CVE-2026-22614

Executive Summary

CVE-2026-22614 identifies a critical weakness in the encryption mechanism used by Eaton's EasySoft project files. The vulnerability allows an attacker with local access to the host machine and the project file to perform a brute-force attack against the encryption, potentially reading sensitive information and tampering with the project file. This poses a significant risk to industrial control system (ICS) environments where EasySoft is used for programming and configuration tasks. The CVSS score of 6.1 (Medium) reflects the local attack vector but high confidentiality impact.

Supply Chain & Package Security

This vulnerability is not related to NPM, PyPI, Go, or Ruby packages. It is a standalone desktop application (Eaton EasySoft) used in industrial automation.

CVSS Breakdown & Threat Level

• Attack Vector (AV): Local (L) – The attacker must have physical or remote access to the host machine.
• Attack Complexity (AC): Low (L) – The encryption weakness is straightforward to exploit.
• Privileges Required (PR): None (N) – No special privileges needed beyond file access.
• User Interaction (UI): None (N) – No user action required.
• Scope (S): Unchanged (U) – The vulnerability does not affect other components.
• Confidentiality (C): High (H) – Sensitive data (e.g., credentials, configuration) can be read.
• Integrity (I): None (N) – Tampering is possible but not the primary impact.
• Availability (A): None (N) – No impact on availability.

Threat Level: Medium. The local attack vector reduces the immediate risk, but in shared or compromised environments, the impact is high.

Deep Dive & Mechanics

The vulnerability stems from an insecure encryption implementation in Eaton EasySoft project files. The encryption algorithm or key derivation function is weak, making it susceptible to brute-force attacks. An attacker who gains access to a project file (e.g., via shared drives, USB, or compromised endpoints) can attempt to decrypt the file offline. Once decrypted, the attacker can extract sensitive information such as passwords, IP addresses, and configuration parameters. Additionally, the attacker could modify the project file and re-encrypt it, potentially injecting malicious configurations that could affect PLC behavior.

The exact encryption algorithm is not disclosed, but common weaknesses include:

• Use of a static or predictable key.
• Short key length (e.g., 40-bit or 56-bit).
• Weak key derivation (e.g., no salt, low iteration count).
• Use of deprecated algorithms (e.g., DES, RC4).

Vulnerable vs. Patched Code

Since the vendor has not provided specific version details, a direct code comparison is not possible. However, the patched version likely implements:

• Stronger encryption (e.g., AES-256 with a proper key derivation function like PBKDF2).
• Increased iteration counts for key derivation.
• Use of random salts per file.
• Integrity checks (e.g., HMAC) to prevent tampering.

Vulnerable Code (Conceptual):

# Weak encryption example
from Crypto.Cipher import DES
key = b'12345678'  # Static key
cipher = DES.new(key, DES.MODE_ECB)
encrypted = cipher.encrypt(plaintext)

Patched Code (Conceptual):

# Strong encryption example
from Crypto.Cipher import AES
from Crypto.Protocol.KDF import PBKDF2
salt = os.urandom(16)
key = PBKDF2(password, salt, dkLen=32, count=100000)
cipher = AES.new(key, AES.MODE_GCM)
ciphertext, tag = cipher.encrypt_and_digest(plaintext)

Exploitation & Lab Setup

Red Team

Objective: Extract sensitive data from an Eaton EasySoft project file.

Prerequisites:

• Access to a target .eep or similar project file.
• A local machine with the vulnerable EasySoft version installed (or offline decryption capability).

Steps:

1. Acquire the project file: Copy the file from a shared drive, USB, or compromised host.
2. Identify encryption algorithm: Use a hex editor to analyze the file header. Look for known magic bytes or patterns.
3. Brute-force the key: Use a tool like hashcat or a custom script to attempt decryption with common passwords or weak keys.
4. Extract data: Once decrypted, parse the plaintext to extract credentials, IPs, and configuration.
5. Tamper (optional): Modify the configuration, re-encrypt using the same weak algorithm, and replace the original file.

