Debian dla-4692 : ctdb - security update

#%NASL_MIN_LEVEL 80900
#
# (C) Tenable, Inc.
#
# The descriptive text and package checks in this plugin were
# extracted from Debian Security Advisory dla-4692. The text
# itself is copyright (C) Software in the Public Interest, Inc.
#

include('compat.inc');

if (description)
{
  script_id(328762);
  script_version("1.1");
  script_set_attribute(attribute:"plugin_modification_date", value:"2026/07/21");

  script_cve_id(
    "CVE-2026-2340",
    "CVE-2026-3012",
    "CVE-2026-3238",
    "CVE-2026-4408",
    "CVE-2026-4480"
  );
  script_xref(name:"IAVA", value:"2026-A-0510");

  script_name(english:"Debian dla-4692 : ctdb - security update");

  script_set_attribute(attribute:"synopsis", value:
"The remote Debian host is missing one or more security-related updates.");
  script_set_attribute(attribute:"description", value:
"The remote Debian 11 host has packages installed that are affected by multiple vulnerabilities as referenced in the
dla-4692 advisory.

    -------------------------------------------------------------------------
    Debian LTS Advisory DLA-4692-1                [email protected]
    https://www.debian.org/lts/security/                      Markus Koschany
    July 21, 2026                                 https://wiki.debian.org/LTS
    -------------------------------------------------------------------------

    Package        : samba
    Version        : 2:4.13.13+dfsg-1~deb11u8
    CVE ID         : CVE-2026-2340 CVE-2026-3012 CVE-2026-3238 CVE-2026-4408
                     CVE-2026-4480

    Several vulnerabilities have been discovered in Samba, a SMB/CIFS file,
    print, and login server for Unix, which might result in bypass of access
    checks, overwrite of files in unintended situations using the WORM vfs
    module, installing CA certificates over http without verification when
    auto-enrollment GPO is enabled, denial of service or remote code
    execution.

    For Debian 11 bullseye, these problems have been fixed in version
    2:4.13.13+dfsg-1~deb11u8.

    We recommend that you upgrade your samba packages.

    For the detailed security status of samba please refer to
    its security tracker page at:
    https://security-tracker.debian.org/tracker/samba

    Further information about Debian LTS security advisories, how to apply
    these updates to your system and frequently asked questions can be
    found at: https://wiki.debian.org/LTS
    Attachment:
    signature.asc
    Description: This is a digitally signed message part

Tenable has extracted the preceding description block directly from the Debian 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://security-tracker.debian.org/tracker/source-package/samba");
  script_set_attribute(attribute:"see_also", value:"https://security-tracker.debian.org/tracker/CVE-2026-2340");
  script_set_attribute(attribute:"see_also", value:"https://security-tracker.debian.org/tracker/CVE-2026-3012");
  script_set_attribute(attribute:"see_also", value:"https://security-tracker.debian.org/tracker/CVE-2026-3238");
  script_set_attribute(attribute:"see_also", value:"https://security-tracker.debian.org/tracker/CVE-2026-4408");
  script_set_attribute(attribute:"see_also", value:"https://security-tracker.debian.org/tracker/CVE-2026-4480");
  script_set_attribute(attribute:"see_also", value:"https://packages.debian.org/source/bullseye/samba");
  script_set_attribute(attribute:"solution", value:
"Upgrade the ctdb packages.");
  script_set_cvss_base_vector("CVSS2#AV:N/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:N/AC:L/PR:N/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-2026-4480");

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

  script_set_attribute(attribute:"vuln_publication_date", value:"2026/05/26");
  script_set_attribute(attribute:"patch_publication_date", value:"2026/07/21");
  script_set_attribute(attribute:"plugin_publication_date", value:"2026/07/21");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:ctdb");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:libnss-winbind");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:libpam-winbind");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:libsmbclient");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:libsmbclient-dev");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:libwbclient-dev");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:libwbclient0");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:python3-samba");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:registry-tools");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:samba");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:samba-common");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:samba-common-bin");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:samba-dev");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:samba-dsdb-modules");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:samba-libs");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:samba-testsuite");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:samba-vfs-modules");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:smbclient");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:winbind");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:debian:debian_linux:11.0");
  script_set_attribute(attribute:"generated_plugin", value:"current");
  script_set_attribute(attribute:"stig_severity", value:"I");
  script_end_attributes();

