Ubuntu 22.04 LTS / 24.04 LTS / 25.10 : .NET vulnerabilities (USN-8085-1)

#%NASL_MIN_LEVEL 80900
##
# (C) Tenable, Inc.
#
# The descriptive text and package checks in this plugin were
# extracted from Ubuntu Security Notice USN-8085-1. 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(302215);
  script_version("1.1");
  script_set_attribute(attribute:"plugin_modification_date", value:"2026/03/13");

  script_cve_id("CVE-2026-26127", "CVE-2026-26130");
  script_xref(name:"USN", value:"8085-1");

  script_name(english:"Ubuntu 22.04 LTS / 24.04 LTS / 25.10 : .NET vulnerabilities (USN-8085-1)");

  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-8085-1 advisory.

    It was discovered that the .NET Microsoft.Bcl.Memory NuGet package did not properly handle certain
    malformed Base64Url encoded input. An attacker could possibly use this issue to cause .NET to crash,
    resulting in a denial of service. This issue only affected .NET 9.0 and .NET 10.0. (CVE-2026-26127)

    Bartomiej Dach discovered that .NET's SignalR server component did not properly manage resource
    consumption when processing certain messages. An attacker could possibly use this issue to exhaust
    internal buffers, resulting in a denial of service. (CVE-2026-26130)

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-8085-1");
  script_set_attribute(attribute:"solution", value:
"Update the affected packages.");
  script_set_cvss_base_vector("CVSS2#AV:N/AC:L/Au:N/C:N/I:N/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: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-2026-26130");

  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:"2026/03/10");
  script_set_attribute(attribute:"patch_publication_date", value:"2026/03/11");
  script_set_attribute(attribute:"plugin_publication_date", value:"2026/03/13");

