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nessusThis script is Copyright (C) 2021-2023 and is owned by Tenable, Inc. or an Affiliate thereof.SMB_NT_MS21_AUG_5005095.NASL
HistoryAug 10, 2021 - 12:00 a.m.

KB5005095: Windows Server 2008 Security Update (August 2021)

2021-08-1000:00:00
This script is Copyright (C) 2021-2023 and is owned by Tenable, Inc. or an Affiliate thereof.
www.tenable.com
99

8.9 High

AI Score

Confidence

Low

The remote Windows host is missing security update 5005095 or cumulative update 5005090. 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-2021-34533, 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-2021-34483, CVE-2021-34484, CVE-2021-36927)

#%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(152425);
  script_version("1.10");
  script_set_attribute(attribute:"plugin_modification_date", value:"2023/12/29");

  script_cve_id(
    "CVE-2021-26424",
    "CVE-2021-26425",
    "CVE-2021-34481",
    "CVE-2021-34483",
    "CVE-2021-34484",
    "CVE-2021-34533",
    "CVE-2021-36927",
    "CVE-2021-36936",
    "CVE-2021-36937",
    "CVE-2021-36942",
    "CVE-2021-36947"
  );
  script_xref(name:"MSKB", value:"5005095");
  script_xref(name:"MSKB", value:"5005090");
  script_xref(name:"MSFT", value:"MS21-5005095");
  script_xref(name:"MSFT", value:"MS21-5005090");
  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:"KB5005095: Windows Server 2008 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 5005095
or cumulative update 5005090. 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-2021-34533, 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-2021-34483, CVE-2021-34484,
    CVE-2021-36927)");
  # https://support.microsoft.com/en-us/topic/august-10-2021-kb5005095-security-only-update-a324fdbb-ce90-4c4d-8d9d-e9f2f2a57e0e
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?de72daa6");
  # https://support.microsoft.com/en-us/topic/august-10-2021-kb5005090-monthly-rollup-8feea9cd-25f9-41ef-b8e1-815211dc4e6c
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?910509c6");
  script_set_attribute(attribute:"solution", value:
"Apply Security Only update KB5005095 or Cumulative Update KB5005090.");
  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");
  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) 2021-2023 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(
  '5005095',
  '5005090'
);

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(vista:'2') <= 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:'6.0', 
                   sp:2,
                   rollup_date:'08_2021',
                   bulletin:bulletin,
                   rollup_kb_list:[5005095, 5005090])
)
{
  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());
}
VendorProductVersion
microsoftwindows