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

  script_copyright(english:"This script is Copyright (C) 2026 and is owned by Tenable, Inc. or an Affiliate thereof.");

  script_dependencies("ssh_get_info.nasl");
  script_require_keys("Host/local_checks_enabled", "Host/Debian/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);
if (!get_kb_item("Host/Debian/dpkg-l")) audit(AUDIT_PACKAGE_LIST_MISSING);

var debian_release = get_kb_item('Host/Debian/release');
if ( isnull(debian_release) ) audit(AUDIT_OS_NOT, 'Debian');
debian_release = chomp(debian_release);
if (! preg(pattern:"^(11)\.[0-9]+", string:debian_release)) audit(AUDIT_OS_NOT, 'Debian 11.0', 'Debian ' + debian_release);
var cpu = get_kb_item('Host/cpu');
if (isnull(cpu)) audit(AUDIT_UNKNOWN_ARCH);
if ('x86_64' >!< cpu && cpu !~ "^i[3-6]86$" && 'aarch64' >!< cpu) audit(AUDIT_LOCAL_CHECKS_NOT_IMPLEMENTED, 'Debian', cpu);

var pkgs = [
    {'release': '11.0', 'prefix': 'ctdb', 'reference': '2:4.13.13+dfsg-1~deb11u8'},
    {'release': '11.0', 'prefix': 'libnss-winbind', 'reference': '2:4.13.13+dfsg-1~deb11u8'},
    {'release': '11.0', 'prefix': 'libpam-winbind', 'reference': '2:4.13.13+dfsg-1~deb11u8'},
    {'release': '11.0', 'prefix': 'libsmbclient', 'reference': '2:4.13.13+dfsg-1~deb11u8'},
    {'release': '11.0', 'prefix': 'libsmbclient-dev', 'reference': '2:4.13.13+dfsg-1~deb11u8'},
    {'release': '11.0', 'prefix': 'libwbclient-dev', 'reference': '2:4.13.13+dfsg-1~deb11u8'},
    {'release': '11.0', 'prefix': 'libwbclient0', 'reference': '2:4.13.13+dfsg-1~deb11u8'},
    {'release': '11.0', 'prefix': 'python3-samba', 'reference': '2:4.13.13+dfsg-1~deb11u8'},
    {'release': '11.0', 'prefix': 'registry-tools', 'reference': '2:4.13.13+dfsg-1~deb11u8'},
    {'release': '11.0', 'prefix': 'samba', 'reference': '2:4.13.13+dfsg-1~deb11u8'},
    {'release': '11.0', 'prefix': 'samba-common', 'reference': '2:4.13.13+dfsg-1~deb11u8'},
    {'release': '11.0', 'prefix': 'samba-common-bin', 'reference': '2:4.13.13+dfsg-1~deb11u8'},
    {'release': '11.0', 'prefix': 'samba-dev', 'reference': '2:4.13.13+dfsg-1~deb11u8'},
    {'release': '11.0', 'prefix': 'samba-dsdb-modules', 'reference': '2:4.13.13+dfsg-1~deb11u8'},
    {'release': '11.0', 'prefix': 'samba-libs', 'reference': '2:4.13.13+dfsg-1~deb11u8'},
    {'release': '11.0', 'prefix': 'samba-testsuite', 'reference': '2:4.13.13+dfsg-1~deb11u8'},
    {'release': '11.0', 'prefix': 'samba-vfs-modules', 'reference': '2:4.13.13+dfsg-1~deb11u8'},
    {'release': '11.0', 'prefix': 'smbclient', 'reference': '2:4.13.13+dfsg-1~deb11u8'},
    {'release': '11.0', 'prefix': 'winbind', 'reference': '2:4.13.13+dfsg-1~deb11u8'}
];

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

if (flag)
{
  security_report_v4(
    port       : 0,
    severity   : SECURITY_HOLE,
    extra      : deb_report_get()
  );
  exit(0);
}
else
{
  var tested = deb_pkg_tests_get();
  if (tested) audit(AUDIT_PACKAGE_NOT_AFFECTED, tested);
  else audit(AUDIT_PACKAGE_NOT_INSTALLED, 'ctdb / libnss-winbind / libpam-winbind / libsmbclient / etc');
}