Michelle Eggers

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Mainframe is happening now!



While most people may imagine mainframe computers to be an antiquated world of massive machinery, tape spools, and limited possibilities, they actually receive widespread use today in 2024 as the backbone infrastructure that allows billions of financial transactions to occur daily on a global scale.



Government entities can store and retrieve sensitive data with extremely high reliability and almost nonexistent downtime, and other sectors like healthcare, insurance, and utilities can meet the speed of demand by processing multiple terabytes of data with incredible ease, and consistency.



Mainframe computers have a wonderfully rich history that spans decades, and as such there have been many groups over the years that bring practitioners, vendors, and resource owners together for collaboration. SHARE, with an inauguration year of 1955, is the oldest and most well-known of these organizations — if you work in mainframe, you know about SHARE! It began as the first IT Enterprise group ever to form within the United States and has been operating continuously since, through industry publications, annual conferences, trainings, and ongoing opportunities to connect.



I had the pleasure of attending this year’s SHARE Orlando 2024 where I learned about the state of mainframe security today and the in-demand skills needed to protect these critical systems. Here’s what I thought of my time at the event.







Mainframe Penetration Testing is a Scarce Skillset 



SHARE Orlando 2024 was the first time I had the opportunity to experience a mainframe event, and it was an excellent introduction to the mainframe community at large with representation from organizations worldwide occupying the mainframe space. NetSPI was the only US-based proactive security consulting firm present, and I found myself engaged in multiple conversations on mainframe security as it relates to new integrations with data lakes, analytics platform, blockchain, and AI.



Also under frequent discussion were developments in hosted cloud computing, quantum cryptography, web applications on mainframe, and mainframe ethical hacking in general. I realized during my time at SHARE that there are currently very few dedicated ethical hackers working in mainframe; the arena is in great need of this skillset, and I was deeply encouraged to continue building my individual mainframe knowledge while contributing to the development of our expanding Mainframe Penetration Testing service line here at NetSPI.















IBM z/OS is the Most Popular 



IBM z/OS is by far the most common operating system you will find in use on mainframe today, and I was intrigued by a product IBM recently released called WatsonX AI. It makes use of foundational models and generative AI to assist with code translation from COBOL to Java for increased interoperability, and also makes it possible for businesses to train and deploy custom AI capabilities across the enterprise environment while maintaining full control of the data they own.



I also learned so much at both talks given by Philip Young, NetSPI’s Mainframe Director. At his first talk, entitled “Hacking CICS Applications: New Attacks on Old Screens”, the collaborative nature of SHARE was seen in full force as he was met with a great deal of feedback from the audience throughout the duration of the presentation. The talk covered an introduction to hack3270, a tool used to assist in CICS application pentesting, and certainly made an impression on the crowd… especially vendors and developers who had some new things to consider regarding the security of their CICS environments.



Philip’s second talk, “No Longer a Myth: A Guide to Mainframe Buffer Overflows”, was also well-received by the audience. A specific attack that for years many believed to be impossible was brought to light with a clear demo on how exactly this vulnerability can take place and some tips on ways to safeguard against buffer overflows on mainframe.



Finally, a talk given by Mark Wilson on the threat of ransomware within the mainframe environment. It was eye-opening for me as I personally was not aware of the native capability mainframe has for encrypting massive amounts of stored data within mere seconds. The fact that terabytes of mission-critical data could be encrypted in less than 12 minutes was a strong call to action for mainframe practitioners and owners alike to be aggressive with MFA requirements and tracking user behavior analytics.







Mainframe Security Is Mission-Critical 



I have a soft spot for mission-critical operations, legacy systems, and critical infrastructure. More specifically, I have a deep and abiding passion for the security of systems like mainframe that are heavily relied upon that do not frequently gain mainstream attention in the cybersecurity space. If we are relying on these computers, we must continuously work to protect them! Though they have been around for many years, new integrations and developments mean we will be faced with new potential vulnerabilities. All an attacker needs is one weakness to prevail, and these are the situations I am here to identify and report for eradication.







Check Out These Free Resources to Expand Your Mainframe Security Education 



There are some great talks available online, Philip has a fantastic list up (here and here are a few) covering many topics from the hacker perspective. IBM also hosts a free training program called IBM Z Xplore with hands-on interactive modules for learning to navigate and maximize z/OS use, as well as a networking platform called New to Z for burgeoning talent within any organization utilizing mainframe technology.



Overall, the experience at SHARE is a must-attend for those involved with or even just deeply fascinated by the world of mainframe. There is no other gathering of people with such passion and drive dedicated to this field. I was very pleased with the new information I was able to acquire and am so thankful for the connections I made among professionals and peers within the mainframe community.



See NetSPI’s technical research on Mainframe Penetration Testing by reading Philip’s article on Enumerating Users on z/OS with LISTUSER.









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Most people rarely think about the systems that keep our world running. But every once in a while, it’s worth it to pause and reflect on the critical infrastructure that makes our society run smoothly. In this case, we‘re talking about the security of industrial control systems (ICS).  



