Ubuntu 22.04 LTS / 24.04 LTS / 26.04 LTS : .NET vulnerabilities (USN-8553-1)

#%NASL_MIN_LEVEL 80900
##
# (C) Tenable, Inc.
#
# The descriptive text and package checks in this plugin were
# extracted from Ubuntu Security Notice USN-8553-1. 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(327336);
  script_version("1.1");
  script_set_attribute(attribute:"plugin_modification_date", value:"2026/07/16");

  script_cve_id(
    "CVE-2026-47300",
    "CVE-2026-47302",
    "CVE-2026-47303",
    "CVE-2026-47304",
    "CVE-2026-50524",
    "CVE-2026-50525",
    "CVE-2026-50526",
    "CVE-2026-50527",
    "CVE-2026-50528",
    "CVE-2026-50648",
    "CVE-2026-50651",
    "CVE-2026-50659",
    "CVE-2026-57108"
  );
  script_xref(name:"USN", value:"8553-1");

  script_name(english:"Ubuntu 22.04 LTS / 24.04 LTS / 26.04 LTS : .NET vulnerabilities (USN-8553-1)");

  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 / 26.04 LTS host has packages installed that are affected by multiple
vulnerabilities as referenced in the USN-8553-1 advisory.

    Artur Stetsko discovered that the .NET did not properly validate authentication data. An attacker could
    possibly use this issue to elevate privileges. (CVE-2026-47300)

    Levi Broderick discovered that .NET did not properly handle XML encryption during parsing. An attacker
    could possibly use this issue to consume excessive resources, resulting in a denial of service.
    (CVE-2026-47302)

    Pham Quang Minh discovered that .NET did not properly parse authentication data. An attacker could
    possibly use this issue to bypass authentication and elevate privileges. (CVE-2026-47303)

    Levi Broderick discovered that .NET did not properly verify cryptographic signatures during XML
    encryption. An attacker could possibly use this issue to bypass security features over a network and
    access encrypted data. (CVE-2026-47304)

    It was discovered that .NET did not properly validate input during TLS handshakes. An attacker could
    possibly use this issue to cause .NET to crash, resulting in a denial of service. (CVE-2026-50524)

    Levi Broderick discovered that .NET did not properly handle resource allocation during XML encryption. An
    attacker could possibly use this issue to consume excessive resources, resulting in a denial of service.
    (CVE-2026-50525)

    Siwei Li discovered that .NET did not properly handle link resolution before file access during the
    container image build process. A local attacker could possibly use this issue to inject resources that
    could be incorporated into container images built by other users on the same machine. (CVE-2026-50526)

    Levi Broderick discovered that .NET did not properly handle memory while performing XML encryption. An
    attacker could possibly use this issue to cause .NET to crash, resulting in a denial of service.
    (CVE-2026-50527)

    Henrique Pereira discovered that .NET did not properly handle authorization checks during TLS/SSL
    connections. An attacker could possibly use this issue to bypass authorization checks during secure
    communications. (CVE-2026-50528)

    It was discovered that .NET did not properly handle resource allocation during XML encryption. An attacker
    could possibly use this issue to consume excessive resources, resulting in a denial of service.
    (CVE-2026-50648)

    Miha Zupan discovered that .NET did not properly limit resource allocation when handling HTTP/2 requests.
    An attacker could possibly use this issue to consume excessive resources, resulting in a denial of
    service. (CVE-2026-50651)

    It was discovered that the .NET SMTP client did not properly handle the encoding or escaping of output. An
    attacker could possibly use this issue to spoof messages during message routing. (CVE-2026-50659)

    It was discovered that .NET did not properly validate resource types when parsing X.509 certificates. An
    attacker could possibly use this issue to cause .NET to crash, resulting in a denial of service.
    (CVE-2026-57108)

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-8553-1");
  script_set_attribute(attribute:"solution", value:
"Update the affected packages.");
  script_set_cvss_base_vector("CVSS2#AV:N/AC:L/Au:S/C:C/I:C/A:C");
  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:L/UI:N/S:U/C:H/I:H/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-2026-47303");

