Linux Distros Unpatched Vulnerability : CVE-2021-4231

##
# (C) Tenable, Inc.
##

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  script_version("1.5");
  script_set_attribute(attribute:"plugin_modification_date", value:"2025/10/13");

  script_cve_id("CVE-2021-4231");

  script_name(english:"Linux Distros Unpatched Vulnerability : CVE-2021-4231");

  script_set_attribute(attribute:"synopsis", value:
"The Linux/Unix host has one or more packages installed with a vulnerability that the vendor indicates will not be
patched.");
  script_set_attribute(attribute:"description", value:
"The Linux/Unix host has one or more packages installed that are impacted by a vulnerability without a vendor supplied
patch available.

  - A vulnerability was found in Angular up to 11.0.4/11.1.0-next.2. It has been classified as problematic.
    Affected is the handling of comments. The manipulation leads to cross site scripting. It is possible to
    launch the attack remotely but it might require an authentication first. Upgrading to version 11.0.5 and
    11.1.0-next.3 is able to address this issue. The name of the patch is
    ba8da742e3b243e8f43d4c63aa842b44e14f2b09. It is recommended to upgrade the affected component.
    (CVE-2021-4231)

Note that Nessus relies on the presence of the package as reported by the vendor.");
  script_set_attribute(attribute:"see_also", value:"https://access.redhat.com/security/cve/cve-2021-4231");
  script_set_attribute(attribute:"solution", value:
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  script_set_attribute(attribute:"agent", value:"unix");
  script_set_cvss_base_vector("CVSS2#AV:N/AC:M/Au:S/C:N/I:P/A:N");
  script_set_cvss_temporal_vector("CVSS2#E:U/RL:U/RC:C");
  script_set_cvss3_base_vector("CVSS:3.0/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N");
  script_set_cvss3_temporal_vector("CVSS:3.0/E:U/RL:U/RC:C");
  script_set_attribute(attribute:"cvss_score_source", value:"CVE-2021-4231");

  script_set_attribute(attribute:"exploitability_ease", value:"No known exploits are available");
  script_set_attribute(attribute:"exploit_available", value:"false");
  script_set_attribute(attribute:"vendor_unpatched", value:"true");

  script_set_attribute(attribute:"vuln_publication_date", value:"2022/05/26");
  script_set_attribute(attribute:"plugin_publication_date", value:"2025/03/05");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:centos:centos:8");
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  script_copyright(english:"This script is Copyright (C) 2025 and is owned by Tenable, Inc. or an Affiliate thereof.");

  script_dependencies("set_linux_os_id.nasl", "ssh_get_info2.nasl");
  script_require_keys("Host/OS/identifier", "Host/cpu", "Host/local_checks_enabled", "global_settings/vendor_unpatched");
  script_require_ports("Host/OS/CentOS Linux-8", "Host/OS/Red Hat Enterprise Linux-8", "Host/OS/Red Hat Enterprise Linux-9");

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}

if (!get_kb_item("global_settings/vendor_unpatched")) exit(0, "Unpatched Vulnerabilities Detection not active.");
if (!get_kb_item("Host/local_checks_enabled")) audit(AUDIT_LOCAL_CHECKS_NOT_ENABLED);
if (empty_or_null(get_one_kb_item("Host/CentOS/rpm-list")) && empty_or_null(get_one_kb_item("Host/RedHat/rpm-list"))) audit(AUDIT_PACKAGE_LIST_MISSING);

include('linux_unpatched.inc');

var distro_constraints_array = {
  "CentOS Linux-8": {
    "package_manager": "rpm-list",
    "constraints": [
      {
        "release": "8",
        "pkgs": [
          {"reference": "aspnetcore-runtime-3.1"},
          {"reference": "aspnetcore-targeting-pack-3.1"},
          {"reference": "dotnet"},
          {"reference": "dotnet-apphost-pack-3.1"},
          {"reference": "dotnet-host"},
          {"reference": "dotnet-hostfxr-3.1"},
          {"reference": "dotnet-runtime-3.1"},
          {"reference": "dotnet-sdk-3.1"},
          {"reference": "dotnet-sdk-3.1-source-built-artifacts"},
          {"reference": "dotnet-targeting-pack-3.1"},
          {"reference": "dotnet-templates-3.1"},
          {"reference": "dotnet3.1"},
          {"reference": "firefox"},
          {"reference": "mozjs60"},
          {"reference": "mozjs60-devel"},
          {"reference": "netstandard-targeting-pack-2.1"},
          {"reference": "thunderbird"}
        ]
      }
    ]
  },
  "Red Hat Enterprise Linux-8": {
    "package_manager": "rpm-list",
    "constraints": [
      {
        "release": "8",
        "pkgs": [
          {"reference": "aspnetcore-runtime-3.1"},
          {"reference": "aspnetcore-targeting-pack-3.1"},
          {"reference": "dotnet"},
          {"reference": "dotnet-apphost-pack-3.1"},
          {"reference": "dotnet-host"},
          {"reference": "dotnet-hostfxr-3.1"},
          {"reference": "dotnet-runtime-3.1"},
          {"reference": "dotnet-sdk-3.1"},
          {"reference": "dotnet-sdk-3.1-source-built-artifacts"},
          {"reference": "dotnet-targeting-pack-3.1"},
          {"reference": "dotnet-templates-3.1"},
          {"reference": "dotnet3.1"},
          {"reference": "firefox"},
          {"reference": "mozjs60"},
          {"reference": "mozjs60-devel"},
          {"reference": "netstandard-targeting-pack-2.1"},
          {"reference": "thunderbird"}
        ]
      }
    ]
  },
  "Red Hat Enterprise Linux-9": {
    "package_manager": "rpm-list",
    "constraints": [
      {
        "release": "9",
        "pkgs": [
          {"reference": "firefox"},
          {"reference": "firefox-x11"},
          {"reference": "gjs"},
          {"reference": "gjs-devel"},
          {"reference": "thunderbird"}
        ]
      }
    ]
  }
};

var distro_constraints_values = linux_unpatched::get_distro_constraints(distro_constraints_arr:distro_constraints_array);
if (empty_or_null(distro_constraints_values)) audit(AUDIT_HOST_NOT, 'affected');
var report = linux_unpatched::check_unpatched_constraints(distro_constraints_values:distro_constraints_values);

if (!empty_or_null(report))
{
  security_report_v4(
      port       : 0,
      severity   : SECURITY_NOTE,
      extra      : report
  );
  exit(0);
}
else
{
  audit(AUDIT_HOST_NOT, 'affected');
}