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nessusThis script is Copyright (C) 2021-2022 and is owned by Tenable, Inc. or an Affiliate thereof.SMB_NT_MS21_MAR_5000841.NASL
HistoryMar 09, 2021 - 12:00 a.m.

KB5000851: Windows 7 and Windows Server 2008 R2 March 2021 Security Update

2021-03-0900:00:00
This script is Copyright (C) 2021-2022 and is owned by Tenable, Inc. or an Affiliate thereof.
www.tenable.com
23

The remote Windows host is missing security update 5000851 or cumulative update 5000841. 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-2021-26861, CVE-2021-26877, CVE-2021-26881, CVE-2021-26893, CVE-2021-26894, CVE-2021-26895, CVE-2021-26897)

  • An information disclosure vulnerability. An attacker can exploit this to disclose potentially sensitive information. (CVE-2021-24107, CVE-2021-26869)

  • An elevation of privilege vulnerability. An attacker can exploit this to gain elevated privileges.
    (CVE-2021-1640, CVE-2021-26862, CVE-2021-26872, CVE-2021-26873, CVE-2021-26875, CVE-2021-26878, CVE-2021-26882, CVE-2021-26898, CVE-2021-26899, CVE-2021-26901, CVE-2021-27077)

  • An memory corruption vulnerability exists. An attacker can exploit this to corrupt the memory and cause unexpected behaviors within the system/application.
    (CVE-2021-26411)

  • A denial of service (DoS) vulnerability. An attacker can exploit this issue to cause the affected component to deny system or application services. (CVE-2021-26896, CVE-2021-27063)

#
# (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('compat.inc');

if (description)
{
  script_id(147231);
  script_version("1.10");
  script_set_attribute(attribute:"plugin_modification_date", value:"2022/12/05");

  script_cve_id(
    "CVE-2021-1640",
    "CVE-2021-24107",
    "CVE-2021-26411",
    "CVE-2021-26861",
    "CVE-2021-26862",
    "CVE-2021-26869",
    "CVE-2021-26872",
    "CVE-2021-26873",
    "CVE-2021-26875",
    "CVE-2021-26877",
    "CVE-2021-26878",
    "CVE-2021-26881",
    "CVE-2021-26882",
    "CVE-2021-26893",
    "CVE-2021-26894",
    "CVE-2021-26895",
    "CVE-2021-26896",
    "CVE-2021-26897",
    "CVE-2021-26898",
    "CVE-2021-26899",
    "CVE-2021-26901",
    "CVE-2021-27063",
    "CVE-2021-27077"
  );
  script_xref(name:"MSKB", value:"5000841");
  script_xref(name:"MSKB", value:"5000851");
  script_xref(name:"MSFT", value:"MS21-5000841");
  script_xref(name:"MSFT", value:"MS21-5000851");
  script_xref(name:"IAVA", value:"2021-A-0130-S");
  script_xref(name:"IAVA", value:"2021-A-0134-S");
  script_xref(name:"CISA-KNOWN-EXPLOITED", value:"2021/11/17");
  script_xref(name:"CEA-ID", value:"CEA-2021-0015");

  script_name(english:"KB5000851: Windows 7 and Windows Server 2008 R2 March 2021 Security Update");

  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 5000851
or cumulative update 5000841. 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-2021-26861,
    CVE-2021-26877, CVE-2021-26881, CVE-2021-26893,
    CVE-2021-26894, CVE-2021-26895, CVE-2021-26897)

  - An information disclosure vulnerability. An attacker can
    exploit this to disclose potentially sensitive
    information. (CVE-2021-24107, CVE-2021-26869)

  - An elevation of privilege vulnerability. An attacker can
    exploit this to gain elevated privileges.
    (CVE-2021-1640, CVE-2021-26862, CVE-2021-26872,
    CVE-2021-26873, CVE-2021-26875, CVE-2021-26878,
    CVE-2021-26882, CVE-2021-26898, CVE-2021-26899,
    CVE-2021-26901, CVE-2021-27077)

  - An memory corruption vulnerability exists. An attacker
    can exploit this to corrupt the memory and cause
    unexpected behaviors within the system/application.
    (CVE-2021-26411)

  - A denial of service (DoS) vulnerability. An attacker can
    exploit this issue to cause the affected component to
    deny system or application services. (CVE-2021-26896,
    CVE-2021-27063)");
  # https://support.microsoft.com/en-us/topic/march-9-2021-kb5000851-security-only-update-9e198918-a6d6-46d3-8cfb-bd2b1e2ecb99
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?7cce9359");
  # https://support.microsoft.com/en-us/topic/march-9-2021-kb5000841-monthly-rollup-3a2cced1-f436-40c3-a8a1-645f86759088
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?8c5851d4");
  script_set_attribute(attribute:"solution", value:
"Apply Security Only update KB5000851 or Cumulative Update KB5000841.");
  script_set_cvss_base_vector("CVSS2#AV:N/AC:L/Au:N/C:C/I:C/A:C");
  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:N/UI:N/S:U/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-2021-26897");

  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:"exploit_framework_canvas", value:"true");
  script_set_attribute(attribute:"canvas_package", value:"CANVAS");

  script_set_attribute(attribute:"vuln_publication_date", value:"2021/03/08");
  script_set_attribute(attribute:"patch_publication_date", value:"2021/03/08");
  script_set_attribute(attribute:"plugin_publication_date", value:"2021/03/09");

  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) 2021-2022 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 = 'MS21-03';
kbs = make_list(
  '5000841',
  '5000851'
);

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(win7:'1') <= 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:'6.1', 
                   sp:1,
                   rollup_date:'03_2021',
                   bulletin:bulletin,
                   rollup_kb_list:[5000841, 5000851])
)
{
  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

References

Related for SMB_NT_MS21_MAR_5000841.NASL