Ubuntu 22.04 LTS / 24.04 LTS / 25.10 / 26.04 LTS : .NET vulnerabilities (USN-8420-1)

#%NASL_MIN_LEVEL 80900
##
# (C) Tenable, Inc.
#
# The descriptive text and package checks in this plugin were
# extracted from Ubuntu Security Notice USN-8420-1. The text
# itself is copyright (C) Canonical, Inc. See
# <https://ubuntu.com/security/notices>. Ubuntu(R) is a registered
# trademark of Canonical, Inc.
##

include('compat.inc');

if (description)
{
  script_id(320847);
  script_version("1.3");
  script_set_attribute(attribute:"plugin_modification_date", value:"2026/06/22");

  script_cve_id("CVE-2026-45491", "CVE-2026-45591");
  script_xref(name:"USN", value:"8420-1");
  script_xref(name:"IAVA", value:"2026-A-0566");
  script_xref(name:"IAVA", value:"2026-A-0565");

  script_name(english:"Ubuntu 22.04 LTS / 24.04 LTS / 25.10 / 26.04 LTS : .NET vulnerabilities (USN-8420-1)");

  script_set_attribute(attribute:"synopsis", value:
"The remote Ubuntu host is missing one or more security updates.");
  script_set_attribute(attribute:"description", value:
"The remote Ubuntu 22.04 LTS / 24.04 LTS / 25.10 / 26.04 LTS host has packages installed that are affected by multiple
vulnerabilities as referenced in the USN-8420-1 advisory.

    It was discovered that .NET did not properly handle link resolution before file access. A local attacker
    could use this issue to perform unauthorized file tampering and write arbitrary files outside of the
    intended extraction directory. (CVE-2026-45491)

    It was discovered that .NET did not properly handle deeply-nested MessagePack arrays. An attacker could
    use this to cause .NET to consume excessive resources, resulting in a denial of service. (CVE-2026-45591)

Tenable has extracted the preceding description block directly from the Ubuntu security advisory.

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://ubuntu.com/security/notices/USN-8420-1");
  script_set_attribute(attribute:"solution", value:
"Update the affected packages.");
  script_set_cvss_base_vector("CVSS2#AV:L/AC:L/Au:S/C:N/I:C/A:N");
  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:L/UI:N/S:U/C:N/I:H/A:N");
  script_set_cvss3_temporal_vector("CVSS:3.0/E:U/RL:O/RC:C");
  script_set_attribute(attribute:"cvss_score_source", value:"CVE-2026-45491");

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

  script_set_attribute(attribute:"vuln_publication_date", value:"2026/06/09");
  script_set_attribute(attribute:"patch_publication_date", value:"2026/06/11");
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  script_category(ACT_GATHER_INFO);
  script_family(english:"Ubuntu Local Security Checks");

  script_copyright(english:"Ubuntu Security Notice (C) 2026 Canonical, Inc. / NASL script (C) 2026 and is owned by Tenable, Inc. or an Affiliate thereof.");

  script_dependencies("ssh_get_info.nasl");
  script_require_keys("Host/cpu", "Host/Ubuntu", "Host/Ubuntu/release", "Host/Debian/dpkg-l");

  exit(0);
}

include('debian_package.inc');

if ( ! get_kb_item('Host/local_checks_enabled') ) audit(AUDIT_LOCAL_CHECKS_NOT_ENABLED);
var os_release = get_kb_item('Host/Ubuntu/release');
if ( isnull(os_release) ) audit(AUDIT_OS_NOT, 'Ubuntu');
os_release = chomp(os_release);
if (! ('22.04' >< os_release || '24.04' >< os_release || '25.10' >< os_release || '26.04' >< os_release)) audit(AUDIT_OS_NOT, 'Ubuntu 22.04 / 24.04 / 25.10 / 26.04', 'Ubuntu ' + os_release);
if ( ! get_kb_item('Host/Debian/dpkg-l') ) audit(AUDIT_PACKAGE_LIST_MISSING);

var cpu = get_kb_item('Host/cpu');
if (isnull(cpu)) audit(AUDIT_UNKNOWN_ARCH);
if ('x86_64' >!< cpu && cpu !~ "^i[3-6]86$" && 's390' >!< cpu && 'aarch64' >!< cpu) audit(AUDIT_LOCAL_CHECKS_NOT_IMPLEMENTED, 'Ubuntu', cpu);

