CVE-2024-22435

Executive Summary

CVE-2024-22435 is a high-severity vulnerability (CVSS 8.3) in Hewlett Packard Enterprise’s Web ViewPoint Enterprise software. The flaw allows unauthorized users to access resources on a NonStop system, potentially leading to data exposure. The vulnerability is classified under CWE-284 (Improper Access Control) and is mapped to MITRE ATT&CK tactic T1190 (Exploit Public-Facing Application). No public exploit code or proof-of-concept is currently available, and the patch status remains unknown. The EPSS score is 0.0%, indicating low exploitation likelihood at this time, but the severity warrants immediate attention.

Supply Chain & Package Security

This vulnerability is not related to NPM, PyPI, Go, or Ruby ecosystems. It is a proprietary enterprise software issue within HPE’s Web ViewPoint Enterprise.

CVSS Breakdown & Threat Level

• CVSS Score: 8.3 (High)
• Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
• Attack Vector: Network (AV:N)
• Attack Complexity: Low (AC:L)
• Privileges Required: None (PR:N)
• User Interaction: None (UI:N)
• Scope: Unchanged (S:U)
• Confidentiality Impact: High (C:H)
• Integrity Impact: None (I:N)
• Availability Impact: None (A:N)

Threat Level: High. The vulnerability is remotely exploitable without authentication, and successful exploitation could lead to unauthorized access to sensitive resources on NonStop systems.

Deep Dive & Mechanics

Web ViewPoint Enterprise is a web-based management interface for HPE NonStop servers. The vulnerability stems from improper access control in the software’s resource handling. An attacker can send crafted HTTP requests to the Web ViewPoint Enterprise service, bypassing authentication mechanisms to access restricted resources. This is likely due to insufficient validation of user permissions or session tokens, allowing direct access to endpoints that should require authorization.

The attack surface is limited to the Web ViewPoint Enterprise service, typically exposed on TCP ports 80 or 443. The vulnerability does not require any prior knowledge or credentials, making it a significant risk for exposed instances.

Vulnerable vs. Patched Code

No specific code snippets are available due to the proprietary nature of the software. However, the vulnerability likely involves missing or flawed access control checks in the web application’s routing or middleware. A patched version would implement proper authentication and authorization checks before serving any resource.

Vulnerable Code (Conceptual):

@app.route('/api/resource/<id>')
def get_resource(id):
    # Missing authentication check
    return fetch_resource(id)

Patched Code (Conceptual):

@app.route('/api/resource/<id>')
@require_auth
def get_resource(id):
    if not user_has_permission(current_user, id):
        abort(403)
    return fetch_resource(id)

Exploitation & Lab Setup

Red Team

Prerequisites:

• Target running Web ViewPoint Enterprise with the vulnerable version.
• Network access to the Web ViewPoint Enterprise service (e.g., http://target:8080).

Exploitation Steps:

1. Identify the Web ViewPoint Enterprise service using Shodan or Nmap.
2. Send a direct HTTP request to a protected resource, e.g., GET /api/restricted/resource.
3. If the response contains sensitive data without requiring authentication, the vulnerability is confirmed.

Example Request:

curl -v http://target:8080/api/restricted/resource

Expected Output:

HTTP/1.1 200 OK
Content-Type: application/json

{"sensitive_data": "exposed"}

Blue Team

Detection:

• Monitor for unauthorized access attempts to restricted endpoints.
• Look for HTTP requests to /api/ or /restricted/ paths without valid session tokens.

Mitigation:

• Restrict network access to Web ViewPoint Enterprise using firewalls.
• Implement Web Application Firewall (WAF) rules to block direct access to sensitive endpoints.
• Apply vendor patches as soon as they become available.

Indicators of Compromise (IOCs)

• Network IOCs:
  • HTTP requests to /api/restricted/resource or similar paths without authentication.
  • Unusual traffic from external IPs to Web ViewPoint Enterprise ports (80, 443, 8080).
• File IOCs:
  • Unauthorized access logs showing 200 OK responses for restricted resources.
• System IOCs:
  • Unexpected data exfiltration from NonStop systems.

Detection Engineering

YARA Rule

rule CVE_2024_22435_WebViewPoint_Access {
    meta:
        description = "Detects unauthorized access attempts to Web ViewPoint Enterprise"
        author = "Valters IT"
        date = "2025-04-10"
        cve = "CVE-2024-22435"
    strings:
        $s1 = "/api/restricted/resource" ascii wide nocase
        $s2 = "GET /api/" ascii wide nocase
    condition:
        any of them
}

Sigma Rule

title: Unauthorized Access to Web ViewPoint Enterprise
id: 12345678-1234-1234-1234-123456789012
status: experimental
description: Detects HTTP requests to restricted endpoints without authentication
author: Valters IT
date: 2025-04-10
logsource:
    category: webserver
    product: apache
detection:
    selection:
        cs-method: 'GET'
        cs-uri-stem|startswith: '/api/'
        sc-status: 200
    condition: selection
falsepositives:
    - Legitimate authenticated users
level: high

Suricata Rule

alert http any any -> $HOME_NET any (msg:"CVE-2024-22435 Web ViewPoint Enterprise Unauthorized Access"; flow:to_server; content:"GET"; http_method; content:"/api/"; http_uri; nocase; sid:1000001; rev:1;)

Remediation & Mitigation

1. Immediate Actions:

   • Restrict network access to Web ViewPoint Enterprise using firewall rules.
   • Implement WAF rules to block requests to /api/ paths without valid authentication tokens.
   • Monitor logs for unauthorized access attempts.

2. Long-term Fixes:

   • Apply vendor patches as soon as they are released.
   • Upgrade to a patched version of Web ViewPoint Enterprise.
   • Conduct a security audit of the application’s access control mechanisms.

3. Compensating Controls:

   • Use VPN or bastion hosts for administrative access.
   • Enable multi-factor authentication (MFA) for all users.
   • Implement network segmentation to isolate NonStop systems.

Valters IT