CVE-2024-10260

Executive Summary

CVE-2024-10260 is a Stored Cross-Site Scripting (XSS) vulnerability in the Tripetto WordPress plugin, affecting all versions up to and including 8.0.11. The flaw resides in insufficient input sanitization and output escaping during file uploads, allowing unauthenticated attackers to inject arbitrary web scripts. When a user accesses the uploaded file, the malicious script executes in their browser, potentially leading to session hijacking, credential theft, or defacement. The vulnerability has a CVSS score of 7.2 (High) and an EPSS score of 0.0%, indicating low exploitation likelihood at this time. No public exploit code or patch details are available.

Supply Chain & Package Security

This vulnerability affects the Tripetto WordPress plugin, which is distributed through the WordPress plugin repository and potentially third-party marketplaces. Organizations using this plugin should verify their version and apply any available updates immediately. Since the patch status is unknown, users should consider disabling the plugin until a fix is released.

CVSS Breakdown & Threat Level

• CVSS Score: 7.2 (High)
• Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
• Attack Vector: Network
• Attack Complexity: Low
• Privileges Required: None
• User Interaction: Required (victim must access the uploaded file)
• Scope: Changed
• Confidentiality Impact: Low
• Integrity Impact: Low
• Availability Impact: None

The threat level is High due to the low complexity and network-based attack vector, though user interaction is required.

Deep Dive & Mechanics

The Tripetto plugin allows file uploads through its forms. The vulnerability arises because the plugin does not properly sanitize uploaded file names or contents, nor does it escape output when rendering file information. An unauthenticated attacker can upload a file containing malicious JavaScript (e.g., an HTML file or an image with embedded script). When the file is accessed or displayed, the script executes in the context of the victim's browser.

The attack flow:

1. Attacker identifies a Tripetto form with file upload capability.
2. Attacker uploads a file with a crafted name or content containing XSS payload (e.g., <script>alert('XSS')</script>).
3. The file is stored on the server.
4. Victim accesses the file (e.g., via a direct link or through the plugin's interface).
5. The malicious script executes, stealing cookies, redirecting, or performing other actions.

Vulnerable vs. Patched Code

Since no patch is available, a comparison cannot be made. However, the vulnerable code likely lacks proper validation and escaping. A patched version would include:

• Sanitization of file names (e.g., removing special characters).
• Validation of file content (e.g., checking MIME type and magic bytes).
• Escaping output when displaying file names or metadata (e.g., using esc_html() or esc_attr() in WordPress).

Exploitation & Lab Setup

Red Team

Prerequisites:

• A WordPress instance with Tripetto plugin version <= 8.0.11.
• A form with file upload enabled.

Steps:

1. Identify the upload endpoint (e.g., /wp-admin/admin-ajax.php?action=tripetto_upload).
2. Craft a malicious file (e.g., xss.html containing <script>alert(document.cookie)</script>).
3. Upload the file using a POST request:

   curl -X POST -F "file=@xss.html" -F "action=tripetto_upload" http://target/wp-admin/admin-ajax.php
   

4. Retrieve the file URL from the response.
5. Send the link to the victim (e.g., via phishing email).

Blue Team

Detection:

• Monitor file upload endpoints for unusual file types (e.g., HTML, SVG, JS).
• Check for files with double extensions or suspicious names.
• Use WAF rules to block uploads of script files.

Hunting:

• Search for uploaded files containing <script> tags or event handlers.
• Review server logs for POST requests to tripetto_upload with non-image MIME types.

Indicators of Compromise (IOCs)

• File Names: Files with extensions like .html, .svg, .js, or double extensions (e.g., image.jpg.html).
• File Content: Presence of <script>, onerror=, onload=, or other XSS vectors.
• URL Patterns: /wp-admin/admin-ajax.php?action=tripetto_upload
• Network Traffic: POST requests with Content-Type: multipart/form-data to the above endpoint.

Detection Engineering

YARA Rule

rule tripetto_xss_upload {
    meta:
        description = "Detects malicious file uploads targeting Tripetto XSS vulnerability"
        author = "Valters IT"
        date = "2024-10-25"
        reference = "CVE-2024-10260"
    strings:
        $xss1 = /<script[^>]*>/i
        $xss2 = /onerror\s*=/i
        $xss3 = /onload\s*=/i
        $xss4 = /javascript\s*:/i
    condition:
        any of ($xss*) and filesize < 1MB
}

Sigma Rule

title: Tripetto File Upload XSS Attempt
id: 8f3a2b1c-4d5e-6f7a-8b9c-0d1e2f3a4b5c
status: experimental
description: Detects attempts to exploit CVE-2024-10260 via file upload
author: Valters IT
date: 2024-10-25
logsource:
    category: webserver
    product: apache
detection:
    selection:
        cs-method: 'POST'
        cs-uri-query|contains: 'action=tripetto_upload'
        sc-status: 200
    condition: selection
falsepositives:
    - Legitimate file uploads by administrators
level: high

Suricata Rule

alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"CVE-2024-10260 Tripetto XSS File Upload"; flow:to_server,established; content:"POST"; http_method; content:"action=tripetto_upload"; http_client_body; pcre:"/<script[^>]*>/i"; sid:1000001; rev:1;)

Remediation & Mitigation

Immediate Actions:

1. Disable the Tripetto plugin until a patch is released.
2. Restrict file uploads to trusted users only (if disabling is not possible).
3. Implement a Web Application Firewall (WAF) rule to block script file uploads.

Long-term Fix:

• Apply the official patch once available (monitor Tripetto's update channel).
• Conduct a security audit of the plugin's file handling code.
• Educate users about the risks of accessing uploaded files from untrusted sources.

Workarounds:

• Use a security plugin (e.g., Wordfence) to block malicious file uploads.
• Configure server to prevent execution of uploaded script files (e.g., disable PHP execution in upload directories).

Valters IT