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(687)

7MS #334: IT Security Horrors That Keep You Up at Night

7MS #334: IT Security Horrors That Keep You Up at Night

This week I got to celebrate Halloween with my friends at Netwrix by co-hosting a Webinar called IT Security Horrors That Keep You Up at Night. The content was a modified version of the Blue Team on a Budget talk I've been doing the past year or so, and essentially focuses on things organizations can do to better defend their networks without draining their budgets. The presentation had a Child's Play theme and showed Chucky trying to hack Andy's company via: Phishing Abusing bad domain passwords Abusing bad local admin passwords Responder attack Lack of SMB signing Each attack was also followed up my some advice for how to stop it (or at least slow down its effectiveness). The presentation itself was a blast and I learned some good public speaking lessons as a result: Get your slides done early! - when co-presenting, it makes sense that they want to see your slides sooner than the day of! :-) Don't freak out about an audience of "none" - I always think Webinars are weird because you can't see people's faces or interpret their body language to get a feel for whether they appreciate your humor or understand the points you're trying to make. I learned you just gotta keep pushing forward "blind" whether you like it or not. Setup a redundant presentation system - ok so file this one with the irrational fears dept, but I actually had a second laptop ready with my presentation loaded, and the laptop was connected to a cell hotspot I setup on a tablet. That way if my machine BSOD'd or Internet went out in my house, I could quickly rejoin the presentation and pick up where I left off. Safe or psycho? You decide! Happy belated Halloween!

1 Nov 201823min

7MS #333: Pentesting Potatoes

7MS #333: Pentesting Potatoes

This week I was in lovely Boise, Idaho doing some security assessment work. While I was there I got to hang out with Paul Wilch and some of the Project7 crew and picked up a lot of cool tools and tips I share in today's episode: The Badger Infosec group did a cool Rubber Ducky demo. Dan from DDSec did a demo of PlexTrac which is "the last cybersecurity reporting tool you will ever need." I'm actually going to use PlexTrac for my next few assessments and am working to line up a future interview with Dan to learn even more. Paul gave a demo of Parrot which is cool and Kali-like. However, when Paul and I did a side-by-side test with Kali, we noticed that Parrot kind of barfed when it set out to do an Eyewitness report. After meeting Paul's son, Simon, I'm optimistic about the future IT/security leaders in this country. There are some wicked-smart youth out there! Paul gave me a hotel keycard lockpick/shiv (his own creation!) and staged a few doors for me to try and bypass. He made it interesting when he promised to throat-punch me if I failed! Thankfully, I got off without any throat punches!

26 Okt 201813min

7MS #332: Low Hanging Hacker Fruit

7MS #332: Low Hanging Hacker Fruit

In this episode I'm releasing a new document aimed to help organizations eliminate low hanging hacker fruit from the environment. The document contains (relatively) cheap and (relatively) easy things to implement. And my hope is it can be a living/breathing document that will bulk up over time. Got things to add to this list? Then please comment on the gist below!

17 Okt 20188min

7MS #331: How to Become a Packtpub Author - Part 3

7MS #331: How to Become a Packtpub Author - Part 3

It's done! It's done!! It's DONE!!! That's right mom, my PacktPub course called Mastering Kali Linux Network Scanning is done! In today's episode I: Recap the course authoring experience Explain my super anal retentive editing process that takes 4 hours for every 10 minutes of produced video Admit some last minute mistakes that about made me quit the whole project With the holidays coming up, this course is a perfect gift for that IT or security person in your life :-). Buy them a copy - or 10! Psst! I will soon be getting a handful of vouchers to the course that I can give away to podcast listeners. Interested in one? Ping me and I'll draw names from a virtual hat in a few weeks!

10 Okt 20187min

7MS #330: Interview with Nathan Hunstad of Code42

7MS #330: Interview with Nathan Hunstad of Code42

In today's episode, I'm excited to be joined in the studio by Nathan Hunstad, Director of Security at Code42. Nathan and I had a great chat about Code42's new security offering called Code42 Forensic File Search, which helps IT and security teams figure out where files are located across their enterprise - even if the endpoints are offline. This functionality lends itself to a number of interesting use cases and helps answer questions such as: "Does known malware have, or has it ever had, a foothold in our environment?" "Has a particular crypto-mining agent been installed on our employees’ computers? Who has it now?" "What endpoints have or had copies of our company’s most sensitive files?" "What files did an employee download or delete in the months before resigning?" "What non-sanctioned collaboration applications are present in our environment?" After today's podcast, be sure to check out this great video of Nathan demonstrating the power of Code42 Forensic File Search live! Also talked about in today's episode: Implementing host-based firewalls - here's a great blog and video on it I want to thank Code42 for their support of the 7 Minute Security podcast. It's a pleasure to work together with them to help companies be more secure!

3 Okt 201852min

7MS #329: Active Directory Security 101

7MS #329: Active Directory Security 101

Today's episode is brought to you by my friends at Netwrix. Their amazing Netwrix Auditor tool gives you visibility into what’s happening both on your local network and cloud-based IT systems and tells you about critical changes, and when and where people have been accessing data. Give it a spin right in your browser here, and then try it in your environment free for 20 days! www.netwrix.com Welcome! Today I'm kicking off a new miniseries all about the fundamentals of Active Directory security. Rather than try to pile all the info into show notes, I'm going to start pumping everything into a living/breathing GitHub gist so we're all on the same page as this miniseries develops further. So, please feel free to check out that gist here.

27 Sep 201821min

7MS #328: How to Succeed in Business Without Really Crying - Part 5

7MS #328: How to Succeed in Business Without Really Crying - Part 5

This episode is a cavalcade of fun! Why? First, I've got a big announcement: I've accepted a new position. "What?!" exclaimed my mom. "I thought you were president of 7MS, what the what?" No worries, it's business as usual, and my responsibilities at 7MS aren't changing. But I'm also going to start writing blogs, nurturing a Slack channel and producing a podcast for somebody else each week. Tune in to find out who! Oh, and I also conclude this episode with a song from my band, Sweet Surrender. A few years ago we wrote a goofy song to start our shows called Sound Check, and in this episode, I wanted to debut the sequel to that song...called MANDATORY ENCORE. Enjoy.

19 Sep 201828min

7MS #327: Interview with John Strand

7MS #327: Interview with John Strand

Today's episode is brought to you by my friends at Netwrix. Their amazing Netwrix Auditor tool gives you visibility into what’s happening both on your local network and cloud-based IT systems and tells you about critical changes, and when and where people have been accessing data. Give it a spin right in your browser here, and then try it in your environment free for 20 days! www.netwrix.com Well I'm geeking out big time because today I chatted with John Strand of Black Hills Information Security, SANS instructing, Security Weekly, Active Countermeasures, RITA and more. Some people think he looks like Wash from Serenity or Steve the Pirate from Dodgeball, and others get upset when they learn he's not John Strand the male model. I've followed John and his team's work since I got started in security, and they've been a huge inspiration for what I do at 7MS. If you're not watching the BHIS Webcasts stop what you're doing and subscribe now! They're all full of practical, hands-on security advice - often complemented by tools that are totally free! Anyway, enjoy today's interview where John and I talk about how to make pentesters' jobs harder, and why he'd rather be a security advisor to Katy Perry than Donald Trump.

13 Sep 201846min

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