Credential cyber attacks are a major category of cyber threats that target digital and cyber-physical systems that rely on secure access to maintain control and visibility. In PV systems, where operators rely on remote monitoring platforms, SCADA interfaces and cloud-connected devices, compromised credentials can provide attackers with direct and permanent access to critical infrastructure.
These attacks include obtaining legitimate usernames and passwords through techniques such as phishing, brute-force attacks, credential stuffing, or exploiting weak authentication practices. Unlike denial-of-service attacks that overwhelm systems, credential attacks allow adversaries to impersonate authorized users, bypassing traditional security barriers. As a result, operators may be unaware that unauthorized access has been obtained.
Credential attacks can target PV systems and solar power plants by infiltrating monitoring platforms, inverter management interfaces, gateways or SCADA systems. Once inside, attackers can change system settings, disable protections, manipulate generation parameters, or interrupt communication flows. In some cases, attackers can achieve persistence and maintain long-term access without detection.
These attacks can also indirectly cause physical stress on system components such as inverters or transformers by changing control parameters or delaying fault responses. Furthermore, they can lead to reduced energy production, increased maintenance costs and safety risks for personnel who rely on inaccurate or manipulated data.
“Credential-based attacks are the number one reason for cyber intrusion. It’s really about the basics. If your password is weak, an AI might be able to guess it. And if you reuse the same password on different systems, once exposed, everything will fall like dominoes.” pv magazine.
Operational modes
Credential attacks can work in different ways depending on the attacker’s approach. Phishing-based attacks trick users into revealing credentials via fake login pages or malicious emails. Brute force and credential stuffing attacks attempt to systematically guess credentials, often using previously leaked credentials from other platforms. In more advanced scenarios, attackers can exploit weak authentication protocols or session management flaws to hijack active user sessions.
For PV systems, a credential attack often starts by attacking personnel such as operators, maintenance teams or administrators who have access to critical platforms. Attackers can send phishing emails or scan for exposed login portals connected to inverters, gateways or cloud-based monitoring systems. Once valid credentials are obtained, attackers can log in as legitimate users without arousing immediate suspicion.
Common techniques in PV environments include password reuse, lack of multi-factor authentication (MFA), and poorly secured remote access interfaces. In distributed solar farms, attackers can target centralized management platforms and gain access to multiple locations through a single compromised account.
Once the attack is underway, operators may notice unusual system behavior, unauthorized configuration changes, or unexplained data anomalies. However, in many cases, credential attacks go undetected for extended periods of time, allowing attackers to maintain control and expand their access to interconnected systems.
Defense
One possible defense against credential attacks in PV systems is to implement strong authentication mechanisms, including multi-factor authentication (MFA), which significantly reduces the risk of unauthorized access. Enforcing strong password policies and eliminating password reuse are also crucial steps in securing access points.
Identity and access management (IAM) systems can help by enforcing role-based access control so that users have only the permissions necessary for their tasks. This limits the potential impact of a compromised account. Additionally, continuous monitoring of login activity can help detect suspicious behavior, such as unusual login locations or repeated failed attempts.
Network segmentation can further reduce risk by isolating critical components such as inverters, SCADA systems and monitoring platforms, preventing attackers from moving laterally within the system after gaining access. However, if the authentication mechanisms at the access points remain weak, attackers can still infiltrate important systems.
Intrusion detection systems (IDSs) and Security Information and Event Management (SIEM) platforms can also help detect credential attacks by identifying anomalies in user behavior, access patterns, or system interactions. These tools provide early warnings, but must be combined with automated response mechanisms to effectively contain threats.
User awareness training is another essential layer of defense, helping staff recognize phishing attempts and follow secure login practices.
Continuous authentication
In summary, credential compromise attacks pose a serious risk to PV systems, particularly affecting their integrity, confidentiality and operational control. Unlike availability-targeted attacks, these threats allow attackers to directly manipulate system behavior while remaining undetected.
While measures such as MFA, strong password policies, access control, monitoring and user training can significantly reduce risk, no solution alone is sufficient. Systems should be designed for continuous authentication monitoring and rapid response capabilities.
This approach not only helps maintain secure system operations, but also limits the attacker’s ability to persist in the environment or expand their control over multiple assets.
“To secure the PV infrastructure against these attacks, you need to manage your remote access credentials the same way a bank account manages its vault keys. That may sound complicated, but it really isn’t. Use unique passwords for each access point and keep them hidden. Be sure to change them every now and then, and have an outsider perform penetration testing and ensure your protections hold up. If you are an asset owner without daily access to the exchanges, demand this level of professionalism from your O&M suppliers,” Sadot concluded.
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