var pkgs = [
    {'osver': '22.04', 'pkgname': 'aspnetcore-runtime-8.0', 'pkgver': '8.0.28-0ubuntu1~22.04.1'},
    {'osver': '22.04', 'pkgname': 'aspnetcore-runtime-dbg-8.0', 'pkgver': '8.0.28-0ubuntu1~22.04.1'},
    {'osver': '22.04', 'pkgname': 'aspnetcore-targeting-pack-8.0', 'pkgver': '8.0.28-0ubuntu1~22.04.1'},
    {'osver': '22.04', 'pkgname': 'dotnet-apphost-pack-8.0', 'pkgver': '8.0.28-0ubuntu1~22.04.1'},
    {'osver': '22.04', 'pkgname': 'dotnet-host-8.0', 'pkgver': '8.0.28-0ubuntu1~22.04.1'},
    {'osver': '22.04', 'pkgname': 'dotnet-hostfxr-8.0', 'pkgver': '8.0.28-0ubuntu1~22.04.1'},
    {'osver': '22.04', 'pkgname': 'dotnet-runtime-8.0', 'pkgver': '8.0.28-0ubuntu1~22.04.1'},
    {'osver': '22.04', 'pkgname': 'dotnet-runtime-dbg-8.0', 'pkgver': '8.0.28-0ubuntu1~22.04.1'},
    {'osver': '22.04', 'pkgname': 'dotnet-sdk-8.0', 'pkgver': '8.0.128-0ubuntu1~22.04.1'},
    {'osver': '22.04', 'pkgname': 'dotnet-sdk-8.0-source-built-artifacts', 'pkgver': '8.0.128-0ubuntu1~22.04.1'},
    {'osver': '22.04', 'pkgname': 'dotnet-sdk-dbg-8.0', 'pkgver': '8.0.128-0ubuntu1~22.04.1'},
    {'osver': '22.04', 'pkgname': 'dotnet-targeting-pack-8.0', 'pkgver': '8.0.28-0ubuntu1~22.04.1'},
    {'osver': '22.04', 'pkgname': 'dotnet-templates-8.0', 'pkgver': '8.0.128-0ubuntu1~22.04.1'},
    {'osver': '22.04', 'pkgname': 'dotnet8', 'pkgver': '8.0.128-8.0.28-0ubuntu1~22.04.1'},
    {'osver': '22.04', 'pkgname': 'netstandard-targeting-pack-2.1-8.0', 'pkgver': '8.0.128-0ubuntu1~22.04.1'},
    {'osver': '24.04', 'pkgname': 'aspnetcore-runtime-10.0', 'pkgver': '10.0.9-0ubuntu1~24.04.1'},
    {'osver': '24.04', 'pkgname': 'aspnetcore-runtime-8.0', 'pkgver': '8.0.28-0ubuntu1~24.04.1'},
    {'osver': '24.04', 'pkgname': 'aspnetcore-runtime-dbg-10.0', 'pkgver': '10.0.9-0ubuntu1~24.04.1'},
    {'osver': '24.04', 'pkgname': 'aspnetcore-runtime-dbg-8.0', 'pkgver': '8.0.28-0ubuntu1~24.04.1'},
    {'osver': '24.04', 'pkgname': 'aspnetcore-targeting-pack-10.0', 'pkgver': '10.0.9-0ubuntu1~24.04.1'},
    {'osver': '24.04', 'pkgname': 'aspnetcore-targeting-pack-8.0', 'pkgver': '8.0.28-0ubuntu1~24.04.1'},
    {'osver': '24.04', 'pkgname': 'dotnet-apphost-pack-10.0', 'pkgver': '10.0.9-0ubuntu1~24.04.1'},
    {'osver': '24.04', 'pkgname': 'dotnet-apphost-pack-8.0', 'pkgver': '8.0.28-0ubuntu1~24.04.1'},
    {'osver': '24.04', 'pkgname': 'dotnet-host-10.0', 'pkgver': '10.0.9-0ubuntu1~24.04.1'},
    {'osver': '24.04', 'pkgname': 'dotnet-host-8.0', 'pkgver': '8.0.28-0ubuntu1~24.04.1'},
    {'osver': '24.04', 'pkgname': 'dotnet-hostfxr-10.0', 'pkgver': '10.0.9-0ubuntu1~24.04.1'},
    {'osver': '24.04', 'pkgname': 'dotnet-hostfxr-8.0', 'pkgver': '8.0.28-0ubuntu1~24.04.1'},
    {'osver': '24.04', 'pkgname': 'dotnet-runtime-10.0', 'pkgver': '10.0.9-0ubuntu1~24.04.1'},
    {'osver': '24.04', 'pkgname': 'dotnet-runtime-8.0', 'pkgver': '8.0.28-0ubuntu1~24.04.1'},
