7MS #640: Tales of Pentest Pwnage – Part 63

7MS #640: Tales of Pentest Pwnage – Part 63

This was my favorite pentest tale of pwnage to date! There’s a lot to cover in this episode so I’m going to try and bullet out the TLDR version here:

  • Sprinkled farmer files around the environment
  • Found high-priv boxes with WebClient enabled
  • Added “ghost” machine to the Active Directory (we’ll call it GHOSTY)
  • RBCD attack to be able to impersonate a domain admin using the CIFS/SMB service against the victim system where some higher-priv users were sitting
  • Use net.py to add myself to local admin on the victim host
  • Find a vulnerable service to hijack and have run an evil, TGT-gathering Rubeus.exe – found that Credential Guard was cramping my style!
  • Pulled the TGT from a host not protected with Credential Guard
  • Figured out the stolen user’s account has some “write” privileges to a domain controller
  • Use rbcd.py to delegate from GHOSTY and to the domain controller
  • Request a TGT for GHOSTY
  • Use getST.py to impersonate CIFS using a domain admin account on the domain controller (important thing here was to specify the DC by its FQDN, not just hostname)
  • Final move: use the domain admin ccache file to leverage net.py and add myself to the Active Directory Administrators group

Jaksot(681)

7MS #9: Information Security for the Whole Family (audio)

7MS #9: Information Security for the Whole Family (audio)

In this episode I talk about how being an infosec guy has ruined my family’s life (well, not really) Download: Episode 9: Information Security for the Whole Family (audio) Show notes: To keep peace in your household, I’d recommend making sweeping network changes when your family members aren’t around (i.e. changing the wifi password :-)…

29 Maalis 20147min

7MS #8: CISSP – Is That the Cert for Me? (audio)

7MS #8: CISSP – Is That the Cert for Me? (audio)

In this episode I talk about my experience prepping for the CISSP exam. Download: Episode 8: CISSP – Is That the Cert for Me? (audio) Show notes: I used this book as my primary study tool. It comes with a whole slew of companion materials like a pre-assessment test, flashcards and 3 full practice exams.…

22 Maalis 20147min

7MS #7: External Vulnerabilities that Byte (audio)

7MS #7: External Vulnerabilities that Byte (audio)

Episode lucky #7!!! In this episode I talk about external network vulnerabilities that we see in many of our assessments – some of which are pretty easy to clear up. Download: Episode 7: External Vulnerabilities that Byte (audio) Show notes: RC4 – a risk that we find just about anywhere SSL is used, but in…

15 Maalis 20147min

7MS #6: Fun Firewall Rules – part 2 (audio)

7MS #6: Fun Firewall Rules – part 2 (audio)

In this episode I continue talking about some basic firewall rules that many organizations don’t have in place. Download: Episode 6: Fun Firewall Rules – part 2 (audio) Show notes: Limit outbound DNS requests to just the ISP servers (or whatever external servers you use). Anytime a firewall rule is changed, perform a vulnerability scan…

8 Maalis 20147min

7MS #5: Fun Firewall Rules – part 1 (audio)

7MS #5: Fun Firewall Rules – part 1 (audio)

In this episode I talk about some basic firewall rules that many organizations don’t have in place. Download: Episode 5: Fun Firewall Rules – part 1 (audio) Show notes: Block outbound port TCP 25 for all devices except your mail server(s). If you use a third party mail filter like Postini or Securence, ensure that…

1 Maalis 20147min

7MS #4: Patch Strategies: Part Deux (audio)

7MS #4: Patch Strategies: Part Deux (audio)

In this episode I continue talking about some dos and donts of patch strategies – this time talking about enterprise level gear. Download: Episode 4: Patch Strategies: Part Deux (audio) Show notes: There are often two trains of thought in regards to enterprise gear patching (like routers, switches, firewalls). 1. If it ain’t broke, don’t…

22 Helmi 20146min

7MS #3: Patch Strategies: Part 1 (audio)

7MS #3: Patch Strategies: Part 1 (audio)

In this episode I talk about some trends (and problems) we’re seeing on the patching front – specifically OS and third-party apps. Download: Episode 3: Patch Strategies: Part 1 (audio) Show notes: Most organizations have the Microsoft side of the house patched well – but the third party apps (Java/Flash/Reader/etc.)? Not so much…but that’s just…

13 Helmi 20147min

7MS #2: The Importance of Logging and Alerting! (audio)

7MS #2: The Importance of Logging and Alerting! (audio)

In this episode I talk about how a client of ours learned a hard lesson: that the lack of logging/alerting makes for a pretty miserable investigation after they were breached. Download: Episode 2: The Importance of Logging and Alerting! (audio) Show notes: Public-facing terminal servers without 2FA basically have a sign on their back that…

1 Helmi 20147min

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