CentOS Linux 8 [TuxCare] Security Update: ctdb / libnetapi / libnetapi-devel / libsmbclient / etc Multiple Vulnerabilities (CENTOS-STREAM8:CLSA-2026:1781101271)

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

include('compat.inc');

if (description)
{
  script_id(360456);
  script_version("1.1");
  script_set_attribute(attribute:"plugin_modification_date", value:"2026/10/01");

  script_cve_id("CVE-2026-3012", "CVE-2026-4408");
  script_xref(name:"CLSA", value:"2026:1781101271");

  script_name(english:"CentOS Linux 8 [TuxCare] Security Update: ctdb / libnetapi / libnetapi-devel / libsmbclient / etc Multiple Vulnerabilities (CENTOS-STREAM8:CLSA-2026:1781101271)");

  script_set_attribute(attribute:"synopsis", value:
"The CentOS Linux host is missing one or more security updates.");
  script_set_attribute(attribute:"description", value:
"The CentOS Linux 8 host has packages installed that are affected by multiple vulnerabilities as referenced in the
TuxCare CENTOS-STREAM8:CLSA-2026:1781101271 advisory.

  - A flaw was found in Samba's certificate auto-enrollment Group Policy handling. When certificate auto-
    enrollment is enabled, Samba may retrieve a CA certificate over an unencrypted HTTP connection and install
    it into the local trust store without proper verification. An attacker with the ability to intercept or
    redirect network traffic could exploit this behavior to supply a malicious certificate authority
    certificate, potentially allowing interception or spoofing of trusted communications. (CVE-2026-3012)

  - A flaw was found in Samba. A remote attacker can exploit a misconfiguration in Samba file servers and
    classic domain controllers that use the check password script feature. If this script is configured with
    the %u substitution character, the client-controlled username is passed without proper escaping of shell
    meta-characters. This vulnerability allows an attacker to achieve remote command execution on the affected
    system. This issue primarily affects non-standard configurations where the check password script is used
    with %u and the samba-dcerpcd service is started as a system service. (CVE-2026-4408)

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version
number.");
  # https://security.tuxcare.com/csaf/v2/els_os/centos-stream8els/advisories/2026/clsa-2026_1781101271.json
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?dc62a9cc");
  script_set_attribute(attribute:"see_also", value:"https://cve.tuxcare.com/els/releases/CLSA-2026:1781101271");
  script_set_attribute(attribute:"solution", value:
"Update the affected packages based on the guidance in TuxCare advisory CENTOS-STREAM8:CLSA-2026:1781101271.");
  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:U/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:U/RL:O/RC:C");
  script_set_attribute(attribute:"cvss_score_source", value:"CVE-2026-4408");

  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_severity", value:"Critical");

  script_set_attribute(attribute:"vuln_publication_date", value:"2026/05/27");
  script_set_attribute(attribute:"patch_publication_date", value:"2026/06/10");
  script_set_attribute(attribute:"plugin_publication_date", value:"2026/10/01");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"generated_plugin", value:"current");
  script_end_attributes();

  script_category(ACT_GATHER_INFO);
  script_family(english:"CentOS 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_info2.nasl");
  script_require_keys("Host/OS/extended-third-party", "Host/local_checks_enabled", "Host/CentOS/release", "Host/CentOS/rpm-list");

  exit(0);
}
include('rpm2.inc');

var third_party_support = get_kb_item('Host/OS/extended-third-party');
if (empty_or_null(third_party_support) || third_party_support != 'TuxCare') exit(0, 'TuxCare support not enabled.');

if (!get_kb_item('Host/local_checks_enabled')) audit(AUDIT_LOCAL_CHECKS_NOT_ENABLED);
var os_product = get_kb_item('installed_os/local/SSH/0/product');
if (isnull(os_product) || 'CentOS Linux' >!< os_product) audit(AUDIT_OS_NOT, 'CentOS Linux');
var os_version = get_kb_item('installed_os/local/SSH/0/version');
if (isnull(os_version)) audit(AUDIT_UNKNOWN_APP_VER, 'CentOS Linux');
if (! preg(pattern:"^8([^0-9]|$)", string:os_version)) audit(AUDIT_OS_NOT, 'CentOS Linux 8', 'CentOS Linux ' + os_version);

