Windows SeriousSAM HiveNightmare Registry Read Vulnerability

high Nessus Plugin ID 152100
New! Plugin Severity Now Using CVSS v3

The calculated severity for Plugins has been updated to use CVSS v3 by default. Plugins that do not have a CVSS v3 score will fall back to CVSS v2 for calculating severity. Severity display preferences can be toggled in the settings dropdown.

Synopsis

The remote Windows host is affected by an elevation of privilege 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.

Solution

Per the vendor advisory, restrict access to the contents of %windir%\system32\config and Delete Volume Shadow Copy Service (VSS) shadow copies.

See Also

http://www.nessus.org/u?1873e7da

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2021-36934

https://www.kb.cert.org/vuls/id/506989

Plugin Details

Severity: High

ID: 152100

File Name: smb_nt_serious_sam_check.nbin

Version: 1.8

Type: local

Agent: windows

Family: Windows

Published: 7/27/2021

Updated: 9/16/2021

Dependencies: smb_hotfixes.nasl, smb_enum_services.nasl

Risk Information

CVSS Score Source: CVE-2021-36934

VPR

Risk Factor: Critical

Score: 9.8

CVSS v2

Risk Factor: Medium

Base Score: 4.6

Temporal Score: 4

Vector: AV:L/AC:L/Au:N/C:P/I:P/A:P

Temporal Vector: E:H/RL:OF/RC:C

CVSS v3

Risk Factor: High

Base Score: 7.8

Temporal Score: 7.5

Vector: CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Temporal Vector: E:H/RL:O/RC:C

Vulnerability Information

CPE: cpe:/o:microsoft:windows

Required KB Items: SMB/login, SMB/password, SMB/Services/Enumerated

Exploit Available: true

Exploit Ease: Exploits are available

Patch Publication Date: 7/20/2021

Vulnerability Publication Date: 7/20/2021

Reference Information

CVE: CVE-2021-36934

IAVA: 2021-A-0374-S