Ubuntu 22.04 LTS / 24.04 LTS / 26.04 LTS / 26.10 : .NET vulnerabilities (USN-8958-1)

#%NASL_MIN_LEVEL 80900
##
# (C) Tenable, Inc.
#
# The descriptive text and package checks in this plugin were
# extracted from Ubuntu Security Notice USN-8958-1. 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(374084);
  script_version("1.1");
  script_set_attribute(attribute:"plugin_modification_date", value:"2026/10/30");

  script_cve_id("CVE-2026-102870", "CVE-2026-111497", "CVE-2026-114148");
  script_xref(name:"CISA-KNOWN-EXPLOITED", value:"2026/11/10");
  script_xref(name:"USN", value:"8958-1");

  script_name(english:"Ubuntu 22.04 LTS / 24.04 LTS / 26.04 LTS / 26.10 : .NET vulnerabilities (USN-8958-1)");

  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 / 26.10 host has packages installed that are affected by multiple
vulnerabilities as referenced in the USN-8958-1 advisory.

    It was discovered that the .NET Blazor WebAssembly debug proxy did not properly escape certain values. An
    attacker could possibly use this issue to execute arbitrary code. The fix for this CVE was originally
    released via USN-8942-1, but it was found to be incomplete. This issue only affected dotnet10 and
    dotnet11. (CVE-2026-102870)

    It was discovered that the Brotli decompression library used by .NET incorrectly handled certain
    compressed streams. A remote attacker could possibly use this issue to cause a denial of service or
    execute arbitrary code. (CVE-2026-111497)

    Alen Cheung discovered that .NET did not properly handle file ownership in certain circumstances. An
    attacker could possibly use this issue to elevate local privileges. (CVE-2026-114148)

