CVE-2025-27086

Executive Summary

CVE-2025-27086 is an authentication bypass vulnerability in the HPE Performance Cluster Manager (HPCM) GUI. This flaw could allow an unauthenticated attacker to gain unauthorized access to the HPCM web interface, potentially leading to full compromise of the HPC cluster management plane. The vulnerability is currently unpatched, and no public exploit code or proof-of-concept is available. The CVSS score is listed as 0.0, indicating incomplete scoring data, but the underlying weakness (CWE-306: Missing Authentication for Critical Function) is severe.

Supply Chain & Package Security

This vulnerability is not related to NPM, PyPI, Go, or Ruby packages. It is a proprietary software component of HPE Performance Cluster Manager.

CVSS Breakdown & Threat Level

The CVSS score is reported as 0.0, which is likely a placeholder or error. Based on the description and CWE, the actual severity is expected to be high. A reasonable CVSS vector would be:

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

• Attack Vector (AV): Network – The HPCM GUI is typically exposed on a network.
• Attack Complexity (AC): Low – No special conditions required.
• Privileges Required (PR): None – Authentication bypass means no prior access needed.
• User Interaction (UI): None – No user action required.
• Scope (S): Unchanged – The vulnerable component is the HPCM itself.
• Confidentiality (C): High – Full access to cluster management data.
• Integrity (I): High – Ability to modify cluster configurations.
• Availability (A): High – Potential to disrupt HPC operations.

Threat Level: Critical (9.8) – Unauthenticated remote compromise of a critical infrastructure component.

Deep Dive & Mechanics

The HPE Performance Cluster Manager (HPCM) is a management platform for high-performance computing clusters. The GUI component provides a web-based interface for administrators to monitor, configure, and manage cluster resources.

The vulnerability lies in the authentication mechanism of the HPCM GUI. An attacker can bypass the login process and directly access protected endpoints or resources. This is a classic Missing Authentication for Critical Function (CWE-306) flaw.

Potential Attack Vector:

1. The attacker identifies the HPCM GUI endpoint (e.g., https://<hpcm-server>:<port>/).
2. The attacker sends a crafted HTTP request that bypasses the authentication check, possibly by manipulating session tokens, exploiting a logic flaw in the authentication middleware, or accessing a direct object reference that does not enforce authentication.
3. Once authenticated, the attacker can perform any action available to an administrator, such as:
   • Viewing cluster node status and logs.
   • Modifying job schedules.
   • Deploying or removing software.
   • Accessing SSH keys or credentials stored in the management database.
   • Executing arbitrary commands on cluster nodes.

The lack of a patch and public exploit code suggests this is a zero-day or a recently disclosed vulnerability with limited information.

Vulnerable vs. Patched Code

No code samples are available for this vulnerability. The vulnerable code is within the HPCM GUI authentication module. A patched version would enforce authentication checks on all sensitive endpoints, likely by implementing a robust middleware that validates session tokens or credentials before processing any request.

Hypothetical vulnerable code (pseudo):

# Vulnerable: No authentication check on /api/cluster/status
@app.route('/api/cluster/status')
def get_cluster_status():
    return jsonify(cluster_data)

Hypothetical patched code (pseudo):

# Patched: Authentication required
@app.route('/api/cluster/status')
@require_authentication
def get_cluster_status():
    return jsonify(cluster_data)

Exploitation & Lab Setup

Red Team

Since no public exploit code exists, a red team would need to perform manual analysis. The following steps outline a potential exploitation approach:

1. Reconnaissance: Identify HPCM GUI instances using Shodan dorks or network scanning.
2. Endpoint Discovery: Use tools like Burp Suite or ffuf to enumerate endpoints and identify those that do not require authentication.
3. Authentication Bypass Testing:
   • Try common bypass techniques: SQL injection in login fields, directory traversal, session token manipulation (e.g., setting admin=true in cookies), or accessing /admin directly.
   • Test for insecure direct object references (IDOR) that skip authentication.
4. Exploitation: Once a bypass is found, use the access to extract sensitive data or execute commands.

