Linux Distros Unpatched Vulnerability : CVE-2026-118176

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

include('compat.inc');

if (description)
{
  script_id(372753);
  script_version("1.1");
  script_set_attribute(attribute:"plugin_modification_date", value:"2026/10/28");

  script_cve_id("CVE-2026-118176");

  script_name(english:"Linux Distros Unpatched Vulnerability : CVE-2026-118176");

  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.

  - Thunderbird's check that prevents mailbox: URLs from accessing files on remote Windows network shares
    could be bypassed using extended-length UNC paths. Displaying a specially crafted email could cause
    Thunderbird to connect to an SMB server chosen by the attacker, disclosing the user's Windows account name
    and NTLM authentication data, which could be used for offline password cracking or relay attacks. This bug
    only affects Thunderbird on Windows. Other operating systems are unaffected. This vulnerability was fixed
    in Thunderbird 159 and Thunderbird 153.6. (CVE-2026-118176)

Note that Nessus relies on the presence of the package as reported by the vendor.");
  script_set_attribute(attribute:"see_also", value:"https://security-tracker.debian.org/tracker/CVE-2026-118176");
  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:L/Au:N/C:P/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:N/UI:N/S:U/C:H/I:H/A:H");
  script_set_cvss3_temporal_vector("CVSS:3.0/E:U/RL:U/RC:C");
  script_set_attribute(attribute:"cvss_score_source", value:"CVE-2026-118176");

  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:"2026/10/27");
  script_set_attribute(attribute:"plugin_publication_date", value:"2026/10/28");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:debian:debian_linux:12.0");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:debian:debian_linux:13.0");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:debian:debian_linux:14.0");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:thunderbird");
  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) 2026 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/Debian Linux-12", "Host/OS/Debian Linux-13", "Host/OS/Debian Linux-14");