  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:"2026/07/14");
  script_set_attribute(attribute:"patch_publication_date", value:"2026/07/15");
  script_set_attribute(attribute:"plugin_publication_date", value:"2026/07/16");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:canonical:ubuntu_linux:22.04:-:lts");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:canonical:ubuntu_linux:24.04:-:lts");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:canonical:ubuntu_linux:26.04:-:lts");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:aspnetcore-runtime-10.0");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:aspnetcore-runtime-8.0");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:aspnetcore-runtime-dbg-10.0");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:aspnetcore-runtime-dbg-8.0");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:aspnetcore-targeting-pack-10.0");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:aspnetcore-targeting-pack-8.0");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:dotnet-apphost-pack-10.0");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:dotnet-apphost-pack-8.0");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:dotnet-host-10.0");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:dotnet-host-8.0");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:dotnet-hostfxr-10.0");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:dotnet-hostfxr-8.0");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:dotnet-runtime-10.0");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:dotnet-runtime-8.0");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:dotnet-runtime-dbg-10.0");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:dotnet-runtime-dbg-8.0");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:dotnet-sdk-10.0");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:dotnet-sdk-10.0-source-built-artifacts");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:dotnet-sdk-8.0");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:dotnet-sdk-8.0-source-built-artifacts");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:dotnet-sdk-aot-10.0");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:dotnet-sdk-dbg-10.0");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:dotnet-sdk-dbg-8.0");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:dotnet-targeting-pack-10.0");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:dotnet-targeting-pack-8.0");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:dotnet-templates-10.0");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:dotnet-templates-8.0");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:dotnet10");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:dotnet8");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:netstandard-targeting-pack-2.1-8.0");
  script_set_attribute(attribute:"generated_plugin", value:"current");
  script_end_attributes();