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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': '8.0.25-0ubuntu1~22.04.1'},
    {'osver': '22.04', 'pkgname': 'aspnetcore-runtime-dbg-8.0', 'pkgver': '8.0.25-0ubuntu1~22.04.1'},
    {'osver': '22.04', 'pkgname': 'aspnetcore-targeting-pack-8.0', 'pkgver': '8.0.25-0ubuntu1~22.04.1'},
    {'osver': '22.04', 'pkgname': 'dotnet-apphost-pack-8.0', 'pkgver': '8.0.25-0ubuntu1~22.04.1'},
    {'osver': '22.04', 'pkgname': 'dotnet-host-8.0', 'pkgver': '8.0.25-0ubuntu1~22.04.1'},
    {'osver': '22.04', 'pkgname': 'dotnet-hostfxr-8.0', 'pkgver': '8.0.25-0ubuntu1~22.04.1'},
    {'osver': '22.04', 'pkgname': 'dotnet-runtime-8.0', 'pkgver': '8.0.25-0ubuntu1~22.04.1'},
    {'osver': '22.04', 'pkgname': 'dotnet-runtime-dbg-8.0', 'pkgver': '8.0.25-0ubuntu1~22.04.1'},
    {'osver': '22.04', 'pkgname': 'dotnet-sdk-8.0', 'pkgver': '8.0.125-0ubuntu1~22.04.1'},
    {'osver': '22.04', 'pkgname': 'dotnet-sdk-8.0-source-built-artifacts', 'pkgver': '8.0.125-0ubuntu1~22.04.1'},
    {'osver': '22.04', 'pkgname': 'dotnet-sdk-dbg-8.0', 'pkgver': '8.0.125-0ubuntu1~22.04.1'},
    {'osver': '22.04', 'pkgname': 'dotnet-targeting-pack-8.0', 'pkgver': '8.0.25-0ubuntu1~22.04.1'},
    {'osver': '22.04', 'pkgname': 'dotnet-templates-8.0', 'pkgver': '8.0.125-0ubuntu1~22.04.1'},
    {'osver': '22.04', 'pkgname': 'dotnet8', 'pkgver': '8.0.125-8.0.25-0ubuntu1~22.04.1'},
    {'osver': '22.04', 'pkgname': 'netstandard-targeting-pack-2.1-8.0', 'pkgver': '8.0.125-0ubuntu1~22.04.1'},
    {'osver': '24.04', 'pkgname': 'aspnetcore-runtime-10.0', 'pkgver': '10.0.4-0ubuntu1~24.04.1'},
    {'osver': '24.04', 'pkgname': 'aspnetcore-runtime-8.0', 'pkgver': '8.0.25-0ubuntu1~24.04.1'},
    {'osver': '24.04', 'pkgname': 'aspnetcore-runtime-dbg-10.0', 'pkgver': '10.0.4-0ubuntu1~24.04.1'},
    {'osver': '24.04', 'pkgname': 'aspnetcore-runtime-dbg-8.0', 'pkgver': '8.0.25-0ubuntu1~24.04.1'},
    {'osver': '24.04', 'pkgname': 'aspnetcore-targeting-pack-10.0', 'pkgver': '10.0.4-0ubuntu1~24.04.1'},
    {'osver': '24.04', 'pkgname': 'aspnetcore-targeting-pack-8.0', 'pkgver': '8.0.25-0ubuntu1~24.04.1'},
    {'osver': '24.04', 'pkgname': 'dotnet-apphost-pack-10.0', 'pkgver': '10.0.4-0ubuntu1~24.04.1'},
    {'osver': '24.04', 'pkgname': 'dotnet-apphost-pack-8.0', 'pkgver': '8.0.25-0ubuntu1~24.04.1'},
    {'osver': '24.04', 'pkgname': 'dotnet-host-10.0', 'pkgver': '10.0.4-0ubuntu1~24.04.1'},
    {'osver': '24.04', 'pkgname': 'dotnet-host-8.0', 'pkgver': '8.0.25-0ubuntu1~24.04.1'},
    {'osver': '24.04', 'pkgname': 'dotnet-hostfxr-10.0', 'pkgver': '10.0.4-0ubuntu1~24.04.1'},
    {'osver': '24.04', 'pkgname': 'dotnet-hostfxr-8.0', 'pkgver': '8.0.25-0ubuntu1~24.04.1'},
    {'osver': '24.04', 'pkgname': 'dotnet-runtime-10.0', 'pkgver': '10.0.4-0ubuntu1~24.04.1'},
    {'osver': '24.04', 'pkgname': 'dotnet-runtime-8.0', 'pkgver': '8.0.25-0ubuntu1~24.04.1'},
    {'osver': '24.04', 'pkgname': 'dotnet-runtime-dbg-10.0', 'pkgver': '10.0.4-0ubuntu1~24.04.1'},
