Ubuntu 22.04 LTS / 24.04 LTS / 25.10 : .NET vulnerabilities (USN-8176-1)

#%NASL_MIN_LEVEL 80900
##
# (C) Tenable, Inc.
#
# The descriptive text and package checks in this plugin were
# extracted from Ubuntu Security Notice USN-8176-1. 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(306722);
  script_version("1.3");
  script_set_attribute(attribute:"plugin_modification_date", value:"2026/05/08");

  script_cve_id(
    "CVE-2026-26171",
    "CVE-2026-32178",
    "CVE-2026-32203",
    "CVE-2026-33116"
  );
  script_xref(name:"USN", value:"8176-1");
  script_xref(name:"IAVA", value:"2026-A-0339");

  script_name(english:"Ubuntu 22.04 LTS / 24.04 LTS / 25.10 : .NET vulnerabilities (USN-8176-1)");

  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 host has packages installed that are affected by multiple
vulnerabilities as referenced in the USN-8176-1 advisory.

    Ludvig Pedersen discovered that the System.Security.Cryptography.Xml library in .NET incorrectly handled
    certain XML inputs. An attacker could possibly use this issue to consume excessive resources, resulting in
    a denial of service. (CVE-2026-33116, CVE-2026-26171)

    Ludvig Pedersen and Kevin Jones discovered that the System.Security.Cryptography.Xml library in .NET
    incorrectly handled certain XML inputs. An attacker could possibly use this issue to cause .NET to crash,
    resulting in a denial of service. (CVE-2026-32203)

    Ludvig Pedersen discovered that the System.Net.Mail component in .NET incorrectly handled certain inputs.
    An attacker could possibly use this issue to perform a network spoofing attack. (CVE-2026-32178)

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-8176-1");
  script_set_attribute(attribute:"solution", value:
"Update the affected packages.");
  script_set_cvss_base_vector("CVSS2#AV:N/AC:L/Au:N/C:C/I:N/A:N");
  script_set_cvss_temporal_vector("CVSS2#E:U/RL:OF/RC:C");
  script_set_cvss3_base_vector("CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H");
  script_set_cvss3_temporal_vector("CVSS:3.0/E:U/RL:O/RC:C");
  script_set_attribute(attribute:"cvss_score_source", value:"CVE-2026-32178");
  script_set_attribute(attribute:"cvss3_score_source", value:"CVE-2026-33116");

  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:"2026/04/14");
  script_set_attribute(attribute:"patch_publication_date", value:"2026/04/15");
  script_set_attribute(attribute:"plugin_publication_date", value:"2026/04/16");