  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 || '26.04' >< os_release)) audit(AUDIT_OS_NOT, 'Ubuntu 22.04 / 24.04 / 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': '8.0.29-0ubuntu1~22.04.1'},
    {'osver': '22.04', 'pkgname': 'aspnetcore-runtime-dbg-8.0', 'pkgver': '8.0.29-0ubuntu1~22.04.1'},
    {'osver': '22.04', 'pkgname': 'aspnetcore-targeting-pack-8.0', 'pkgver': '8.0.29-0ubuntu1~22.04.1'},
    {'osver': '22.04', 'pkgname': 'dotnet-apphost-pack-8.0', 'pkgver': '8.0.29-0ubuntu1~22.04.1'},
    {'osver': '22.04', 'pkgname': 'dotnet-host-8.0', 'pkgver': '8.0.29-0ubuntu1~22.04.1'},
    {'osver': '22.04', 'pkgname': 'dotnet-hostfxr-8.0', 'pkgver': '8.0.29-0ubuntu1~22.04.1'},
    {'osver': '22.04', 'pkgname': 'dotnet-runtime-8.0', 'pkgver': '8.0.29-0ubuntu1~22.04.1'},
    {'osver': '22.04', 'pkgname': 'dotnet-runtime-dbg-8.0', 'pkgver': '8.0.29-0ubuntu1~22.04.1'},
    {'osver': '22.04', 'pkgname': 'dotnet-sdk-8.0', 'pkgver': '8.0.129-0ubuntu1~22.04.1'},
    {'osver': '22.04', 'pkgname': 'dotnet-sdk-8.0-source-built-artifacts', 'pkgver': '8.0.129-0ubuntu1~22.04.1'},
    {'osver': '22.04', 'pkgname': 'dotnet-sdk-dbg-8.0', 'pkgver': '8.0.129-0ubuntu1~22.04.1'},
    {'osver': '22.04', 'pkgname': 'dotnet-targeting-pack-8.0', 'pkgver': '8.0.29-0ubuntu1~22.04.1'},
    {'osver': '22.04', 'pkgname': 'dotnet-templates-8.0', 'pkgver': '8.0.129-0ubuntu1~22.04.1'},
    {'osver': '22.04', 'pkgname': 'dotnet8', 'pkgver': '8.0.129-8.0.29-0ubuntu1~22.04.1'},
    {'osver': '22.04', 'pkgname': 'netstandard-targeting-pack-2.1-8.0', 'pkgver': '8.0.129-0ubuntu1~22.04.1'},
    {'osver': '24.04', 'pkgname': 'aspnetcore-runtime-10.0', 'pkgver': '10.0.10-0ubuntu1~24.04.1'},
    {'osver': '24.04', 'pkgname': 'aspnetcore-runtime-8.0', 'pkgver': '8.0.29-0ubuntu1~24.04.1'},
    {'osver': '24.04', 'pkgname': 'aspnetcore-runtime-dbg-10.0', 'pkgver': '10.0.10-0ubuntu1~24.04.1'},
    {'osver': '24.04', 'pkgname': 'aspnetcore-runtime-dbg-8.0', 'pkgver': '8.0.29-0ubuntu1~24.04.1'},
    {'osver': '24.04', 'pkgname': 'aspnetcore-targeting-pack-10.0', 'pkgver': '10.0.10-0ubuntu1~24.04.1'},
    {'osver': '24.04', 'pkgname': 'aspnetcore-targeting-pack-8.0', 'pkgver': '8.0.29-0ubuntu1~24.04.1'},
    {'osver': '24.04', 'pkgname': 'dotnet-apphost-pack-10.0', 'pkgver': '10.0.10-0ubuntu1~24.04.1'},
    {'osver': '24.04', 'pkgname': 'dotnet-apphost-pack-8.0', 'pkgver': '8.0.29-0ubuntu1~24.04.1'},
    {'osver': '24.04', 'pkgname': 'dotnet-host-10.0', 'pkgver': '10.0.10-0ubuntu1~24.04.1'},
    {'osver': '24.04', 'pkgname': 'dotnet-host-8.0', 'pkgver': '8.0.29-0ubuntu1~24.04.1'},
    {'osver': '24.04', 'pkgname': 'dotnet-hostfxr-10.0', 'pkgver': '10.0.10-0ubuntu1~24.04.1'},
    {'osver': '24.04', 'pkgname': 'dotnet-hostfxr-8.0', 'pkgver': '8.0.29-0ubuntu1~24.04.1'},
    {'osver': '24.04', 'pkgname': 'dotnet-runtime-10.0', 'pkgver': '10.0.10-0ubuntu1~24.04.1'},
    {'osver': '24.04', 'pkgname': 'dotnet-runtime-8.0', 'pkgver': '8.0.29-0ubuntu1~24.04.1'},
    {'osver': '24.04', 'pkgname': 'dotnet-runtime-dbg-10.0', 'pkgver': '10.0.10-0ubuntu1~24.04.1'},
