VDB-178898 · CVE-2021-36934 · GCVE-0-2021-36934

Microsoft Windows 10/11 Volume Shadow Copy SAM SeriousSAM/HiveNightmare permission

CVSS Meta Temp Score CVSS is a standardized scoring system to determine possibilities of attacks. The Temp Score considers temporal factors like disclosure, exploit and countermeasures. The unique Meta Score calculates the average score of different sources to provide a normalized scoring system.	Current Exploit Price (≈) Our analysts are monitoring exploit markets and are in contact with vulnerability brokers. The range indicates the observed or calculated exploit price to be seen on exploit markets. A good indicator to understand the monetary effort required for and the popularity of an attack.	CTI Interest Score Our Cyber Threat Intelligence team is monitoring different web sites, mailing lists, exploit markets and social media networks. The CTI Interest Score identifies the interest of attackers and the security community for this specific vulnerability in real-time. A high score indicates an elevated risk to be targeted for this vulnerability.
6.8	$0-$5k	0.00

Summaryinfo

A vulnerability was found in Microsoft Windows 10/11. It has been declared as very critical. Impacted is an unknown function of the file C:\Windows\System32\config\SAM of the component Volume Shadow Copy. Such manipulation leads to permission (SeriousSAM/HiveNightmare). This vulnerability is listed as CVE-2021-36934. The attack may be performed from remote. In addition, an exploit is available. Modifying the configuration settings is advised.

Detailsinfo

A vulnerability was found in Microsoft Windows 10/11 (Operating System) and classified as critical. Affected by this issue is some unknown processing of the file C:\Windows\System32\config\SAM of the component Volume Shadow Copy. The manipulation with an unknown input leads to a permission vulnerability (SeriousSAM/HiveNightmare). Using CWE to declare the problem leads to CWE-275. Impacted is confidentiality. CVE summarizes:

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>.

The weakness was presented 07/20/2021. The advisory is available at twitter.com. This vulnerability is handled as CVE-2021-36934. The attack may be launched remotely. Technical details as well as a public exploit are known. This vulnerability is assigned to T1222 by the MITRE ATT&CK project.

A public exploit has been developed by Kevin Beaumont (GossiTheDog) in C++ and been published 1 days after the advisory. The exploit is available at github.com. It is declared as attacked. As 0-day the estimated underground price was around $25k-$100k. This issue was added on 02/10/2022 to the CISA Known Exploited Vulnerabilities Catalog with a due date of 02/24/2022:

Apply updates per vendor instructions.

It is possible to mitigate the problem by applying the configuration setting icacls %windir%\system32\config\*.* /inheritance:e.

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Productinfo

Type

Operating System

Vendor

Microsoft

Name

Windows

Version

License

commercial

Website

Vendor: https://www.microsoft.com/
Product: https://www.microsoft.com/en-us/windows

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 6.9
VulDB Meta Temp Score: 6.8

VulDB Base Score: 4.3
VulDB Temp Score: 4.2
VulDB Vector: 🔍
VulDB Reliability: 🔍

Vendor Base Score (Microsoft): 7.8
Vendor Vector (Microsoft): 🔍

NVD Base Score: 7.8
NVD Vector: 🔍

CNA Base Score: 7.8
CNA Vector: 🔍

CVSSv2info

AV	AC	Au	C	I	A
💳	💳	💳	💳	💳	💳
💳	💳	💳	💳	💳	💳
💳	💳	💳	💳	💳	💳

Vector	Complexity	Authentication	Confidentiality	Integrity	Availability
Unlock	Unlock	Unlock	Unlock	Unlock	Unlock
Unlock	Unlock	Unlock	Unlock	Unlock	Unlock
Unlock	Unlock	Unlock	Unlock	Unlock	Unlock

VulDB Base Score: 🔍
VulDB Temp Score: 🔍
VulDB Reliability: 🔍

NVD Base Score: 🔍

Exploitinginfo

Name: SeriousSAM/HiveNightmare
Class: Permission / SeriousSAM/HiveNightmare
CWE: CWE-275 / CWE-266
CAPEC: 🔍
ATT&CK: 🔍

Physical: Partially
Local: Yes
Remote: Yes

Availability: 🔍
Access: Public
Status: Attacked
Author: Kevin Beaumont (GossiTheDog)
Programming Language: 🔍
Download: 🔍

EPSS Score: 🔍
EPSS Percentile: 🔍

KEV Added: 🔍
KEV Due: 🔍
KEV Remediation: 🔍
KEV Ransomware: 🔍
KEV Notice: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

0-Day	Unlock	Unlock	Unlock	Unlock
Today	Unlock	Unlock	Unlock	Unlock

Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Config
Status: 🔍

0-Day Time: 🔍
Exploit Delay Time: 🔍

Config: icacls %windir%\system32\config\*.* /inheritance:e
Workaround: Delete Volume Shadow Copy Service Shadow Copies