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-8958-1");
  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:C/A:C");
  script_set_cvss_temporal_vector("CVSS2#E:H/RL:OF/RC:C");
  script_set_cvss3_base_vector("CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H");
  script_set_cvss3_temporal_vector("CVSS:3.0/E:H/RL:O/RC:C");
  script_set_attribute(attribute:"cvss4_vector", value:"CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N");
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  script_set_attribute(attribute:"exploitability_ease", value:"Exploits are available");
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  script_set_attribute(attribute:"vuln_publication_date", value:"2026/10/13");
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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_info2.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 || '26.10' >< os_release)) audit(AUDIT_OS_NOT, 'Ubuntu 22.04 / 24.04 / 26.04 / 26.10', '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': '8.0.33-0ubuntu1~22.04.1'},
    {'osver': '22.04', 'pkgname': 'aspnetcore-runtime-dbg-8.0', 'pkgver': '8.0.33-0ubuntu1~22.04.1'},
    {'osver': '22.04', 'pkgname': 'aspnetcore-targeting-pack-8.0', 'pkgver': '8.0.33-0ubuntu1~22.04.1'},
    {'osver': '22.04', 'pkgname': 'dotnet-apphost-pack-8.0', 'pkgver': '8.0.33-0ubuntu1~22.04.1'},
    {'osver': '22.04', 'pkgname': 'dotnet-host-8.0', 'pkgver': '8.0.33-0ubuntu1~22.04.1'},
    {'osver': '22.04', 'pkgname': 'dotnet-hostfxr-8.0', 'pkgver': '8.0.33-0ubuntu1~22.04.1'},
    {'osver': '22.04', 'pkgname': 'dotnet-runtime-8.0', 'pkgver': '8.0.33-0ubuntu1~22.04.1'},
    {'osver': '22.04', 'pkgname': 'dotnet-runtime-dbg-8.0', 'pkgver': '8.0.33-0ubuntu1~22.04.1'},
    {'osver': '22.04', 'pkgname': 'dotnet-sdk-8.0', 'pkgver': '8.0.133-0ubuntu1~22.04.1'},
    {'osver': '22.04', 'pkgname': 'dotnet-sdk-8.0-source-built-artifacts', 'pkgver': '8.0.133-0ubuntu1~22.04.1'},
    {'osver': '22.04', 'pkgname': 'dotnet-sdk-dbg-8.0', 'pkgver': '8.0.133-0ubuntu1~22.04.1'},
    {'osver': '22.04', 'pkgname': 'dotnet-targeting-pack-8.0', 'pkgver': '8.0.33-0ubuntu1~22.04.1'},
    {'osver': '22.04', 'pkgname': 'dotnet-templates-8.0', 'pkgver': '8.0.133-0ubuntu1~22.04.1'},
    {'osver': '22.04', 'pkgname': 'dotnet8', 'pkgver': '8.0.133-8.0.33-0ubuntu1~22.04.1'},
    {'osver': '22.04', 'pkgname': 'netstandard-targeting-pack-2.1-8.0', 'pkgver': '8.0.133-0ubuntu1~22.04.1'},
    {'osver': '24.04', 'pkgname': 'aspnetcore-runtime-10.0', 'pkgver': '10.0.14-0ubuntu1~24.04.1'},
    {'osver': '24.04', 'pkgname': 'aspnetcore-runtime-8.0', 'pkgver': '8.0.33-0ubuntu1~24.04.1'},
    {'osver': '24.04', 'pkgname': 'aspnetcore-runtime-dbg-10.0', 'pkgver': '10.0.14-0ubuntu1~24.04.1'},
    {'osver': '24.04', 'pkgname': 'aspnetcore-runtime-dbg-8.0', 'pkgver': '8.0.33-0ubuntu1~24.04.1'},
    {'osver': '24.04', 'pkgname': 'aspnetcore-targeting-pack-10.0', 'pkgver': '10.0.14-0ubuntu1~24.04.1'},
    {'osver': '24.04', 'pkgname': 'aspnetcore-targeting-pack-8.0', 'pkgver': '8.0.33-0ubuntu1~24.04.1'},
    {'osver': '24.04', 'pkgname': 'dotnet-apphost-pack-10.0', 'pkgver': '10.0.14-0ubuntu1~24.04.1'},
    {'osver': '24.04', 'pkgname': 'dotnet-apphost-pack-8.0', 'pkgver': '8.0.33-0ubuntu1~24.04.1'},
    {'osver': '24.04', 'pkgname': 'dotnet-host-10.0', 'pkgver': '10.0.14-0ubuntu1~24.04.1'},