if (!get_kb_item('Host/CentOS/rpm-list')) audit(AUDIT_PACKAGE_LIST_MISSING);

var cpu = get_kb_item('Host/cpu');
if (isnull(cpu)) audit(AUDIT_UNKNOWN_ARCH);
if (cpu !~ "^i[3-6]86$" && 'x86_64' >!< cpu) audit(AUDIT_LOCAL_CHECKS_NOT_IMPLEMENTED, 'CentOS Linux', cpu);


var constraints = [
  {
    'release': '8',
    'pkgs': [
      {'reference':'ctdb-4.19.4-4.el8.tuxcare.els2', 'cpu':'x86_64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'libnetapi-4.19.4-4.el8.tuxcare.els2', 'cpu':'i686', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'libnetapi-4.19.4-4.el8.tuxcare.els2', 'cpu':'x86_64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'libnetapi-devel-4.19.4-4.el8.tuxcare.els2', 'cpu':'i686', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'libnetapi-devel-4.19.4-4.el8.tuxcare.els2', 'cpu':'x86_64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'libsmbclient-4.19.4-4.el8.tuxcare.els2', 'cpu':'i686', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'libsmbclient-4.19.4-4.el8.tuxcare.els2', 'cpu':'x86_64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'libsmbclient-devel-4.19.4-4.el8.tuxcare.els2', 'cpu':'i686', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'libsmbclient-devel-4.19.4-4.el8.tuxcare.els2', 'cpu':'x86_64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'libwbclient-4.19.4-4.el8.tuxcare.els2', 'cpu':'i686', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'libwbclient-4.19.4-4.el8.tuxcare.els2', 'cpu':'x86_64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'libwbclient-devel-4.19.4-4.el8.tuxcare.els2', 'cpu':'i686', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'libwbclient-devel-4.19.4-4.el8.tuxcare.els2', 'cpu':'x86_64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'python3-samba-4.19.4-4.el8.tuxcare.els2', 'cpu':'i686', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'python3-samba-4.19.4-4.el8.tuxcare.els2', 'cpu':'x86_64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'python3-samba-dc-4.19.4-4.el8.tuxcare.els2', 'cpu':'x86_64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'python3-samba-devel-4.19.4-4.el8.tuxcare.els2', 'cpu':'i686', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'python3-samba-devel-4.19.4-4.el8.tuxcare.els2', 'cpu':'x86_64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'python3-samba-test-4.19.4-4.el8.tuxcare.els2', 'cpu':'x86_64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'samba-4.19.4-4.el8.tuxcare.els2', 'cpu':'x86_64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'samba-client-4.19.4-4.el8.tuxcare.els2', 'cpu':'x86_64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'samba-client-libs-4.19.4-4.el8.tuxcare.els2', 'cpu':'i686', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'samba-client-libs-4.19.4-4.el8.tuxcare.els2', 'cpu':'x86_64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'samba-common-4.19.4-4.el8.tuxcare.els2', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'samba-common-libs-4.19.4-4.el8.tuxcare.els2', 'cpu':'i686', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'samba-common-libs-4.19.4-4.el8.tuxcare.els2', 'cpu':'x86_64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'samba-common-tools-4.19.4-4.el8.tuxcare.els2', 'cpu':'x86_64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'samba-dc-libs-4.19.4-4.el8.tuxcare.els2', 'cpu':'i686', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'samba-dc-libs-4.19.4-4.el8.tuxcare.els2', 'cpu':'x86_64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'samba-dcerpc-4.19.4-4.el8.tuxcare.els2', 'cpu':'x86_64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'samba-devel-4.19.4-4.el8.tuxcare.els2', 'cpu':'i686', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'samba-devel-4.19.4-4.el8.tuxcare.els2', 'cpu':'x86_64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'samba-krb5-printing-4.19.4-4.el8.tuxcare.els2', 'cpu':'x86_64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'samba-ldb-ldap-modules-4.19.4-4.el8.tuxcare.els2', 'cpu':'x86_64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'samba-libs-4.19.4-4.el8.tuxcare.els2', 'cpu':'i686', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'samba-libs-4.19.4-4.el8.tuxcare.els2', 'cpu':'x86_64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'samba-pidl-4.19.4-4.el8.tuxcare.els2', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'samba-test-4.19.4-4.el8.tuxcare.els2', 'cpu':'x86_64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'samba-test-libs-4.19.4-4.el8.tuxcare.els2', 'cpu':'x86_64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'samba-tools-4.19.4-4.el8.tuxcare.els2', 'cpu':'x86_64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'samba-usershares-4.19.4-4.el8.tuxcare.els2', 'cpu':'x86_64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'samba-vfs-iouring-4.19.4-4.el8.tuxcare.els2', 'cpu':'x86_64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'samba-winbind-4.19.4-4.el8.tuxcare.els2', 'cpu':'x86_64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'samba-winbind-clients-4.19.4-4.el8.tuxcare.els2', 'cpu':'x86_64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'samba-winbind-krb5-locator-4.19.4-4.el8.tuxcare.els2', 'cpu':'x86_64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'samba-winbind-modules-4.19.4-4.el8.tuxcare.els2', 'cpu':'i686', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'samba-winbind-modules-4.19.4-4.el8.tuxcare.els2', 'cpu':'x86_64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'samba-winexe-4.19.4-4.el8.tuxcare.els2', 'cpu':'x86_64', 'rpm_spec_vers_cmp':TRUE}
    ]
  }
];

