Vulnerabilities > CVE-2020-0855 - Improper Restriction of Operations within the Bounds of a Memory Buffer vulnerability in Microsoft Office and Office 365 Proplus

#
# (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(134408);
  script_version("1.5");
  script_set_attribute(attribute:"plugin_modification_date", value:"2020/04/17");

  script_cve_id(
    "CVE-2020-0850",
    "CVE-2020-0851",
    "CVE-2020-0852",
    "CVE-2020-0855",
    "CVE-2020-0892"
  );

  script_name(english:"Security Updates for Microsoft Office Products (March 2020) (macOS)");

  script_set_attribute(attribute:"synopsis", value:
"An application installed on the remote macOS or Mac OS X host is affected by multiple vulnerabilities.");
  script_set_attribute(attribute:"description", value:
"The Microsoft Office application installed on the remote macOS or Mac OS X host is missing a security update. It is,
therefore, affected by multiple remote code execution vulnerabilities in Microsoft Word software due to failure to
properly handle objects in memory. An attacker could use a specially crafted file to perform actions in the security 
context of the current user. To exploit this issue, an attacker would have to convince the user to click a link, 
typically by way of an enticement in an email or Instant Messenger message, and then convince the user to open the 
specially crafted file.");
  # https://docs.microsoft.com/en-us/officeupdates/release-notes-office-for-mac#march-10-2020
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?267d9c1d");
  # https://docs.microsoft.com/en-us/officeupdates/update-history-office-for-mac#march-10-2020
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?07e51711");
  # https://docs.microsoft.com/en-us/officeupdates/release-notes-office-2016-mac#march-10-2020
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?64424563");
  script_set_attribute(attribute:"solution", value:
"Microsoft has released a set of patches for Microsoft Office for Mac.");
  script_set_cvss_base_vector("CVSS2#AV:N/AC:M/Au:N/C:C/I:C/A:C");
  script_set_cvss_temporal_vector("CVSS2#E:U/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:U/RL:O/RC:C");
  script_set_attribute(attribute:"cvss_score_source", value:"CVE-2020-0892");

  script_set_attribute(attribute:"exploitability_ease", value:"No known exploits are available");

  script_set_attribute(attribute:"vuln_publication_date", value:"2020/03/10");
  script_set_attribute(attribute:"patch_publication_date", value:"2020/03/10");
  script_set_attribute(attribute:"plugin_publication_date", value:"2020/03/11");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:apple:mac_os_x");
  script_set_attribute(attribute:"cpe", value:"cpe:/a:microsoft:office");
  script_set_attribute(attribute:"cpe", value:"cpe:/a:microsoft:excel");
  script_set_attribute(attribute:"cpe", value:"cpe:/a:microsoft:word");
  script_set_attribute(attribute:"cpe", value:"cpe:/a:microsoft:powerpoint");
  script_set_attribute(attribute:"cpe", value:"cpe:/a:microsoft:outlook");
  script_set_attribute(attribute:"cpe", value:"cpe:/a:microsoft:onenote");
  script_end_attributes();

  script_category(ACT_GATHER_INFO);
  script_family(english:"MacOS X Local Security Checks");

  script_copyright(english:"This script is Copyright (C) 2020 and is owned by Tenable, Inc. or an Affiliate thereof.");

  script_dependencies("macosx_office_installed.nbin");
  script_require_keys("Host/MacOSX/Version");
  script_require_ports("installed_sw/Microsoft Word", "installed_sw/Microsoft Excel", "installed_sw/Microsoft PowerPoint", "installed_sw/Microsoft OneNote", "installed_sw/Microsoft Outlook");

  exit(0);
}

include('audit.inc');
include('global_settings.inc');
include('misc_func.inc');
include('install_func.inc');

os = get_kb_item_or_exit('Host/MacOSX/Version');
apps = make_list(
  'Microsoft Word',
  'Microsoft Excel',
  'Microsoft PowerPoint',
  'Microsoft OneNote',
  'Microsoft Outlook'
);
report = '';

#2016
min_ver_16 = '16';
fix_ver_16 = '16.16.20';
fix_disp_16 = '16.16.20 (20030700)';

#2019
min_ver_19 = '16.17.0';
fix_ver_19 = '16.35';
fix_disp_19 = '16.35 (20030802)';

foreach app (apps)
{
  installs = get_installs(app_name:app);
  if (isnull(installs[1]))
    continue;

  foreach install (installs[1])
  {
    version = install['version'];

    if (ver_compare(ver:version, minver:min_ver_19, fix:fix_ver_19, strict:FALSE) < 0)
    {
      app_label = app + ' for Mac 2019';
      report +=
        '\n\n  Product           : ' + app_label +
        '\n  Installed version : ' + version +
        '\n  Fixed version     : ' + fix_disp_19;
    }
    else if (ver_compare(ver:version, minver:min_ver_16, fix:fix_ver_16, strict:FALSE) < 0)
    {
      app_label = app + ' for Mac 2016';
      report +=
        '\n\n  Product           : ' + app_label +
        '\n  Installed version : ' + version +
        '\n  Fixed version     : ' + fix_disp_16;
    }
  }
}
if (empty(report))
  audit(AUDIT_HOST_NOT, 'affected');

if (os =~ "^Mac OS X 10\.[0-9](\.|$)")
  report += '\n  Note              : Update will require Mac OS X 10.10.0 or later.\n';

security_report_v4(severity:SECURITY_HOLE, port:0, extra:report);

