Chemical Focus
I
ndustrial security is not only a topic for technical implementation, but starts from security awareness across all layers of management and employees.
Security is an ongoing risk and must be continually managed through the lifecycles of any manufacturer.
n Software development security assessment (SDSA) to review the security lifecycle of the product n Communication robustness testing (CRT) to identify unknown vulnerabilities
ISASecure SSA is also a lifecycle- based approach designed to bring security in solutions by evaluating the security lifecycle as an extension of the product lifecycle. In the context of using security tools,
the system robustness testing (SRT) should provide the assurances that end users need regarding the solution and architecture of their plant. The SRT consists of: a vulnerability
identification test (VIT) to identify known vulnerabilities; CRT that is identical to EDSA-CRT; and network stress testing (NST) to see how a device/solution behaves under abnormal high loads.
In the past, many companies considered their automation systems to be immune from attack.
As an example, the VIT is a detailed description of how to configure a continuous monitoring vulnerability scanner and helps to conclude which
known vulnerabilities are present in a product or solution. Such a VIT scan can be performed periodically during development to be sure that no new vulnerabilities are present or introduced in the product (release). Siemens ProductCERT is currently
developing an appliance called SiESTA (Siemens Extensible Security Testing Appliance) to automate and simplify security testing within Siemens. SiESTA already has the ISASecure SSA VIT on board.
Taking action Firstly, a system should always be protected from unwelcome visitors accessing it. A strict user management procedure should be in place. Users and computers should follow the principle of minimal rights, which means users should be granted the minimum set of access rights to carry out their job properly. This means that if an individual’s account is hacked, only minimal information will be compromised. Moreover, it is recommended that a
single sign-on and password is given for each user to access everything they need. This limits the amount of information that can be misplaced, thus limiting the opportunity for a hacker to gain this information and use it to infiltrate a security system. Even if a system has the best user
access security, it is important to protect it from attack in case a hacker does manage to access the network. A network can be divided up into security zones known as secure architectures. Each component within a secure architecture has the same level of trust and all traffic into and out of an individual zone can be monitored. Additionally, a network can be divided up into demilitarised zones. Using firewalls, the network is split into segments that are separate from the process control network (PCN). These segments are then used to communicate data from the distributed control system to the outside world, meaning there is no direct connection between the PCN and anyone outside the building.
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