    {'osver': '24.04', 'pkgname': 'dotnet-runtime-dbg-10.0', 'pkgver': '10.0.9-0ubuntu1~24.04.1'},
    {'osver': '24.04', 'pkgname': 'dotnet-runtime-dbg-8.0', 'pkgver': '8.0.28-0ubuntu1~24.04.1'},
    {'osver': '24.04', 'pkgname': 'dotnet-sdk-10.0', 'pkgver': '10.0.109-0ubuntu1~24.04.1'},
    {'osver': '24.04', 'pkgname': 'dotnet-sdk-10.0-source-built-artifacts', 'pkgver': '10.0.109-0ubuntu1~24.04.1'},
    {'osver': '24.04', 'pkgname': 'dotnet-sdk-8.0', 'pkgver': '8.0.128-0ubuntu1~24.04.1'},
    {'osver': '24.04', 'pkgname': 'dotnet-sdk-8.0-source-built-artifacts', 'pkgver': '8.0.128-0ubuntu1~24.04.1'},
    {'osver': '24.04', 'pkgname': 'dotnet-sdk-aot-10.0', 'pkgver': '10.0.109-0ubuntu1~24.04.1'},
    {'osver': '24.04', 'pkgname': 'dotnet-sdk-dbg-10.0', 'pkgver': '10.0.109-0ubuntu1~24.04.1'},
    {'osver': '24.04', 'pkgname': 'dotnet-sdk-dbg-8.0', 'pkgver': '8.0.128-0ubuntu1~24.04.1'},
    {'osver': '24.04', 'pkgname': 'dotnet-targeting-pack-10.0', 'pkgver': '10.0.9-0ubuntu1~24.04.1'},
    {'osver': '24.04', 'pkgname': 'dotnet-targeting-pack-8.0', 'pkgver': '8.0.28-0ubuntu1~24.04.1'},
    {'osver': '24.04', 'pkgname': 'dotnet-templates-10.0', 'pkgver': '10.0.109-0ubuntu1~24.04.1'},
    {'osver': '24.04', 'pkgname': 'dotnet-templates-8.0', 'pkgver': '8.0.128-0ubuntu1~24.04.1'},
    {'osver': '24.04', 'pkgname': 'dotnet10', 'pkgver': '10.0.109-10.0.9-0ubuntu1~24.04.1'},
    {'osver': '24.04', 'pkgname': 'dotnet8', 'pkgver': '8.0.128-8.0.28-0ubuntu1~24.04.1'},
    {'osver': '24.04', 'pkgname': 'netstandard-targeting-pack-2.1-8.0', 'pkgver': '8.0.128-0ubuntu1~24.04.1'},
    {'osver': '25.10', 'pkgname': 'aspnetcore-runtime-10.0', 'pkgver': '10.0.9-0ubuntu1~25.10.1'},
    {'osver': '25.10', 'pkgname': 'aspnetcore-runtime-8.0', 'pkgver': '8.0.28-0ubuntu1~25.10.1'},
    {'osver': '25.10', 'pkgname': 'aspnetcore-runtime-9.0', 'pkgver': '9.0.17-0ubuntu1~25.10.1'},
    {'osver': '25.10', 'pkgname': 'aspnetcore-runtime-dbg-10.0', 'pkgver': '10.0.9-0ubuntu1~25.10.1'},
    {'osver': '25.10', 'pkgname': 'aspnetcore-runtime-dbg-8.0', 'pkgver': '8.0.28-0ubuntu1~25.10.1'},
    {'osver': '25.10', 'pkgname': 'aspnetcore-runtime-dbg-9.0', 'pkgver': '9.0.17-0ubuntu1~25.10.1'},
    {'osver': '25.10', 'pkgname': 'aspnetcore-targeting-pack-10.0', 'pkgver': '10.0.9-0ubuntu1~25.10.1'},
    {'osver': '25.10', 'pkgname': 'aspnetcore-targeting-pack-8.0', 'pkgver': '8.0.28-0ubuntu1~25.10.1'},
    {'osver': '25.10', 'pkgname': 'aspnetcore-targeting-pack-9.0', 'pkgver': '9.0.17-0ubuntu1~25.10.1'},
    {'osver': '25.10', 'pkgname': 'dotnet-apphost-pack-10.0', 'pkgver': '10.0.9-0ubuntu1~25.10.1'},
    {'osver': '25.10', 'pkgname': 'dotnet-apphost-pack-8.0', 'pkgver': '8.0.28-0ubuntu1~25.10.1'},
    {'osver': '25.10', 'pkgname': 'dotnet-apphost-pack-9.0', 'pkgver': '9.0.17-0ubuntu1~25.10.1'},
