7MS #506: Tales of Pentest Pwnage - Part 32

7MS #506: Tales of Pentest Pwnage - Part 32

Today's my favorite tale of pentest pwnage (again)! This time we're talking about sAMAccountName spoofing specifically. We also talk about my always-under-construction list of things I try early in a pentest for maximum pwnage:
  • Run PingCastle
  • Do the SharpHound/BloodHound dumps
  • Run the DHCP poisoning module of Responder
  • Check the ms-DS-MachineAccountQuota value in the domain - if its at the default (10), then any user can add machines to the domain.
Why is the ability to add machines to the domain important? Because in the case of the sAMAccountName spoofing, if you have a non-domain-joined machine like I do, you need the ability to add a computer object to the domain. Check the Pentestlab.blog article for more info, but essentially, if you have an unpatched domain controller and the ability to add computer objects to the domain, you can pull off the attack. The article goes into crazy good technical detail, and here's my not-so-technical explanation:

If I was on a pentest, and the DC was called 7MS-DC01, and I could join a machine to the domain (which as a reminder - ANY user can do if the machine quota value is at the default value of 10), I could rename that machine account to be 7MS-DC01 without the dollar sign, request a TGT for the domain controller's account, then restore the machine name back to what it was before. Now, because the TGT is stored in memory, we can use the S4U2self Kerberos extension to request a service ticket using a domain admin account. And because the original ticket belong to the 7MS-DC01 machine name which now doesn't exist, Kerberos will look for 7MS-DC01$ and will issue the ticket for the requested service.

I might've butchered that explanation mom, but I tried my best!

TLDL/TLDR: find and exploit these unpatched domain controllers with noPac. Enjoy!

Episoder(683)

7MS #35: OSCP – Part 4 (audio)

7MS #35: OSCP – Part 4 (audio)

This is the 4th thrilling installment in our exciting series about the awesome, challenging, rage-inducing, but ultimately rewarding training and certification called OSCP. Download: 7MS #35: OSCP – Part 4 (audio)

27 Des 20146min

7MS #34: The Hacker Playbook (audio)

7MS #34: The Hacker Playbook (audio)

I found a great bit of reading that walks you through the “plays” of hacking – enumeration, exploitation, post-exploitation, etc. It’s a great (and affordable) book called The Hacker Playbook. Cheggitowt! Download: 7MS #34: The Hacker Playbook (audio)

14 Nov 20147min

7MS #33: ProXPN (audio)

7MS #33: ProXPN (audio)

This episode’s all about a cool product called ProXPN that I use to encrypt/anonymize my traffic for various reasons. Not a sponsored episode or anything like that, but I am a fan of this service :-). Download: 7MS #33: ProXPN (audio)

7 Nov 20147min

7MS #32: OSCP – part 3 (audio)

7MS #32: OSCP – part 3 (audio)

Been a while since I shared an update on OSCP progress. It’s going good but…slow. However, I do have one (maybe obvious) tip to share that I hope will save you a ton of time. Download: 7MS #32: OSCP – part 3 (audio)

1 Nov 20147min

7MS #31: Network Detective (audio)

7MS #31: Network Detective (audio)

Network Detective is a tool we’ve been using as kind of an addendum to our full security assessment. It gives some nice, plain-English Excel spreadsheets and Word docs that report on AD health and structure, PC inventory and open ports, AV clients that aren’t working right, and a whole lot more. Download: 7MS #31: Network Detective…

25 Okt 20147min

7MS #30: Managing Privileged Accounts (audio)

7MS #30: Managing Privileged Accounts (audio)

Most organizations I talk to have no idea where their privileged accounts are used across the network. I recently saw a demo of a solution called CyberArk, which seems to address that problem. Download: 7MS #30: Managing Privileged Accounts (audio)

18 Okt 20147min

7MS #29: Follow Up Then (audio)

7MS #29: Follow Up Then (audio)

This isn’t necessarily related to security, but it’s about one of my favorite tools to keep my todos organized: FollowUp Then! Download: 7MS #29: Follow Up Then (audio)

11 Okt 20147min

7MS #28: Infosec for Kids? (audio)

7MS #28: Infosec for Kids? (audio)

This is more of a random, wondering aloud type of episode as I think about raising my kids with infosec in mind. Specifically, what’s life going to be like for them growing up in an Internet-soaked world where there are constantly text/video/photos of them going online – to stay forever? Download: 7MS #28: Infosec for Kids?…

27 Sep 20147min

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