Ubuntu 25.10 / 26.04 LTS : Luanti vulnerabilities (USN-8366-1)

#%NASL_MIN_LEVEL 80900
##
# (C) Tenable, Inc.
#
# The descriptive text and package checks in this plugin were
# extracted from Ubuntu Security Notice USN-8366-1. The text
# itself is copyright (C) Canonical, Inc. See
# <https://ubuntu.com/security/notices>. Ubuntu(R) is a registered
# trademark of Canonical, Inc.
##

include('compat.inc');

if (description)
{
  script_id(318677);
  script_version("1.1");
  script_set_attribute(attribute:"plugin_modification_date", value:"2026/06/04");

  script_cve_id("CVE-2026-40959", "CVE-2026-40960");
  script_xref(name:"USN", value:"8366-1");

  script_name(english:"Ubuntu 25.10 / 26.04 LTS : Luanti vulnerabilities (USN-8366-1)");

  script_set_attribute(attribute:"synopsis", value:
"The remote Ubuntu host is missing one or more security updates.");
  script_set_attribute(attribute:"description", value:
"The remote Ubuntu 25.10 / 26.04 LTS host has packages installed that are affected by multiple vulnerabilities as
referenced in the USN-8366-1 advisory.

    It was discovered that Luanti, when using LuaJIT, did not properly enforce Lua sandbox restrictions. An
    attacker could possibly use this issue to execute arbitrary code. (CVE-2026-40959)

    It was discovered that Luanti did not properly restrict access to insecure environments. An attacker could
    possibly use this issue to obtain unintended access to the insecure environment or HTTP API.
    (CVE-2026-40960)

Tenable has extracted the preceding description block directly from the Ubuntu 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://ubuntu.com/security/notices/USN-8366-1");
  script_set_attribute(attribute:"solution", value:
"Update the affected packages.");
  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:U/RL:OF/RC:C");
  script_set_cvss3_base_vector("CVSS:3.0/AV:L/AC:L/PR:N/UI:N/S:C/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-2026-40959");

  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:"2026/04/16");
  script_set_attribute(attribute:"patch_publication_date", value:"2026/06/02");
  script_set_attribute(attribute:"plugin_publication_date", value:"2026/06/04");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:canonical:ubuntu_linux:25.10");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:canonical:ubuntu_linux:26.04:-:lts");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:luanti");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:luanti-data");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:luanti-server");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:minetest");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:minetest-data");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:minetest-server");
  script_set_attribute(attribute:"generated_plugin", value:"current");
  script_end_attributes();

  script_category(ACT_GATHER_INFO);
  script_family(english:"Ubuntu Local Security Checks");

  script_copyright(english:"Ubuntu Security Notice (C) 2026 Canonical, Inc. / NASL script (C) 2026 and is owned by Tenable, Inc. or an Affiliate thereof.");

  script_dependencies("ssh_get_info.nasl");
  script_require_keys("Host/cpu", "Host/Ubuntu", "Host/Ubuntu/release", "Host/Debian/dpkg-l");

  exit(0);
}

include('debian_package.inc');

if ( ! get_kb_item('Host/local_checks_enabled') ) audit(AUDIT_LOCAL_CHECKS_NOT_ENABLED);
var os_release = get_kb_item('Host/Ubuntu/release');
if ( isnull(os_release) ) audit(AUDIT_OS_NOT, 'Ubuntu');
os_release = chomp(os_release);
if (! ('25.10' >< os_release || '26.04' >< os_release)) audit(AUDIT_OS_NOT, 'Ubuntu 25.10 / 26.04', 'Ubuntu ' + os_release);
if ( ! get_kb_item('Host/Debian/dpkg-l') ) 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, 'Ubuntu', cpu);

var pkgs = [
    {'osver': '25.10', 'pkgname': 'luanti', 'pkgver': '5.10.0+dfsg-5+deb13u1build0.25.10.1'},
    {'osver': '25.10', 'pkgname': 'luanti-data', 'pkgver': '5.10.0+dfsg-5+deb13u1build0.25.10.1'},
    {'osver': '25.10', 'pkgname': 'luanti-server', 'pkgver': '5.10.0+dfsg-5+deb13u1build0.25.10.1'},
    {'osver': '25.10', 'pkgname': 'minetest', 'pkgver': '5.10.0+dfsg-5+deb13u1build0.25.10.1'},
    {'osver': '25.10', 'pkgname': 'minetest-data', 'pkgver': '5.10.0+dfsg-5+deb13u1build0.25.10.1'},
    {'osver': '25.10', 'pkgname': 'minetest-server', 'pkgver': '5.10.0+dfsg-5+deb13u1build0.25.10.1'},
    {'osver': '26.04', 'pkgname': 'luanti', 'pkgver': '5.10.0+dfsg-5+deb13u1build0.26.04.1'},
    {'osver': '26.04', 'pkgname': 'luanti-data', 'pkgver': '5.10.0+dfsg-5+deb13u1build0.26.04.1'},
    {'osver': '26.04', 'pkgname': 'luanti-server', 'pkgver': '5.10.0+dfsg-5+deb13u1build0.26.04.1'},
    {'osver': '26.04', 'pkgname': 'minetest', 'pkgver': '5.10.0+dfsg-5+deb13u1build0.26.04.1'},
    {'osver': '26.04', 'pkgname': 'minetest-data', 'pkgver': '5.10.0+dfsg-5+deb13u1build0.26.04.1'},
    {'osver': '26.04', 'pkgname': 'minetest-server', 'pkgver': '5.10.0+dfsg-5+deb13u1build0.26.04.1'}
];

var flag = 0;
foreach var package_array ( pkgs ) {
  var osver = NULL;
  var pkgname = NULL;
  var pkgver = NULL;
  if (!empty_or_null(package_array['osver'])) osver = package_array['osver'];
  if (!empty_or_null(package_array['pkgname'])) pkgname = package_array['pkgname'];
  if (!empty_or_null(package_array['pkgver'])) pkgver = package_array['pkgver'];
  if (!empty_or_null(package_array['cves'])) cves = package_array['cves'];
  if (osver && pkgname && pkgver) {
    if (deb_check(release:osver, prefix:pkgname, reference:pkgver, cves:cves)) flag++;
  }
}

if (flag)
{
  var extra = '';
  extra += ubuntu_report_get();
  security_report_v4(
    port       : 0,
    severity   : SECURITY_HOLE,
    extra      : extra
  );
  exit(0);
}
else
{
  var tested = ubuntu_pkg_tests_get();
  if (tested) audit(AUDIT_PACKAGE_NOT_AFFECTED, tested);
  else audit(AUDIT_PACKAGE_NOT_INSTALLED, 'luanti / luanti-data / luanti-server / minetest / minetest-data / etc');
}