CVE-2025-37159

Executive Summary

CVE-2025-37159 is a session hijacking vulnerability in the web management interface of HPE Aruba AOS-CX switches. An authenticated remote attacker can exploit this flaw to hijack an active user session, potentially gaining unauthorized access to sensitive configuration data. The vulnerability has a CVSS score of 5.8 (Medium), with low attack complexity and no user interaction required. No public proof-of-concept or exploit code has been released, and the patch status remains unknown. This report provides a comprehensive technical analysis, detection guidance, and mitigation recommendations.

Supply Chain & Package Security

This vulnerability is not related to NPM, PyPI, Go, or Ruby packages. It affects HPE Aruba AOS-CX network switches, which are hardware appliances. No supply chain package security implications are present.

CVSS Breakdown & Threat Level

• CVSS Score: 5.8 (Medium)
• Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N
• Attack Vector: Network (AV:N) – The vulnerability can be exploited remotely over the network.
• Attack Complexity: Low (AC:L) – No special conditions or complex attack sequences are required.
• Privileges Required: Low (PR:L) – The attacker must have valid credentials to authenticate to the web management interface.
• User Interaction: None (UI:N) – No user action is needed for exploitation.
• Scope: Unchanged (S:U) – The vulnerability does not affect other components.
• Confidentiality Impact: Low (C:L) – Limited access to sensitive configuration data.
• Integrity Impact: Low (I:L) – Potential modification of configuration data.
• Availability Impact: None (A:N) – No impact on system availability.

Threat Level: Medium. While the CVSS score is moderate, the ability to hijack an active session without user interaction makes this a significant concern for network administrators. The lack of a patch increases the risk.

Deep Dive & Mechanics

The vulnerability resides in the user authentication service of the AOS-CX web management interface. The exact mechanism is not publicly disclosed, but based on the description, it likely involves improper session token handling or insufficient validation of session identifiers.

Potential Attack Flow:

1. An attacker authenticates to the web management interface with valid credentials (e.g., a compromised or low-privileged account).
2. The attacker then exploits a flaw in the session management logic to hijack an active session of another user (e.g., an administrator).
3. Once hijacked, the attacker can perform actions with the privileges of the victim user, such as viewing or modifying switch configuration.

Root Cause Analysis:

• Weak Session ID Generation: The session tokens may be predictable or derived from easily guessable values.
• Session Fixation: The application may accept a session ID provided by the attacker, allowing them to force a victim to use a known session.
• Insufficient Session Binding: The session may not be properly bound to the user's IP address or other attributes, enabling reuse from different locations.

Vulnerable vs. Patched Code

No specific code snippets are available for this vulnerability. However, a typical vulnerable implementation might look like:

Vulnerable Code (Conceptual):

# Example of weak session ID generation
import random
session_id = str(random.randint(100000, 999999))  # Predictable

Patched Code (Conceptual):

# Example of secure session ID generation
import secrets
session_id = secrets.token_hex(32)  # Cryptographically random

In a real-world scenario, the patch would involve:

• Using cryptographically secure random number generators for session tokens.
• Implementing proper session expiration and rotation.
• Binding sessions to client IP addresses or other unique attributes.
• Validating session tokens against server-side storage.

Exploitation & Lab Setup

Red Team

Prerequisites:

• Valid credentials for the AOS-CX web management interface.
• Network access to the target switch.
• Knowledge of the victim's active session (e.g., session ID).

Exploitation Steps:

1. Reconnaissance: Identify active sessions by monitoring network traffic or using a session enumeration tool.
2. Session Hijacking: Use a tool like Burp Suite or a custom script to intercept and modify session cookies.
3. Maintain Access: Once hijacked, perform actions such as exporting configuration or modifying settings.

Example Command (Conceptual):

# Using curl to hijack a session (replace SESSION_ID with actual value)
curl -X GET https://target-switch/api/config \
  -H "Cookie: session_id=STOLEN_SESSION_ID"

Note: No public exploit code is available. This is a conceptual demonstration.

Blue Team

Detection Steps:

1. Monitor Session Activity: Look for multiple sessions from the same IP address or unusual session patterns.
2. Audit Logs: Review authentication logs for failed login attempts followed by successful session hijacking.
3. Network Traffic Analysis: Detect anomalies in HTTP headers or cookie usage.

Honeypot Setup:

• Deploy a decoy AOS-CX switch with monitoring to capture attacker behavior.
• Use tools like Cowrie or custom scripts to log all interactions.

Indicators of Compromise (IOCs)

• Network IOCs:

  • Unusual HTTP requests to /api/config or similar endpoints.
  • Multiple session IDs from the same IP address within a short time.
  • Session cookies with predictable patterns (e.g., sequential numbers).

• Host IOCs:

  • Unexpected changes to switch configuration (e.g., new VLANs, modified ACLs).
  • Log entries showing session creation from unusual IP addresses.
  • Presence of unauthorized SSH keys or accounts.

• File IOCs:

  • Modified configuration files (e.g., startup-config).
  • Unauthorized scripts or binaries in the switch filesystem.

Detection Engineering

YARA Rule

rule CVE_2025_37159_Session_Hijacking {
    meta:
        description = "Detects potential session hijacking attempts on AOS-CX web interface"
        author = "Valters IT"
        date = "2025-04-10"
        reference = "CVE-2025-37159"
    strings:
        $s1 = "session_id=" ascii wide nocase
        $s2 = "/api/config" ascii wide nocase
        $s3 = "HTTP/1.1 200" ascii wide
    condition:
        all of them
}

Sigma Rule

title: CVE-2025-37159 - AOS-CX Session Hijacking Attempt
id: 12345678-1234-1234-1234-123456789012
status: experimental
description: Detects potential session hijacking attempts against HPE Aruba AOS-CX switches
author: Valters IT
date: 2025-04-10
logsource:
    category: web
    product: hpe_aruba_aoscx
detection:
    selection:
        cs-method: 'GET'
        cs-uri-stem: '/api/config'
        sc-status: 200
    condition: selection
falsepositives:
    - Legitimate administrative actions
level: medium

Suricata Rule

alert http $HOME_NET any -> $EXTERNAL_NET any (
    msg:"CVE-2025-37159 - AOS-CX Session Hijacking Attempt";
    flow:to_server,established;
    content:"GET /api/config";
    http_method;
    content:"session_id=";
    http_cookie;
    sid:1000001;
    rev:1;
    reference:cve,2025-37159;
    classtype:attempted-user;
    priority:2;
)

Remediation & Mitigation

Immediate Actions:

1. Restrict Access: Limit web management interface access to trusted IP addresses using ACLs.
2. Enforce Strong Authentication: Use multi-factor authentication (MFA) for all administrative accounts.
3. Monitor Logs: Enable detailed logging and review for suspicious session activity.

Long-Term Fixes:

• Apply vendor patches as soon as they become available.
• Upgrade to a patched version of AOS-CX when released.
• Implement session timeout and rotation policies.

Workarounds:

• Disable the web management interface if not required, and use CLI or SNMP instead.
• Use VPN or jump hosts to access the management interface.

Valters IT
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