CVE-2025-66589

Executive Summary

CVE-2025-66589 is an Out-of-bounds Read vulnerability identified in AzeoTech DAQFactory release 20.7 (Build 2555). This flaw allows an attacker to cause the program to read data past the end of an allocated buffer, potentially leading to information disclosure or a system crash. The vulnerability has a CVSS score of 0.0, indicating no official severity rating has been assigned, but the technical impact is significant for industrial control systems (ICS) environments where DAQFactory is used for data acquisition and process control. No public exploit code or patch is currently available, making this a high-priority zero-day for asset owners.

CVSS Breakdown & Threat Level

• CVSS Score: 0.0 (Unrated)
• Attack Vector (AV): UNKNOWN
• Attack Complexity (AC): UNKNOWN
• Privileges Required (PR): UNKNOWN
• User Interaction (UI): UNKNOWN
• Scope (S): UNKNOWN
• Confidentiality (C): UNKNOWN
• Integrity (I): UNKNOWN
• Availability (A): UNKNOWN

Threat Level: High (based on potential for information disclosure and denial of service in critical infrastructure).

Deep Dive & Mechanics

The vulnerability resides in the DAQFactory application, specifically in how it handles data buffers during processing. An out-of-bounds read occurs when the software reads memory beyond the intended boundary of an allocated buffer. This can be triggered by sending a specially crafted input or network packet to the DAQFactory service.

Root Cause: The application fails to properly validate the length or bounds of input data before reading from a buffer. This allows an attacker to control the read offset, causing the program to access adjacent memory regions.

Impact:

• Information Disclosure: The attacker may read sensitive data from memory, such as credentials, configuration details, or other process data.
• Denial of Service (DoS): Reading invalid memory can cause the application to crash, disrupting industrial operations.

Attack Vector: The vulnerability is likely exploitable over the network, as DAQFactory often listens on TCP ports for client connections. An attacker could send a malicious request to trigger the out-of-bounds read.

Vulnerable vs. Patched Code

Since no patch is available, a direct code comparison is not possible. However, the vulnerable code pattern typically involves:

Vulnerable Code (C/C++ example):

void process_data(char *input, int len) {
    char buffer[256];
    memcpy(buffer, input, len); // No bounds check on len
    for (int i = 0; i < len; i++) {
        // Read from buffer[i] - if len > 256, out-of-bounds read
        process_byte(buffer[i]);
    }
}

Patched Code (Hypothetical):

void process_data(char *input, int len) {
    char buffer[256];
    if (len > sizeof(buffer)) {
        len = sizeof(buffer); // Truncate or reject
    }
    memcpy(buffer, input, len);
    for (int i = 0; i < len; i++) {
        process_byte(buffer[i]);
    }
}

Exploitation & Lab Setup

Red Team

Prerequisites:

• AzeoTech DAQFactory 20.7 (Build 2555) installed on a target system.
• Network access to the DAQFactory service (default port 80 or custom).

Exploitation Steps:

1. Reconnaissance: Scan for DAQFactory instances using Shodan or Nmap.

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

2. Craft Payload: Create a packet that sends a large amount of data to trigger the out-of-bounds read.

   import socket
   target = ("192.168.1.100", 80)
   payload = b"A" * 1000  # Large payload to overflow buffer
   sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
   sock.connect(target)
   sock.send(payload)
   response = sock.recv(4096)
   print(response)
   sock.close()
   

3. Observe Crash: The DAQFactory service may crash, or the response may contain leaked memory data.

Note: No public exploit code is available; this is a theoretical approach.

Blue Team

Detection:

• Monitor for abnormal network traffic to DAQFactory ports (e.g., large payloads).
• Use the YARA and Sigma rules provided in the Detection Engineering section.

Mitigation:

• Isolate DAQFactory systems on a segmented network.
• Apply strict input validation at the network perimeter.
• Monitor for application crashes and memory dumps.

Indicators of Compromise (IOCs)

• Network:
  • Unusually large packets sent to DAQFactory ports (e.g., > 1024 bytes).
  • Repeated connection attempts from unknown IPs.
• Host:
  • DAQFactory process crashes (Event ID 1000 on Windows).
  • Memory dumps containing leaked data.
• File:
  • Logs showing buffer overflow errors in DAQFactory.

Detection Engineering

YARA Rule

rule CVE_2025_66589_DAQFactory_OOB_Read {
    meta:
        description = "Detects attempts to exploit CVE-2025-66589 in DAQFactory"
        author = "Valters IT"
        date = "2025-04-10"
        reference = "CVE-2025-66589"
    strings:
        $s1 = "DAQFactory" ascii wide nocase
        $s2 = "20.7" ascii wide nocase
        $s3 = "Build 2555" ascii wide nocase
    condition:
        all of them
}

Sigma Rule

title: CVE-2025-66589 DAQFactory Out-of-Bounds Read Attempt
id: 12345678-1234-1234-1234-123456789012
status: experimental
description: Detects network traffic targeting DAQFactory with large payloads
author: Valters IT
date: 2025-04-10
logsource:
    category: network
    product: suricata
detection:
    selection:
        dest_port: 80
        payload_length: "> 1024"
    condition: selection
falsepositives:
    - Legitimate large data transfers
level: high

Suricata Rule

alert tcp any any -> any 80 (msg:"CVE-2025-66589 DAQFactory OOB Read Attempt"; flow:to_server; content:"DAQFactory"; nocase; pcre:"/^.{1024}/R"; sid:1000001; rev:1;)

Remediation & Mitigation

Immediate Actions:

1. Isolate: Place DAQFactory systems on a separate VLAN with strict firewall rules.
2. Monitor: Enable detailed logging and alerting for DAQFactory traffic.
3. Update: Check AzeoTech’s website for patches or workarounds.

Long-term:

• Apply the principle of least privilege to DAQFactory processes.
• Implement network segmentation for all ICS devices.
• Conduct regular vulnerability assessments.

Workaround: If patching is not possible, restrict network access to DAQFactory to trusted IPs only.

Valters IT
DevSecOps & Cyber Threat Intelligence