    {'osver': '24.04', 'pkgname': 'dotnet-runtime-dbg-8.0', 'pkgver': '8.0.25-0ubuntu1~24.04.1'},
    {'osver': '24.04', 'pkgname': 'dotnet-sdk-10.0', 'pkgver': '10.0.104-0ubuntu1~24.04.1'},
    {'osver': '24.04', 'pkgname': 'dotnet-sdk-10.0-source-built-artifacts', 'pkgver': '10.0.104-0ubuntu1~24.04.1'},
    {'osver': '24.04', 'pkgname': 'dotnet-sdk-8.0', 'pkgver': '8.0.125-0ubuntu1~24.04.1'},
    {'osver': '24.04', 'pkgname': 'dotnet-sdk-8.0-source-built-artifacts', 'pkgver': '8.0.125-0ubuntu1~24.04.1'},
    {'osver': '24.04', 'pkgname': 'dotnet-sdk-aot-10.0', 'pkgver': '10.0.104-0ubuntu1~24.04.1'},
    {'osver': '24.04', 'pkgname': 'dotnet-sdk-dbg-10.0', 'pkgver': '10.0.104-0ubuntu1~24.04.1'},
    {'osver': '24.04', 'pkgname': 'dotnet-sdk-dbg-8.0', 'pkgver': '8.0.125-0ubuntu1~24.04.1'},
    {'osver': '24.04', 'pkgname': 'dotnet-targeting-pack-10.0', 'pkgver': '10.0.4-0ubuntu1~24.04.1'},
    {'osver': '24.04', 'pkgname': 'dotnet-targeting-pack-8.0', 'pkgver': '8.0.25-0ubuntu1~24.04.1'},
    {'osver': '24.04', 'pkgname': 'dotnet-templates-10.0', 'pkgver': '10.0.104-0ubuntu1~24.04.1'},
    {'osver': '24.04', 'pkgname': 'dotnet-templates-8.0', 'pkgver': '8.0.125-0ubuntu1~24.04.1'},
    {'osver': '24.04', 'pkgname': 'dotnet10', 'pkgver': '10.0.104-10.0.4-0ubuntu1~24.04.1'},
    {'osver': '24.04', 'pkgname': 'dotnet8', 'pkgver': '8.0.125-8.0.25-0ubuntu1~24.04.1'},
    {'osver': '24.04', 'pkgname': 'netstandard-targeting-pack-2.1-8.0', 'pkgver': '8.0.125-0ubuntu1~24.04.1'},
    {'osver': '25.10', 'pkgname': 'aspnetcore-runtime-10.0', 'pkgver': '10.0.4-0ubuntu1~25.10.1'},
    {'osver': '25.10', 'pkgname': 'aspnetcore-runtime-8.0', 'pkgver': '8.0.25-0ubuntu1~25.10.1'},
    {'osver': '25.10', 'pkgname': 'aspnetcore-runtime-9.0', 'pkgver': '9.0.14-0ubuntu1~25.10.1'},
    {'osver': '25.10', 'pkgname': 'aspnetcore-runtime-dbg-10.0', 'pkgver': '10.0.4-0ubuntu1~25.10.1'},
    {'osver': '25.10', 'pkgname': 'aspnetcore-runtime-dbg-8.0', 'pkgver': '8.0.25-0ubuntu1~25.10.1'},
    {'osver': '25.10', 'pkgname': 'aspnetcore-runtime-dbg-9.0', 'pkgver': '9.0.14-0ubuntu1~25.10.1'},
    {'osver': '25.10', 'pkgname': 'aspnetcore-targeting-pack-10.0', 'pkgver': '10.0.4-0ubuntu1~25.10.1'},
    {'osver': '25.10', 'pkgname': 'aspnetcore-targeting-pack-8.0', 'pkgver': '8.0.25-0ubuntu1~25.10.1'},
    {'osver': '25.10', 'pkgname': 'aspnetcore-targeting-pack-9.0', 'pkgver': '9.0.14-0ubuntu1~25.10.1'},
    {'osver': '25.10', 'pkgname': 'dotnet-apphost-pack-10.0', 'pkgver': '10.0.4-0ubuntu1~25.10.1'},
    {'osver': '25.10', 'pkgname': 'dotnet-apphost-pack-8.0', 'pkgver': '8.0.25-0ubuntu1~25.10.1'},
    {'osver': '25.10', 'pkgname': 'dotnet-apphost-pack-9.0', 'pkgver': '9.0.14-0ubuntu1~25.10.1'},
    {'osver': '25.10', 'pkgname': 'dotnet-host-10.0', 'pkgver': '10.0.4-0ubuntu1~25.10.1'},
    {'osver': '25.10', 'pkgname': 'dotnet-host-8.0', 'pkgver': '8.0.25-0ubuntu1~25.10.1'},
    {'osver': '25.10', 'pkgname': 'dotnet-host-9.0', 'pkgver': '9.0.14-0ubuntu1~25.10.1'},
    {'osver': '25.10', 'pkgname': 'dotnet-hostfxr-10.0', 'pkgver': '10.0.4-0ubuntu1~25.10.1'},