    {'osver': '24.04', 'pkgname': 'dotnet-runtime-dbg-8.0', 'pkgver': '8.0.29-0ubuntu1~24.04.1'},
    {'osver': '24.04', 'pkgname': 'dotnet-sdk-10.0', 'pkgver': '10.0.110-0ubuntu1~24.04.1'},
    {'osver': '24.04', 'pkgname': 'dotnet-sdk-10.0-source-built-artifacts', 'pkgver': '10.0.110-0ubuntu1~24.04.1'},
    {'osver': '24.04', 'pkgname': 'dotnet-sdk-8.0', 'pkgver': '8.0.129-0ubuntu1~24.04.1'},
    {'osver': '24.04', 'pkgname': 'dotnet-sdk-8.0-source-built-artifacts', 'pkgver': '8.0.129-0ubuntu1~24.04.1'},
    {'osver': '24.04', 'pkgname': 'dotnet-sdk-aot-10.0', 'pkgver': '10.0.110-0ubuntu1~24.04.1'},
    {'osver': '24.04', 'pkgname': 'dotnet-sdk-dbg-10.0', 'pkgver': '10.0.110-0ubuntu1~24.04.1'},
    {'osver': '24.04', 'pkgname': 'dotnet-sdk-dbg-8.0', 'pkgver': '8.0.129-0ubuntu1~24.04.1'},
    {'osver': '24.04', 'pkgname': 'dotnet-targeting-pack-10.0', 'pkgver': '10.0.10-0ubuntu1~24.04.1'},
    {'osver': '24.04', 'pkgname': 'dotnet-targeting-pack-8.0', 'pkgver': '8.0.29-0ubuntu1~24.04.1'},
    {'osver': '24.04', 'pkgname': 'dotnet-templates-10.0', 'pkgver': '10.0.110-0ubuntu1~24.04.1'},
    {'osver': '24.04', 'pkgname': 'dotnet-templates-8.0', 'pkgver': '8.0.129-0ubuntu1~24.04.1'},
    {'osver': '24.04', 'pkgname': 'dotnet10', 'pkgver': '10.0.110-10.0.10-0ubuntu1~24.04.1'},
    {'osver': '24.04', 'pkgname': 'dotnet8', 'pkgver': '8.0.129-8.0.29-0ubuntu1~24.04.1'},
    {'osver': '24.04', 'pkgname': 'netstandard-targeting-pack-2.1-8.0', 'pkgver': '8.0.129-0ubuntu1~24.04.1'},
    {'osver': '26.04', 'pkgname': 'aspnetcore-runtime-10.0', 'pkgver': '10.0.10-0ubuntu1~26.04.1'},
    {'osver': '26.04', 'pkgname': 'aspnetcore-runtime-dbg-10.0', 'pkgver': '10.0.10-0ubuntu1~26.04.1'},
    {'osver': '26.04', 'pkgname': 'aspnetcore-targeting-pack-10.0', 'pkgver': '10.0.10-0ubuntu1~26.04.1'},
    {'osver': '26.04', 'pkgname': 'dotnet-apphost-pack-10.0', 'pkgver': '10.0.10-0ubuntu1~26.04.1'},
    {'osver': '26.04', 'pkgname': 'dotnet-host-10.0', 'pkgver': '10.0.10-0ubuntu1~26.04.1'},
    {'osver': '26.04', 'pkgname': 'dotnet-hostfxr-10.0', 'pkgver': '10.0.10-0ubuntu1~26.04.1'},
    {'osver': '26.04', 'pkgname': 'dotnet-runtime-10.0', 'pkgver': '10.0.10-0ubuntu1~26.04.1'},
    {'osver': '26.04', 'pkgname': 'dotnet-runtime-dbg-10.0', 'pkgver': '10.0.10-0ubuntu1~26.04.1'},
    {'osver': '26.04', 'pkgname': 'dotnet-sdk-10.0', 'pkgver': '10.0.110-0ubuntu1~26.04.1'},
    {'osver': '26.04', 'pkgname': 'dotnet-sdk-10.0-source-built-artifacts', 'pkgver': '10.0.110-0ubuntu1~26.04.1'},
    {'osver': '26.04', 'pkgname': 'dotnet-sdk-aot-10.0', 'pkgver': '10.0.110-0ubuntu1~26.04.1'},
    {'osver': '26.04', 'pkgname': 'dotnet-sdk-dbg-10.0', 'pkgver': '10.0.110-0ubuntu1~26.04.1'},
    {'osver': '26.04', 'pkgname': 'dotnet-targeting-pack-10.0', 'pkgver': '10.0.10-0ubuntu1~26.04.1'},
    {'osver': '26.04', 'pkgname': 'dotnet-templates-10.0', 'pkgver': '10.0.110-0ubuntu1~26.04.1'},
    {'osver': '26.04', 'pkgname': 'dotnet10', 'pkgver': '10.0.110-10.0.10-0ubuntu1~26.04.1'}
];

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_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');
}