Description

Insufficiently protected credentials issue exists in Remote I/O Coupler Unit (Server Type) CPSN-MCB271-*. If this vulnerability is exploited, sensitive information may be restored from a backup file.

Executive Summary

Technical Details

Mitigations

References

Additional Metadata

{
  "score": "6.3",
  "pubDate": "2026-09-14T07:17:20.510Z",
  "pubdate": "2026-09-14T07:17:20.510Z",
  "executiveSummary": "The Remote I/O Coupler Unit (Server Type) CPSN-MCB271-* is susceptible to an insufficient protection of credentials vulnerability.\nThis flaw allows unauthorized access to sensitive information stored within backup files generated by the device.\nThe vulnerability pertains to the lack of adequate encryption or obfuscation mechanisms applied to sensitive data during the backup process.\nSuccessful exploitation enables an attacker with access to the backup file to extract sensitive credentials, potentially leading to unauthorized device configuration changes, lateral movement within the operational network, or full system compromise.\nThe risk is particularly high in industrial environments where these units serve as critical communication interfaces.\nThe exploitation requirement is limited to gaining access to the backup file, which may be stored on removable media, network shares, or via an insecure management interface.\nGiven the nature of the device, compromised credentials often provide high-level administrative access to the underlying firmware or the broader industrial control system (ICS) infrastructure.",
  "technicalDetails": "The vulnerability resides within the backup functionality of the CPSN-MCB271-* Remote I/O Coupler Unit. The root cause is the implementation of inadequate security controls for protecting sensitive credentials during the generation and storage of backup configurations.\nSpecifically, when a system backup is initiated, the device exports its configuration, which includes sensitive authentication material. Investigation indicates that this data is either stored in plaintext or protected by an insufficient obfuscation scheme that is easily reversible by an attacker.\nThe attack flow commences with the actor obtaining a copy of the backup file. Depending on the environment, this may be achieved via unauthorized access to a management workstation where backups are archived, interception of backup transfers across the network, or physical access to storage media used for backups.\nUpon acquiring the backup file, the attacker parses the file structure to identify the segments containing credential data. Due to the lack of robust encryption—such as AES-256 with strong key management—the attacker can apply standard decryption or de-obfuscation techniques to retrieve the sensitive credentials.\nThe vulnerable component is the internal routine responsible for serializing system state and credentials into the backup archive. Because the CPSN-MCB271-* serves as a coupler unit, these credentials often include administrative passwords, network access keys, or communication parameters necessary for interaction with higher-level Supervisory Control and Data Acquisition (SCADA) systems.\nOnce credentials are extracted, the attacker can leverage these to impersonate legitimate users or system processes. The post-exploitation impact includes the potential for persistent unauthorized access, the ability to modify I/O logic, intercepting sensor data, or launching further attacks against the industrial network that relies on the CPSN-MCB271-* for connectivity.\nThe vulnerability does not require active exploitation of a live service; rather, it is a static vulnerability where the backup file itself acts as a source of compromise. This poses a significant challenge as backups are often considered 'trusted' assets and may lack the scrutiny applied to active network traffic."
}