Simple Bypass for PowerShell Constrained Language Mode

Edit – I just had this pointed out to me that on Friday 17th March Lee Holmes wrote about this very attack on his blog here – This is a pure coincidence and I was not aware of this blog post by Lee at the time.

We all know that Microsoft has added some nice features to PowerShell v5 to help out the Blue teams, Constrained Language Mode, Deep Scriptblock logging, system wide transcripts and AMSI to name a few.
This blog is not a lesson on each of the features mentioned above, for more information this is a great place to start – Microsoft PowerShell Blue team.
This blog is also not about the awesome bypasses highlighted by Casey Smith, aka @SubTee, again detailed info can be found here – @SubTee Blog.

What I’ve found is probably not even new, but I can’t find anything written about it. This is a very simple and almost too easy a way to bypass Constrained Language Mode. I still can’t believe it myself.

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PowerShell PSRemoting Pwnage


You have obtained some level of admin creds, (local, domain or otherwise) to a windows server/domain, there is no RDP. There is however the WinRM service, PSRemoting to give it its other name, this allows an admin to create a remote PowerShell session to the server and run commands or scripts, very much like the ssh service used on Linux systems.
The admin level creds you have will allow you to connect to the remote server(s) via PSRemoting, and you will want to run hacker PowerShell tools in the remote session to further infiltrate the server or systems, however, given the lack of RDP and the locked down state of the network and services, you may struggle to get the likes of PowerSploit onto the remote system.

So for instance we might want to run Invoke-Mimikatz on the remote server to extract clear text credentials stored on the server. Lets explore PSRemoting in a liitle more depth.

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Active Directory KungFu – Messing With Users & Computers

Recently on an internal Pentest, I needed to get a new user into the Domain Admins group, which I couldn’t manage to accomplish with the usual net localgroup group username /add /domain command, I had managed to add a user to the domain – daveisahacker – using net user daveisahacker Password123 /add /domain.

I really need to get a user into Domain Admin, and as I had a token impersonation of domain admin, but couldn’t sign on to a DC because I had no password.

So I thinks what about the Directory services commands – DSQUERY, DSMOD, and all of the other DS commands, I might be able to add a user to the Domain Admins group that way.

DSQUERY Command @ Technet

DSMOD Command @ Technet

So, OK lets have a look at these command and what to do with them.

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Maybe We Should Not Use Adobe Reader – Looking For An Alternative

After the recent emergency out of cycle patch of Adobe Reader (again!), maybe we should be looking toward finding a better solution to the problem – the fact that Adobe cannot write secure software.

Yeah I know they are releasing Reader X with ‘sandboxing’ la la la, link here to article on ThreatPost,  but maybe they should just write some decent secure code – its only a document viewer after all!

After doing a bit of research and having some experience using alternate PDF readers, I’ve come to the conclusion that there are other better more secure applications.

There is 1 application in particular – Evince – the 1 included with Ubuntu and other Gnome distro’s, I have found only 1 advisory listed on Exploitdb where as Adobe Reader, Exploitdb lists 9 and visit the Adobe site and search for advisories and you’ll be amazed how many there are listed.

Continue reading “Maybe We Should Not Use Adobe Reader – Looking For An Alternative”