Automating the Discovery of NTLM Authentication Endpoints
Recently, I have been working on adding support for automated enumeration and discovery of NTLM authentication endpoints to Chariot, our external attack surface and continuous automated red teaming product. Our red team requested this feature as a way to identify NTLM authentication endpoints exposed over HTTP that they could potentially leverage for password spraying attacks […]
NTLMv1 vs NTLMv2: Digging into an NTLM Downgrade Attack
Overview During the summer, my colleague Derya Yavuz and I published an article on some of the different methods we’ve leveraged to elevate privileges within Active Directory environments. We discussed authentication coercion techniques such as PrinterBug, PetitPotam, and DFSCoerce. One of the techniques we mentioned in that article was performing an NTLM downgrade attack to […]
How to Detect DFSCoerce
Background On 18 June 2022, security researcher Filip Dragovic published proof-of-concept code for a new forced authentication technique named DFSCoerce. This technique, inspired by other forced authentication techniques like PetitPotam and SpoolSample, often is used to force a victim Windows host to authenticate to an attacker’s machine. The attacker can then relay the credentials to […]