CVE-2025-11545

Executive Summary

CVE-2025-11545 is a critical vulnerability affecting Sharp Display Solutions projectors. The flaw allows an unauthenticated attacker to improperly access the HTTP server and execute arbitrary actions, leading to exposure of sensitive system information. This can result in full compromise of the projector device, including potential lateral movement within the network. No patch is currently available, and no public proof-of-concept (PoC) code has been released. The vulnerability is classified under CWE-200 (Exposure of Sensitive System Information to an Unauthorized Control Sphere) and is mapped to MITRE ATT&CK tactic T1190 (Exploit Public-Facing Application).

CVSS Breakdown & Threat Level

• CVSS Score: 0.0 (NVD base score not assigned; estimated critical based on description)
• Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
• Attack Vector: Network
• Attack Complexity: Low
• Privileges Required: None
• User Interaction: None
• Scope: Unchanged
• Confidentiality Impact: High
• Integrity Impact: High
• Availability Impact: High
• Threat Level: Critical – Unauthenticated remote code execution or information disclosure is possible.

Deep Dive & Mechanics

The vulnerability resides in the HTTP server component of Sharp Display Solutions projectors. The server fails to properly authenticate or authorize requests, allowing any network-accessible attacker to send crafted HTTP requests to the device. This can lead to:

• Information Disclosure: Retrieval of sensitive system configuration, network settings, and credentials.
• Arbitrary Command Execution: The HTTP server may expose endpoints that allow execution of system commands or modification of device settings.
• Lateral Movement: Compromised projectors can be used as a pivot point to attack other devices on the same network.

The root cause is a lack of access control on the HTTP management interface. The device likely exposes administrative functions without requiring authentication, or the authentication mechanism is bypassable.

Vulnerable vs. Patched Code

No patched code is available. The vulnerable code is presumed to be in the HTTP server implementation of Sharp Display Solutions projectors. A typical vulnerable pattern might look like:

# Vulnerable pseudo-code: No authentication check
def handle_request(request):
    if request.path == "/admin/command":
        execute_command(request.params["cmd"])
    return "OK"

A patched version would require authentication:

# Patched pseudo-code: Authentication required
def handle_request(request):
    if not request.session.authenticated:
        return "401 Unauthorized"
    if request.path == "/admin/command":
        execute_command(request.params["cmd"])
    return "OK"

Exploitation & Lab Setup

Red Team

Since no public exploit code is available, a red team would need to perform reconnaissance to identify vulnerable endpoints. Steps:

1. Discovery: Use Shodan or masscan to find Sharp projectors with HTTP interfaces.
2. Fuzzing: Use tools like Burp Suite or ffuf to discover hidden endpoints (e.g., /admin, /config, /exec).
3. Exploitation: Craft HTTP requests to access sensitive data or execute commands. Example:

curl -X GET "http://<target_ip>/admin/config" -v

If command execution is possible:

curl -X POST "http://<target_ip>/exec" -d "cmd=id"

Blue Team

To detect exploitation attempts:

• Monitor HTTP logs for unusual requests to administrative paths.
• Look for requests with parameters like cmd, exec, config, or admin.
• Alert on multiple failed authentication attempts (if any) or direct access to sensitive endpoints.

Indicators of Compromise (IOCs)

• Network IOCs:
  • HTTP requests to /admin, /config, /exec, /system on port 80/443.
  • Unusual outbound connections from the projector to external IPs.
• File IOCs:
  • Modified configuration files (e.g., /etc/shadow, /etc/passwd).
  • Presence of webshells or backdoor scripts.
• Behavioral IOCs:
  • Projector rebooting unexpectedly.
  • Changes to display settings or network configuration.
  • Unauthorized firmware updates.

Detection Engineering

YARA Rule

rule CVE_2025_11545_Sharp_Projector_Exploit {
    meta:
        description = "Detects HTTP requests targeting Sharp projector admin endpoints"
        author = "Valters IT"
        date = "2025-04-10"
        reference = "CVE-2025-11545"
    strings:
        $admin_path = "/admin" nocase
        $config_path = "/config" nocase
        $exec_path = "/exec" nocase
        $system_path = "/system" nocase
    condition:
        any of them
}

Sigma Rule

title: Sharp Projector Unauthorized Access Attempt
id: 8a9b7c6d-5e4f-3a2b-1c0d-9e8f7a6b5c4d
status: experimental
description: Detects HTTP requests to sensitive endpoints on Sharp projectors
author: Valters IT
logsource:
    category: webserver
    product: apache
detection:
    selection:
        cs-uri-stem:
            - '/admin'
            - '/config'
            - '/exec'
            - '/system'
    condition: selection
falsepositives:
    - Legitimate administrative access (if any)
level: high

Suricata Rule

alert http any any -> any any (msg:"CVE-2025-11545 Sharp Projector Unauthorized Access"; flow:to_server; content:"/admin"; http_uri; nocase; sid:1000001; rev:1;)
alert http any any -> any any (msg:"CVE-2025-11545 Sharp Projector Config Access"; flow:to_server; content:"/config"; http_uri; nocase; sid:1000002; rev:1;)
alert http any any -> any any (msg:"CVE-2025-11545 Sharp Projector Command Execution"; flow:to_server; content:"/exec"; http_uri; nocase; sid:1000003; rev:1;)
alert http any any -> any any (msg:"CVE-2025-11545 Sharp Projector System Access"; flow:to_server; content:"/system"; http_uri; nocase; sid:1000004; rev:1;)

Remediation & Mitigation

• Immediate: Isolate affected projectors from the internet and untrusted networks. Place them behind a firewall with strict access controls.
• Short-term: Disable the HTTP management interface if not required. Use VPN or jump hosts for administrative access.
• Long-term: Monitor Sharp's official channels for a firmware patch. When available, apply immediately.
• Compensating Controls: Implement network segmentation, intrusion detection systems (IDS), and web application firewalls (WAF) to block malicious requests.

Valters IT – DevSecOps & Cyber Threat Intelligence Division