#
# (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(134416);
  script_version("1.7");
  script_set_attribute(attribute:"plugin_modification_date", value:"2020/06/03");

  script_cve_id(
    "CVE-2020-0850",
    "CVE-2020-0851",
    "CVE-2020-0852",
    "CVE-2020-0855",
    "CVE-2020-0892",
    "CVE-2020-7080",
    "CVE-2020-7081",
    "CVE-2020-7082",
    "CVE-2020-7083",
    "CVE-2020-7084",
    "CVE-2020-7085"
  );
  script_xref(name:"MSKB", value:"4484237");
  script_xref(name:"MSFT", value:"MS20-4484237");

  script_name(english:"Security Updates for Microsoft Office Products (March 2020)");

  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 :

  - A remote code execution vulnerability exists in
    Microsoft Word software when it fails to properly handle
    objects in memory. An attacker who successfully
    exploited the vulnerability could use a specially
    crafted file to perform actions in the security context
    of the current user. For example, the file could then
    take actions on behalf of the logged-on user with the
    same permissions as the current user.  (CVE-2020-0850,
    CVE-2020-0851, CVE-2020-0855, CVE-2020-0892)

  - A remote code execution vulnerability exists in
    Microsoft Word software when it fails to properly handle
    objects in memory. An attacker who successfully
    exploited the vulnerability could use a specially
    crafted file to perform actions in the security context
    of the current user. For example, the file could then
    take actions on behalf of the logged-on user with the
    same permissions as the current user.  (CVE-2020-0852)

  - Remote code execution vulnerabilities exist in Microsoft 
    products that utilize the FBX library when processing 
    specially crafted 3D content. An attacker who 
    successfully exploited these vulnerabilities could gain 
    the same user rights as the local user. (CVE-2020-7080, 
    CVE-2020-7081, CVE-2020-7082, CVE-2020-7083, 
    CVE-2020-7084, CVE-2020-7085)");
  # https://support.microsoft.com/en-us/help/4484237/security-update-for-office-2010-march-10-2020
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?e59db2e7");
  script_set_attribute(attribute:"solution", value:
"Microsoft has released KB4484237 to address this issue for 
Office 2010. And 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:C/I:C/A:C");
  script_set_cvss_temporal_vector("CVSS2#E:U/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:U/RL:O/RC:C");
  script_set_attribute(attribute:"cvss_score_source", value:"CVE-2020-0892");

  script_set_attribute(attribute:"exploitability_ease", value:"No known exploits are available");

  script_set_attribute(attribute:"vuln_publication_date", value:"2020/03/10");
  script_set_attribute(attribute:"patch_publication_date", value:"2020/03/10");
  script_set_attribute(attribute:"plugin_publication_date", value:"2020/03/11");

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

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

  script_copyright(english:"This script is Copyright (C) 2020 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('audit.inc');
include('smb_func.inc');
include('smb_hotfixes.inc');
include('smb_hotfixes_fcheck.inc');
include('smb_reg_query.inc');
include('misc_func.inc');
include('install_func.inc');

get_kb_item_or_exit('SMB/MS_Bulletin_Checks/Possible');

bulletin = 'MS20-03';
kbs = make_list(
  '4484237'  # Office 2010 SP2 wwlibcxm.dll
);

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', exit_code:1);

vuln = FALSE;
port = kb_smb_transport();

office_vers = hotfix_check_office_version();

# Office 2010 SP2
if (office_vers['14.0'])
{
  office_sp = get_kb_item('SMB/Office/2010/SP');
  if (!isnull(office_sp) && office_sp == 2)
  {
    prod = 'Microsoft Office 2010 SP2';

    # wwlibcxm.dll only exists if KB2428677 is installed
    path = hotfix_get_officeprogramfilesdir(officever:'14.0');
    path = hotfix_append_path(path:path, value:'Microsoft Office\\Office14');
    kb = '4484237';
    file = 'wwlibcxm.dll';
    version = '14.0.7246.5000';
    if (hotfix_check_fversion(file:file, version:version, path:path, kb:kb, bulletin:bulletin, product:prod) == HCF_OLDER)
      vuln = TRUE;
  }
}

# Office 2016 / 2019 / C2R
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';
    prod2019 = 'Microsoft Office 2019';
    path = hotfix_get_officeprogramfilesdir(officever:'16.0');
    graph_exe_path = hotfix_append_path(path:path, value:'Microsoft Office\\root\\Office16');
    c2r_path = graph_exe_path;
    if (
      hotfix_check_fversion(file:'graph.exe', version:'16.0.11328.20554', channel:'Deferred', channel_product:'Office', path:c2r_path, bulletin:bulletin, product:prod) == HCF_OLDER ||
      hotfix_check_fversion(file:'graph.exe', version:'16.0.11929.20648', channel:'Deferred', channel_version:'1908', channel_product:'Office', path:c2r_path, bulletin:bulletin, product:prod) == HCF_OLDER ||
      hotfix_check_fversion(file:'graph.exe', version:'16.0.12527.20278', channel:'First Release for Deferred', channel_product:'Office', path:c2r_path, bulletin:bulletin, product:prod) == HCF_OLDER ||
      hotfix_check_fversion(file:'graph.exe', version:'16.0.12527.20278', channel:'Current', channel_product:'Office', path:c2r_path, bulletin:bulletin, product:prod) == HCF_OLDER ||
      # 2019
      hotfix_check_fversion(file:'graph.exe', version:'16.0.12527.20278', channel:'2019 Retail', channel_product:'Office', path:c2r_path, bulletin:bulletin, product:prod2019) == HCF_OLDER ||
      hotfix_check_fversion(file:'graph.exe', version:'16.0.10357.20081', channel:'2019 Volume', channel_product:'Office', path:c2r_path, bulletin:bulletin, product:prod2019) == HCF_OLDER
    )
    vuln = TRUE;
  }
}
if (vuln)
{
  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, 'affected');
}