    {'osver': '25.10', 'pkgname': 'dotnet-hostfxr-8.0', 'pkgver': '8.0.25-0ubuntu1~25.10.1'},
    {'osver': '25.10', 'pkgname': 'dotnet-hostfxr-9.0', 'pkgver': '9.0.14-0ubuntu1~25.10.1'},
    {'osver': '25.10', 'pkgname': 'dotnet-runtime-10.0', 'pkgver': '10.0.4-0ubuntu1~25.10.1'},
    {'osver': '25.10', 'pkgname': 'dotnet-runtime-8.0', 'pkgver': '8.0.25-0ubuntu1~25.10.1'},
    {'osver': '25.10', 'pkgname': 'dotnet-runtime-9.0', 'pkgver': '9.0.14-0ubuntu1~25.10.1'},
    {'osver': '25.10', 'pkgname': 'dotnet-runtime-dbg-10.0', 'pkgver': '10.0.4-0ubuntu1~25.10.1'},
    {'osver': '25.10', 'pkgname': 'dotnet-runtime-dbg-8.0', 'pkgver': '8.0.25-0ubuntu1~25.10.1'},
    {'osver': '25.10', 'pkgname': 'dotnet-runtime-dbg-9.0', 'pkgver': '9.0.14-0ubuntu1~25.10.1'},
    {'osver': '25.10', 'pkgname': 'dotnet-sdk-10.0', 'pkgver': '10.0.104-0ubuntu1~25.10.1'},
    {'osver': '25.10', 'pkgname': 'dotnet-sdk-10.0-source-built-artifacts', 'pkgver': '10.0.104-0ubuntu1~25.10.1'},
    {'osver': '25.10', 'pkgname': 'dotnet-sdk-8.0', 'pkgver': '8.0.125-0ubuntu1~25.10.1'},
    {'osver': '25.10', 'pkgname': 'dotnet-sdk-8.0-source-built-artifacts', 'pkgver': '8.0.125-0ubuntu1~25.10.1'},
    {'osver': '25.10', 'pkgname': 'dotnet-sdk-9.0', 'pkgver': '9.0.115-0ubuntu1~25.10.1'},
    {'osver': '25.10', 'pkgname': 'dotnet-sdk-9.0-source-built-artifacts', 'pkgver': '9.0.115-0ubuntu1~25.10.1'},
    {'osver': '25.10', 'pkgname': 'dotnet-sdk-aot-10.0', 'pkgver': '10.0.104-0ubuntu1~25.10.1'},
    {'osver': '25.10', 'pkgname': 'dotnet-sdk-aot-9.0', 'pkgver': '9.0.115-0ubuntu1~25.10.1'},
    {'osver': '25.10', 'pkgname': 'dotnet-sdk-dbg-10.0', 'pkgver': '10.0.104-0ubuntu1~25.10.1'},
    {'osver': '25.10', 'pkgname': 'dotnet-sdk-dbg-8.0', 'pkgver': '8.0.125-0ubuntu1~25.10.1'},
    {'osver': '25.10', 'pkgname': 'dotnet-sdk-dbg-9.0', 'pkgver': '9.0.115-0ubuntu1~25.10.1'},
    {'osver': '25.10', 'pkgname': 'dotnet-targeting-pack-10.0', 'pkgver': '10.0.4-0ubuntu1~25.10.1'},
    {'osver': '25.10', 'pkgname': 'dotnet-targeting-pack-8.0', 'pkgver': '8.0.25-0ubuntu1~25.10.1'},
    {'osver': '25.10', 'pkgname': 'dotnet-targeting-pack-9.0', 'pkgver': '9.0.14-0ubuntu1~25.10.1'},
    {'osver': '25.10', 'pkgname': 'dotnet-templates-10.0', 'pkgver': '10.0.104-0ubuntu1~25.10.1'},
    {'osver': '25.10', 'pkgname': 'dotnet-templates-8.0', 'pkgver': '8.0.125-0ubuntu1~25.10.1'},
    {'osver': '25.10', 'pkgname': 'dotnet-templates-9.0', 'pkgver': '9.0.115-0ubuntu1~25.10.1'},
    {'osver': '25.10', 'pkgname': 'dotnet10', 'pkgver': '10.0.104-10.0.4-0ubuntu1~25.10.1'},
    {'osver': '25.10', 'pkgname': 'dotnet8', 'pkgver': '8.0.125-8.0.25-0ubuntu1~25.10.1'},
    {'osver': '25.10', 'pkgname': 'dotnet9', 'pkgver': '9.0.115-9.0.14-0ubuntu1~25.10.1'},
    {'osver': '25.10', 'pkgname': 'netstandard-targeting-pack-2.1-8.0', 'pkgver': '8.0.125-0ubuntu1~25.10.1'},
    {'osver': '25.10', 'pkgname': 'netstandard-targeting-pack-2.1-9.0', 'pkgver': '9.0.115-0ubuntu1~25.10.1'}
];

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');
}