Want to test #printnightmare (ep 4.x) user-to-system as a service?🥝
(POC only, will write a log file to system32)

connect to \\printnightmare.gentilkiwi.com with
- user: .\gentilguest
- password: password

Open 'Kiwi Legit Printer - x64', then 'Kiwi Legit Printer - x64 (another one)'
You can prevent this behavior by settings some parameters/GPO:

'Package Point and print - Approved servers'
> docs.microsoft.com/troubleshoot/w…
> admx.help/?Category=Wind…

Of course, disable outbound access to CIFS/SMB/RPC...
Very bad impersonation when: docs.microsoft.com/windows-hardwa…
And the magic 🪄

Does it remind you and old #printnightmare CVE with DataFile and ConfigFile ?

I'm sure it does.

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More from @gentilkiwi

30 Jun
This #printnightmare / CVE-2021-1675 is really serious 🤪

Just adapted/simplified original POC then:
*From Remote standard user to SYSTEM*

Here on a domain controller, but valid on all systems with RPC to spooler available, remote or local

➡️ disable service now (no patch yet)
As usual, video quality: video.twimg.com/tweet_video/E5…
Yes, DC is 2019 and fully patched
And 'localspl.dll' is 06/06/2021 (10.0.17763.1999)

@byt3bl33d3r @allevon412 @PythonResponder

But to be transparent, I don't have a recent CPU & TPM 2.0
That might be the problem, @msftsecurity, isn't it?
Read 4 tweets

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