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nessusThis script is Copyright (C) 2021-2023 and is owned by Tenable, Inc. or an Affiliate thereof.SMB_NT_MS21_JUN_OFFICE.NASL
HistoryJun 08, 2021 - 12:00 a.m.

Security Updates for Microsoft Office Products (June 2021)

2021-06-0800:00:00
This script is Copyright (C) 2021-2023 and is owned by Tenable, Inc. or an Affiliate thereof.
www.tenable.com
79

8.2 High

AI Score

Confidence

High

The Microsoft Office Products are missing security updates. It is, therefore, affected by multiple vulnerabilities :

  • Microsoft Excel remote code execution vulnerability. An attacker can exploit this to bypass authentication and execute unauthorized arbitrary commands. (CVE-2021-31939)

  • Microsoft Office Graphics remote code execution vulnerability. An attacker can exploit this to bypass authentication and execute unauthorized arbitrary commands. (CVE-2021-31940, CVE-2021-31941) Note that Nessus has not tested for these issues but has instead relied only on the application’s self-reported version number.

#%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(150356);
  script_version("1.9");
  script_set_attribute(attribute:"plugin_modification_date", value:"2023/12/27");

  script_cve_id(
    "CVE-2021-31939",
    "CVE-2021-31940",
    "CVE-2021-31941",
    "CVE-2021-31949"
  );
  script_xref(name:"MSKB", value:"5001950");
  script_xref(name:"MSKB", value:"5001955");
  script_xref(name:"MSKB", value:"5001951");
  script_xref(name:"MSKB", value:"5001953");
  script_xref(name:"MSFT", value:"MS21-5001950");
  script_xref(name:"MSFT", value:"MS21-5001955");
  script_xref(name:"MSFT", value:"MS21-5001951");
  script_xref(name:"MSFT", value:"MS21-5001953");
  script_xref(name:"IAVA", value:"2021-A-0275-S");

  script_name(english:"Security Updates for Microsoft Office Products (June 2021)");

  script_set_attribute(attribute:"synopsis", value:
"The Microsoft Office Products are affected by multiple vulnerabilities.");
  script_set_attribute(attribute:"description", value:
"The Microsoft Office Products are missing security updates. It is, therefore, affected by multiple vulnerabilities :

  - Microsoft Excel remote code execution vulnerability. An attacker can exploit this to bypass authentication and
    execute unauthorized arbitrary commands. (CVE-2021-31939)

  - Microsoft Office Graphics remote code execution vulnerability. An attacker can exploit this to bypass authentication
    and execute unauthorized arbitrary commands. (CVE-2021-31940, CVE-2021-31941)
    
Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version
number.");
  script_set_attribute(attribute:"see_also", value:"https://support.microsoft.com/en-us/help/5001950");
  script_set_attribute(attribute:"see_also", value:"https://support.microsoft.com/en-us/help/5001951");
  script_set_attribute(attribute:"see_also", value:"https://support.microsoft.com/en-us/help/5001953");
  script_set_attribute(attribute:"see_also", value:"https://support.microsoft.com/en-us/help/5001955");
  script_set_attribute(attribute:"solution", value:
"Microsoft has released the following security updates to address this issue:
  -KB5001950
  -KB5001951
  -KB5001953
  -KB5001955
  
For Office 365, Office 2016 C2R, or Office 2019, ensure automatic updates are enabled or open any office app and
manually perform an update.");
  script_set_cvss_base_vector("CVSS2#AV:N/AC:M/Au:N/C:P/I:P/A:P");
  script_set_cvss_temporal_vector("CVSS2#E:F/RL:OF/RC:C");
  script_set_cvss3_base_vector("CVSS:3.0/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H");
  script_set_cvss3_temporal_vector("CVSS:3.0/E:F/RL:O/RC:C");
  script_set_attribute(attribute:"cvss_score_source", value:"CVE-2021-31949");
  script_set_attribute(attribute:"cvss3_score_source", value:"CVE-2021-31941");

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

  script_set_attribute(attribute:"vuln_publication_date", value:"2021/06/08");
  script_set_attribute(attribute:"patch_publication_date", value:"2021/06/08");
  script_set_attribute(attribute:"plugin_publication_date", value:"2021/06/08");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"cpe:/a:microsoft:office");
  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("office_installed.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');

var bulletin = 'MS21-06';
var kbs = make_list(
  '5001950',
  '5001955',
  '5001951',
  '5001953'
);

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

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

var vuln = FALSE;
var port = kb_smb_transport();

var office_vers = hotfix_check_office_version();
var office_sp, prod, path, kb, file, version;

# Office 2013 SP1
if (office_vers['15.0'])
{
  office_sp = get_kb_item('SMB/Office/2013/SP');
  if (!isnull(office_sp) && office_sp == 1)
  {
    prod = 'Microsoft Office 2013 SP1';

    path = hotfix_get_officeprogramfilesdir(officever:'15.0');
    path = hotfix_append_path(path:path, value:'Microsoft Office\\Office15');
    kb = '5001955';
    file = 'graph.exe';
    version = '15.0.5353.1000';
    if (hotfix_check_fversion(file:file, version:version, path:path, kb:kb, bulletin:bulletin, product:prod) == HCF_OLDER )
      vuln = TRUE;

    path = hotfix_get_officecommonfilesdir(officever:'15.0');
    path = hotfix_append_path(path:path, value:'Microsoft Shared\\Office15');
    kb = '5001953';
    file = 'mso.dll';
    version = '15.0.5353.1000';
    if (hotfix_check_fversion(file:file, version:version, path:path, kb:kb, bulletin:bulletin, product:prod) == HCF_OLDER )
      vuln = TRUE;
  }
}

# Office 2016
if (office_vers['16.0'])
{
  office_sp = get_kb_item('SMB/Office/2016/SP');
  if (!isnull(office_sp) && office_sp == 0)
  {
    prod = 'Microsoft Office 2016';
    
    # MSI mso.dll
    path = hotfix_get_officecommonfilesdir(officever:'16.0');
    path = hotfix_append_path(path:path, value:'Microsoft Shared\\Office16');
    if (hotfix_check_fversion(file:'mso.dll', version:'16.0.5173.1000', channel:'MSI', channel_product:'Office', path:path, kb:'5001950', bulletin:bulletin, product:prod) == HCF_OLDER)
      vuln = TRUE;
    
    # MSI graph.exe
    path = hotfix_get_officeprogramfilesdir(officever:'16.0');
    path = hotfix_append_path(path:path, value:'Microsoft Office\\Office16');
    if (hotfix_check_fversion(file:'graph.exe', version:'16.0.5173.1000', channel:'MSI', channel_product:'Office', path:path, kb:'5001951', bulletin:bulletin, product:prod) == HCF_OLDER)
      vuln = TRUE;
  }
}

if (vuln)
{
  replace_kb_item(name:'SMB/Missing/'+bulletin, value:TRUE);
  hotfix_security_warning();
  hotfix_check_fversion_end();
  exit(0);
}
else
{
  hotfix_check_fversion_end();
  audit(AUDIT_HOST_NOT, 'affected');
}
VendorProductVersion
microsoftoffice

8.2 High

AI Score

Confidence

High

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