With the release of Microsoft’s patch to fix CVE-2020-17049, I’m excited to share details about this vulnerability and how it could be exploited. This post is only a very high-level overview, and I strongly encourage readers who are interested to check out my follow-up posts which provide much more depth: To learn about Kerberos, Kerberos […]
Introduction and Background This attack expands upon the excellent research documented by Elad Shamir in “Wagging the Dog: Abusing Resource-Based Constrained Delegation to Attack Active Directory.” I’ll cover the key points below, but his article a great resource and primer for Kerberos and constrained delegation in AD. If you’re already familiar with the Kerberos fundamentals, […]
This post reviews how the Kerberos Bronze Bit vulnerability (CVE-2020-17049) can be exploited in practice. I strongly suggest first reading the Bronze Bit Attack in Theory post to understand why and how this attacks works. It is also worth noting that Microsoft published a patch for the vulnerability on November 10, 2020. The patch rollout […]