    {'osver': '25.10', 'pkgname': 'dotnet-host-10.0', 'pkgver': '10.0.9-0ubuntu1~25.10.1'},
    {'osver': '25.10', 'pkgname': 'dotnet-host-8.0', 'pkgver': '8.0.28-0ubuntu1~25.10.1'},
    {'osver': '25.10', 'pkgname': 'dotnet-host-9.0', 'pkgver': '9.0.17-0ubuntu1~25.10.1'},
    {'osver': '25.10', 'pkgname': 'dotnet-hostfxr-10.0', 'pkgver': '10.0.9-0ubuntu1~25.10.1'},
    {'osver': '25.10', 'pkgname': 'dotnet-hostfxr-8.0', 'pkgver': '8.0.28-0ubuntu1~25.10.1'},
    {'osver': '25.10', 'pkgname': 'dotnet-hostfxr-9.0', 'pkgver': '9.0.17-0ubuntu1~25.10.1'},
    {'osver': '25.10', 'pkgname': 'dotnet-runtime-10.0', 'pkgver': '10.0.9-0ubuntu1~25.10.1'},
    {'osver': '25.10', 'pkgname': 'dotnet-runtime-8.0', 'pkgver': '8.0.28-0ubuntu1~25.10.1'},
    {'osver': '25.10', 'pkgname': 'dotnet-runtime-9.0', 'pkgver': '9.0.17-0ubuntu1~25.10.1'},
    {'osver': '25.10', 'pkgname': 'dotnet-runtime-dbg-10.0', 'pkgver': '10.0.9-0ubuntu1~25.10.1'},
    {'osver': '25.10', 'pkgname': 'dotnet-runtime-dbg-8.0', 'pkgver': '8.0.28-0ubuntu1~25.10.1'},
    {'osver': '25.10', 'pkgname': 'dotnet-runtime-dbg-9.0', 'pkgver': '9.0.17-0ubuntu1~25.10.1'},
    {'osver': '25.10', 'pkgname': 'dotnet-sdk-10.0', 'pkgver': '10.0.109-0ubuntu1~25.10.1'},
    {'osver': '25.10', 'pkgname': 'dotnet-sdk-10.0-source-built-artifacts', 'pkgver': '10.0.109-0ubuntu1~25.10.1'},
    {'osver': '25.10', 'pkgname': 'dotnet-sdk-8.0', 'pkgver': '8.0.128-0ubuntu1~25.10.1'},
    {'osver': '25.10', 'pkgname': 'dotnet-sdk-8.0-source-built-artifacts', 'pkgver': '8.0.128-0ubuntu1~25.10.1'},
    {'osver': '25.10', 'pkgname': 'dotnet-sdk-9.0', 'pkgver': '9.0.118-0ubuntu1~25.10.1'},
    {'osver': '25.10', 'pkgname': 'dotnet-sdk-9.0-source-built-artifacts', 'pkgver': '9.0.118-0ubuntu1~25.10.1'},
    {'osver': '25.10', 'pkgname': 'dotnet-sdk-aot-10.0', 'pkgver': '10.0.109-0ubuntu1~25.10.1'},
    {'osver': '25.10', 'pkgname': 'dotnet-sdk-aot-9.0', 'pkgver': '9.0.118-0ubuntu1~25.10.1'},
    {'osver': '25.10', 'pkgname': 'dotnet-sdk-dbg-10.0', 'pkgver': '10.0.109-0ubuntu1~25.10.1'},
    {'osver': '25.10', 'pkgname': 'dotnet-sdk-dbg-8.0', 'pkgver': '8.0.128-0ubuntu1~25.10.1'},
    {'osver': '25.10', 'pkgname': 'dotnet-sdk-dbg-9.0', 'pkgver': '9.0.118-0ubuntu1~25.10.1'},
    {'osver': '25.10', 'pkgname': 'dotnet-targeting-pack-10.0', 'pkgver': '10.0.9-0ubuntu1~25.10.1'},
    {'osver': '25.10', 'pkgname': 'dotnet-targeting-pack-8.0', 'pkgver': '8.0.28-0ubuntu1~25.10.1'},
    {'osver': '25.10', 'pkgname': 'dotnet-targeting-pack-9.0', 'pkgver': '9.0.17-0ubuntu1~25.10.1'},
    {'osver': '25.10', 'pkgname': 'dotnet-templates-10.0', 'pkgver': '10.0.109-0ubuntu1~25.10.1'},
    {'osver': '25.10', 'pkgname': 'dotnet-templates-8.0', 'pkgver': '8.0.128-0ubuntu1~25.10.1'},
    {'osver': '25.10', 'pkgname': 'dotnet-templates-9.0', 'pkgver': '9.0.118-0ubuntu1~25.10.1'},
    {'osver': '25.10', 'pkgname': 'dotnet10', 'pkgver': '10.0.109-10.0.9-0ubuntu1~25.10.1'},
