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CERT/CC Blog

Vulnerability Insights

Hi, this is Jonathan Spring with my colleague Leigh Metcalf. For some time now, we've been working through a problem we found, but it's time to discuss it more broadly. Using our passive DNS data source, we can observe cache poisoning. What we really observe are changes in the answers that are returned for certain domains, but after consulting with various experts, we believe the only behavior these changes indicate is a successful cache poisoning attack.

Hi folks, it's Will. Recently I have been investigating man-in-the-middle (MITM) techniques for analyzing network traffic generated by an application. In particular, I'm looking at web (HTTP and HTTPS) traffic. There are plenty of MITM proxies, such as ZAP, Burp, Fiddler, mitmproxy, and others. But what I wanted was a transparent network-layer proxy, rather than an application-layer one. After a bit of trial-and-error investigation, I found a software combination that works well for this purpose. I'm happy to announce the release of CERT Tapioca (Transparent Proxy Capture Appliance), which is a preconfigured VM appliance for performing MITM analysis of software.

Hi, it's Will. We are all probably annoyed by software that bundles other applications that we didn't ask for. You want a specific application, but depending on what the application is, where you downloaded it from, and how carefully you paid attention to the installation process, you could have some extra goodies that came along for the ride. You might have components referred to as adware, foistware, scareware, potentially unwanted programs (PUPs), or worse. Sure, these may be annoyances, but there's an even more important security aspect to these types of applications: attack surface.

The idea of a cyber-immune system sometimes circulates through the community. It seems that such proposals either do not properly frame how the immune system works, how good computer security would work, or both. I'm going to try to put both of those in context in order to make clear why cybersecurity is not like the immune system, but why it would be nice if it were.