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CVE-2021-36934— Windows Elevation of Privilege Vulnerability

Quick assessment

Affected
Microsoft Windows 10 Version 1809
Exploitation
Confirmed exploitation in the wild; remediate immediately
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Microsoft Windows是美国微软（Microsoft）公司的一种桌面操作系统。 Microsoft Windows 存在访问控制错误漏洞，该漏洞源于系统对多个系统文件的访问控制列表过于宽松，因此存在特权提升漏洞。成功利用此漏洞的攻击者可以使用SYSTEM权限运行任意代码。

CVSS 7.8 · High KEV EPSS 67.25% · P99

Public Exploits 1

Metasploit · 1 windows_sam_hivenightmare.rb [post]

Affected Version Matrix 6

VendorProduct Version RangeStatus
Microsoft Windows 10 Version 1809 10.0.17763.0< 10.0.17763.2114 affected
10.0.0< 10.0.17763.2114 affected
Microsoft Windows 10 Version 1909 10.0.0< 10.0.18363.1734 affected
Microsoft Windows 10 Version 2004 10.0.0< 10.0.19041.1165 affected
Microsoft Windows 10 Version 20H2 10.0.0< 10.0.19042.1165 affected
Microsoft Windows 10 Version 21H1 10.0.0< 10.0.19043.1165 affected
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I. Basic Information for CVE-2021-36934

Vulnerability Information
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Vulnerability Title
Windows Elevation of Privilege Vulnerability
Source: CVE Program / CVE List V5
Vulnerability 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 KB5005357- Delete Volume Shadow Copies.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
N/A
Source: CVE Program / CVE List V5
Vulnerability Title
Microsoft Windows 访问控制错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Microsoft Windows是美国微软（Microsoft）公司的一种桌面操作系统。 Microsoft Windows 存在访问控制错误漏洞，该漏洞源于系统对多个系统文件的访问控制列表过于宽松，因此存在特权提升漏洞。成功利用此漏洞的攻击者可以使用SYSTEM权限运行任意代码。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

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Affected Products

Vendor Product Affected Versions CPE Subscribe
Microsoft Windows 10 Version 1809 10.0.17763.0 ~ 10.0.17763.2114 -
Microsoft Windows 10 Version 1809 10.0.0 ~ 10.0.17763.2114 -
Microsoft Windows 10 Version 1909 10.0.0 ~ 10.0.18363.1734 -
Microsoft Windows 10 Version 2004 10.0.0 ~ 10.0.19041.1165 -
Microsoft Windows 10 Version 20H2 10.0.0 ~ 10.0.19042.1165 -
Microsoft Windows 10 Version 21H1 10.0.0 ~ 10.0.19043.1165 -

II. Public POCs for CVE-2021-36934

# POC Description Source Link Shenlong Link
1 Pure Nim implementation for exploiting CVE-2021-36934, the SeriousSAM local privilege escalation https://github.com/HuskyHacks/ShadowSteal POC Details
2 Fix for the CVE-2021-36934 https://github.com/JoranSlingerland/CVE-2021-36934 POC Details
3 Detection and Mitigation script for CVE-2021-36934 (HiveNightmare aka. SeriousSam) https://github.com/n3tsurge/CVE-2021-36934 POC Details
4 Small and dirty PoC for CVE-2021-36934 https://github.com/Wh04m1001/VSSCopy POC Details
5 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 https://github.com/WiredPulse/Invoke-HiveNightmare POC Details
6 HiveNightmare a.k.a. SeriousSam Local Privilege Escalation in Windows – CVE-2021-36934 https://github.com/romarroca/SeriousSam POC Details
7 A capability to identify and remediate CVE-2021-36934 (HiveNightmare) https://github.com/WiredPulse/Invoke-HiveDreams POC Details
8 CVE-2021-36934 PowerShell Fix https://github.com/tda90/CVE-2021-36934 POC Details
9 Windows Elevation of Privilege Vulnerability (SeriousSAM) https://github.com/VertigoRay/CVE-2021-36934 POC Details
10 CVE-2021-36934 PowerShell scripts https://github.com/bytesizedalex/CVE-2021-36934 POC Details
11 C# PoC for CVE-2021-36934/HiveNightmare/SeriousSAM https://github.com/Preventions/CVE-2021-36934 POC Details
12 PoC for CVE-2021-36934 Aka HiveNightmare/SeriousSAM written in python3 https://github.com/Sp00p64/PyNightmare POC Details
13 This PowerShell script will take the mitigation measures for CVE-2021-36934 described by Microsoft and the US CERT team. https://msrc.microsoft.com/update-guide/vulnerability/CVE-2021-36934 https://kb.cert.org/vuls/id/506989 USE AT YOUR OWN RISK -- BACKUPS MAY BREAK. https://github.com/jmaddington/Serious-Sam---CVE-2021-36934-Mitigation-for-Datto-RMM POC Details
14 None https://github.com/0x0D1n/CVE-2021-36934 POC Details
15 HiveNightmare aka SeriousSAM https://github.com/exploitblizzard/CVE-2021-36934 POC Details
16 CVE-2021-36934 HiveNightmare vulnerability checker and workaround https://github.com/irissentinel/CVE-2021-36934 POC Details
17 SeriousSAM Auto Exploiter https://github.com/websecnl/CVE-2021-36934 POC Details
18 POC experiments with Volume Shadow copy Service (VSS) https://github.com/grishinpv/poc_CVE-2021-36934 POC Details
19 Windows Elevation of Privilege Vulnerability CVE-2021-36934 https://github.com/shaktavist/SeriousSam POC Details
20 None https://github.com/OlivierLaflamme/CVE-2021-36934-export-shadow-volume-POC POC Details
21 Exploit for CVE-2021-36934 https://github.com/chron1k/oxide_hive POC Details
22 PoC for CVE-2021-36934 Aka HiveNightmare/SeriousSAM written in python3 https://github.com/Sp00kySkelet0n/PyNightmare POC Details
23 PoC malware that uses exploit CVE-2021-36934 (improper ACLs on shadow copies) using a fileless red team method on Windows 10/11 with LOLBins, extracting SYSTEM and SAM hives for local NTLM hashes. https://github.com/P1rat3R00t/Why-so-Serious-SAM POC Details
24 Educational lab demonstrating CVE-2021-36934 (HiveNightmare) - Windows LPE via shadow copy ACL misconfiguration. https://github.com/d4yon/CVE-2021-36934-HiveNightmare-Lab POC Details
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III. Intelligence Information for CVE-2021-36934

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Vendor Advisories for CVE-2021-36934 (2)

Exploits & Public PoCs for CVE-2021-36934 (1)

IV. Related Vulnerabilities

Same product: Windows 10 Version 1809
Same vendor: Microsoft

V. Comments for CVE-2021-36934

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