RHEL 9 : .NET 9.0 (RHSA-2026:58570)

#%NASL_MIN_LEVEL 80900
##
# (C) Tenable, Inc.
#
# The descriptive text and package checks in this plugin were
# extracted from Red Hat Security Advisory RHSA-2026:58570. The text
# itself is copyright (C) Red Hat, Inc.
##

include('compat.inc');

if (description)
{
  script_id(339084);
  script_version("1.1");
  script_set_attribute(attribute:"plugin_modification_date", value:"2026/08/24");

  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-2026-50646",
    "CVE-2026-50648",
    "CVE-2026-50649",
    "CVE-2026-50650",
    "CVE-2026-50651",
    "CVE-2026-50659",
    "CVE-2026-56170",
    "CVE-2026-57108",
    "CVE-2026-62899",
    "CVE-2026-62900",
    "CVE-2026-62901",
    "CVE-2026-62909"
  );
  script_xref(name:"RHSA", value:"2026:58570");

  script_name(english:"RHEL 9 : .NET 9.0 (RHSA-2026:58570)");

  script_set_attribute(attribute:"synopsis", value:
"The remote Red Hat host is missing one or more security updates.");
  script_set_attribute(attribute:"description", value:
"The remote Redhat Enterprise Linux 9 host has packages installed that are affected by multiple vulnerabilities as
referenced in the RHSA-2026:58570 advisory.

    .NET is a fast, lightweight and modular platform for creating cross platform applications that work on
    Linux, macOS and Windows.  It particularly focuses on creating console applications, web applications and
    micro-services.  .NET contains a runtime conforming to .NET Standards a set of framework libraries, an SDK
    containing compilers and a 'dotnet' application to drive everything.

    SDK version: 9.0.120
    Runtime version: 9.0.19

    Security Fix(es):

    * dotnet: SocketsHttpHandler Http2Connection - HTTP/2 SETTINGS/PING ACK flood causing OOM (CVE-2026-50651)

    * dotnet: .NET Core: Denial of Service via type confusion (CVE-2026-57108)

    * ASP.NET Core: ASP.NET Core: Denial of Service via uncontrolled resource allocation (CVE-2026-56170)

    * ASP.NET Core: ASP.NET Core: Privilege Escalation via Incorrect Authentication Algorithm (CVE-2026-47300)

    * ASP.NET Core: ASP.NET Core: Privilege Elevation via Authentication Bypass (CVE-2026-47303)

    * dotnet: .NET Security Feature Bypass Vulnerability (CVE-2026-47304)

    * dotnet: .NET: Denial of Service vulnerability due to uncontrolled resource allocation (CVE-2026-47302)

    * dotnet: .NET Framework: Privilege escalation via code injection (CVE-2026-50650)

    * dotnet: .NET: Security feature bypass due to incorrect authorization (CVE-2026-50528)

    * dotnet: .NET: Local code execution via deserialization of untrusted data (CVE-2026-50649)

    * dotnet: .NET: Local tampering via improper link resolution (CVE-2026-50526)

    * dotnet: .NET Framework: Local Code Execution via Protection Mechanism Failure (CVE-2026-50646)

    * dotnet: .NET: Denial of Service due to uncontrolled resource allocation (CVE-2026-50525)

    * dotnet: .NET Framework: Denial of Service via network-based buffer overflow (CVE-2026-50527)

    * dotnet: .NET Framework: Remote Denial of Service due to uncontrolled resource allocation
    (CVE-2026-50648)

    * .NET: .NET: Network Spoofing Vulnerability (CVE-2026-50659)

    * dotnet: .NET Framework: Denial of Service via improper input validation (CVE-2026-50524)

    * .NET: .NET Core: .NET Security Feature Bypass Vulnerability (CVE-2026-62899)

    * .NET: .NET Information Disclosure Vulnerability (CVE-2026-62900)

    * .NET: .NET Denial of Service Vulnerability (CVE-2026-62901)

    * .NET: .NET Elevation of Privilege Vulnerability (CVE-2026-62909)

    Bug Fix(es) and Enhancement(s):

    * dotnet9.0: Reduce time to detect hanging builds during .NET RPM builds (c9s) [rhel-9.6.z]
    (JIRA:RHEL-192335)

    For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and
    other related information, refer to the CVE page(s) listed in the References section.

