.NET Core Remote Code Execution Vulnerability - Windows

# SPDX-FileCopyrightText: 2023 Greenbone AG
# Some text descriptions might be excerpted from (a) referenced
# source(s), and are Copyright (C) by the respective right holder(s).
#
# SPDX-License-Identifier: GPL-2.0-only

CPE = "cpe:/a:microsoft:asp.net_core";

if(description)
{
  script_oid("1.3.6.1.4.1.25623.1.0.826920");
  script_version("2025-09-17T05:39:26+0000");
  script_cve_id("CVE-2023-21808");
  script_tag(name:"cvss_base", value:"7.2");
  script_tag(name:"cvss_base_vector", value:"AV:L/AC:L/Au:N/C:C/I:C/A:C");
  script_tag(name:"last_modification", value:"2025-09-17 05:39:26 +0000 (Wed, 17 Sep 2025)");
  script_tag(name:"severity_vector", value:"CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H");
  script_tag(name:"severity_origin", value:"NVD");
  script_tag(name:"severity_date", value:"2023-02-14 23:37:00 +0000 (Tue, 14 Feb 2023)");
  script_tag(name:"creation_date", value:"2023-02-15 10:39:31 +0530 (Wed, 15 Feb 2023)");
  script_name(".NET Core Remote Code Execution Vulnerability - Windows");

  script_tag(name:"summary", value:".NET Core is prone to a remote code execution (RCE)
  vulnerability.");

  script_tag(name:"vuldetect", value:"Checks if a vulnerable version is present
  on the target host.");

  script_tag(name:"insight", value:"The flaw exists due to a remote code execution
  vulnerability in .NET.");

  script_tag(name:"impact", value:"Successful exploitation will allow an
  attacker to conduct remote code execution on an affected system.");

  script_tag(name:"affected", value:".NET Core runtime 7.0 before 7.0.3, 6.0 before
  6.0.14 and .NET Core SDK before 6.0.114 and 6.0.309, 7.0 before 7.0.200.");

  script_tag(name:"solution", value:"Upgrade .NET Core runtimes to versions
  7.0.3 or 6.0.14 or later or upgrade .NET Core SDK to versions 6.0.114 or
  6.0.309 or 7.0.200 or later.");

  script_tag(name:"solution_type", value:"VendorFix");
  script_tag(name:"qod_type", value:"registry");
  script_xref(name:"URL", value:"https://github.com/dotnet/core/blob/main/release-notes/7.0/7.0.3/7.0.3.md");
  script_xref(name:"URL", value:"https://github.com/dotnet/core/blob/main/release-notes/6.0/6.0.14/6.0.14.md");
  script_category(ACT_GATHER_INFO);
  script_copyright("Copyright (C) 2023 Greenbone AG");
  script_family("Windows");
  script_dependencies("gb_asp_dotnet_core_detect_win.nasl");
  script_mandatory_keys("ASP.NET/Core/Ver");
  exit(0);
}

include("host_details.inc");
include("version_func.inc");

if(!infos = get_app_version_and_location(cpe:CPE, exit_no_version:TRUE))
  exit(0);

coreVers = infos["version"];
path = infos["location"];

if(!coreVers || coreVers !~ "^[6|7]\.0")
  exit(0);

if(!corerunVer = get_kb_item(".NET/Core/Runtime/Ver")) {
  if(!codesdkVer = get_kb_item(".NET/Core/SDK/Ver")) {
    exit(0);
  }
}

if(corerunVer) {
  if(version_in_range(version:corerunVer, test_version:"6.0", test_version2:"6.0.13")) {
    fix = "6.0.14 or later";
  }

  else if(version_in_range(version:corerunVer, test_version: "7.0", test_version2: "7.0.2")) {
    fix = "7.0.3 or later";
  }
}

else if(codesdkVer) {
  if(version_in_range(version:codesdkVer, test_version:"6.0", test_version2:"6.0.113") ||
     version_in_range(version:codesdkVer, test_version:"6.0.300", test_version2:"6.0.308")) {
    fix1 = "6.0.114 or 6.0.309 or later";
  }

  else if(version_in_range_exclusive(version:codesdkVer, test_version_lo: "7.0", test_version_up: "7.0.200")) {
    fix1 = "7.0.200 or later";
  }
}

if(fix) {
  report = report_fixed_ver(installed_version:"ASP .NET Core With Microsoft .NET Core runtimes " + corerunVer,
                            fixed_version:"ASP .NET Core With Microsoft .NET Core runtimes version " + fix, install_path:path);
  security_message(port:0, data:report);
  exit(0);
}

else if(fix1) {
  report = report_fixed_ver(installed_version:"ASP .NET Core With Microsoft .NET Core SDK " + codesdkVer,
                            fixed_version:"ASP .NET Core With Microsoft .NET Core SDK version " + fix1, install_path:path);
  security_message(port:0, data:report);
  exit(0);
}

exit(99);