TencentOS Server 3: .NET 8.0 (TSSA-2026:0770)

#%NASL_MIN_LEVEL 80900
##
# (C) Tenable, Inc.
#
# The descriptive text and package checks in this plugin were
# extracted from Tencent Linux Security Advisory TSSA-2026:0770.
##

include('compat.inc');

if (description)
{
  script_id(330254);
  script_version("1.1");
  script_set_attribute(attribute:"plugin_modification_date", value:"2026/07/28");

  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"
  );

  script_name(english:"TencentOS Server 3: .NET 8.0 (TSSA-2026:0770)");

  script_set_attribute(attribute:"synopsis", value:
"The remote TencentOS Server 3 host is missing one or more security updates.");
  script_set_attribute(attribute:"description", value:
"The version of Tencent Linux installed on the remote TencentOS Server 3 host is prior to tested version. It is,
therefore, affected by multiple vulnerabilities as referenced in the TSSA-2026:0770 advisory.

    Package updates are available for TencentOS Server 3 that fix the following vulnerabilities:

    CVE-2026-47300:
    Incorrect implementation of authentication algorithm in ASP.NET Core allows an authorized attacker to
    elevate privileges over a network.

    CVE-2026-47302:
    Allocation of resources without limits or throttling in .NET allows an unauthorized attacker to deny
    service over a network.

    CVE-2026-47303:
    Authentication bypass by assumed-immutable data in ASP.NET Core allows an authorized attacker to elevate
    privileges over a network.

    CVE-2026-47304:
    Improper verification of cryptographic signature in .NET allows an unauthorized attacker to bypass a
    security feature over a network.

    CVE-2026-50524:
    Improper validation of specified type of input in .NET Framework allows an unauthorized attacker to deny
    service over a network.

    CVE-2026-50525:
    Allocation of resources without limits or throttling in .NET allows an unauthorized attacker to deny
    service over a network.

    CVE-2026-50526:
    Improper link resolution before file access ('link following') in .NET allows an authorized attacker to
    perform tampering locally.

    CVE-2026-50527:
    Stack-based buffer overflow in .NET Framework allows an unauthorized attacker to deny service over a
    network.

    CVE-2026-50528:
    Incorrect authorization in .NET allows an unauthorized attacker to bypass a security feature over a
    network.

    CVE-2026-50646:
    Protection mechanism failure in .NET Framework allows an unauthorized attacker to execute code locally.

    CVE-2026-50648:
    Allocation of resources without limits or throttling in .NET Framework allows an unauthorized attacker to
    deny service over a network.

    CVE-2026-50649:
    Deserialization of untrusted data in .NET allows an unauthorized attacker to execute code locally.

    CVE-2026-50650:
    Improper control of generation of code ('code injection') in .NET Framework allows an unauthorized
    attacker to elevate privileges locally.

    CVE-2026-50651:
    Allocation of resources without limits or throttling in .NET allows an unauthorized attacker to deny
    service over a network.

    CVE-2026-50659:
    Improper encoding or escaping of output in .NET allows an authorized attacker to perform spoofing over a
    network.

    CVE-2026-56170:
    Allocation of resources without limits or throttling in ASP.NET Core allows an unauthorized attacker to
    deny service over a network.

    CVE-2026-57108:
    Access of resource using incompatible type ('type confusion') in .NET Core allows an unauthorized attacker
    to deny service over a network.

Tenable has extracted the preceding description block directly from the Tencent 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://mirrors.tencent.com/tlinux/errata/tssa-20260770.xml");
  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_set_attribute(attribute:"vuln_publication_date", value:"2026/07/14");
  script_set_attribute(attribute:"patch_publication_date", value:"2026/07/20");
  script_set_attribute(attribute:"plugin_publication_date", value:"2026/07/28");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:tencent:tencentos_server:3");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:tencent:tencentos_server:dotnet8.0");
  script_set_attribute(attribute:"generated_plugin", value:"current");
  script_end_attributes();

  script_category(ACT_GATHER_INFO);
  script_family(english:"Tencent 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_info2.nasl");
  script_require_keys("Host/local_checks_enabled", "Host/etc/os-release", "Host/TencentOS/rpm-list", "Host/cpu");

  exit(0);
}


include('rpm2.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) || 'TencentOS' >!< os_product) audit(AUDIT_OS_NOT, 'TencentOS');
var os_version = get_kb_item('installed_os/local/SSH/0/version');
if (isnull(os_version)) audit(AUDIT_UNKNOWN_APP_VER, 'TencentOS');
if (! preg(pattern:"^3([^0-9]|$)", string:os_version)) audit(AUDIT_OS_NOT, 'TencentOS 3.x', 'TencentOS ' + os_version);

