permissions on sensitive files (e.g., wp-config.php to 600).
5. Monitoring: Enable detailed logging and alert on path traversal attempts.

Valters IT
Securing Digital Frontiers