When daily activities go as planned, everyone carries on, but if things go awry, what can be a bad day for IT applications can mean taking an entire system offline in the ICS arena. In some cases, this can be hazardous to human safety and potentially cause environmental disasters. In fact, there’s an entire conference dedicated to ICS — and we’ve got the inside scoop. 



NetSPI Security Consultant Michelle Eggers earned a scholarship from Dragos and SANS to attend the ICS Security Summit & Training 2023. The summit is a deep dive into the field of ICS security, creating the space to share ideas, methods, and techniques for safeguarding critical infrastructure. We caught up with Michelle to share her experience and recap educational takeaways, memorable moments, and why ICS security is an important field of focus.  







Q&A with Michelle Eggers on ICS Security Summit & Training 2023 



1. How would you summarize your experience at the SANS ICS Security Summit 2023? 



The SANS ICS Summit was a phenomenal opportunity to undergo a crash-course into many foundational aspects of Operational Technology (OT) and the current trends surrounding the technologies used to support critical infrastructure worldwide.  



I had the opportunity to sit in on the beta rollout of the new SANS ICS 310 course and took away many valuable insights, such as a comparative analysis on the ways in which ICS and IT security concerns are similar, and the areas in which they differ dramatically.  



Each talk during the summit provided relevant, actionable information for ICS asset owners and operators with recommendations for navigating the current threat landscape. As a note, ransomware is by far the biggest concern facing the field at this time. In short, the conference presented zero filler and instead focused on rich information directly applicable to real-world scenarios.











2. What did you find most interesting in terms of tools used to secure ICS? 



Tooling wise, testing OT systems can be very similar to other types of penetration testing. The differences lie within the implementation. For example, Industrial Control Systems are often built on decades-old legacy hardware that may not be equipped to manage an active scan. In fact, something like a Nessus scan could easily knock out an entire system.  



While this situation may be a bad day for IT applications, in the ICS arena, taking a system offline can be hazardous to human safety and in extreme situations could even lead to an environmental disaster or loss of life.  



Cybersecurity for IT systems is built upon the CIA Triad model: Confidentiality, Integrity, and Availability. When working with operational technology, confidentiality is not the top priority; safety and availability instead play a much more crucial role. The impact goes beyond the potential loss or compromise of data or dollars and extends to potentially catastrophic effects in real-time, physical scenarios.  







3. How did you get introduced to ICS security? 



I first encountered the topic of ICS Security when I began my initial cybersecurity educational journey. It was not a large focus area but was mentioned in passing for general awareness purposes. I recall hearing at the time that air-gapped systems protect much of operational technology, but during the summit I came to understand that many OT systems are in fact networked and if there is an “air-gap” in place it is often a logical and not a physical separation, which as we know presents an opportunity for attacks that target bypassing security controls such as a misconfigured firewall. 







4. What makes you passionate about ICS security? 



Most people across the globe rely daily upon manufactured products or foods, critical infrastructure services (like healthcare), or utilities such as water or power to survive. The only way to escape the need for what OT provides us would be to live completely off grid, growing our own food, creating our own medicine, and so on.  



While this sounds ideal to some, the reality is very few people are actually living this way in industrialized countries. Industrial Control Systems are a crucial component of our daily lives whether we acknowledge it or not, and keeping these systems secure is of the utmost importance. 







5. Do you have a vision for how you could merge your pentesting skillset with operational technology (OT)? 



Ah, the dream! I would love to merge my existing interests in OSINT, Social Engineering, Physical Pentesting, and my current work in Web Application Penetration Testing with OT Pentesting into a well-rounded Red Team role that would assist organizations in securing their most vital assets in a multi-tiered and comprehensive approach.  



As far as OT testing branching out from Web App testing, many industrial control systems have some form of network connectivity that incorporates human-machine interfaces, and these can often present very similar vulnerabilities to IT systems regarding the authentication process. If forged remote authentication can be achieved to a workstation in control of a real-world, physical process you’ve got a very serious problem at hand. 







6. What tips do you have for security professionals looking to learn more about ICS security?  



Resources abound. Everything from YouTube to a basic browser search can provide a solid starting point for a better understanding of Operational Technology. I would recommend reading about the Colonial Pipeline cyberattack, studying up on Stuxnet and the Ukraine power grid attacks, and investigating any other infrastructure attacks of interest to gain a general idea of the OT landscape and what’s at stake.  











While at the conference I also had the opportunity to chat with Robert M. Lee, SANS ICS Fellow, who has put together a wonderful blog providing a list of resources for those interested in growing their knowledge base on ICS Cybersecurity, “A Collection of Resources for Getting Started in ICS/SCADA Cybersecurity.” 



In addition, Dean Parsons has also released several free PDF resources on the subject, entitled “ICS Cybersecurity Field Manual” Volumes 1-3. These will also be available soon in a consolidated hardcopy edition as well. I managed to snag a signed first edition copy of his book at the Summit and it’s an excellent read, I wholeheartedly recommend adding it to any cybersecurity resource collection.  







If ICS security piques your interest, then you’ve got some reading to do! Connect with Michelle Eggers on LinkedIn for more OT insights and learn about NetSPI’s OT-centric offensive security services here.  

