CVE-2024-50689

Executive Summary

CVE-2024-50689 is an Insecure Direct Object Reference (IDOR) vulnerability in SunGrow iSolarCloud, a cloud-based solar energy management platform. The flaw exists in the orgService API model, allowing an authenticated attacker to manipulate object references (e.g., organization IDs, user IDs, or device serials) to access or modify data belonging to other organizations or users without proper authorization. This can lead to unauthorized access to sensitive operational data, configuration tampering, and potential disruption of solar energy systems.

The vulnerability was remediated by the vendor on October 31, 2024, but no specific patch version or commit hash has been publicly disclosed. No public proof-of-concept (PoC) or exploit code is available at this time.

Supply Chain & Package Security

This vulnerability is not related to an open-source package (NPM, PyPI, Go, Ruby). It affects a proprietary cloud platform (iSolarCloud) and its backend API. Supply chain risk is limited to the vendor’s software development lifecycle and third-party integrations.

CVSS Breakdown & Threat Level

The CVSS score is listed as 0.0, indicating insufficient data for scoring. However, based on the vulnerability type (IDOR) and the context (cloud-based energy management), a reasonable estimated score would be:

• Attack Vector (AV): Network (N) – Exploitable over the internet.
• Attack Complexity (AC): Low (L) – Requires only knowledge of API endpoints and valid authentication.
• Privileges Required (PR): Low (L) – Attacker needs a valid user account.
• User Interaction (UI): None (N) – No victim interaction required.
• Scope (S): Changed (C) – The vulnerable component (API) impacts resources beyond its authorization boundary.
• Confidentiality (C): High (H) – Can access other organizations’ sensitive data.
• Integrity (I): High (H) – Can modify configurations or data.
• Availability (A): Low (L) – Could disrupt service by altering settings.

Estimated CVSS Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:L
Estimated Score: 9.0 (Critical)

Threat Level: Critical – Exploitation could lead to widespread data breaches and operational disruption in solar energy infrastructure.

Deep Dive & Mechanics

The orgService API model in iSolarCloud handles organization-level operations such as user management, device assignment, and data retrieval. The IDOR vulnerability arises because the API does not properly validate that the authenticated user has permission to access the resource identified by the object reference (e.g., orgId, userId, deviceId).

Mechanism:

1. An authenticated user sends a request to an endpoint like /api/orgService/getOrgDetails?orgId=12345.
2. The server retrieves and returns data for organization ID 12345 without checking if the requesting user belongs to that organization.
3. An attacker can enumerate or guess organization IDs to access data from other organizations.

Potential Impact:

• Access to other organizations’ solar panel production data, customer PII, and billing information.
• Modification of device configurations (e.g., inverter settings) leading to energy loss or equipment damage.
• Privilege escalation by manipulating user roles within an organization.

Vulnerable vs. Patched Code

No specific code snippets are available. The vulnerability is in the server-side API logic. The patch likely involves adding authorization checks before processing requests.

Vulnerable (Conceptual):

@app.route('/api/orgService/getOrgDetails')
def get_org_details():
    org_id = request.args.get('orgId')
    # Missing authorization check
    org_data = db.query("SELECT * FROM organizations WHERE id = ?", org_id)
    return jsonify(org_data)

Patched (Conceptual):

@app.route('/api/orgService/getOrgDetails')
def get_org_details():
    org_id = request.args.get('orgId')
    user_id = get_current_user_id()
    # Authorization check
    if not user_belongs_to_org(user_id, org_id):
        return jsonify({"error": "Unauthorized"}), 403
    org_data = db.query("SELECT * FROM organizations WHERE id = ?", org_id)
    return jsonify(org_data)

Exploitation & Lab Setup

Red Team (Exploitation)

Prerequisites:

• Valid user credentials for iSolarCloud.
• Knowledge of API endpoints (e.g., from API documentation or traffic analysis).

Steps:

1. Authenticate and obtain a session token.
2. Intercept API requests using a proxy (e.g., Burp Suite).
3. Identify endpoints that use object references (e.g., orgId, userId).
4. Modify the object reference in the request (e.g., change orgId=100 to orgId=101).
5. Observe if the response returns data for the unauthorized organization.

Example Request:

GET /api/orgService/getOrgDetails?orgId=101 HTTP/1.1
Host: isolarcloud.example.com
Authorization: Bearer <valid_token>

Expected Response (Vulnerable):

{
  "orgId": 101,
  "name": "Competitor Solar Inc.",
  "users": [...],
  "devices": [...]
}

Blue Team (Detection & Defense)

Detection:

• Monitor API logs for requests where the object reference in the response does not match the authenticated user’s authorized scope.
• Alert on repeated attempts to access different organization IDs from the same user.

Defense:

• Implement strict authorization checks on all API endpoints.
• Use parameterized queries to prevent injection.
• Apply rate limiting on API requests.
• Conduct regular security audits and penetration testing.

Indicators of Compromise (IOCs)

• Network IOCs:
  • Unusual API requests to /api/orgService/ endpoints with varying orgId, userId, or deviceId parameters.
  • High volume of 403 Forbidden responses followed by 200 OK from the same user.
• Log IOCs:
  • Log entries showing access to resources outside the user’s organization.
  • Repeated failed authorization attempts (if patched).
• File IOCs:
  • No specific file-based IOCs.

Detection Engineering

YARA Rule

rule CVE_2024_50689_IDOR_Detection {
    meta:
        description = "Detects potential IDOR exploitation attempts against SunGrow iSolarCloud orgService API"
        author = "Valters IT"
        date = "2024-11-01"
        reference = "CVE-2024-50689"
    strings:
        $api_path = "/api/orgService/"
        $param_org = "orgId="
        $param_user = "userId="
        $param_device = "deviceId="
    condition:
        any of ($api_path) and any of ($param_org, $param_user, $param_device)
}

Sigma Rule

title: SunGrow iSolarCloud IDOR Exploitation Attempt
id: 12345678-1234-1234-1234-123456789012
status: experimental
description: Detects potential IDOR exploitation against SunGrow iSolarCloud orgService API
author: Valters IT
date: 2024/11/01
references:
    - https://nvd.nist.gov/vuln/detail/CVE-2024-50689
logsource:
    category: webserver
    product: apache
    service: access_combined
detection:
    selection:
        cs-uri-query|contains:
            - "/api/orgService/"
            - "orgId="
            - "userId="
            - "deviceId="
    condition: selection
falsepositives:
    - Legitimate API usage by authorized users
level: high

Suricata Rule

alert http $HOME_NET any -> $EXTERNAL_NET any (
    msg:"CVE-2024-50689 SunGrow iSolarCloud IDOR Exploitation Attempt";
    flow:to_server,established;
    content:"/api/orgService/"; http_uri;
    content:"orgId="; http_uri;
    classtype:attempted-recon;
    sid:1000001;
    rev:1;
)

Remediation & Mitigation

Immediate Actions:

1. Apply the vendor’s October 31, 2024 remediation (contact SunGrow support if patch is not automatically applied).
2. Review API access logs for signs of exploitation.
3. Rotate all API keys and user credentials.

Long-term Mitigations:

• Implement robust authorization checks (e.g., using OAuth scopes or RBAC).
• Conduct regular security assessments of API endpoints.
• Deploy a Web Application Firewall (WAF) with rules to detect IDOR patterns.
• Educate developers on secure API design principles.

Workarounds:

• If patching is not immediately possible, restrict network access to the iSolarCloud API to trusted IPs only.
• Monitor and alert on anomalous API usage.

Valters IT