Control

The Industrial Control Systems Cyber Emergency Response Team (ICS-CERT) has published newer versions of two tools that can help administrators with securing industrial control systems: the Cyber Security Evaluation Tool (CSET), and a whitepaper on recommended practices for improving ICS cybersecurity with defense-in-depth strategies.

securing industrial control systems

While the former has received many update through the years (this newer version is v8.0), the whitepaper is a “modernized” version of a document that has been first released in 2009.

Both tools are offered for free, in the hope that they will be widely used.

Cyber Security Evaluation Tool

The Cyber Security Evaluation Tool is a desktop software tool that guides asset owners and operators through a step-by-step process to evaluate their industrial control system and information technology network security practices.

securing industrial control systems

It does so by asking questions about system components, architectures, operational policies and procedures, and so on. The questions will depend on which government and industry cybersecurity standards the operators want their systems to adhere to.

“When the questionnaires are completed, CSET provides a dashboard of charts showing areas of strength and weakness, as well as a prioritized list of recommendations for increasing the site’s cybersecurity posture. CSET includes solutions, common practices, compensating actions, and component enhancements or additions,” ICS-CERT explains.

The team also offers onsite training and guidance to asset owners (in the US) who might encounter problems while using CSET. This help also comes at no cost. For instructions on how to download and install the tool, go here.

The whitepaper

ICS-CERT works to reduce risks within and across all critical infrastructure sectors – chemical, emergency services, energy, critical manufacturing, healthcare, IT, transportation, and so on.

This newest report will be helpful for organizations in each of those sectors, and concentrates on defense-in-depth strategies and a holistic approach to security.

“The concept of Defense in Depth is not new — many organizations already employ many of the Defense-in-Depth measures discussed in this document within their information technology (IT) infrastructures; however, they do not necessarily apply it to their ICS operations,” the experts who penned the report noted.

“In the past, most organizations did not see a need to do so. Legacy ICSs used obscure protocols and were largely considered ‘hack proof’ because of their separation from IT and because of having physical protection measures in place. But with the convergence of IT and ICS architectures, recent high-profile intrusions have highlighted the potential risk to control systems.”

Another problem that the defense-in-depth approach can minimize is the fact that there is a distinct lack of ICS-specific security solutions.

The report includes an overview of the current state of ICS cybersecurity, ICS defense-in-depth strategies, an overview of possible attacks against critical infrastructures, and recommendations for securing ICS. The latter includes adopting a proactive security model, key security countermeasures, and a variety of available services and tools (CSET is among them).


Help Net Security

October will mark a major shift in the way Microsoft structures its Patch Tuesday release for many users and experts worry the new monthly Windows rollup will force companies to accept more risk in order to avoid compatibility issues.

Microsoft previously announced it would be changing the Patch Tuesday structure in October for Windows 7 and Windows 8.1 users to the so-called "Monthly Rollup." With this change, fewer patch bulletins will be bundled into separate update packages for Internet Explorer, the Windows platform and the .NET platform, removing the ability to pick and choose individual patches to apply. Microsoft claims this will create a simpler process and reduce update fragmentation.

The change is similar to the structure of patch updates for Windows 10, but according to Chris Goettl, product manager with Shavlik, the Windows rollup for older platforms will allow more flexibility for IT staff.

"Windows 10 has all updates in a cumulative bundle each month which is more strict than the servicing change being implemented on pre-Windows 10 systems next month.  At least on the earlier platforms, enterprises will be able to choose a security only bundle instead of the cumulative rollup for Internet Explorer and OS each month," Goettl told SearchSecurity. ".NET is also a separate rollup, unlike on Windows 10, so this change levels the field a bit but even with the change Windows 10 is still more restrictive."

Microsoft has had a mixed history with patch releases, requiring IT administrators to test patches to ensure there are no issues with compatibility and to ensure patches don't introduce new problems in software.

