CVE-2015-3973 in UMG
Summary
by MITRE
Janitza UMG 508, 509, 511, 604, and 605 devices improperly generate session tokens, which makes it easier for remote attackers to determine a PIN value via unspecified computations on session-token values.
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Analysis
by VulDB Data Team • 02/23/2018
The CVE-2015-3973 vulnerability affects Janitza power measurement devices including UMG 508, 509, 511, 604, and 605 models, representing a critical weakness in the authentication mechanism of these industrial control systems. These devices are commonly deployed in energy management and monitoring applications where secure access to power measurement data is essential for operational integrity and safety. The vulnerability stems from improper session token generation practices that fundamentally compromise the security of the device's authentication system, creating a pathway for unauthorized access through predictable or guessable PIN values.
The technical flaw manifests in the session token generation algorithm which fails to produce sufficiently random or cryptographically secure tokens. This weakness allows remote attackers to perform unspecified computations on session token values that ultimately reveal the associated PIN codes. The vulnerability directly relates to CWE-330, which addresses insufficient randomness in security tokens, and represents a significant deviation from established security best practices for authentication token generation. The predictable nature of these tokens creates a scenario where an attacker can systematically determine valid PIN values through mathematical analysis or pattern recognition of the generated session identifiers.
The operational impact of this vulnerability extends beyond simple unauthorized access to encompass potential operational technology disruption and security breaches within industrial environments. Attackers who successfully exploit this vulnerability can gain full administrative access to these power measurement devices, potentially leading to manipulation of critical energy data, disruption of monitoring systems, or even physical security compromises in facilities relying on these devices. The vulnerability affects devices that are often deployed in critical infrastructure environments where the integrity of power measurement data is paramount for operational safety and regulatory compliance. This weakness particularly concerns the ATT&CK technique T1078.004 which covers valid accounts and T1566.001 which involves credential access through social engineering or predictable credential generation.
Mitigation strategies for CVE-2015-3973 should prioritize immediate firmware updates from Janitza to address the underlying session token generation algorithm. Organizations should implement network segmentation to limit access to these devices to authorized personnel only, and establish robust monitoring for unusual authentication patterns or multiple failed login attempts. Additional security controls including network access control lists, secure remote access solutions, and regular security audits of industrial control systems should be implemented to reduce the attack surface. The vulnerability highlights the importance of adhering to security standards such as NIST SP 800-53 for authentication controls and the need for proper cryptographic implementation in industrial control systems. Organizations should also consider implementing intrusion detection systems specifically designed for industrial environments to detect anomalous behavior patterns that might indicate exploitation attempts against these devices.