Security Updates for Microsoft Office Online Server (August 2025)

#%NASL_MIN_LEVEL 80900
##
# (C) Tenable, 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(249119);
  script_version("1.3");
  script_set_attribute(attribute:"plugin_modification_date", value:"2025/09/17");

  script_cve_id(
    "CVE-2025-53735",
    "CVE-2025-53737",
    "CVE-2025-53739",
    "CVE-2025-53741",
    "CVE-2025-53759"
  );
  script_xref(name:"MSKB", value:"5002752");
  script_xref(name:"MSFT", value:"MS25-5002752");
  script_xref(name:"IAVA", value:"2025-A-0596");

  script_name(english:"Security Updates for Microsoft Office Online Server (August 2025)");

  script_set_attribute(attribute:"synopsis", value:
"The Microsoft Office Online Server installation on the remote host is affected by multiple vulnerabilities.");
  script_set_attribute(attribute:"description", value:
"The Microsoft Office Online Server installation on the remote host is missing security updates. It is, therefore,
affected by multiple remote code execution vulnerabilities. An attacker can exploit this to bypass authentication and
execute unauthorized arbitrary commands.");
  script_set_attribute(attribute:"see_also", value:"https://support.microsoft.com/en-us/help/5002752");
  script_set_attribute(attribute:"solution", value:
"Microsoft has released 5002752 to address this issue.");
  script_set_cvss_base_vector("CVSS2#AV:L/AC:L/Au:N/C:C/I:C/A: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_attribute(attribute:"cvss_score_source", value:"CVE-2025-53735");
  script_cwe_id(122, 416, 787, 843, 908);

  script_set_attribute(attribute:"vuln_publication_date", value:"2025/08/12");
  script_set_attribute(attribute:"patch_publication_date", value:"2025/08/12");
  script_set_attribute(attribute:"plugin_publication_date", value:"2025/08/12");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"cpe:/a:microsoft:office_online_server");
  script_set_attribute(attribute:"cpe", value:"cpe:/a:microsoft:office_web_apps");
  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) 2025 and is owned by Tenable, Inc. or an Affiliate thereof.");

  script_dependencies("office_installed.nasl", "microsoft_owa_installed.nbin", "microsoft_office_compatibility_pack_installed.nbin", "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('install_func.inc');

get_kb_item_or_exit('SMB/MS_Bulletin_Checks/Possible');

var path, vuln;

var bulletin = 'MS25-08';
var kbs = make_list('5002752');


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);

var port = kb_smb_transport();

# Get installs of Office Web Apps
var owa_installs = get_installs(app_name:'Microsoft Office Web Apps');

if (!empty_or_null(owa_installs))
{
  var owa_install;
  foreach owa_install (owa_installs[1])
  {
    if (owa_install['Product'] == '2016')
    {
      var oos_path = owa_install['path'];
      var oos_sp = owa_install['SP'];
    }
  }
}
vuln = FALSE;

####################################################################
# Office Online Server
####################################################################
if (oos_path && (!isnull(oos_sp) && oos_sp == '0'))
{
  path = hotfix_append_path(path:oos_path, value:'ExcelServicesEcs\\bin');
  if (hotfix_check_fversion(file:'xlsrv.dll', version:'16.0.10417.20034', min_version:'16.0.10000.0', path:path, kb:'5002752', product:'Office Online Server') == 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');
}