Tenable has extracted the preceding description block directly from the Red Hat Enterprise Linux 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://access.redhat.com/security/updates/classification/#important");
  script_set_attribute(attribute:"see_also", value:"https://bugzilla.redhat.com/show_bug.cgi?id=2499217");
  script_set_attribute(attribute:"see_also", value:"https://bugzilla.redhat.com/show_bug.cgi?id=2500109");
  script_set_attribute(attribute:"see_also", value:"https://bugzilla.redhat.com/show_bug.cgi?id=2500189");
  script_set_attribute(attribute:"see_also", value:"https://bugzilla.redhat.com/show_bug.cgi?id=2500492");
  script_set_attribute(attribute:"see_also", value:"https://bugzilla.redhat.com/show_bug.cgi?id=2500502");
  script_set_attribute(attribute:"see_also", value:"https://bugzilla.redhat.com/show_bug.cgi?id=2500509");
  script_set_attribute(attribute:"see_also", value:"https://bugzilla.redhat.com/show_bug.cgi?id=2500515");
  script_set_attribute(attribute:"see_also", value:"https://bugzilla.redhat.com/show_bug.cgi?id=2500556");
  script_set_attribute(attribute:"see_also", value:"https://bugzilla.redhat.com/show_bug.cgi?id=2500562");
  script_set_attribute(attribute:"see_also", value:"https://bugzilla.redhat.com/show_bug.cgi?id=2500563");
  script_set_attribute(attribute:"see_also", value:"https://bugzilla.redhat.com/show_bug.cgi?id=2500565");
  script_set_attribute(attribute:"see_also", value:"https://bugzilla.redhat.com/show_bug.cgi?id=2500577");
  script_set_attribute(attribute:"see_also", value:"https://bugzilla.redhat.com/show_bug.cgi?id=2500580");
  script_set_attribute(attribute:"see_also", value:"https://bugzilla.redhat.com/show_bug.cgi?id=2500581");
  script_set_attribute(attribute:"see_also", value:"https://bugzilla.redhat.com/show_bug.cgi?id=2500587");
  script_set_attribute(attribute:"see_also", value:"https://bugzilla.redhat.com/show_bug.cgi?id=2500589");
  script_set_attribute(attribute:"see_also", value:"https://bugzilla.redhat.com/show_bug.cgi?id=2500593");
  script_set_attribute(attribute:"see_also", value:"https://bugzilla.redhat.com/show_bug.cgi?id=2512175");
  script_set_attribute(attribute:"see_also", value:"https://bugzilla.redhat.com/show_bug.cgi?id=2512179");
  script_set_attribute(attribute:"see_also", value:"https://bugzilla.redhat.com/show_bug.cgi?id=2512180");
  script_set_attribute(attribute:"see_also", value:"https://bugzilla.redhat.com/show_bug.cgi?id=2512185");
  # https://security.access.redhat.com/data/csaf/v2/advisories/2026/rhsa-2026_58570.json
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?cf0a3a63");
  script_set_attribute(attribute:"see_also", value:"https://access.redhat.com/errata/RHSA-2026:58570");
  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:U/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:U/RL:O/RC:C");
  script_set_attribute(attribute:"cvss_score_source", value:"CVE-2026-47304");

  script_set_attribute(attribute:"exploitability_ease", value:"No known exploits are available");
  script_set_attribute(attribute:"exploit_available", value:"false");
  script_cwe_id(59, 94, 120, 212, 252, 303, 347, 444, 472, 502, 551, 606, 770, 807, 838, 843, 1287);
  script_set_attribute(attribute:"vendor_severity", value:"Important");

  script_set_attribute(attribute:"vuln_publication_date", value:"2026/07/14");
  script_set_attribute(attribute:"patch_publication_date", value:"2026/08/24");
  script_set_attribute(attribute:"plugin_publication_date", value:"2026/08/24");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:redhat:rhel_eus:9.6");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:aspnetcore-runtime-9.0");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:aspnetcore-runtime-dbg-9.0");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:aspnetcore-targeting-pack-9.0");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:dotnet-apphost-pack-9.0");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:dotnet-host");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:dotnet-hostfxr-9.0");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:dotnet-runtime-9.0");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:dotnet-runtime-dbg-9.0");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:dotnet-sdk-9.0");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:dotnet-sdk-9.0-source-built-artifacts");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:dotnet-sdk-aot-9.0");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:dotnet-sdk-dbg-9.0");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:dotnet-targeting-pack-9.0");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:dotnet-templates-9.0");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:dotnet9.0");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:netstandard-targeting-pack-2.1");
  script_set_attribute(attribute:"generated_plugin", value:"current");
  script_end_attributes();

  script_category(ACT_GATHER_INFO);
  script_family(english:"Red Hat Local Security Checks");

  script_copyright(english:"This script is Copyright (C) 2026 and is owned by Tenable, Inc. or an Affiliate thereof.");