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Mainframe is happening now!



While most people may imagine mainframe computers to be an antiquated world of massive machinery, tape spools, and limited possibilities, they actually receive widespread use today in 2024 as the backbone infrastructure that allows billions of financial transactions to occur daily on a global scale.



Government entities can store and retrieve sensitive data with extremely high reliability and almost nonexistent downtime, and other sectors like healthcare, insurance, and utilities can meet the speed of demand by processing multiple terabytes of data with incredible ease, and consistency.



Mainframe computers have a wonderfully rich history that spans decades, and as such there have been many groups over the years that bring practitioners, vendors, and resource owners together for collaboration. SHARE, with an inauguration year of 1955, is the oldest and most well-known of these organizations — if you work in mainframe, you know about SHARE! It began as the first IT Enterprise group ever to form within the United States and has been operating continuously since, through industry publications, annual conferences, trainings, and ongoing opportunities to connect.



I had the pleasure of attending this year’s SHARE Orlando 2024 where I learned about the state of mainframe security today and the in-demand skills needed to protect these critical systems. Here’s what I thought of my time at the event.







Mainframe Penetration Testing is a Scarce Skillset 



SHARE Orlando 2024 was the first time I had the opportunity to experience a mainframe event, and it was an excellent introduction to the mainframe community at large with representation from organizations worldwide occupying the mainframe space. NetSPI was the only US-based proactive security consulting firm present, and I found myself engaged in multiple conversations on mainframe security as it relates to new integrations with data lakes, analytics platform, blockchain, and AI.



Also under frequent discussion were developments in hosted cloud computing, quantum cryptography, web applications on mainframe, and mainframe ethical hacking in general. I realized during my time at SHARE that there are currently very few dedicated ethical hackers working in mainframe; the arena is in great need of this skillset, and I was deeply encouraged to continue building my individual mainframe knowledge while contributing to the development of our expanding Mainframe Penetration Testing service line here at NetSPI.















IBM z/OS is the Most Popular 



IBM z/OS is by far the most common operating system you will find in use on mainframe today, and I was intrigued by a product IBM recently released called WatsonX AI. It makes use of foundational models and generative AI to assist with code translation from COBOL to Java for increased interoperability, and also makes it possible for businesses to train and deploy custom AI capabilities across the enterprise environment while maintaining full control of the data they own.



I also learned so much at both talks given by Philip Young, NetSPI’s Mainframe Director. At his first talk, entitled “Hacking CICS Applications: New Attacks on Old Screens”, the collaborative nature of SHARE was seen in full force as he was met with a great deal of feedback from the audience throughout the duration of the presentation. The talk covered an introduction to hack3270, a tool used to assist in CICS application pentesting, and certainly made an impression on the crowd… especially vendors and developers who had some new things to consider regarding the security of their CICS environments.



Philip’s second talk, “No Longer a Myth: A Guide to Mainframe Buffer Overflows”, was also well-received by the audience. A specific attack that for years many believed to be impossible was brought to light with a clear demo on how exactly this vulnerability can take place and some tips on ways to safeguard against buffer overflows on mainframe.



Finally, a talk given by Mark Wilson on the threat of ransomware within the mainframe environment. It was eye-opening for me as I personally was not aware of the native capability mainframe has for encrypting massive amounts of stored data within mere seconds. The fact that terabytes of mission-critical data could be encrypted in less than 12 minutes was a strong call to action for mainframe practitioners and owners alike to be aggressive with MFA requirements and tracking user behavior analytics.







Mainframe Security Is Mission-Critical 



I have a soft spot for mission-critical operations, legacy systems, and critical infrastructure. More specifically, I have a deep and abiding passion for the security of systems like mainframe that are heavily relied upon that do not frequently gain mainstream attention in the cybersecurity space. If we are relying on these computers, we must continuously work to protect them! Though they have been around for many years, new integrations and developments mean we will be faced with new potential vulnerabilities. All an attacker needs is one weakness to prevail, and these are the situations I am here to identify and report for eradication.







Check Out These Free Resources to Expand Your Mainframe Security Education 



There are some great talks available online, Philip has a fantastic list up (here and here are a few) covering many topics from the hacker perspective. IBM also hosts a free training program called IBM Z Xplore with hands-on interactive modules for learning to navigate and maximize z/OS use, as well as a networking platform called New to Z for burgeoning talent within any organization utilizing mainframe technology.



Overall, the experience at SHARE is a must-attend for those involved with or even just deeply fascinated by the world of mainframe. There is no other gathering of people with such passion and drive dedicated to this field. I was very pleased with the new information I was able to acquire and am so thankful for the connections I made among professionals and peers within the mainframe community.



See NetSPI’s technical research on Mainframe Penetration Testing by reading Philip’s article on Enumerating Users on z/OS with LISTUSER.









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Executive Blog Personnel Development

Mainframe Mania: Highlights from SHARE Orlando 2024 

Michelle Eggers

March 26, 2024

Executive Blog Personnel Development

Q&A with Michelle Eggers: An Inside Look at the SANS ICS Security Summit 2023

Michelle Eggers

May 9, 2023