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.
5.7	$0-$5k	0.00

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.

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 highly functional. 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.

Productinfo

Type

• Operating System

Vendor

• Microsoft

Name

• Windows

Version

• 10
• 11

License

• commercial

CPE 2.3info

• 🔍
• 🔍
• 🔍

CPE 2.2info

• 🔍
• 🔍
• 🔍

CVSSv4info

VulDB CVSS-B Score: 🔍
VulDB CVSS-BT Score: 🔍
VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 6.0
VulDB Meta Temp Score: 5.7

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

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

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: 🔍

Exploitinginfo

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

Local: No
Remote: Yes

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

EPSS Score: 🔍
EPSS Percentile: 🔍

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

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

Timelineinfo

07/20/2021 🔍
07/20/2021 +0 days 🔍
07/21/2021 +0 days 🔍
04/22/2024 +1006 days 🔍

Sourcesinfo

Vendor: microsoft.com
Product: microsoft.com

Advisory: twitter.com
Status: Confirmed
Confirmation: 🔍

CVE: CVE-2021-36934 (🔍)
scip Labs: https://www.scip.ch/en/?labs.20161215

Entryinfo

Created: 07/20/2021 07:10
Updated: 04/22/2024 20:41
Changes: 07/20/2021 07:10 (41), 07/20/2021 14:20 (4), 07/20/2021 14:21 (2), 07/21/2021 09:46 (1), 07/21/2021 10:51 (16), 07/22/2021 09:15 (11), 07/22/2021 09:19 (4), 07/22/2021 09:21 (3), 04/22/2024 20:41 (28)
Complete: 🔍
Committer: vuln_info, misc

Discussion

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