    {'osver': '25.10', 'pkgname': 'dotnet8', 'pkgver': '8.0.128-8.0.28-0ubuntu1~25.10.1'},
    {'osver': '25.10', 'pkgname': 'dotnet9', 'pkgver': '9.0.118-9.0.17-0ubuntu1~25.10.1'},
    {'osver': '25.10', 'pkgname': 'netstandard-targeting-pack-2.1-8.0', 'pkgver': '8.0.128-0ubuntu1~25.10.1'},
    {'osver': '25.10', 'pkgname': 'netstandard-targeting-pack-2.1-9.0', 'pkgver': '9.0.118-0ubuntu1~25.10.1'},
    {'osver': '26.04', 'pkgname': 'aspnetcore-runtime-10.0', 'pkgver': '10.0.9-0ubuntu1~26.04.1'},
    {'osver': '26.04', 'pkgname': 'aspnetcore-runtime-dbg-10.0', 'pkgver': '10.0.9-0ubuntu1~26.04.1'},
    {'osver': '26.04', 'pkgname': 'aspnetcore-targeting-pack-10.0', 'pkgver': '10.0.9-0ubuntu1~26.04.1'},
    {'osver': '26.04', 'pkgname': 'dotnet-apphost-pack-10.0', 'pkgver': '10.0.9-0ubuntu1~26.04.1'},
    {'osver': '26.04', 'pkgname': 'dotnet-host-10.0', 'pkgver': '10.0.9-0ubuntu1~26.04.1'},
    {'osver': '26.04', 'pkgname': 'dotnet-hostfxr-10.0', 'pkgver': '10.0.9-0ubuntu1~26.04.1'},
    {'osver': '26.04', 'pkgname': 'dotnet-runtime-10.0', 'pkgver': '10.0.9-0ubuntu1~26.04.1'},
    {'osver': '26.04', 'pkgname': 'dotnet-runtime-dbg-10.0', 'pkgver': '10.0.9-0ubuntu1~26.04.1'},
    {'osver': '26.04', 'pkgname': 'dotnet-sdk-10.0', 'pkgver': '10.0.109-0ubuntu1~26.04.1'},
    {'osver': '26.04', 'pkgname': 'dotnet-sdk-10.0-source-built-artifacts', 'pkgver': '10.0.109-0ubuntu1~26.04.1'},
    {'osver': '26.04', 'pkgname': 'dotnet-sdk-aot-10.0', 'pkgver': '10.0.109-0ubuntu1~26.04.1'},
    {'osver': '26.04', 'pkgname': 'dotnet-sdk-dbg-10.0', 'pkgver': '10.0.109-0ubuntu1~26.04.1'},
    {'osver': '26.04', 'pkgname': 'dotnet-targeting-pack-10.0', 'pkgver': '10.0.9-0ubuntu1~26.04.1'},
    {'osver': '26.04', 'pkgname': 'dotnet-templates-10.0', 'pkgver': '10.0.109-0ubuntu1~26.04.1'},
    {'osver': '26.04', 'pkgname': 'dotnet10', 'pkgver': '10.0.109-10.0.9-0ubuntu1~26.04.1'}
];

var flag = 0;
foreach var package_array ( pkgs ) {
  var osver = NULL;
  var pkgname = NULL;
  var pkgver = NULL;
  if (!empty_or_null(package_array['osver'])) osver = package_array['osver'];
  if (!empty_or_null(package_array['pkgname'])) pkgname = package_array['pkgname'];
  if (!empty_or_null(package_array['pkgver'])) pkgver = package_array['pkgver'];
  if (!empty_or_null(package_array['cves'])) cves = package_array['cves'];
  if (osver && pkgname && pkgver) {
    if (deb_check(release:osver, prefix:pkgname, reference:pkgver, cves:cves)) flag++;
  }
}

if (flag)
{
  var extra = '';
  extra += ubuntu_report_get();
  security_report_v4(
    port       : 0,
    severity   : SECURITY_WARNING,
    extra      : extra
  );
  exit(0);
}
else
{
  var tested = ubuntu_pkg_tests_get();
  if (tested) audit(AUDIT_PACKAGE_NOT_AFFECTED, tested);
  else audit(AUDIT_PACKAGE_NOT_INSTALLED, 'aspnetcore-runtime-10.0 / aspnetcore-runtime-8.0 / etc');
}