if (!get_kb_item('Host/TencentOS/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) audit(AUDIT_LOCAL_CHECKS_NOT_IMPLEMENTED, 'TencentOS', cpu);

var constraints = [
  {
    'release': '3',
    'pkgs': [
      {'reference':'aspnetcore-runtime-8.0-8.0.29-1.tl3', 'cpu':'aarch64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'aspnetcore-runtime-8.0-8.0.29-1.tl3', 'cpu':'x86_64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'aspnetcore-runtime-dbg-8.0-8.0.29-1.tl3', 'cpu':'aarch64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'aspnetcore-runtime-dbg-8.0-8.0.29-1.tl3', 'cpu':'x86_64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'aspnetcore-targeting-pack-8.0-8.0.29-1.tl3', 'cpu':'aarch64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'aspnetcore-targeting-pack-8.0-8.0.29-1.tl3', 'cpu':'x86_64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'dotnet-apphost-pack-8.0-8.0.29-1.tl3', 'cpu':'aarch64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'dotnet-apphost-pack-8.0-8.0.29-1.tl3', 'cpu':'x86_64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'dotnet-apphost-pack-8.0-debuginfo-8.0.29-1.tl3', 'cpu':'aarch64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'dotnet-apphost-pack-8.0-debuginfo-8.0.29-1.tl3', 'cpu':'x86_64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'dotnet-hostfxr-8.0-8.0.29-1.tl3', 'cpu':'aarch64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'dotnet-hostfxr-8.0-8.0.29-1.tl3', 'cpu':'x86_64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'dotnet-hostfxr-8.0-debuginfo-8.0.29-1.tl3', 'cpu':'aarch64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'dotnet-hostfxr-8.0-debuginfo-8.0.29-1.tl3', 'cpu':'x86_64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'dotnet-runtime-8.0-8.0.29-1.tl3', 'cpu':'aarch64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'dotnet-runtime-8.0-8.0.29-1.tl3', 'cpu':'x86_64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'dotnet-runtime-8.0-debuginfo-8.0.29-1.tl3', 'cpu':'aarch64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'dotnet-runtime-8.0-debuginfo-8.0.29-1.tl3', 'cpu':'x86_64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'dotnet-runtime-dbg-8.0-8.0.29-1.tl3', 'cpu':'aarch64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'dotnet-runtime-dbg-8.0-8.0.29-1.tl3', 'cpu':'x86_64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'dotnet-sdk-8.0-8.0.129-1.tl3', 'cpu':'aarch64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'dotnet-sdk-8.0-8.0.129-1.tl3', 'cpu':'x86_64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'dotnet-sdk-8.0-debuginfo-8.0.129-1.tl3', 'cpu':'aarch64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'dotnet-sdk-8.0-debuginfo-8.0.129-1.tl3', 'cpu':'x86_64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'dotnet-sdk-8.0-source-built-artifacts-8.0.129-1.tl3', 'cpu':'aarch64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'dotnet-sdk-8.0-source-built-artifacts-8.0.129-1.tl3', 'cpu':'x86_64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'dotnet-sdk-dbg-8.0-8.0.129-1.tl3', 'cpu':'aarch64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'dotnet-sdk-dbg-8.0-8.0.129-1.tl3', 'cpu':'x86_64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'dotnet-targeting-pack-8.0-8.0.29-1.tl3', 'cpu':'aarch64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'dotnet-targeting-pack-8.0-8.0.29-1.tl3', 'cpu':'x86_64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'dotnet-templates-8.0-8.0.129-1.tl3', 'cpu':'aarch64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'dotnet-templates-8.0-8.0.129-1.tl3', 'cpu':'x86_64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'dotnet8.0-debuginfo-8.0.129-1.tl3', 'cpu':'aarch64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'dotnet8.0-debuginfo-8.0.129-1.tl3', 'cpu':'x86_64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'dotnet8.0-debugsource-8.0.129-1.tl3', 'cpu':'aarch64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'dotnet8.0-debugsource-8.0.129-1.tl3', 'cpu':'x86_64', 'rpm_spec_vers_cmp':TRUE}
    ]
  }
];

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 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;
  }
  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 &&
        ## (no known rpm to check OR known rpm_exists)
        (!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)
{
  security_report_v4(
      port       : 0,
      severity   : SECURITY_HOLE,
      extra      : rpm_report_get()
  );
  exit(0);
}
else
{
  var tested = pkg_tests_get();
  if (tested) audit(AUDIT_PACKAGE_NOT_AFFECTED, tested);
  else audit(AUDIT_PACKAGE_NOT_INSTALLED, 'aspnetcore-runtime-8.0 / aspnetcore-runtime-dbg-8.0 / aspnetcore-targeting-pack-8.0 / etc');
}