  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 = {
  "Debian Linux-12": {
    "package_manager": "dpkg-l",
    "constraints": [
      {
        "release": "12",
        "pkgs": [
          {"reference": "thunderbird"},
          {"reference": "thunderbird-l10n-af"},
          {"reference": "thunderbird-l10n-all"},
          {"reference": "thunderbird-l10n-ar"},
          {"reference": "thunderbird-l10n-ast"},
          {"reference": "thunderbird-l10n-be"},
          {"reference": "thunderbird-l10n-bg"},
          {"reference": "thunderbird-l10n-br"},
          {"reference": "thunderbird-l10n-ca"},
          {"reference": "thunderbird-l10n-cak"},
          {"reference": "thunderbird-l10n-cs"},
          {"reference": "thunderbird-l10n-cy"},
          {"reference": "thunderbird-l10n-da"},
          {"reference": "thunderbird-l10n-de"},
          {"reference": "thunderbird-l10n-dsb"},
          {"reference": "thunderbird-l10n-el"},
          {"reference": "thunderbird-l10n-en-ca"},
          {"reference": "thunderbird-l10n-en-gb"},
          {"reference": "thunderbird-l10n-es-ar"},
          {"reference": "thunderbird-l10n-es-es"},
          {"reference": "thunderbird-l10n-es-mx"},
          {"reference": "thunderbird-l10n-et"},
          {"reference": "thunderbird-l10n-eu"},
          {"reference": "thunderbird-l10n-fi"},
          {"reference": "thunderbird-l10n-fr"},
          {"reference": "thunderbird-l10n-fy-nl"},
          {"reference": "thunderbird-l10n-ga-ie"},
          {"reference": "thunderbird-l10n-gd"},
          {"reference": "thunderbird-l10n-gl"},
          {"reference": "thunderbird-l10n-he"},
          {"reference": "thunderbird-l10n-hr"},
          {"reference": "thunderbird-l10n-hsb"},
          {"reference": "thunderbird-l10n-hu"},
          {"reference": "thunderbird-l10n-hy-am"},
          {"reference": "thunderbird-l10n-id"},
          {"reference": "thunderbird-l10n-is"},
          {"reference": "thunderbird-l10n-it"},
          {"reference": "thunderbird-l10n-ja"},
          {"reference": "thunderbird-l10n-ka"},
          {"reference": "thunderbird-l10n-kab"},
          {"reference": "thunderbird-l10n-kk"},
          {"reference": "thunderbird-l10n-ko"},
          {"reference": "thunderbird-l10n-lt"},
          {"reference": "thunderbird-l10n-lv"},
          {"reference": "thunderbird-l10n-ms"}
        ]
      }
    ]
  },
  "Debian Linux-13": {
    "package_manager": "dpkg-l",
    "constraints": [
      {
        "release": "13",
        "pkgs": [
          {"reference": "thunderbird"},
          {"reference": "thunderbird-l10n-af"},
          {"reference": "thunderbird-l10n-all"},
          {"reference": "thunderbird-l10n-ar"},
          {"reference": "thunderbird-l10n-ast"},
          {"reference": "thunderbird-l10n-be"},
          {"reference": "thunderbird-l10n-bg"},
          {"reference": "thunderbird-l10n-br"},
          {"reference": "thunderbird-l10n-ca"},
          {"reference": "thunderbird-l10n-cak"},
          {"reference": "thunderbird-l10n-cs"},
          {"reference": "thunderbird-l10n-cy"},
          {"reference": "thunderbird-l10n-da"},
          {"reference": "thunderbird-l10n-de"},
          {"reference": "thunderbird-l10n-dsb"},
          {"reference": "thunderbird-l10n-el"},
          {"reference": "thunderbird-l10n-en-ca"},
          {"reference": "thunderbird-l10n-en-gb"},
          {"reference": "thunderbird-l10n-es-ar"},
          {"reference": "thunderbird-l10n-es-es"},
          {"reference": "thunderbird-l10n-es-mx"},
          {"reference": "thunderbird-l10n-et"},
          {"reference": "thunderbird-l10n-eu"},
          {"reference": "thunderbird-l10n-fi"},
          {"reference": "thunderbird-l10n-fr"},
          {"reference": "thunderbird-l10n-fy-nl"},
          {"reference": "thunderbird-l10n-ga-ie"},
          {"reference": "thunderbird-l10n-gd"},
          {"reference": "thunderbird-l10n-gl"},
          {"reference": "thunderbird-l10n-he"},
          {"reference": "thunderbird-l10n-hr"},
          {"reference": "thunderbird-l10n-hsb"},
          {"reference": "thunderbird-l10n-hu"},
          {"reference": "thunderbird-l10n-hy-am"},
          {"reference": "thunderbird-l10n-id"},
          {"reference": "thunderbird-l10n-is"},
          {"reference": "thunderbird-l10n-it"},
          {"reference": "thunderbird-l10n-ja"},
          {"reference": "thunderbird-l10n-ka"},
          {"reference": "thunderbird-l10n-kab"},
          {"reference": "thunderbird-l10n-kk"},
          {"reference": "thunderbird-l10n-ko"},
          {"reference": "thunderbird-l10n-lt"},
          {"reference": "thunderbird-l10n-lv"},
          {"reference": "thunderbird-l10n-ms"}
        ]
      }
    ]
  },
  "Debian Linux-14": {
    "package_manager": "dpkg-l",
    "constraints": [
      {
        "release": "14",
        "pkgs": [
          {"reference": "thunderbird"},
          {"reference": "thunderbird-l10n-af"},
          {"reference": "thunderbird-l10n-all"},
          {"reference": "thunderbird-l10n-ar"},
          {"reference": "thunderbird-l10n-ast"},
          {"reference": "thunderbird-l10n-be"},
          {"reference": "thunderbird-l10n-bg"},
          {"reference": "thunderbird-l10n-br"},
          {"reference": "thunderbird-l10n-ca"},
          {"reference": "thunderbird-l10n-cak"},
          {"reference": "thunderbird-l10n-cs"},
          {"reference": "thunderbird-l10n-cy"},
          {"reference": "thunderbird-l10n-da"},
          {"reference": "thunderbird-l10n-de"},
          {"reference": "thunderbird-l10n-dsb"},
          {"reference": "thunderbird-l10n-el"},
          {"reference": "thunderbird-l10n-en-ca"},
          {"reference": "thunderbird-l10n-en-gb"},
          {"reference": "thunderbird-l10n-es-ar"},
          {"reference": "thunderbird-l10n-es-es"},
          {"reference": "thunderbird-l10n-es-mx"},
          {"reference": "thunderbird-l10n-et"},
          {"reference": "thunderbird-l10n-eu"},
          {"reference": "thunderbird-l10n-fi"},
          {"reference": "thunderbird-l10n-fr"},
          {"reference": "thunderbird-l10n-fy-nl"},
          {"reference": "thunderbird-l10n-ga-ie"},
          {"reference": "thunderbird-l10n-gd"},
          {"reference": "thunderbird-l10n-gl"},
          {"reference": "thunderbird-l10n-he"},
          {"reference": "thunderbird-l10n-hr"},
          {"reference": "thunderbird-l10n-hsb"},
          {"reference": "thunderbird-l10n-hu"},
          {"reference": "thunderbird-l10n-hy-am"},
          {"reference": "thunderbird-l10n-id"},
          {"reference": "thunderbird-l10n-is"},
          {"reference": "thunderbird-l10n-it"},
          {"reference": "thunderbird-l10n-ja"},
          {"reference": "thunderbird-l10n-ka"},
          {"reference": "thunderbird-l10n-kab"},
          {"reference": "thunderbird-l10n-kk"},
          {"reference": "thunderbird-l10n-ko"},
          {"reference": "thunderbird-l10n-lt"},
          {"reference": "thunderbird-l10n-lv"},
          {"reference": "thunderbird-l10n-ms"}
        ]
      }
    ]
  }
};

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 third_party_support = get_kb_item('Host/OS/extended-third-party');
if (!empty_or_null(third_party_support)) {
    var third_party_vendors = distro_constraints_values['third_party'];
    if (!empty_or_null(third_party_vendors)) {
        var vendor;
        foreach vendor (third_party_vendors) {
            if (vendor == third_party_support) exit(0, 'A third party management patch is available for this vulnerability from ' + vendor + '.\n');
        }
    }
}

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');
}