CVE-2021-36934 PoC — Windows Elevation of Privilege Vulnerability

Source

https://github.com/WiredPulse/Invoke-HiveNightmare

Associated Vulnerability

Title:Windows Elevation of Privilege Vulnerability (CVE-2021-36934)
Description:An elevation of privilege vulnerability exists because of overly permissive Access Control Lists (ACLs) on multiple system files, including the Security Accounts Manager (SAM) database. An attacker who successfully exploited this vulnerability could run arbitrary code with SYSTEM privileges. An attacker could then install programs; view, change, or delete data; or create new accounts with full user rights. An attacker must have the ability to execute code on a victim system to exploit this vulnerability. After installing this security update, you must manually delete all shadow copies of system files, including the SAM database, to fully mitigate this vulnerabilty. Simply installing this security update will not fully mitigate this vulnerability. See <a href="https://support.microsoft.com/topic/1ceaa637-aaa3-4b58-a48b-baf72a2fa9e7">KB5005357- Delete Volume Shadow Copies</a>.

Description

PoC for CVE-2021-36934, which enables a standard user to be able to retrieve the SAM, Security, and Software Registry hives in Windows 10 version 1809 or newer

Readme

# Invoke-HiveNightmare
PowerShell-based PoC for CVE-2021-36934, which enables a standard user to be able to retrieve the SAM, Security, and Software Registry hives in Windows 10 version 1809 or newer.

# Situation
In specific versions of Windows 10, standard users have read/execute rights to files in [SYSTEMROOT]\System32\Config directory, which is where the Registry hives reside on disk. One can't however, simply navigate to the directory and copy/paste as the hives are loaded and into memory upon system boot and are locked. A standard user can retrieve the hives from Volume Shadow Copies if they exist. 

# Demo
![ Alt text](https://github.com/WiredPulse/Invoke-HiveNightmare/blob/main/PoC.gif) / ! [](name-of-gif-file. gif)

# Disclaimer
The success of this exploit resides on the fact that Volume Shadows Copies exist... without them the code isn't useful. 

# Credits
The vulnerability was discovered by @jonasLyk.

File Snapshot


 [4.0K]  /data/pocs/5452a03c7960cece86cd6300345c91bd9a470438
├── [2.6K]  Invoke-HiveNightmare.ps1
├── [308K]  PoC.gif
└── [ 927]  README.md

0 directories, 3 files

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