Linux Distros Unpatched Vulnerability : CVE-2021-38561

#%NASL_MIN_LEVEL 80900
##
# (C) Tenable, Inc.
##

include('compat.inc');

if (description)
{
  script_id(224109);
  script_version("1.4");
  script_set_attribute(attribute:"plugin_modification_date", value:"2025/09/10");

  script_cve_id("CVE-2021-38561");

  script_name(english:"Linux Distros Unpatched Vulnerability : CVE-2021-38561");

  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.

  - golang.org/x/text/language in golang.org/x/text before 0.3.7 can panic with an out-of-bounds read during
    BCP 47 language tag parsing. Index calculation is mishandled. If parsing untrusted user input, this can be
    used as a vector for a denial-of-service attack. (CVE-2021-38561)

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-2021-38561");
  script_set_attribute(attribute:"see_also", value:"https://security-tracker.debian.org/tracker/CVE-2021-38561");
  script_set_attribute(attribute:"see_also", value:"https://ubuntu.com/security/CVE-2021-38561");
  script_set_attribute(attribute:"solution", value:
"There is no known solution at this time.");
  script_set_attribute(attribute:"agent", value:"unix");
  script_set_cvss_base_vector("CVSS2#AV:N/AC:M/Au:N/C:N/I:N/A:P");
  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-2021-38561");

  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:"2022/12/26");
  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:canonical:ubuntu_linux:16.04:-:lts");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:canonical:ubuntu_linux:20.04:-:lts");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:centos:centos:8");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:debian:debian_linux:11.0");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:redhat:enterprise_linux:8");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:redhat:enterprise_linux:9");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:golang-x-text");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:osbuild-composer");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:osbuild-composer-core");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:osbuild-composer-dnf-json");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:osbuild-composer-worker");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:podman");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:podman-catatonit");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:podman-docker");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:podman-gvproxy");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:podman-manpages");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:podman-plugins");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:podman-remote");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:podman-tests");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:golang-golang-x-text");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:osbuild-composer");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:osbuild-composer-core");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:osbuild-composer-dnf-json");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:osbuild-composer-worker");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:podman");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:podman-catatonit");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:podman-docker");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:podman-gvproxy");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:podman-manpages");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:podman-plugins");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:podman-remote");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:podman-tests");
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  script_category(ACT_GATHER_INFO);
  script_family(english:"Misc.");

  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/Debian Linux-11", "Host/OS/Red Hat Enterprise Linux-8", "Host/OS/Red Hat Enterprise Linux-9", "Host/OS/Ubuntu Linux-16.04", "Host/OS/Ubuntu Linux-20.04");

  exit(0);
}

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/Debian/dpkg-l")) && empty_or_null(get_one_kb_item("Host/RedHat/rpm-list"))) audit(AUDIT_PACKAGE_LIST_MISSING);

include('linux_unpatched.inc');

var distro_constraints_array = {
  "Debian Linux-11": {
    "package_manager": "dpkg-l",
    "constraints": [
      {
        "release": "11",
        "pkgs": [
          {"reference": "golang-golang-x-text-dev"}
        ]
      }
    ]
  },
  "Ubuntu Linux-16.04": {
    "package_manager": "dpkg-l",
    "constraints": [
      {
        "release": "16.04",
        "pkgs": [
          {"reference": "golang-x-text-dev"}
        ]
      }
    ]
  },
  "Ubuntu Linux-20.04": {
    "package_manager": "dpkg-l",
    "constraints": [
      {
        "release": "20.04",
        "pkgs": [
          {"reference": "golang-x-text"}
        ]
      }
    ]
  },
  "CentOS Linux-8": {
    "package_manager": "rpm-list",
    "constraints": [
      {
        "release": "8",
        "pkgs": [
          {"reference": "osbuild-composer"},
          {"reference": "osbuild-composer-core"},
          {"reference": "osbuild-composer-dnf-json"},
          {"reference": "osbuild-composer-worker"},
          {"reference": "podman"},
          {"reference": "podman-catatonit"},
          {"reference": "podman-docker"},
          {"reference": "podman-gvproxy"},
          {"reference": "podman-manpages"},
          {"reference": "podman-plugins"},
          {"reference": "podman-remote"},
          {"reference": "podman-tests"}
        ]
      }
    ]
  },
  "Red Hat Enterprise Linux-8": {
    "package_manager": "rpm-list",
    "constraints": [
      {
        "release": "8",
        "pkgs": [
          {"reference": "osbuild-composer"},
          {"reference": "osbuild-composer-core"},
          {"reference": "osbuild-composer-dnf-json"},
          {"reference": "osbuild-composer-worker"},
          {"reference": "podman"},
          {"reference": "podman-catatonit"},
          {"reference": "podman-docker"},
          {"reference": "podman-gvproxy"},
          {"reference": "podman-manpages"},
          {"reference": "podman-plugins"},
          {"reference": "podman-remote"},
          {"reference": "podman-tests"}
        ]
      }
    ]
  },
  "Red Hat Enterprise Linux-9": {
    "package_manager": "rpm-list",
    "constraints": [
      {
        "release": "9",
        "pkgs": [
          {"reference": "osbuild-composer"},
          {"reference": "osbuild-composer-core"},
          {"reference": "osbuild-composer-dnf-json"},
          {"reference": "osbuild-composer-worker"},
          {"reference": "podman"},
          {"reference": "podman-catatonit"},
          {"reference": "podman-docker"},
          {"reference": "podman-gvproxy"},
          {"reference": "podman-plugins"},
          {"reference": "podman-remote"},
          {"reference": "podman-tests"}
        ]
      }
    ]
  }
};

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_WARNING,
      extra      : report
  );
  exit(0);
}
else
{
  audit(AUDIT_HOST_NOT, 'affected');
}