Tyler Reguly, manager of security research at Tripwire, pointed out that "administrators and security professionals have commented negatively on the Windows 10 model since it was released" and said the new Windows rollup for older platforms won't reduce the need for testing.

"Enterprises need to ensure they have large test labs setup with a full cross-section of their production environment available for testing as it is very unlikely that we'll see the remainder of the year pass without any negative interactions from these patches," Reguly told SearchSecurity.

However, Bobby Kuzma, system engineer at Core Security, said he isn't "terribly fond of forced updates without enterprise approval" such as those on Windows 10, where enterprises need to pay in order to have the option to delay patch installs, but Kuzma admitted there's "a huge hygiene and herd immunity benefit to enforcing updates automatically."

"Instead of having hundreds of possible combinations to test, they only need to test the one rollup. Being able to rely on consistent states of software deployment will help simplify troubleshooting, as well as reducing the vulnerability management burden," Kuzma told SearchSecurity. "Yes, there may be compatibility issues with certain applications, but I look at that largely as a vendor problem. One of the reasons that Microsoft has vulnerabilities that tend to crop up across multiple operating system versions is that they go to huge lengths to maintain compatibility, which often means porting buggy code from version to version because that's expected behavior."

But experts worry it will leave users with a choice of updating and risking compatibility issues or not updating at all. The Windows patch options for Windows 7 and 8.1 will allow users to delay a monthly rollup, but that rollup will stack on to the next month's package.

Goettl said the new structure could present more risk because while there will be fewer bulletins, there will be more CVEs per bulletin once the change is made.

"The bottom line here is exceptions due to application compatibility issues will become more compounded from a risk perspective. Companies will have to do more rigorous application compatibility testing to ensure things don't break when these larger bundled security updates are pushed to systems," Goettl said. "If there is a conflict, vendors that conflict with the updates are going to be under more pressure to resolve issues. Where companies may have accepted an exception for one or two vulnerabilities, an exception that causes 20 vulnerabilities to go unpatched will have a very different reaction."

Amol Sarwate, director of Vulnerability Labs at Qualys, Inc., said it may not be bad for everyone.

"Monthly rollup is a good idea for most users, as it removes the burden of keeping track of which patches are needed and which ones are installed. As every month's rollup supersedes the previous month's rollup, it should be easy to keep track of whether you are up-to-date," Sarwate said. "But the disadvantage of the all-or-nothing approach is that if one patch has a stability or usability issue then it cannot be selectively forbidden. Another point to note is that previously shipped patches will not be included in the October roll-up and will instead be eventually rolled up in the upcoming year or so. This may create more work in the short run for administrators to keep track of which past [knowledge base] is rolled up in each month's update."

Next Steps

Learn more about breaking bad patch management with Windows Update for Business.

Find out how crowdsourced vulnerability patching could save us all.

Get info on trading Microsoft Patch Tuesday for Windows Update for Business.


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Threatpost | The first stop for security news

Even password manager LastPass can be fooled. A Google security researcher has found a way to remotely hijack the software.

It works by first luring the user to a malicious site. The site will then exploit a flaw in a LastPass add-on for the Firefox browser, giving it control over the password management software.

[ Also on InfoWorld: 19 open source GitHub projects for security pros. | Discover how to secure your systems with InfoWorld's Security newsletter. ]

LastPass wrote about the vulnerability on Wednesday and said that a fix is already out for Firefox users.

Google security research Tavis Ormandy first discovered the issue. When examining the password manager, he tweeted on Tuesday, "Are people really using this lastpass thing? I took a quick look and can see a bunch of obvious critical problems. I'll send a report asap."

Any vulnerability with LastPass could pose a big risk for users. The popular software is supposed to securely store and autofill all the passwords users have for their different sites.

Ormandy isn't the only security researcher to find flaws with the password manager. On Wednesday, Mathias Karlsson at Detectify Labs said that he had also managed to hack LastPass -- in this case, to steal user passwords.

He did so by exploiting a bug in the password manager's Chrome browser extension, Karlsson
InfoWorld Security

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