Microsoft .NET Framework (August 2026)

#%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(341336);
  script_version("1.1");
  script_set_attribute(attribute:"plugin_modification_date", value:"2026/08/28");

  script_cve_id(
    "CVE-2026-62872",
    "CVE-2026-62897",
    "CVE-2026-65810",
    "CVE-2026-70354"
  );
  script_xref(name:"MSKB", value:"5120418");
  script_xref(name:"MSKB", value:"5120695");
  script_xref(name:"MSKB", value:"5120698");
  script_xref(name:"MSKB", value:"5120699");
  script_xref(name:"MSKB", value:"5120700");
  script_xref(name:"MSKB", value:"5120701");
  script_xref(name:"MSKB", value:"5120702");
  script_xref(name:"MSKB", value:"5120703");
  script_xref(name:"MSKB", value:"5120704");
  script_xref(name:"MSKB", value:"5120705");
  script_xref(name:"MSKB", value:"5120706");
  script_xref(name:"MSKB", value:"5120708");
  script_xref(name:"MSKB", value:"5120709");
  script_xref(name:"MSKB", value:"5120710");
  script_xref(name:"MSKB", value:"5120711");
  script_xref(name:"MSKB", value:"5120713");
  script_xref(name:"MSKB", value:"5120714");
  script_xref(name:"MSKB", value:"5120716");
  script_xref(name:"MSKB", value:"5120747");
  script_xref(name:"MSFT", value:"MS26-5120418");
  script_xref(name:"MSFT", value:"MS26-5120695");
  script_xref(name:"MSFT", value:"MS26-5120698");
  script_xref(name:"MSFT", value:"MS26-5120699");
  script_xref(name:"MSFT", value:"MS26-5120700");
  script_xref(name:"MSFT", value:"MS26-5120701");
  script_xref(name:"MSFT", value:"MS26-5120702");
  script_xref(name:"MSFT", value:"MS26-5120703");
  script_xref(name:"MSFT", value:"MS26-5120704");
  script_xref(name:"MSFT", value:"MS26-5120705");
  script_xref(name:"MSFT", value:"MS26-5120706");
  script_xref(name:"MSFT", value:"MS26-5120708");
  script_xref(name:"MSFT", value:"MS26-5120709");
  script_xref(name:"MSFT", value:"MS26-5120710");
  script_xref(name:"MSFT", value:"MS26-5120711");
  script_xref(name:"MSFT", value:"MS26-5120713");
  script_xref(name:"MSFT", value:"MS26-5120714");
  script_xref(name:"MSFT", value:"MS26-5120716");
  script_xref(name:"MSFT", value:"MS26-5120747");

  script_name(english:"Microsoft .NET Framework (August 2026)");

  script_set_attribute(attribute:"synopsis", value:
"The Microsoft .NET Framework installation on the remote host is affected by multiple vulnerabilities.");
  script_set_attribute(attribute:"description", value:
"The Microsoft .NET Framework installation on the remote host is missing security updates. It is,
therefore, affected by multiple vulnerabilities:

  - Incorrect authorization in .NET Framework allows an authorized attacker to elevate privileges over a
    network. (CVE-2026-62872)

  - Relative path traversal in .NET Framework allows an unauthorized attacker to elevate privileges locally.
    (CVE-2026-65810)

  - Out-of-bounds write in .NET allows an unauthorized attacker to execute code locally. (CVE-2026-70354)

