CVE-2023-34995 in M-Bus SoftwarePack 900S
Summary
by MITRE • 07/07/2023
There are no requirements for setting a complex password for PiiGAB M-Bus, which could contribute to a successful brute force attack if the password is inline with recommended password guidelines.
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Analysis
by VulDB Data Team • 07/25/2023
The vulnerability described in CVE-2023-34995 pertains to PiiGAB M-Bus systems where insufficient password complexity requirements create a significant security weakness that directly impacts authentication mechanisms. This issue represents a critical failure in access control implementation, as the absence of mandatory complex password policies leaves systems susceptible to automated brute force attacks. The vulnerability falls under the broader category of weak authentication mechanisms that are frequently exploited by threat actors seeking unauthorized access to industrial control systems and smart metering infrastructure.
The technical flaw manifests in the lack of enforcement for password complexity requirements within the PiiGAB M-Bus authentication framework, which operates as part of the broader M-Bus (Meter Bus) communication protocol used extensively in smart metering and utility management systems. This weakness creates a direct pathway for attackers to systematically guess passwords using automated tools, particularly when users select simple or predictable passwords that do not meet recommended security standards. The vulnerability is classified under CWE-521 Weak Password Requirements, which specifically addresses the absence of proper password strength enforcement mechanisms. The operational impact extends beyond simple unauthorized access, as these systems often control critical infrastructure components including energy distribution networks, water management systems, and other utility services that require robust security controls.
The potential attack surface for this vulnerability is particularly concerning given the widespread deployment of PiiGAB M-Bus systems in critical infrastructure environments. Attackers leveraging brute force techniques can systematically test common password combinations, dictionary words, or sequential patterns that are commonly used by operators in industrial settings. This vulnerability aligns with ATT&CK technique T1110.003 for Brute Force: Password Guessing, and represents a classic example of how weak authentication controls can compromise entire systems. The impact on operational technology environments is severe, as successful exploitation could lead to unauthorized modification of meter readings, disruption of utility services, or even physical security breaches in connected infrastructure. Organizations relying on M-Bus systems for smart grid operations face heightened risk of cyber incidents that could affect public safety and critical service delivery.
Mitigation strategies should focus on implementing mandatory password complexity policies that enforce minimum length requirements, character variety, and regular password rotation schedules. Security controls should include account lockout mechanisms after failed authentication attempts, multi-factor authentication implementation, and regular security audits of authentication systems. The solution requires adherence to industry standards such as NIST Special Publication 800-63B for digital identity guidelines and ISO/IEC 27001 for information security management. Organizations must also establish monitoring procedures to detect and respond to brute force attack patterns, including implementing intrusion detection systems and configuring access control lists to limit administrative privileges. Additionally, regular security training for system administrators and operational personnel is essential to ensure awareness of password security best practices and the importance of maintaining strong authentication controls in industrial environments.