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nessusThis script is Copyright (C) 2021-2024 and is owned by Tenable, Inc. or an Affiliate thereof.SMB_NT_MS21_AUG_5005043.NASL
HistoryAug 10, 2021 - 12:00 a.m.

KB5005043: Windows 10 Version 1607 and Windows Server 2016 Security Update (August 2021)

2021-08-1000:00:00
This script is Copyright (C) 2021-2024 and is owned by Tenable, Inc. or an Affiliate thereof.
www.tenable.com
124

CVSS2

7.5

Attack Vector

NETWORK

Attack Complexity

LOW

Authentication

NONE

Confidentiality Impact

PARTIAL

Integrity Impact

PARTIAL

Availability Impact

PARTIAL

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

CVSS3

9.9

Attack Vector

NETWORK

Attack Complexity

LOW

Privileges Required

LOW

User Interaction

NONE

Scope

CHANGED

Confidentiality Impact

HIGH

Integrity Impact

HIGH

Availability Impact

HIGH

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H

AI Score

8.8

Confidence

High

EPSS

0.81

Percentile

98.4%

The remote Windows host is missing security update 5005043.
It is, therefore, affected by multiple vulnerabilities :

  • 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-2021-34530, CVE-2021-34533, CVE-2021-34534, CVE-2021-34535, CVE-2021-36936, CVE-2021-36937, CVE-2021-36947)

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

  • 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-2021-34487, CVE-2021-34536, CVE-2021-34537)

  • 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)

  • 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, CVE-2021-36938)

#%NASL_MIN_LEVEL 70300
#
# (C) Tenable Network Security, Inc.
#
# The descriptive text and package checks in this plugin were  
# extracted from the Microsoft Security Updates API. The text
# itself is copyright (C) Microsoft Corporation.
#

include('deprecated_nasl_level.inc');
include('compat.inc');

if (description)
{
  script_id(152434);
  script_version("1.11");
  script_set_attribute(attribute:"plugin_modification_date", value:"2024/06/17");

  script_cve_id(
    "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-2021-34487",
    "CVE-2021-34530",
    "CVE-2021-34533",
    "CVE-2021-34534",
    "CVE-2021-34535",
    "CVE-2021-34536",
    "CVE-2021-34537",
    "CVE-2021-36926",
    "CVE-2021-36932",
    "CVE-2021-36933",
    "CVE-2021-36936",
    "CVE-2021-36937",
    "CVE-2021-36938",
    "CVE-2021-36942",
    "CVE-2021-36947"
  );
  script_xref(name:"MSKB", value:"5005043");
  script_xref(name:"MSFT", value:"MS21-5005043");
  script_xref(name:"IAVA", value:"2021-A-0373-S");
  script_xref(name:"IAVA", value:"2021-A-0374-S");
  script_xref(name:"CISA-KNOWN-EXPLOITED", value:"2021/11/17");
  script_xref(name:"CISA-KNOWN-EXPLOITED", value:"2022/04/21");

  script_name(english:"KB5005043: Windows 10 Version 1607 and Windows Server 2016 Security Update (August 2021)");

  script_set_attribute(attribute:"synopsis", value:
"The remote Windows host is affected by multiple vulnerabilities.");
  script_set_attribute(attribute:"description", value:
"The remote Windows host is missing security update 5005043.
It is, therefore, affected by multiple vulnerabilities :

  - 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-2021-34530, CVE-2021-34533,
    CVE-2021-34534, CVE-2021-34535, CVE-2021-36936,
    CVE-2021-36937, CVE-2021-36947)

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

  - 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-2021-34487, CVE-2021-34536,
    CVE-2021-34537)

  - 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)

