Detections
Analytics
KB5004442: Windows DCOM Server Security Feature Bypass Registry Check (CVE-2021-26414)
medium Nessus Plugin ID 170626
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Synopsis
The remote Windows host DCOM hardening measure is disabled.Description
The remote Windows DCOM Server may be in a vulnerable state to exploitation by having the HKLM\Software\Microsoft\Ole\AppCompat\RequireIntegrityActivationAuthenticationLevel registry value set to 0. Hardening changes in DCOM were required for CVE-2021-26414 and were implemented in 2 phases on June 8, 2021 and June 14, 2022 as described in KB5004442. Without the March 2023 Microsoft upgrade (phase 3), DCOM hardening can be manually disabled by setting this registry value to 0 on the server side to help mitigate compatibility issues. This presents a vulnerability risk and should be avoided. With the March 2023 update, DCOM hardening is enabled by default, and is no longer affected by the registry setting.Solution
Update the DWORD registry value RequireIntegrityActivationAuthenticationLevel under: HKEY_LOCAL_MACHINE\Software\Microsoft\Ole\AppCompat to 1 to enable DCOM hardeningSee Also
Plugin Details
Severity: Medium
ID: 170626
File Name: windows_DCOM_hardening_reg_check.nasl
Version: 1.3
Type: local
Agent: windows
Family: Windows
Published: 1/25/2023
Updated: 3/22/2024
Supported Sensors: Nessus Agent, Nessus
Risk Information
VPR
Risk Factor: Medium
Score: 4.4
CVSS v2
Risk Factor: Medium
Base Score: 4.3
Temporal Score: 3.6
Vector: CVSS2#AV:N/AC:M/Au:N/C:N/I:P/A:N
CVSS Score Source: CVE-2021-26414
CVSS v3
Risk Factor: Medium
Base Score: 4.8
Temporal Score: 4.5
Vector: CVSS:3.0/AV:N/AC:H/PR:L/UI:R/S:U/C:N/I:H/A:N
Temporal Vector: CVSS:3.0/E:F/RL:O/RC:C
Vulnerability Information
CPE: cpe:/o:microsoft:windows
Required KB Items: SMB/Registry/Enumerated
Exploit Available: true
Exploit Ease: Exploits are available
Patch Publication Date: 6/8/2021
Vulnerability Publication Date: 6/8/2021
Reference Information
CVE: CVE-2021-26414