Linux Distros Unpatched Vulnerability : CVE-2023-26604

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

include('compat.inc');

if (description)
{
  script_id(252082);
  script_version("1.1");
  script_set_attribute(attribute:"plugin_modification_date", value:"2025/08/19");

  script_cve_id("CVE-2023-26604");

  script_name(english:"Linux Distros Unpatched Vulnerability : CVE-2023-26604");

  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.

  - systemd before 247 does not adequately block local privilege escalation for some Sudo configurations,
    e.g., plausible sudoers files in which the systemctl status command may be executed. Specifically,
    systemd does not set LESSSECURE to 1, and thus other programs may be launched from the less program. This
    presents a substantial security risk when running systemctl from Sudo, because less executes as root when
    the terminal size is too small to show the complete systemctl output. (CVE-2023-26604)

Note that Nessus relies on the presence of the package as reported by the vendor.");
  script_set_attribute(attribute:"see_also", value:"https://ubuntu.com/security/CVE-2023-26604");
  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:L/AC:L/Au:N/C:C/I:C/A:C");
  script_set_cvss_temporal_vector("CVSS2#E:POC/RL:OF/RC:C");
  script_set_cvss3_base_vector("CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H");
  script_set_cvss3_temporal_vector("CVSS:3.0/E:P/RL:O/RC:C");
  script_set_attribute(attribute:"cvss_score_source", value:"CVE-2023-26604");

  script_set_attribute(attribute:"exploitability_ease", value:"Exploits are available");
  script_set_attribute(attribute:"exploit_available", value:"true");
  script_set_attribute(attribute:"vendor_unpatched", value:"true");

  script_set_attribute(attribute:"vuln_publication_date", value:"2023/03/03");
  script_set_attribute(attribute:"plugin_publication_date", value:"2025/08/19");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:canonical:ubuntu_linux:14.04:-:lts");
  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:18.04:-:lts");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:canonical:ubuntu_linux:20.04:-:lts");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:systemd");
  script_set_attribute(attribute:"generated_plugin", value:"current");
  script_end_attributes();

  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("ssh_get_info2.nasl", "set_linux_os_id.nasl");
  script_require_keys("Host/cpu", "Host/local_checks_enabled", "global_settings/vendor_unpatched", "Host/OS/identifier");
  script_require_ports("Host/OS/Ubuntu Linux-14.04", "Host/OS/Ubuntu Linux-16.04", "Host/OS/Ubuntu Linux-18.04", "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/Debian/dpkg-l"))) audit(AUDIT_PACKAGE_LIST_MISSING);

include('linux_unpatched.inc');

var distro_constraints_array = {
  "Ubuntu Linux-14.04": {
    "package_manager": "dpkg-l",
    "constraints": [
      {
        "release": "14.04",
        "pkgs": [
          {"reference": "gir1.2-gudev-1.0"},
          {"reference": "libgudev-1.0-0"},
          {"reference": "libgudev-1.0-dev"},
          {"reference": "libpam-systemd"},
          {"reference": "libsystemd-daemon-dev"},
          {"reference": "libsystemd-daemon0"},
          {"reference": "libsystemd-id128-0"},
          {"reference": "libsystemd-id128-dev"},
          {"reference": "libsystemd-journal-dev"},
          {"reference": "libsystemd-journal0"},
          {"reference": "libsystemd-login-dev"},
          {"reference": "libsystemd-login0"},
          {"reference": "libudev-dev"},
          {"reference": "libudev1"},
          {"reference": "libudev1-udeb"},
          {"reference": "python-systemd"},
          {"reference": "systemd"},
          {"reference": "systemd-services"},
          {"reference": "systemd-sysv"},
          {"reference": "udev"},
          {"reference": "udev-udeb"}
        ]
      }
    ]
  },
  "Ubuntu Linux-16.04": {
    "package_manager": "dpkg-l",
    "constraints": [
      {
        "release": "16.04",
        "pkgs": [
          {"reference": "libnss-myhostname"},
          {"reference": "libnss-mymachines"},
          {"reference": "libnss-resolve"},
          {"reference": "libpam-systemd"},
          {"reference": "libsystemd-dev"},
          {"reference": "libsystemd0"},
          {"reference": "libudev-dev"},
          {"reference": "libudev1"},
          {"reference": "libudev1-udeb"},
          {"reference": "systemd"},
          {"reference": "systemd-container"},
          {"reference": "systemd-coredump"},
          {"reference": "systemd-dbg"},
          {"reference": "systemd-journal-remote"},
          {"reference": "systemd-sysv"},
          {"reference": "udev"},
          {"reference": "udev-udeb"}
        ]
      }
    ]
  },
  "Ubuntu Linux-18.04": {
    "package_manager": "dpkg-l",
    "constraints": [
      {
        "release": "18.04",
        "pkgs": [
          {"reference": "libnss-myhostname"},
          {"reference": "libnss-mymachines"},
          {"reference": "libnss-resolve"},
          {"reference": "libnss-systemd"},
          {"reference": "libpam-systemd"},
          {"reference": "libsystemd-dev"},
          {"reference": "libsystemd0"},
          {"reference": "libudev-dev"},
          {"reference": "libudev1"},
          {"reference": "libudev1-udeb"},
          {"reference": "systemd"},
          {"reference": "systemd-container"},
          {"reference": "systemd-coredump"},
          {"reference": "systemd-journal-remote"},
          {"reference": "systemd-sysv"},
          {"reference": "systemd-tests"},
          {"reference": "udev"},
          {"reference": "udev-udeb"}
        ]
      }
    ]
  },
  "Ubuntu Linux-20.04": {
    "package_manager": "dpkg-l",
    "constraints": [
      {
        "release": "20.04",
        "pkgs": [
          {"reference": "libnss-myhostname"},
          {"reference": "libnss-mymachines"},
          {"reference": "libnss-resolve"},
          {"reference": "libnss-systemd"},
          {"reference": "libpam-systemd"},
          {"reference": "libsystemd-dev"},
          {"reference": "libsystemd0"},
          {"reference": "libudev-dev"},
          {"reference": "libudev1"},
          {"reference": "libudev1-udeb"},
          {"reference": "systemd"},
          {"reference": "systemd-container"},
          {"reference": "systemd-coredump"},
          {"reference": "systemd-journal-remote"},
          {"reference": "systemd-sysv"},
          {"reference": "systemd-tests"},
          {"reference": "systemd-timesyncd"},
          {"reference": "udev"},
          {"reference": "udev-udeb"}
        ]
      }
    ]
  }
};

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');
}