  script_dependencies("ssh_get_info.nasl", "redhat_repos.nasl");
  script_require_keys("Host/local_checks_enabled", "Host/RedHat/release", "Host/RedHat/rpm-list", "Host/cpu");

  exit(0);
}


include('rpm2.inc');
include('rhel.inc');

if (!get_kb_item('Host/local_checks_enabled')) audit(AUDIT_LOCAL_CHECKS_NOT_ENABLED);
var os_product = get_kb_item('installed_os/local/SSH/0/product');
if (isnull(os_product) || 'Red Hat' >!< os_product) audit(AUDIT_OS_NOT, 'Red Hat');
var os_version = get_kb_item('installed_os/local/SSH/0/version');
if (isnull(os_version)) audit(AUDIT_UNKNOWN_APP_VER, 'Red Hat');
if (!rhel_check_release(operator: 'eq', os_version: os_version, rhel_version: '9.6')) audit(AUDIT_OS_NOT, 'Red Hat 9.6', 'Red Hat ' + os_version);

if (!get_kb_item('Host/RedHat/rpm-list')) 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 && 'ppc' >!< cpu) audit(AUDIT_LOCAL_CHECKS_NOT_IMPLEMENTED, 'Red Hat', cpu);

var constraints = [
  {
    'release': '9',
    'sp': '6',
    'repo_relative_urls': [
      'content/aus/rhel9/9.6/x86_64/appstream/debug',
      'content/aus/rhel9/9.6/x86_64/appstream/os',
      'content/aus/rhel9/9.6/x86_64/appstream/source/SRPMS',
      'content/e4s/rhel9/9.6/aarch64/appstream/debug',
      'content/e4s/rhel9/9.6/aarch64/appstream/os',
      'content/e4s/rhel9/9.6/aarch64/appstream/source/SRPMS',
      'content/e4s/rhel9/9.6/x86_64/appstream/debug',
      'content/e4s/rhel9/9.6/x86_64/appstream/os',
      'content/e4s/rhel9/9.6/x86_64/appstream/source/SRPMS',
      'content/e6s/rhel9/9.6/aarch64/appstream/debug',
      'content/e6s/rhel9/9.6/aarch64/appstream/os',
      'content/e6s/rhel9/9.6/aarch64/appstream/source/SRPMS',
      'content/e6s/rhel9/9.6/x86_64/appstream/debug',
      'content/e6s/rhel9/9.6/x86_64/appstream/os',
      'content/e6s/rhel9/9.6/x86_64/appstream/source/SRPMS',
      'content/eus/rhel9/9.6/aarch64/appstream/debug',
      'content/eus/rhel9/9.6/aarch64/appstream/os',
      'content/eus/rhel9/9.6/aarch64/appstream/source/SRPMS',
      'content/eus/rhel9/9.6/x86_64/appstream/debug',
      'content/eus/rhel9/9.6/x86_64/appstream/os',
      'content/eus/rhel9/9.6/x86_64/appstream/source/SRPMS'
    ],
    'pkgs': [
      {'reference':'aspnetcore-runtime-9.0-9.0.19-1.el9_6', 'sp':'6', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'aspnetcore-runtime-dbg-9.0-9.0.19-1.el9_6', 'sp':'6', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'aspnetcore-targeting-pack-9.0-9.0.19-1.el9_6', 'sp':'6', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'dotnet-apphost-pack-9.0-9.0.19-1.el9_6', 'sp':'6', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'dotnet-host-9.0.19-1.el9_6', 'sp':'6', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'dotnet-hostfxr-9.0-9.0.19-1.el9_6', 'sp':'6', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'dotnet-runtime-9.0-9.0.19-1.el9_6', 'sp':'6', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'dotnet-runtime-dbg-9.0-9.0.19-1.el9_6', 'sp':'6', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'dotnet-sdk-9.0-9.0.120-1.el9_6', 'sp':'6', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'dotnet-sdk-aot-9.0-9.0.120-1.el9_6', 'sp':'6', 'cpu':'aarch64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'dotnet-sdk-aot-9.0-9.0.120-1.el9_6', 'sp':'6', 'cpu':'x86_64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'dotnet-sdk-dbg-9.0-9.0.120-1.el9_6', 'sp':'6', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'dotnet-targeting-pack-9.0-9.0.19-1.el9_6', 'sp':'6', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'dotnet-templates-9.0-9.0.120-1.el9_6', 'sp':'6', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'netstandard-targeting-pack-2.1-9.0.120-1.el9_6', 'sp':'6', 'rpm_spec_vers_cmp':TRUE}
    ]
  },
  {
    'release': '9',
    'sp': '6',
    'repo_relative_urls': [
      'content/eus/rhel9/9.6/aarch64/codeready-builder/debug',
      'content/eus/rhel9/9.6/aarch64/codeready-builder/os',
      'content/eus/rhel9/9.6/aarch64/codeready-builder/source/SRPMS',
      'content/eus/rhel9/9.6/x86_64/codeready-builder/debug',
      'content/eus/rhel9/9.6/x86_64/codeready-builder/os',
      'content/eus/rhel9/9.6/x86_64/codeready-builder/source/SRPMS'
    ],
    'pkgs': [
      {'reference':'dotnet-sdk-9.0-source-built-artifacts-9.0.120-1.el9_6', 'sp':'6', 'rpm_spec_vers_cmp':TRUE}
    ]
  }
];