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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)) audit(AUDIT_OS_NOT, 'Ubuntu 22.04 / 24.04 / 25.10', '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': '8.0.26-0ubuntu1~22.04.1'},
    {'osver': '22.04', 'pkgname': 'aspnetcore-runtime-dbg-8.0', 'pkgver': '8.0.26-0ubuntu1~22.04.1'},
    {'osver': '22.04', 'pkgname': 'aspnetcore-targeting-pack-8.0', 'pkgver': '8.0.26-0ubuntu1~22.04.1'},
    {'osver': '22.04', 'pkgname': 'dotnet-apphost-pack-8.0', 'pkgver': '8.0.26-0ubuntu1~22.04.1'},
    {'osver': '22.04', 'pkgname': 'dotnet-host-8.0', 'pkgver': '8.0.26-0ubuntu1~22.04.1'},
    {'osver': '22.04', 'pkgname': 'dotnet-hostfxr-8.0', 'pkgver': '8.0.26-0ubuntu1~22.04.1'},
    {'osver': '22.04', 'pkgname': 'dotnet-runtime-8.0', 'pkgver': '8.0.26-0ubuntu1~22.04.1'},
    {'osver': '22.04', 'pkgname': 'dotnet-runtime-dbg-8.0', 'pkgver': '8.0.26-0ubuntu1~22.04.1'},
    {'osver': '22.04', 'pkgname': 'dotnet-sdk-8.0', 'pkgver': '8.0.126-0ubuntu1~22.04.1'},
    {'osver': '22.04', 'pkgname': 'dotnet-sdk-8.0-source-built-artifacts', 'pkgver': '8.0.126-0ubuntu1~22.04.1'},
    {'osver': '22.04', 'pkgname': 'dotnet-sdk-dbg-8.0', 'pkgver': '8.0.126-0ubuntu1~22.04.1'},
    {'osver': '22.04', 'pkgname': 'dotnet-targeting-pack-8.0', 'pkgver': '8.0.26-0ubuntu1~22.04.1'},
    {'osver': '22.04', 'pkgname': 'dotnet-templates-8.0', 'pkgver': '8.0.126-0ubuntu1~22.04.1'},
    {'osver': '22.04', 'pkgname': 'dotnet8', 'pkgver': '8.0.126-8.0.26-0ubuntu1~22.04.1'},
    {'osver': '22.04', 'pkgname': 'netstandard-targeting-pack-2.1-8.0', 'pkgver': '8.0.126-0ubuntu1~22.04.1'},
    {'osver': '24.04', 'pkgname': 'aspnetcore-runtime-10.0', 'pkgver': '10.0.6-0ubuntu1~24.04.1'},
    {'osver': '24.04', 'pkgname': 'aspnetcore-runtime-8.0', 'pkgver': '8.0.26-0ubuntu1~24.04.1'},
    {'osver': '24.04', 'pkgname': 'aspnetcore-runtime-dbg-10.0', 'pkgver': '10.0.6-0ubuntu1~24.04.1'},
    {'osver': '24.04', 'pkgname': 'aspnetcore-runtime-dbg-8.0', 'pkgver': '8.0.26-0ubuntu1~24.04.1'},
    {'osver': '24.04', 'pkgname': 'aspnetcore-targeting-pack-10.0', 'pkgver': '10.0.6-0ubuntu1~24.04.1'},
    {'osver': '24.04', 'pkgname': 'aspnetcore-targeting-pack-8.0', 'pkgver': '8.0.26-0ubuntu1~24.04.1'},
    {'osver': '24.04', 'pkgname': 'dotnet-apphost-pack-10.0', 'pkgver': '10.0.6-0ubuntu1~24.04.1'},
    {'osver': '24.04', 'pkgname': 'dotnet-apphost-pack-8.0', 'pkgver': '8.0.26-0ubuntu1~24.04.1'},
    {'osver': '24.04', 'pkgname': 'dotnet-host-10.0', 'pkgver': '10.0.6-0ubuntu1~24.04.1'},
    {'osver': '24.04', 'pkgname': 'dotnet-host-8.0', 'pkgver': '8.0.26-0ubuntu1~24.04.1'},
    {'osver': '24.04', 'pkgname': 'dotnet-hostfxr-10.0', 'pkgver': '10.0.6-0ubuntu1~24.04.1'},
    {'osver': '24.04', 'pkgname': 'dotnet-hostfxr-8.0', 'pkgver': '8.0.26-0ubuntu1~24.04.1'},
    {'osver': '24.04', 'pkgname': 'dotnet-runtime-10.0', 'pkgver': '10.0.6-0ubuntu1~24.04.1'},
    {'osver': '24.04', 'pkgname': 'dotnet-runtime-8.0', 'pkgver': '8.0.26-0ubuntu1~24.04.1'},
    {'osver': '24.04', 'pkgname': 'dotnet-runtime-dbg-10.0', 'pkgver': '10.0.6-0ubuntu1~24.04.1'},
