KB5005106: Windows Server 2012 R2 Security Update (August 2021)

critical Nessus Plugin ID 152433
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 multiple vulnerabilities.

Description

The remote Windows host is missing security update 5005106 or cumulative update 5005076. It is, therefore, affected by multiple vulnerabilities :

- An elevation of privilege vulnerability. An attacker can exploit this to gain elevated privileges.
(CVE-2021-26425, CVE-2021-26426, CVE-2021-34483, CVE-2021-34484, CVE-2021-34537, CVE-2021-36927)

- A session spoofing vulnerability exists. An attacker can exploit this to perform actions with the privileges of another user. (CVE-2021-36942)

- A remote code execution vulnerability. An attacker can exploit this to bypass authentication and execute unauthorized arbitrary commands. (CVE-2021-26424, CVE-2021-26432, CVE-2021-34533, CVE-2021-34535, CVE-2021-36936, CVE-2021-36937, CVE-2021-36947)

- An information disclosure vulnerability. An attacker can exploit this to disclose potentially sensitive information. (CVE-2021-26433, CVE-2021-36926, CVE-2021-36932, CVE-2021-36933)

- An memory corruption vulnerability exists. An attacker can exploit this to corrupt the memory and cause unexpected behaviors within the system/application.
(CVE-2021-34480)

Solution

Apply Security Only update KB5005106 or Cumulative Update KB5005076.

See Also

http://www.nessus.org/u?0fe73cef

http://www.nessus.org/u?0e0382f6

http://www.nessus.org/u?57da6a50

Plugin Details

Severity: Critical

ID: 152433

File Name: smb_nt_ms21_aug_5005106.nasl

Version: 1.8

Type: local

Agent: windows

Published: 8/10/2021

Updated: 11/30/2021

Dependencies: smb_check_rollup.nasl, smb_hotfixes.nasl, ms_bulletin_checks_possible.nasl

Risk Information

CVSS Score Source: CVE-2021-36936

VPR

Risk Factor: Critical

Score: 9.8

CVSS v2

Risk Factor: High

Base Score: 7.5

Temporal Score: 6.5

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

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

CVSS v3

Risk Factor: Critical

Base Score: 9.8

Temporal Score: 9.4

Vector: CVSS:3.0/AV:N/AC:L/PR:N/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/MS_Bulletin_Checks/Possible

Exploit Available: true

Exploit Ease: Exploits are available

Patch Publication Date: 8/10/2021

Vulnerability Publication Date: 8/10/2021

Reference Information

CVE: CVE-2021-26424, CVE-2021-26425, CVE-2021-26426, CVE-2021-26432, CVE-2021-26433, CVE-2021-34480, CVE-2021-34481, CVE-2021-34483, CVE-2021-34484, CVE-2021-34533, CVE-2021-34535, CVE-2021-34537, CVE-2021-36926, CVE-2021-36927, CVE-2021-36932, CVE-2021-36933, CVE-2021-36936, CVE-2021-36937, CVE-2021-36942, CVE-2021-36947

MSKB: 5005036, 5005076, 5005106

MSFT: MS21-5005036, MS21-5005076, MS21-5005106

IAVA: 2021-A-0373-S, 2021-A-0374-S