7 Minute Security3 Feb 2022

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!

Det här avsnittet är hämtat från ett öppet RSS-flöde och publiceras inte av Podme. Det kan innehålla reklam.

Avsnitt(738)

7MS #738: Baby's First ProjectDiscovery Neo

Hey friends! Today I'm talking about Baby's First Neo — and to be crystal clear, I don't mean Keanu, and I don't mean the R&B guy with the hat. I mean the AI-powered pentest assistant from our pals at...

4 Sep 29min

7MS #737: Tales of Pentest Pwnage – Part 88

Hello friends! Today's tale of pentest pwnage isn't a start-to-finish march to DA – it's me finally emptying out the backlog of "gosh, I've got to share this next time" internal network tips that have...

28 Aug 33min

7MS #736: Securing Your Family During and After a Disaster – Part 9

Hey friends! Today's another slice of our Securing Your Family During and After a Disaster miniseries, and fair warning — it's a bit of a Friday mood-ruiner. It's been almost two months since my dad p...

21 Aug 29min

7MS #735: Baby's First Cloudflare Tunnel

Hey friends! Today's episode has a new-to-me toy up front and some podcast housekeeping on the back half – all recorded with a raging case of the anxious parent giggidies, because my son Atticus had a...

14 Aug 24min

7MS #734: Insight Recon

Hey friends! Today's episode is a two-parter: some security stuff up front, and then a big ol' personal celebration on the back half. If you're strictly here for the security bits, I love you and you'...

7 Aug 32min

7MS #733: Tales of Pentest Pwnage – Part 87

Hey friends! Today's episode comes to you from a parking lot in the rain, with a mint hot cocoa in hand and your host absolutely dragging his butt (D-R-A-G-G-I-N-G, not D-R-A-G-O-N – I've never seen a...

31 Juli 23min

7MS #732: Tales of Pentest Pwnage – Part 86

Hey friends! Welcome back to another Tales of Pentest Pwnage — my favorite mini-series where I share the good, the bad, and the "why didn't I check THAT first?!" moments from real-world engagements. T...

24 Juli 40min

7MS #731: CARTP – Cloud Red Team Tactics for Attacking and Defending Azure – THE FINAL CHAPTER!

Hey friends! Fair warning: today's episode is a bit of an emotional rollercoaster — we've got a big security win, some honest lab feedback, and a very personal share about my dad's funeral. Buckle up....

17 Juli 53min