    {'osver': '24.04', 'pkgname': 'dotnet-runtime-dbg-8.0', 'pkgver': '8.0.26-0ubuntu1~24.04.1'},
    {'osver': '24.04', 'pkgname': 'dotnet-sdk-10.0', 'pkgver': '10.0.106-0ubuntu1~24.04.1'},
    {'osver': '24.04', 'pkgname': 'dotnet-sdk-10.0-source-built-artifacts', 'pkgver': '10.0.106-0ubuntu1~24.04.1'},
    {'osver': '24.04', 'pkgname': 'dotnet-sdk-8.0', 'pkgver': '8.0.126-0ubuntu1~24.04.1'},
    {'osver': '24.04', 'pkgname': 'dotnet-sdk-8.0-source-built-artifacts', 'pkgver': '8.0.126-0ubuntu1~24.04.1'},
    {'osver': '24.04', 'pkgname': 'dotnet-sdk-aot-10.0', 'pkgver': '10.0.106-0ubuntu1~24.04.1'},
    {'osver': '24.04', 'pkgname': 'dotnet-sdk-dbg-10.0', 'pkgver': '10.0.106-0ubuntu1~24.04.1'},
    {'osver': '24.04', 'pkgname': 'dotnet-sdk-dbg-8.0', 'pkgver': '8.0.126-0ubuntu1~24.04.1'},
    {'osver': '24.04', 'pkgname': 'dotnet-targeting-pack-10.0', 'pkgver': '10.0.6-0ubuntu1~24.04.1'},
    {'osver': '24.04', 'pkgname': 'dotnet-targeting-pack-8.0', 'pkgver': '8.0.26-0ubuntu1~24.04.1'},
    {'osver': '24.04', 'pkgname': 'dotnet-templates-10.0', 'pkgver': '10.0.106-0ubuntu1~24.04.1'},
    {'osver': '24.04', 'pkgname': 'dotnet-templates-8.0', 'pkgver': '8.0.126-0ubuntu1~24.04.1'},
    {'osver': '24.04', 'pkgname': 'dotnet10', 'pkgver': '10.0.106-10.0.6-0ubuntu1~24.04.1'},
    {'osver': '24.04', 'pkgname': 'dotnet8', 'pkgver': '8.0.126-8.0.26-0ubuntu1~24.04.1'},
    {'osver': '24.04', 'pkgname': 'netstandard-targeting-pack-2.1-8.0', 'pkgver': '8.0.126-0ubuntu1~24.04.1'},
    {'osver': '25.10', 'pkgname': 'aspnetcore-runtime-10.0', 'pkgver': '10.0.6-0ubuntu1~25.10.1'},
    {'osver': '25.10', 'pkgname': 'aspnetcore-runtime-8.0', 'pkgver': '8.0.26-0ubuntu1~25.10.1'},
    {'osver': '25.10', 'pkgname': 'aspnetcore-runtime-9.0', 'pkgver': '9.0.15-0ubuntu1~25.10.1'},
    {'osver': '25.10', 'pkgname': 'aspnetcore-runtime-dbg-10.0', 'pkgver': '10.0.6-0ubuntu1~25.10.1'},
    {'osver': '25.10', 'pkgname': 'aspnetcore-runtime-dbg-8.0', 'pkgver': '8.0.26-0ubuntu1~25.10.1'},
    {'osver': '25.10', 'pkgname': 'aspnetcore-runtime-dbg-9.0', 'pkgver': '9.0.15-0ubuntu1~25.10.1'},
    {'osver': '25.10', 'pkgname': 'aspnetcore-targeting-pack-10.0', 'pkgver': '10.0.6-0ubuntu1~25.10.1'},
    {'osver': '25.10', 'pkgname': 'aspnetcore-targeting-pack-8.0', 'pkgver': '8.0.26-0ubuntu1~25.10.1'},
    {'osver': '25.10', 'pkgname': 'aspnetcore-targeting-pack-9.0', 'pkgver': '9.0.15-0ubuntu1~25.10.1'},
    {'osver': '25.10', 'pkgname': 'dotnet-apphost-pack-10.0', 'pkgver': '10.0.6-0ubuntu1~25.10.1'},
    {'osver': '25.10', 'pkgname': 'dotnet-apphost-pack-8.0', 'pkgver': '8.0.26-0ubuntu1~25.10.1'},
    {'osver': '25.10', 'pkgname': 'dotnet-apphost-pack-9.0', 'pkgver': '9.0.15-0ubuntu1~25.10.1'},
    {'osver': '25.10', 'pkgname': 'dotnet-host-10.0', 'pkgver': '10.0.6-0ubuntu1~25.10.1'},
    {'osver': '25.10', 'pkgname': 'dotnet-host-8.0', 'pkgver': '8.0.26-0ubuntu1~25.10.1'},
    {'osver': '25.10', 'pkgname': 'dotnet-host-9.0', 'pkgver': '9.0.15-0ubuntu1~25.10.1'},
    {'osver': '25.10', 'pkgname': 'dotnet-hostfxr-10.0', 'pkgver': '10.0.6-0ubuntu1~25.10.1'},
