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

Source

https://github.com/bytesizedalex/CVE-2021-36934

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

CVE-2021-36934 PowerShell scripts

Readme

# CVE-2021-36934
CVE-2021-36934 PowerShell scripts

* Detection.ps1

This is a quick and dirty script to see if a machine may be vulnerable. It writes out a message to the shell indicating if BUILTIN\Users was detected in the permission list and includes the current permissions on the SAM path for validation.

If the system is unaffected or has been remediated you would see output similar to below - 

![Alt text](/PermissionsNotDetected.png?raw=true "PermissionsNotDetected")


* SCCM-Detection.ps1

This is a basic PowerShell script for use in SCCM configuration items. It will be used to validate whether a client is affected by this CVE.

* SCCM-Remediation.ps1

This is a basic PowerShell script for use in SCCM configuration items. It will remediate affected systems by resetting the permissions and removing any existing VSS shadow copies.

File Snapshot


 [4.0K]  /data/pocs/31291bf45f777c2c764fb1836537176018ab1d64
├── [ 864]  Detection.ps1
├── [ 34K]  LICENSE
├── [ 30K]  PermissionsNotDetected.png
├── [ 850]  README.md
├── [ 450]  SCCM-Detection.ps1
└── [ 470]  SCCM-Remediation.ps1

0 directories, 6 files

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