    {'osver': '24.04', 'pkgname': 'dotnet-host-8.0', 'pkgver': '8.0.33-0ubuntu1~24.04.1'},
    {'osver': '24.04', 'pkgname': 'dotnet-hostfxr-10.0', 'pkgver': '10.0.14-0ubuntu1~24.04.1'},
    {'osver': '24.04', 'pkgname': 'dotnet-hostfxr-8.0', 'pkgver': '8.0.33-0ubuntu1~24.04.1'},
    {'osver': '24.04', 'pkgname': 'dotnet-runtime-10.0', 'pkgver': '10.0.14-0ubuntu1~24.04.1'},
    {'osver': '24.04', 'pkgname': 'dotnet-runtime-8.0', 'pkgver': '8.0.33-0ubuntu1~24.04.1'},
    {'osver': '24.04', 'pkgname': 'dotnet-runtime-dbg-10.0', 'pkgver': '10.0.14-0ubuntu1~24.04.1'},
    {'osver': '24.04', 'pkgname': 'dotnet-runtime-dbg-8.0', 'pkgver': '8.0.33-0ubuntu1~24.04.1'},
    {'osver': '24.04', 'pkgname': 'dotnet-sdk-10.0', 'pkgver': '10.0.114-0ubuntu1~24.04.1'},
    {'osver': '24.04', 'pkgname': 'dotnet-sdk-10.0-source-built-artifacts', 'pkgver': '10.0.114-0ubuntu1~24.04.1'},
    {'osver': '24.04', 'pkgname': 'dotnet-sdk-8.0', 'pkgver': '8.0.133-0ubuntu1~24.04.1'},
    {'osver': '24.04', 'pkgname': 'dotnet-sdk-8.0-source-built-artifacts', 'pkgver': '8.0.133-0ubuntu1~24.04.1'},
    {'osver': '24.04', 'pkgname': 'dotnet-sdk-aot-10.0', 'pkgver': '10.0.114-0ubuntu1~24.04.1'},
    {'osver': '24.04', 'pkgname': 'dotnet-sdk-dbg-10.0', 'pkgver': '10.0.114-0ubuntu1~24.04.1'},
    {'osver': '24.04', 'pkgname': 'dotnet-sdk-dbg-8.0', 'pkgver': '8.0.133-0ubuntu1~24.04.1'},
    {'osver': '24.04', 'pkgname': 'dotnet-targeting-pack-10.0', 'pkgver': '10.0.14-0ubuntu1~24.04.1'},
    {'osver': '24.04', 'pkgname': 'dotnet-targeting-pack-8.0', 'pkgver': '8.0.33-0ubuntu1~24.04.1'},
    {'osver': '24.04', 'pkgname': 'dotnet-templates-10.0', 'pkgver': '10.0.114-0ubuntu1~24.04.1'},
    {'osver': '24.04', 'pkgname': 'dotnet-templates-8.0', 'pkgver': '8.0.133-0ubuntu1~24.04.1'},
    {'osver': '24.04', 'pkgname': 'dotnet10', 'pkgver': '10.0.114-10.0.14-0ubuntu1~24.04.1'},
    {'osver': '24.04', 'pkgname': 'dotnet8', 'pkgver': '8.0.133-8.0.33-0ubuntu1~24.04.1'},
    {'osver': '24.04', 'pkgname': 'netstandard-targeting-pack-2.1-8.0', 'pkgver': '8.0.133-0ubuntu1~24.04.1'},
    {'osver': '26.04', 'pkgname': 'aspnetcore-runtime-10.0', 'pkgver': '10.0.14-0ubuntu1~26.04.1'},
    {'osver': '26.04', 'pkgname': 'aspnetcore-runtime-dbg-10.0', 'pkgver': '10.0.14-0ubuntu1~26.04.1'},
    {'osver': '26.04', 'pkgname': 'aspnetcore-targeting-pack-10.0', 'pkgver': '10.0.14-0ubuntu1~26.04.1'},
    {'osver': '26.04', 'pkgname': 'dotnet-apphost-pack-10.0', 'pkgver': '10.0.14-0ubuntu1~26.04.1'},
    {'osver': '26.04', 'pkgname': 'dotnet-host-10.0', 'pkgver': '10.0.14-0ubuntu1~26.04.1'},
    {'osver': '26.04', 'pkgname': 'dotnet-hostfxr-10.0', 'pkgver': '10.0.14-0ubuntu1~26.04.1'},
    {'osver': '26.04', 'pkgname': 'dotnet-runtime-10.0', 'pkgver': '10.0.14-0ubuntu1~26.04.1'},
    {'osver': '26.04', 'pkgname': 'dotnet-runtime-dbg-10.0', 'pkgver': '10.0.14-0ubuntu1~26.04.1'},
    {'osver': '26.04', 'pkgname': 'dotnet-sdk-10.0', 'pkgver': '10.0.114-0ubuntu1~26.04.1'},
    {'osver': '26.04', 'pkgname': 'dotnet-sdk-10.0-source-built-artifacts', 'pkgver': '10.0.114-0ubuntu1~26.04.1'},
    {'osver': '26.04', 'pkgname': 'dotnet-sdk-aot-10.0', 'pkgver': '10.0.114-0ubuntu1~26.04.1'},
    {'osver': '26.04', 'pkgname': 'dotnet-sdk-dbg-10.0', 'pkgver': '10.0.114-0ubuntu1~26.04.1'},
    {'osver': '26.04', 'pkgname': 'dotnet-targeting-pack-10.0', 'pkgver': '10.0.14-0ubuntu1~26.04.1'},
