Revisiting Insecure Direct Object Reference (IDOR)
The new year has begun, and as a penetration tester at Black Hills Information Security, one thing really struck me as I reflected on 2023: a concerningly large number of […]
Red Team
Bypass NTLM Message Integrity Check – Drop the MIC
In An SMB Relay Race – How To Exploit LLMNR and SMB Message Signing for Fun and Profit, Jordan Drysdale shared the dangers of lack of SMB Signing requirements and […]
Testing TLS and Certificates
Pentest reports sometimes include bad information under a heading like, “Weak TLS Configuration” or “Insecure SSL Certificates.” This article will explain how TLS is supposed to work, common ways it […]
Hunting for SSRF Bugs in PDF Generators
If you’ve been on a website and noticed one of the following features, there’s a good chance you’ve stumbled upon a hot spot for server-side request forgery (SSRF) bugs: Before […]
Spamming Microsoft 365 Like It’s 1995
I previously blogged about spoofing Microsoft 365 using the direct send feature enabled by default when creating a business 365 Exchange Online instance (https://www.blackhillsinfosec.com/spoofing-microsoft-365-like-its-1995/). Using the direct send feature, it […]
Abusing Active Directory Certificate Services (Part 3)
| Alyssa Snow In PART ONE and PART TWO of this blog series, we discussed common misconfigurations of Active Directory certificate templates. In this post, we will walk through exploitation […]
Introducing GraphRunner: A Post-Exploitation Toolset for Microsoft 365
By Beau Bullock & Steve Borosh TL;DR We built a post-compromise toolset called GraphRunner for interacting with the Microsoft Graph API. It provides various tools for performing reconnaissance, persistence, and […]
Abusing Active Directory Certificate Services – Part 2
| Alyssa Snow Misconfigurations in Active Directory Certificate Services (ADCS) can introduce critical vulnerabilities into an Enterprise Active Directory environment, such as paths of escalation from low privileged accounts to […]
Abusing Active Directory Certificate Services – Part One
| Alyssa Snow Active Directory Certificate Services (ADCS)1 is used for public key infrastructure in an Active Directory environment. ADCS is widely used in enterprise Active Directory environments for managing […]