Tag Archive for: Vulnerability Scan

“Is that what you’re going to say to the auditor?”

Today’s tale from the trench is brought to you by Brad Schwab, Senior Security Solutions Consultant.


In the high-stakes world of security operations, one question looms larger than most: Are you sure you’re scanning the entire network? It seems straightforward, but for any team dealing with a network of significant scale, answering this question can be a daunting task.

During a pivotal meeting with stakeholders of a large health organization, the focus was squarely on the performance and security of the network. As discussions turned to the scanning program, the head of security operations confidently outlined the procedures in place to ensure comprehensive scanning—scanning that covered the entire network. Wait, scanning that covered the entire network? This is when my skepticism crept in.

“How do you know you’re scanning the entire network?” I interjected, addressing the elephant in the room. The head of security operations deflected to the head of network operations, claiming his assurance. “[Head of network operations] said I could…” she asserted.

Turning to the head of network operations, I couldn’t resist a quip: “Is that what you’re going to say to the auditor? ‘He said I could’?” Though we shared a solid working relationship, I couldn’t let such a critical issue slide with mere assurance. And it was clear that the others in the room shared my same concerns.

With a blend of humor and seriousness, I delved into the complexities and uncertainties inherent in ensuring comprehensive network scanning. Questions rained down from the attendees, making it clear that a deeper exploration of their scanning protocols was necessary to instill confidence in the organization’s security measures. I began to outline critical considerations:

  • Does the scanner have a complete list of all IP space on the network that needs scanned?
  • Are there any overlapping subnets? If so, that overlapped portion of a subnet is not visible to the scanner, thus, creating a possible hiding place for a bad actor.
  • Is there a duplicate IP space in the network? This creates blind spots to any scanner.
  • And finally, the hard part of the answer, does the scanner have logical access to the entire network? Even if the scanner is trying to scan a network subnet, if the network architecture via Access Control Lists and Routing is blocking the access or not granting the access, the scan won’t be complete. On top of that, you will get no indication from the scanner that the scan didn’t work.

Beyond the logical access issue, no one had thought about the other issues. I then explained how RedSeal automatically looks for subnets that have no scan data, thus possibly not part of the IP list giving to the scanner. Also, overlapping subnets and colliding IP space is revealed as a RedSeal finding. Finally, I also explained how a RedSeal Access Query combined with our “show what is missing” feature can give you a list of everything that the scanner can’t reach because of network architecture.

I ended my explanation with “these features will give you comprehensive documentation of complete scanner coverage for your upcoming audit(s)…”

After less than a few days of work, we had provided a list to both network operations and security operations of additions and changes required by both teams to make their vulnerability program complete.

At RedSeal, we’re committed to helping you fortify your digital infrastructure, for good. We proactively help visualize your network, identify attack paths, prioritize risk, and help you stay in compliance to ensure your business and customers stay secure.

Reach out to RedSeal or schedule a demo today.



Tales from the Trenches: When Low-Risk is Actually High-Concern

Since 2004, RedSeal has been instrumental in empowering our clients to comprehensively visualize and fortify their intricate networks. While our customers initially grasped the importance of understanding their network architecture, connections, and identifying potential risks, there’s often an enlightening “aha” moment when the true significance becomes unmistakable. These narratives, cherished within the confines of RedSeal, vividly exemplify the practical value of our platform beyond mere theory. In the words of our dedicated field team, who collaborates directly with our clients, this blog series aims to unveil the instances where the theoretical transforms into tangible reality. 

Today’s post is brought to you by Chris Morgan, Client Engagement Director 


In the realm of cybersecurity, where threats and vulnerabilities lurk aplenty, RedSeal stands as a beacon of innovation. Pioneers in network security analytics, RedSeal delivers actionable insights, enabling customers to close defensive gaps across their entire network. 

While reviewing a large medical provider’s network, we discovered several high- and medium-severity vulnerabilities within the network. However, it was the low-risk vulnerability we found to be of highest concern.  

Delving deeper into our investigation, we unearthed a situation of seismic proportions. Amidst the chaos of the COVID-19 era, the client’s IT team had inadvertently granted unrestricted access to a seemingly mundane printer. However, unbeknownst to them, and visible now only because of RedSeal, this printer served as direct access to more than 14,000 hosts within the client’s expansive network, opening access that could enable bad actors to directly invade much of the network. RedSeal’s comprehensive approach, merging risk and access, empowers genuine prioritization for clients. 

With a fresh eye toward restricting access, we worked with the medical provider to remediate the exposure immediately, tightening access controls for printers and implementing access logs, securing them for the future.  

At RedSeal, we’re committed to helping you fortify your digital infrastructure, for good. We proactively help visualize your network, identify attack paths, prioritize risk, and help you stay in compliance to ensure your business and customers stay secure. 

Reach out to RedSeal or schedule a demo today.