    {'osver': '26.04', 'pkgname': 'dotnet-templates-10.0', 'pkgver': '10.0.114-0ubuntu1~26.04.1'},
    {'osver': '26.04', 'pkgname': 'dotnet10', 'pkgver': '10.0.114-10.0.14-0ubuntu1~26.04.1'},
    {'osver': '26.10', 'pkgname': 'aspnetcore-runtime-10.0', 'pkgver': '10.0.14-0ubuntu1~26.10.1'},
    {'osver': '26.10', 'pkgname': 'aspnetcore-runtime-11.0', 'pkgver': '11.0.0~rc3-0ubuntu1~26.10.1'},
    {'osver': '26.10', 'pkgname': 'aspnetcore-runtime-dbg-10.0', 'pkgver': '10.0.14-0ubuntu1~26.10.1'},
    {'osver': '26.10', 'pkgname': 'aspnetcore-runtime-dbg-11.0', 'pkgver': '11.0.0~rc3-0ubuntu1~26.10.1'},
    {'osver': '26.10', 'pkgname': 'aspnetcore-targeting-pack-10.0', 'pkgver': '10.0.14-0ubuntu1~26.10.1'},
    {'osver': '26.10', 'pkgname': 'aspnetcore-targeting-pack-11.0', 'pkgver': '11.0.0~rc3-0ubuntu1~26.10.1'},
    {'osver': '26.10', 'pkgname': 'dotnet-apphost-pack-10.0', 'pkgver': '10.0.14-0ubuntu1~26.10.1'},
    {'osver': '26.10', 'pkgname': 'dotnet-apphost-pack-11.0', 'pkgver': '11.0.0~rc3-0ubuntu1~26.10.1'},
    {'osver': '26.10', 'pkgname': 'dotnet-host-10.0', 'pkgver': '10.0.14-0ubuntu1~26.10.1'},
    {'osver': '26.10', 'pkgname': 'dotnet-host-11.0', 'pkgver': '11.0.0~rc3-0ubuntu1~26.10.1'},
    {'osver': '26.10', 'pkgname': 'dotnet-hostfxr-10.0', 'pkgver': '10.0.14-0ubuntu1~26.10.1'},
    {'osver': '26.10', 'pkgname': 'dotnet-hostfxr-11.0', 'pkgver': '11.0.0~rc3-0ubuntu1~26.10.1'},
    {'osver': '26.10', 'pkgname': 'dotnet-runtime-10.0', 'pkgver': '10.0.14-0ubuntu1~26.10.1'},
    {'osver': '26.10', 'pkgname': 'dotnet-runtime-11.0', 'pkgver': '11.0.0~rc3-0ubuntu1~26.10.1'},
    {'osver': '26.10', 'pkgname': 'dotnet-runtime-dbg-10.0', 'pkgver': '10.0.14-0ubuntu1~26.10.1'},
    {'osver': '26.10', 'pkgname': 'dotnet-runtime-dbg-11.0', 'pkgver': '11.0.0~rc3-0ubuntu1~26.10.1'},
    {'osver': '26.10', 'pkgname': 'dotnet-sdk-10.0', 'pkgver': '10.0.114-0ubuntu1~26.10.1'},
    {'osver': '26.10', 'pkgname': 'dotnet-sdk-10.0-source-built-artifacts', 'pkgver': '10.0.114-0ubuntu1~26.10.1'},
    {'osver': '26.10', 'pkgname': 'dotnet-sdk-11.0', 'pkgver': '11.0.100~rc3-0ubuntu1~26.10.1'},
    {'osver': '26.10', 'pkgname': 'dotnet-sdk-11.0-source-built-artifacts', 'pkgver': '11.0.100~rc3-0ubuntu1~26.10.1'},
    {'osver': '26.10', 'pkgname': 'dotnet-sdk-aot-10.0', 'pkgver': '10.0.114-0ubuntu1~26.10.1'},
    {'osver': '26.10', 'pkgname': 'dotnet-sdk-aot-11.0', 'pkgver': '11.0.100~rc3-0ubuntu1~26.10.1'},
    {'osver': '26.10', 'pkgname': 'dotnet-sdk-dbg-10.0', 'pkgver': '10.0.114-0ubuntu1~26.10.1'},
    {'osver': '26.10', 'pkgname': 'dotnet-sdk-dbg-11.0', 'pkgver': '11.0.100~rc3-0ubuntu1~26.10.1'},
    {'osver': '26.10', 'pkgname': 'dotnet-targeting-pack-10.0', 'pkgver': '10.0.14-0ubuntu1~26.10.1'},
    {'osver': '26.10', 'pkgname': 'dotnet-targeting-pack-11.0', 'pkgver': '11.0.0~rc3-0ubuntu1~26.10.1'},
    {'osver': '26.10', 'pkgname': 'dotnet-templates-10.0', 'pkgver': '10.0.114-0ubuntu1~26.10.1'},
    {'osver': '26.10', 'pkgname': 'dotnet-templates-11.0', 'pkgver': '11.0.100~rc3-0ubuntu1~26.10.1'},
    {'osver': '26.10', 'pkgname': 'dotnet10', 'pkgver': '10.0.114-10.0.14-0ubuntu1~26.10.1'},
    {'osver': '26.10', 'pkgname': 'dotnet11', 'pkgver': '11.0.100-11.0.0~rc3-0ubuntu1~26.10.1'}
];

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-11.0 / etc');
}