  - 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, CVE-2021-36938)");
  # https://support.microsoft.com/en-us/topic/august-10-2021-kb5005043-os-build-14393-4583-709d481e-b02a-4eb9-80d9-75c4b8170240
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?e5193663");
  script_set_attribute(attribute:"solution", value:
"Apply Cumulative Update KB5005043.");
  script_set_cvss_base_vector("CVSS2#AV:N/AC:L/Au:N/C:P/I:P/A:P");
  script_set_cvss_temporal_vector("CVSS2#E:H/RL:OF/RC:C");
  script_set_cvss3_base_vector("CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H");
  script_set_cvss3_temporal_vector("CVSS:3.0/E:H/RL:O/RC:C");
  script_set_attribute(attribute:"cvss_score_source", value:"CVE-2021-36936");
  script_set_attribute(attribute:"cvss3_score_source", value:"CVE-2021-26424");

  script_set_attribute(attribute:"exploitability_ease", value:"Exploits are available");
  script_set_attribute(attribute:"exploit_available", value:"true");
  script_set_attribute(attribute:"exploited_by_malware", value:"true");

  script_set_attribute(attribute:"vuln_publication_date", value:"2021/08/10");
  script_set_attribute(attribute:"patch_publication_date", value:"2021/08/10");
  script_set_attribute(attribute:"plugin_publication_date", value:"2021/08/10");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:microsoft:windows_10_1607");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:microsoft:windows_server_2016");
  script_set_attribute(attribute:"stig_severity", value:"I");
  script_end_attributes();

  script_category(ACT_GATHER_INFO);
  script_family(english:"Windows : Microsoft Bulletins");

  script_copyright(english:"This script is Copyright (C) 2021-2024 and is owned by Tenable, Inc. or an Affiliate thereof.");

  script_dependencies("smb_check_rollup.nasl", "smb_hotfixes.nasl", "ms_bulletin_checks_possible.nasl");
  script_require_keys("SMB/MS_Bulletin_Checks/Possible");
  script_require_ports(139, 445, "Host/patch_management_checks");

  exit(0);
}

include('smb_func.inc');
include('smb_hotfixes.inc');
include('smb_hotfixes_fcheck.inc');
include('smb_reg_query.inc');

get_kb_item_or_exit('SMB/MS_Bulletin_Checks/Possible');

bulletin = 'MS21-08';
kbs = make_list(
  '5005043'
);

if (get_kb_item('Host/patch_management_checks')) hotfix_check_3rd_party(bulletin:bulletin, kbs:kbs, severity:SECURITY_HOLE);

get_kb_item_or_exit('SMB/Registry/Enumerated');
get_kb_item_or_exit('SMB/WindowsVersion', exit_code:1);

if (hotfix_check_sp_range(win10:'0') <= 0) audit(AUDIT_OS_SP_NOT_VULN);

share = hotfix_get_systemdrive(as_share:TRUE, exit_on_fail:TRUE);
if (!is_accessible_share(share:share)) audit(AUDIT_SHARE_FAIL, share);

if (
  smb_check_rollup(os:'10', 
                   sp:0,
                   os_build:14393,
                   rollup_date:'08_2021',
                   bulletin:bulletin,
                   rollup_kb_list:[5005043])
)
{
  replace_kb_item(name:'SMB/Missing/'+bulletin, value:TRUE);
  hotfix_security_hole();
  hotfix_check_fversion_end();
  exit(0);
}
else
{
  hotfix_check_fversion_end();
  audit(AUDIT_HOST_NOT, hotfix_get_audit_report());
}
VendorProductVersionCPE
microsoftwindows_10_1607cpe:/o:microsoft:windows_10_1607
microsoftwindows_server_2016cpe:/o:microsoft:windows_server_2016

References

CVSS2

7.5

Attack Vector

NETWORK

Attack Complexity

LOW

Authentication

NONE

Confidentiality Impact

PARTIAL

Integrity Impact

PARTIAL

Availability Impact

PARTIAL

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

CVSS3

9.9

Attack Vector

NETWORK

Attack Complexity

LOW

Privileges Required

LOW

User Interaction

NONE

Scope

CHANGED

Confidentiality Impact

HIGH

Integrity Impact

HIGH

Availability Impact

HIGH

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H

AI Score

8.8

Confidence

High

EPSS

0.81

Percentile

98.4%