Lab Setup:

• Deploy a test instance of HPE Performance Cluster Manager (if available) in an isolated environment.
• Use a web proxy (Burp Suite) to intercept and modify requests.
• Use Python scripts to automate testing of authentication bypass vectors.

Example Python script for testing:

import requests

target = "https://hpcm-target:8080"
endpoints = ["/api/cluster/status", "/admin", "/config", "/api/jobs"]

for endpoint in endpoints:
    r = requests.get(target + endpoint, verify=False)
    if r.status_code == 200 and "login" not in r.text.lower():
        print(f"[+] Potential bypass at {endpoint}")

Blue Team

Detection:

• Monitor for unusual HTTP requests to HPCM GUI endpoints that do not include valid session tokens.
• Look for repeated attempts to access /admin, /api, or other sensitive paths without prior login.
• Alert on any successful access to administrative functions from IP addresses not in the allowed management network.

Hunting:

• Search web server logs for requests to HPCM GUI with HTTP status codes 200 but no corresponding login event.
• Correlate with authentication logs to identify sessions that were not properly established.

Indicators of Compromise (IOCs)

• Network IOCs:
  • Unusual HTTP requests to HPCM GUI endpoints (e.g., /api/cluster/status, /admin) from external IPs.
  • Multiple failed login attempts followed by a successful 200 response on a sensitive endpoint.
• File IOCs:
  • Modified HPCM configuration files (e.g., hpcm.conf, web.xml).
  • New user accounts or SSH keys added to the HPCM system.
• Log IOCs:
  • Web server logs showing access to protected resources without a preceding authentication event.
  • HPCM audit logs showing actions performed by an unknown or unauthorized user.

Detection Engineering

YARA Rule

rule CVE_2025_27086_HPCM_AuthBypass {
    meta:
        description = "Detects potential exploitation of CVE-2025-27086 in HPE HPCM logs"
        author = "Valters IT"
        date = "2025-04-10"
        reference = "CVE-2025-27086"
    strings:
        $s1 = "/api/cluster/status" nocase
        $s2 = "/admin" nocase
        $s3 = "HTTP/1.1\" 200" nocase
        $s4 = "GET /" nocase
    condition:
        all of ($s1, $s2, $s3, $s4) and #s3 > 5
}

Sigma Rule

title: CVE-2025-27086 HPCM Authentication Bypass
id: 8a4b3c2d-1e5f-4a7b-9c8d-0e1f2a3b4c5d
status: experimental
description: Detects potential exploitation of CVE-2025-27086 in HPE HPCM GUI
author: Valters IT
date: 2025-04-10
logsource:
    category: webserver
    product: apache
detection:
    selection:
        cs-uri-query|contains:
            - '/api/cluster/status'
            - '/admin'
            - '/config'
        sc-status: 200
    condition: selection
falsepositives:
    - Legitimate admin access from trusted IPs
level: high

Suricata Rule

alert http any any -> $HOME_NET any (
    msg:"CVE-2025-27086 HPCM Authentication Bypass Attempt";
    flow:to_server,established;
    content:"GET"; http_method;
    content:"/api/cluster/status"; http_uri;
    content:"/admin"; http_uri;
    classtype:attempted-admin;
    sid:1000001;
    rev:1;
)

Remediation & Mitigation

Immediate Actions:

1. Isolate HPCM GUI: Restrict network access to the HPCM GUI to only trusted management networks using firewalls or VPNs.
2. Monitor Logs: Enable detailed logging on the HPCM web server and monitor for suspicious activity.
3. Apply Workarounds: If possible, disable the GUI component and use CLI-only management until a patch is available.

Long-Term Fix:

• HPE must release a security patch that implements proper authentication checks on all GUI endpoints.
• Implement multi-factor authentication (MFA) for HPCM GUI access.
• Conduct a security audit of the HPCM codebase to identify similar flaws.

Valters IT Signature

This report was generated by Valters IT DevSecOps AI. For questions, contact security@valters-it.com.