Matthew Creel

Matthew Creel

Discussion of environments susceptible to lateral movement through resource-based constrained delegation (RBCD) attacks, prompting me to take a deeper dive into the topic

Matthew Creel

Last month Fortalice open-sourced BOFHound, an offline BloodHound ingestor for raw ldapsearch results. Along with BOFHound, we released a companion tool for it, pyldapsearch, and submitted a pull request to TrustedSec's CS-Situational-Awareness-BOF modifying the ldapsearch BOF to include the nTSecurityDescriptor attribute. Adam Brown wrote a post accompanying the release, which covered much of the tool's background, including blue team strategies for detecting BloodHound useful and the red team's reversion to more manual LDAP querying techniques. This blog will serve as a follow-up to that post, covering some usage strategies for ldapsearch + BOFHound and going into the updates that were recently pushed to BOFHound in version 0.1.0.

Matthew Creel

Back in when I was getting started as a junior pentester, I vividly remember reading @byt3bl33d3r's 2017 post: Practical guide to NTLM Relaying in 2017 (A.K.A getting a foothold in under 5 minutes). I still recommend checking this out if you haven't already - it will cover the basics of NTLM relaying and background on some of the confusing pieces ([Net]NTLMv1/2 anyone?) that there's no need for me to repeat here. There's also a plethora of other great NTLM relay blogs and resources that I'll try to link to throughout this post, while I attempt to touch on the ever growing library of NTLM relay uses after 2021 introduced several new relay vectors.

Matthew Creel

ADCS has been a treasure trove for recent offensive operations while organizations are still catching up to the research released by Will Schroeder and Lee Christensen back in June. Amazingly, enough escalation vectors were dropped that 5 months later I still haven't found time to test and explore every one of them (suppose that means I'm still catching up too). Luckily, an ESC4 scenario prompted some digging into abusing ACL permissions to create vulnerable template states.

Matthew Creel

Active Directory Certificates and PKINIT are hot topics these days and our operators at Fortalice have been doing their best to stay on top of the new research and tools. My previous blog touched on PyWhisker and referenced one of its resources available on https://thehacker.recipes. While reading through the documentation there, a note near the bottom caught my eye, which stated: User objects can't edit their own msDS-KeyCredentialLink attribute while computer objects can.

Matthew Creel

On a recent red team engagement, our team was tasked with focusing on Active Directory Certificate Services (ADCS) exploitation. The objective was to identify certificate template misconfigurations and potentially achieve privilege escalation by abusing them. The concepts and attacks used were based around the work and whitepaper by Will Shroeder (@harmj0y) and Lee Christensen (@tifkin_).