var os_release = get_one_kb_item('installed_os/local/SSH/0/release');
var os_sp = get_one_kb_item('Host/*/minor_release');

var flag = 0;
var reference;
var sp;
var _cpu;
var el_string;
var rpm_spec_vers_cmp;
var epoch;
var allowmaj;
var exists_check;
var cves;
foreach var constraint ( constraints ) {
  # Check that the target release is equal to the affected release
  if (!empty_or_null(constraint['release'])){
    if (constraint['release'] != os_release) continue;
  }
  if (!empty_or_null(constraint['sp'])){
    if (constraint['sp'] != os_sp) continue;
  }
  foreach var pkg ( constraint['pkgs'] ) {
    reference = NULL;
    sp = NULL;
    _cpu = NULL;
    el_string = NULL;
    rpm_spec_vers_cmp = NULL;
    epoch = NULL;
    allowmaj = NULL;
    exists_check = NULL;
    cves = NULL;
    if (!empty_or_null(pkg['reference'])) reference = pkg['reference'];
    if (!empty_or_null(pkg['sp'])) sp = pkg['sp'];
    if (!empty_or_null(pkg['cpu'])) _cpu = pkg['cpu'];
    if (!empty_or_null(pkg['el_string'])) el_string = pkg['el_string'];
    if (!empty_or_null(pkg['rpm_spec_vers_cmp'])) rpm_spec_vers_cmp = pkg['rpm_spec_vers_cmp'];
    if (!empty_or_null(pkg['epoch'])) epoch = pkg['epoch'];
    if (!empty_or_null(pkg['allowmaj'])) allowmaj = pkg['allowmaj'];
    if (!empty_or_null(pkg['exists_check'])) exists_check = pkg['exists_check'];
    if (!empty_or_null(pkg['cves'])) cves = pkg['cves'];
    if (reference &&
        ## (no known rpm to check OR known rpm_exists)
        (!exists_check || rpm_exists(rpm:exists_check)) &&
        rpm_check(sp:sp, cpu:_cpu, reference:reference, epoch:epoch, el_string:el_string, rpm_spec_vers_cmp:rpm_spec_vers_cmp, allowmaj:allowmaj, cves:cves)) flag++;
  }
}


if (flag)
{
  security_report_v4(
      port       : 0,
      severity   : SECURITY_HOLE,
      extra      : rpm_report_get()
  );
  exit(0);
}
else
{
  var tested = pkg_tests_get();
  if (tested) audit(AUDIT_PACKAGE_NOT_AFFECTED, tested);
  else audit(AUDIT_PACKAGE_NOT_INSTALLED, 'ctdb / libnetapi / libnetapi-devel / libsmbclient / etc');
}