var applicable_repo_urls = rhel_determine_applicable_repository_urls(constraints:constraints);
if(applicable_repo_urls == RHEL_REPOS_NO_OVERLAP_MESSAGE) exit(0, RHEL_REPO_NOT_ENABLED);

var os_release = get_one_kb_item('installed_os/local/SSH/0/release');
var os_sp = get_one_kb_item('Host/*/minor_release');

var flag = 0;
var repo_relative_urls;
var reference;
var sp;
var _cpu;
var el_string;
var rpm_spec_vers_cmp;
var epoch;
var allowmaj;
var exists_check;
var cves;
foreach var constraint ( constraints ) {
  # Check that the target release is equal to the affected release
  if (!empty_or_null(constraint['release'])){
    if (constraint['release'] != os_release) continue;
  }
  if (!empty_or_null(constraint['sp'])){
    if (constraint['sp'] != os_sp) continue;
  }

  if (!empty_or_null(constraint['repo_relative_urls'])) repo_relative_urls = constraint['repo_relative_urls'];

  foreach var pkg ( constraint['pkgs'] ) {
    reference = NULL;
    sp = NULL;
    _cpu = NULL;
    el_string = NULL;
    rpm_spec_vers_cmp = NULL;
    epoch = NULL;
    allowmaj = NULL;
    exists_check = NULL;
    cves = NULL;
    if (!empty_or_null(pkg['reference'])) reference = pkg['reference'];
    if (!empty_or_null(pkg['sp'])) sp = pkg['sp'];
    if (!empty_or_null(pkg['cpu'])) _cpu = pkg['cpu'];
    if (!empty_or_null(pkg['el_string'])) el_string = pkg['el_string'];
    if (!empty_or_null(pkg['rpm_spec_vers_cmp'])) rpm_spec_vers_cmp = pkg['rpm_spec_vers_cmp'];
    if (!empty_or_null(pkg['epoch'])) epoch = pkg['epoch'];
    if (!empty_or_null(pkg['allowmaj'])) allowmaj = pkg['allowmaj'];
    if (!empty_or_null(pkg['exists_check'])) exists_check = pkg['exists_check'];
    if (!empty_or_null(pkg['cves'])) cves = pkg['cves'];
    if (reference &&
        rhel_decide_repo_relative_url_check(required_repo_url_list:repo_relative_urls) &&
        (applicable_repo_urls || (!exists_check || rpm_exists(rpm:exists_check))) &&
        rpm_check(sp:sp, cpu:_cpu, reference:reference, epoch:epoch, el_string:el_string, rpm_spec_vers_cmp:rpm_spec_vers_cmp, allowmaj:allowmaj, cves:cves)) flag++;
  }
}

if (flag)
{
  var subscription_caveat = '\n' +
    'NOTE: This vulnerability check contains fixes that apply to\n' +
    'packages only available in the Red Hat Enterprise Linux\n' +
    'Extended Update Support repository.\n' +
    'Access to this repository requires a paid RHEL subscription.\n';
  var extra = NULL;
  if (isnull(applicable_repo_urls) || !applicable_repo_urls) extra = subscription_caveat + rpm_report_get() + redhat_report_repo_caveat();
  else extra = subscription_caveat + rpm_report_get();
  security_report_v4(
      port       : 0,
      severity   : SECURITY_HOLE,
      extra      : extra
  );
  exit(0);
}
else
{
  var tested = pkg_tests_get();
  if (tested) audit(AUDIT_PACKAGE_NOT_AFFECTED, tested);
  else audit(AUDIT_PACKAGE_NOT_INSTALLED, 'aspnetcore-runtime-9.0 / aspnetcore-runtime-dbg-9.0 / etc');
}