    {'osver': '25.10', 'pkgname': 'dotnet-hostfxr-8.0', 'pkgver': '8.0.26-0ubuntu1~25.10.1'},
    {'osver': '25.10', 'pkgname': 'dotnet-hostfxr-9.0', 'pkgver': '9.0.15-0ubuntu1~25.10.1'},
    {'osver': '25.10', 'pkgname': 'dotnet-runtime-10.0', 'pkgver': '10.0.6-0ubuntu1~25.10.1'},
    {'osver': '25.10', 'pkgname': 'dotnet-runtime-8.0', 'pkgver': '8.0.26-0ubuntu1~25.10.1'},
    {'osver': '25.10', 'pkgname': 'dotnet-runtime-9.0', 'pkgver': '9.0.15-0ubuntu1~25.10.1'},
    {'osver': '25.10', 'pkgname': 'dotnet-runtime-dbg-10.0', 'pkgver': '10.0.6-0ubuntu1~25.10.1'},
    {'osver': '25.10', 'pkgname': 'dotnet-runtime-dbg-8.0', 'pkgver': '8.0.26-0ubuntu1~25.10.1'},
    {'osver': '25.10', 'pkgname': 'dotnet-runtime-dbg-9.0', 'pkgver': '9.0.15-0ubuntu1~25.10.1'},
    {'osver': '25.10', 'pkgname': 'dotnet-sdk-10.0', 'pkgver': '10.0.106-0ubuntu1~25.10.1'},
    {'osver': '25.10', 'pkgname': 'dotnet-sdk-10.0-source-built-artifacts', 'pkgver': '10.0.106-0ubuntu1~25.10.1'},
    {'osver': '25.10', 'pkgname': 'dotnet-sdk-8.0', 'pkgver': '8.0.126-0ubuntu1~25.10.1'},
    {'osver': '25.10', 'pkgname': 'dotnet-sdk-8.0-source-built-artifacts', 'pkgver': '8.0.126-0ubuntu1~25.10.1'},
    {'osver': '25.10', 'pkgname': 'dotnet-sdk-9.0', 'pkgver': '9.0.116-0ubuntu1~25.10.1'},
    {'osver': '25.10', 'pkgname': 'dotnet-sdk-9.0-source-built-artifacts', 'pkgver': '9.0.116-0ubuntu1~25.10.1'},
    {'osver': '25.10', 'pkgname': 'dotnet-sdk-aot-10.0', 'pkgver': '10.0.106-0ubuntu1~25.10.1'},
    {'osver': '25.10', 'pkgname': 'dotnet-sdk-aot-9.0', 'pkgver': '9.0.116-0ubuntu1~25.10.1'},
    {'osver': '25.10', 'pkgname': 'dotnet-sdk-dbg-10.0', 'pkgver': '10.0.106-0ubuntu1~25.10.1'},
    {'osver': '25.10', 'pkgname': 'dotnet-sdk-dbg-8.0', 'pkgver': '8.0.126-0ubuntu1~25.10.1'},
    {'osver': '25.10', 'pkgname': 'dotnet-sdk-dbg-9.0', 'pkgver': '9.0.116-0ubuntu1~25.10.1'},
    {'osver': '25.10', 'pkgname': 'dotnet-targeting-pack-10.0', 'pkgver': '10.0.6-0ubuntu1~25.10.1'},
    {'osver': '25.10', 'pkgname': 'dotnet-targeting-pack-8.0', 'pkgver': '8.0.26-0ubuntu1~25.10.1'},
    {'osver': '25.10', 'pkgname': 'dotnet-targeting-pack-9.0', 'pkgver': '9.0.15-0ubuntu1~25.10.1'},
    {'osver': '25.10', 'pkgname': 'dotnet-templates-10.0', 'pkgver': '10.0.106-0ubuntu1~25.10.1'},
    {'osver': '25.10', 'pkgname': 'dotnet-templates-8.0', 'pkgver': '8.0.126-0ubuntu1~25.10.1'},
    {'osver': '25.10', 'pkgname': 'dotnet-templates-9.0', 'pkgver': '9.0.116-0ubuntu1~25.10.1'},
    {'osver': '25.10', 'pkgname': 'dotnet10', 'pkgver': '10.0.106-10.0.6-0ubuntu1~25.10.1'},
    {'osver': '25.10', 'pkgname': 'dotnet8', 'pkgver': '8.0.126-8.0.26-0ubuntu1~25.10.1'},
    {'osver': '25.10', 'pkgname': 'dotnet9', 'pkgver': '9.0.116-9.0.15-0ubuntu1~25.10.1'},
    {'osver': '25.10', 'pkgname': 'netstandard-targeting-pack-2.1-8.0', 'pkgver': '8.0.126-0ubuntu1~25.10.1'},
    {'osver': '25.10', 'pkgname': 'netstandard-targeting-pack-2.1-9.0', 'pkgver': '9.0.116-0ubuntu1~25.10.1'}
];

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_HOLE,
    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');
}