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/help/5120695");
  script_set_attribute(attribute:"see_also", value:"https://support.microsoft.com/help/5120698");
  script_set_attribute(attribute:"see_also", value:"https://support.microsoft.com/help/5120699");
  script_set_attribute(attribute:"see_also", value:"https://support.microsoft.com/help/5120700");
  script_set_attribute(attribute:"see_also", value:"https://support.microsoft.com/help/5120701");
  script_set_attribute(attribute:"see_also", value:"https://support.microsoft.com/help/5120702");
  script_set_attribute(attribute:"see_also", value:"https://support.microsoft.com/help/5120703");
  script_set_attribute(attribute:"see_also", value:"https://support.microsoft.com/help/5120704");
  script_set_attribute(attribute:"see_also", value:"https://support.microsoft.com/help/5120705");
  script_set_attribute(attribute:"see_also", value:"https://support.microsoft.com/help/5120706");
  script_set_attribute(attribute:"see_also", value:"https://support.microsoft.com/help/5120708");
  script_set_attribute(attribute:"see_also", value:"https://support.microsoft.com/help/5120709");
  script_set_attribute(attribute:"see_also", value:"https://support.microsoft.com/help/5120710");
  script_set_attribute(attribute:"see_also", value:"https://support.microsoft.com/help/5120711");
  script_set_attribute(attribute:"see_also", value:"https://support.microsoft.com/help/5120713");
  script_set_attribute(attribute:"see_also", value:"https://support.microsoft.com/help/5120714");
  script_set_attribute(attribute:"see_also", value:"https://support.microsoft.com/help/5120716");
  script_set_attribute(attribute:"see_also", value:"https://support.microsoft.com/help/5120747");
  script_set_attribute(attribute:"solution", value:
"Microsoft has released the following security updates to address this issue:
  -KB5120695
  -KB5120698
  -KB5120699
  -KB5120700
  -KB5120701
  -KB5120702
  -KB5120703
  -KB5120704
  -KB5120705
  -KB5120706
  -KB5120708
  -KB5120709
  -KB5120710
  -KB5120711
  -KB5120713
  -KB5120714
  -KB5120716
  -KB5120747");
  script_set_cvss_base_vector("CVSS2#AV:N/AC:L/Au:S/C:C/I:C/A:C");
  script_set_cvss3_base_vector("CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H");
  script_set_attribute(attribute:"cvss_score_source", value:"CVE-2026-62872");
  script_cwe_id(23, 190, 787, 863);

  script_set_attribute(attribute:"vuln_publication_date", value:"2026/08/11");
  script_set_attribute(attribute:"patch_publication_date", value:"2026/08/11");
  script_set_attribute(attribute:"plugin_publication_date", value:"2026/08/28");

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

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

  script_copyright(english:"This script is Copyright (C) 2026 and is owned by Tenable, Inc. or an Affiliate thereof.");

  script_dependencies("smb_check_dotnet_rollup.nasl", "smb_hotfixes.nasl", "ms_bulletin_checks_possible.nasl", "microsoft_net_framework_installed.nasl");
  script_require_keys("SMB/MS_Bulletin_Checks/Possible");
  script_require_ports(139, 445, "Host/patch_management_checks");

  exit(0);
}

include('install_func.inc');
include('smb_func.inc');
include('smb_hotfixes.inc');
include('smb_hotfixes_fcheck.inc');

get_kb_item_or_exit('SMB/MS_Bulletin_Checks/Possible');

var bulletin = 'MS26-08';
var kbs = make_list(
  
  '5120418',
  '5120695',
  '5120698',
  '5120699',
  '5120700',
  '5120701',
  '5120702',
  '5120703',
  '5120704',
  '5120705',
  '5120706',
  '5120708',
  '5120709',
  '5120710',
  '5120711',
  '5120713',
  '5120714',
  '5120716',
  '5120747'
);

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(win10:'0') <= 0) audit(AUDIT_OS_SP_NOT_VULN);

var share = hotfix_get_systemdrive(exit_on_fail:TRUE, as_share:TRUE);
if (!is_accessible_share(share:share)) audit(AUDIT_SHARE_FAIL, share);

var app = 'Microsoft .NET Framework';
get_install_count(app_name:app, exit_if_zero:TRUE);
var installs = get_combined_installs(app_name:app);

var install, version;
var vuln = 0;

if (installs[0] == 0)
{
  foreach install (installs[1])
  {
    version = install['version'];
    if( version != UNKNOWN_VER &&
        smb_check_dotnet_rollup(rollup_date:'08_2026', dotnet_ver:version))
      vuln++;
  }
}
if(vuln)
{
  hotfix_security_hole();
  hotfix_check_fversion_end();
  exit(0);
}
else
{
  hotfix_check_fversion_end();
  audit(AUDIT_HOST_NOT, 'affected');
}