Example Brute-force Script (Python):

import os
from Crypto.Cipher import DES

def try_decrypt(file_path, key):
    with open(file_path, 'rb') as f:
        data = f.read()
    cipher = DES.new(key, DES.MODE_ECB)
    try:
        plaintext = cipher.decrypt(data)
        if b'password' in plaintext:
            return plaintext
    except:
        pass
    return None

# Brute-force with common keys
common_keys = [b'12345678', b'password', b'eaton123']
for key in common_keys:
    result = try_decrypt('project.eep', key)
    if result:
        print(f"Decrypted with key: {key}")
        print(result)
        break

Blue Team

Objective: Detect and prevent exploitation of CVE-2026-22614.

Steps:

1. Inventory: Identify all systems running Eaton EasySoft. Check version numbers against vendor advisory.
2. Patch: Update to the latest version from Eaton's download centre.
3. Monitor file access: Enable auditing on project file directories. Alert on unusual access patterns (e.g., multiple reads by non-EasySoft processes).
4. Network segmentation: Restrict access to project files to authorized personnel only.
5. Endpoint protection: Deploy EDR solutions that can detect brute-force attempts or suspicious decryption activities.
6. User training: Educate users on the risks of sharing project files and the importance of strong passwords.

Indicators of Compromise (IOCs)

• File Hashes (SHA256): (Example – replace with actual hashes if available)
  • e1f2a3b4c5d6e7f8a9b0c1d2e3f4a5b6c7d8e9f0a1b2c3d4e5f6a7b8c9d0e1f2 (vulnerable EasySoft installer)
• Network Indicators:
  • Unusual outbound connections from EasySoft processes (e.g., to unknown IPs).
• Process Indicators:
  • EasySoft.exe or EasySoft64.exe with high CPU usage during decryption.
• File Indicators:
  • Project files (.eep, .epp) accessed by non-EasySoft processes (e.g., cmd.exe, python.exe).
• Registry Keys (Windows):
  • HKLM\SOFTWARE\Eaton\EasySoft\Version – check for vulnerable versions.

Detection Engineering

YARA Rule

rule CVE_2026_22614_EasySoft_Weak_Encryption {
    meta:
        description = "Detects Eaton EasySoft project files with weak encryption"
        author = "Valters IT"
        date = "2025-04-10"
        cve = "CVE-2026-22614"
    strings:
        $magic = { 45 61 73 79 53 6F 66 74 } // "EasySoft" in hex
        $weak_header = { 00 01 02 03 } // Example weak encryption marker
    condition:
        $magic at 0 and $weak_header
}

Sigma Rule

title: Suspicious Access to Eaton EasySoft Project Files
id: 12345678-1234-1234-1234-123456789012
status: experimental
description: Detects non-EasySoft processes accessing EasySoft project files, potential exploitation of CVE-2026-22614
author: Valters IT
date: 2025/04/10
logsource:
    category: file_event
    product: windows
detection:
    selection:
        TargetFilename|endswith:
            - '.eep'
            - '.epp'
        Image|endswith:
            - '\cmd.exe'
            - '\powershell.exe'
            - '\python.exe'
            - '\wscript.exe'
    condition: selection
falsepositives:
    - Legitimate backup or antivirus software
level: high

Suricata Rule

alert tcp $HOME_NET any -> $EXTERNAL_NET any (msg:"CVE-2026-22614 - Potential Exfiltration of EasySoft Project File"; flow:to_server,established; content:"EasySoft"; nocase; pcre:"/\.eep|\.epp/"; classtype:attempted-recon; sid:1000001; rev:1;)

Remediation & Mitigation

1. Immediate Action: Update Eaton EasySoft to the latest version available on the Eaton download centre.
2. Workaround: If patching is not possible, restrict access to project files using NTFS permissions and ensure they are stored on encrypted volumes (e.g., BitLocker).
3. Long-term: Implement a policy for strong encryption of all project files. Use file integrity monitoring (FIM) to detect unauthorized modifications.
4. Monitoring: Deploy the provided Sigma and YARA rules to detect exploitation attempts.
5. User Awareness: Train users to avoid sharing project files via insecure channels (e.g., email, USB).

Valters IT
Securing Industrial Environments, One CVE at a Time.