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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_5005106.NASL
HistoryAug 10, 2021 - 12:00 a.m.

KB5005106: Windows 8.1 and Windows Server 2012 R2 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
208

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

0.83

Percentile

98.5%

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)

#%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(152433);
  script_version("1.12");
  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-2021-34533",
    "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"
  );
  script_xref(name:"MSKB", value:"5005036");
  script_xref(name:"MSKB", value:"5005076");
  script_xref(name:"MSKB", value:"5005106");
  script_xref(name:"MSFT", value:"MS21-5005036");
  script_xref(name:"MSFT", value:"MS21-5005076");
  script_xref(name:"MSFT", value:"MS21-5005106");
  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:"KB5005106: Windows 8.1 and Windows Server 2012 R2 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 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)");
  # https://support.microsoft.com/en-us/topic/kb5005036-cumulative-security-update-for-internet-explorer-august-10-2021-621b1edb-b461-4d99-ae3e-5add55e53895
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?0fe73cef");
  # https://support.microsoft.com/en-us/topic/august-10-2021-kb5005076-monthly-rollup-bf677fed-96d9-475e-87c1-a053fa75fef7
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?0e0382f6");
  # https://support.microsoft.com/en-us/topic/august-10-2021-kb5005106-security-only-update-d1ab5a34-55c1-4f66-8776-54a0c3bf40a7
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?57da6a50");
  script_set_attribute(attribute:"solution", value:
"Apply Security Only update KB5005106 or Cumulative Update KB5005076.");
  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_8");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:microsoft:windows_server_2012:r2");
  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(
  '5005106',
  '5005076'
);

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(win81:'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:'6.3', 
                   sp:0,
                   rollup_date:'08_2021',
                   bulletin:bulletin,
                   rollup_kb_list:[5005106, 5005076])
)
{
  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_8cpe:/o:microsoft:windows_8
microsoftwindows_server_2012r2cpe:/o:microsoft:windows_server_2012:r2

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

0.83

Percentile

98.5%