ZeroLogon is a vulnerability which exits within the netlogon protocol.
What is netlogon ?
Netlogon service is a Authentication Mechanism used in the Windows Client Authentication Architecture which verifies logon requests, and it registers, authenticates, and locates Domain Controllers.
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This vulnerability is exploitable due to flaw that is present with the encryption implimentation of AES-CFB8 (which is used for netlogon protocol encryption)
Sending a string of zeros to the netlogon triggers the vulnerability. By doing so the attacker can do privilege escalation and gain the admin privileges.
This can provide the attacker with :
-Access to the entire domain
In August 2020 Microsoft has provided a security update regarding this vulnerability which you can find here
You can use the ZeroLogon Tester Script to test your network for this vulnerability.
You can find the scipt here : https://github.com/SecuraBV/CVE-2020-1472
Hope this post was informational.
Until next post Stay tuned