Martin Sohn Christensen

Profiles

• X @martinsohndk
• Bluesky @martinsohn.dk
• LinkedIn @martinsohn
• Github @martinsohn

Tools

• CIS Controls Initial Assessment Tool v8.0b
• Office phish templates and defense recommendations
• PowerShell TCP reverse shell
• CVE-2020-8816 analysis and PoC

Posts

• 2023-03-02, How I killed BT's payphone email service
• 2023-02-13, Basic Microsoft Active Directory Security - Identify and Prioritize Low-hanging Risks
• Series: Email security (collab)
  • 2022-06-21, Part 1: All Your SPF Includes Are Belong To Us
  • 2022-06-27, Part 2: Phish'n'Chimps: email spoofing via marketing and CRM platforms
  • 2022-07-08, Part 3: Email Security Pitfalls
• Series: SID filter as security boundary between domains? (collab)
  • 2022-03-28, Part 1: Kerberos authentication explained
  • 2022-03-29, Part 2: Known AD attacks - from child to parent
  • 2022-04-01, Part 3: SID filtering explained
  • 2022-04-04, Part 4: Bypass SID filtering research
  • 2022-04-06, Part 5: Golden GMSA trust attack - from child to parent
  • 2022-04-07, Part 6: Schema change trust attack - from child to parent
  • 2022-04-08, Part 7: Trust account attack - from trusting to trusted
• 2022-03-01, Network share risks - Deploying secure defaults and searching shares for sensitive information (credentials, PII, and more)
• 2022-12-03, The command prompt has been disabled by your administrator. Press any key to continue... or use these weird tricks to bypass – admins will hate you!

Talks

• 2022-10-09, BSides Copenhagen 2022: Don't be trusted: Active Directory trust attacks, and the recording
• 2022-08-14, Adversary Village DEF CON 30: Don't be trusted: Active Directory trust attacks
• 2022-03-26, OWASP Copenhagen: Email spoofing via marketing platforms

CVEs

• PeaZip - Local privilege escalation vulnerabilities in PeaZip MSI installer
  • CVE-2022-40779: Privilege escalation in PeaZip version 8.8.0 MSI installer due to EXEMSI vulnerability
  • CVE-PENDING: Privilege escalation in PeaZip version 8.8.0 MSI Installer due to incorrect access control
• Anaconda3 and Miniconda3 - Privilege escalation vulnerability in Anaconda3 and Miniconda3
  • CVE-2022-26526: Privilege escalation in Anaconda3 v2021.11.0.0 and Miniconda3 v11.0.0.0
• NinjaRMM Agent - Privilege escalation vulnerability in NinjaRMM Agent MSI Installer introduced by EXEMSI MSI Wrapper
  • CVE-2021-26273: Privilege escalation in NinjaRMM Agent v5.0.909
  • CVE-2021-26274: Insecure installation folder permissions in NinjaRMM Agent v5.0.909
  • CVE-2021-32415: EXEMSI MSI Wrapper Versions prior to 10.0.50 and at least since version 6.0.91 will introduce a local privilege escalation vulnerability in installers it creates.

Certifications/trainings

• Outsider Security - Offensive Entra ID (Azure AD) and Hybrid AD Security @ Insomni'hack 2024
• SpecterOps - Adversary Tactics: Vulnerability Research for Operators @ Black Hat 2023
• SpecterOps - Adversary Tactics: Tradecraft Analysis @ Black Hat 2022
• eLearnSecurity - Certified Professional Penetration Tester (eCPPTv2)
• Zero-Point Security - Certified Red Team Operator (CRTO)
• Pentester Academy - Certified Red Team Professional (CRTP)