Microsoft .NET Core NuGet Package Manager Tampering Vulnerability - Linux

# SPDX-FileCopyrightText: 2019 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:.net_core";

if(description)
{
  script_oid("1.3.6.1.4.1.25623.1.0.814698");
  script_version("2025-09-19T15:40:40+0000");
  script_cve_id("CVE-2019-0757");
  script_tag(name:"cvss_base", value:"4.0");
  script_tag(name:"cvss_base_vector", value:"AV:N/AC:L/Au:S/C:N/I:P/A:N");
  script_tag(name:"last_modification", value:"2025-09-19 15:40:40 +0000 (Fri, 19 Sep 2025)");
  script_tag(name:"severity_vector", value:"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N");
  script_tag(name:"severity_origin", value:"NVD");
  script_tag(name:"severity_date", value:"2022-04-11 20:36:00 +0000 (Mon, 11 Apr 2022)");
  script_tag(name:"creation_date", value:"2019-03-13 08:37:41 +0530 (Wed, 13 Mar 2019)");
  script_name("Microsoft .NET Core NuGet Package Manager Tampering Vulnerability - Linux");

  script_tag(name:"summary", value:".NET Core is prone to tampering 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 an improper
  permissions on folders inside the NuGet packages folder structure.");

  script_tag(name:"impact", value:"Successful exploitation will allow
  an authenticated attacker to modify a NuGet package's folder structure.
  An attacker who successfully exploited this vulnerability could potentially
  modify files and folders that are unpackaged on a system.");

  script_tag(name:"affected", value:"Microsoft .NET Core 1.0 before 1.0.15, 1.1 before 1.1.12, 2.1 before 2.1.9 and 2.2 before 2.2.3.");

  script_tag(name:"solution", value:"Upgrade to Microsoft .NET Core version 1.0.15 or 1.1.12
  or 2.1.9 or 2.2.3 or later. Please see the references for more information.");

  script_tag(name:"solution_type", value:"VendorFix");
  script_tag(name:"qod_type", value:"executable_version");
  script_xref(name:"URL", value:"https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2019-0757");
  script_xref(name:"URL", value:"https://devblogs.microsoft.com/dotnet/net-core-march-2019");
  script_category(ACT_GATHER_INFO);
  script_copyright("Copyright (C) 2019 Greenbone AG");
  script_family("General");
  script_dependencies("gb_dotnet_core_runtime_detect_lin.nasl");
  script_mandatory_keys("dotnet/core/runtime/Linux/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 );

dot_ver = infos["version"];
dot_path = infos["location"];

if(version_in_range(version:dot_ver, test_version:"1.0", test_version2:"1.0.14")){
  fix = "1.0.15";
}
else if(version_in_range(version:dot_ver, test_version:"1.1", test_version2:"1.1.11")){
  fix = "1.1.12";
}
else if(version_in_range(version:dot_ver, test_version:"2.1", test_version2:"2.1.8")){
  fix = "2.1.9";
}
else if(version_in_range(version:dot_ver, test_version:"2.2", test_version2:"2.2.2")){
  fix = "2.2.3";
}

if(fix)
{
  report = report_fixed_ver(installed_version:dot_ver, fixed_version:fix, install_path:dot_path);
  security_message(data:report);
  exit(0);
}
exit(99);