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CVE-2020-1472 POC

2020-09-15 12:00

https://github.com/dirkjanm/CVE-2020-1472

Requires the latest impacket from GitHub with added netlogon structures.

Do note that by default this changes the password of the domain controller account. Yes this allows you to DCSync, but it also breaks communication with other domain controllers, so be careful with this!

More info and original research here

Exploit steps

  • Read the blog/whitepaper above so you know what you’re doing
  • Run cve-2020-1472-exploit.py with IP and netbios name of DC
  • DCSync with secretsdump, using -just-dc and -no-pass or empty hashes and the DCHOSTNAME$ account

Restore steps

If you make sure that this line in secretsdump passes (so make it if True: for example) secretsdump will also dump the plaintext (hex encoded) machine account password from the registry. You can do this by running it against the same DC and using a DA account.

Alternatively you can dump this same password by first extracting the registry hives and then running secretsdump offline (it will then always print the plaintext key because it can’t calculate the Kerberos hashes, this saves you modifying the library).

With this password you can run restorepassword.py with the -hexpass parameter. This will first authenticate with the empty password to the same DC and then set the password back to the original one. Make sure you supply the netbios name and IP again as target, so for example:

python restorepassword.py testsegment/s2016dc@s2016dc -target-ip 192.168.222.113 -hexpass e6ad4c4f64e71cf8c8020aa44bbd70ee711b8dce2adecd7e0d7fd1d76d70a848c987450c5be97b230bd144f3c3...etc

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知识来源: https://www.chabug.org/tools/1865.html

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