Oracle Linux 9 : ELSA-2026-64784-0: / 389-ds-base (ELSA-2026-647840)

#%NASL_MIN_LEVEL 80900
##
# (C) Tenable, Inc.
#
# The descriptive text and package checks in this plugin were
# extracted from Oracle Linux Security Advisory ELSA-2026-647840.
##

include('compat.inc');

if (description)
{
  script_id(343901);
  script_version("1.1");
  script_set_attribute(attribute:"plugin_modification_date", value:"2026/09/08");

  script_cve_id(
    "CVE-2026-18355",
    "CVE-2026-18453",
    "CVE-2026-18922",
    "CVE-2026-76560",
    "CVE-2026-78701"
  );

  script_name(english:"Oracle Linux 9 : ELSA-2026-64784-0: / 389-ds-base (ELSA-2026-647840)");

  script_set_attribute(attribute:"synopsis", value:
"The remote Oracle Linux host is missing one or more security updates.");
  script_set_attribute(attribute:"description", value:
"The remote Oracle Linux 9 host has packages installed that are affected by multiple vulnerabilities as referenced in the
ELSA-2026-647840 advisory.

    - Resolves: RHEL-220502 - CVE-2026-18355 389-ds-base: heap buffer overflow via SASL wrapped-record length
    lower-bound underflow in sasl_io_start_packet() [rhel-9.8.z]
    - Resolves: RHEL-222321 - CVE-2026-18453 389-ds-base: pre-authentication NULL pointer dereference via
    paged results and USE_ONE_BACKEND control in op_shared_search [rhel-9.8.z]
    - Resolves: RHEL-232854 - CVE-2026-18922 389-ds-base: SASL PLAIN authentication allows privilege
    escalation to Directory Manager via stale identity in Cyrus SASL auxiliary property [rhel-9.8.z]
    - Resolves: RHEL-245374 - CVE-2026-76560 389-ds-base: anonymous LDAP client can defeat SELFDN ACI bind-
    rule checks via empty bind DN [rhel-9.8.z]
    - Resolves: RHEL-247865 - CVE-2026-78701 389-ds-base: CVE-2026-11610 incomplete fix may introduce a
    connection-stall DoS [rhel-9.8.z]

Tenable has extracted the preceding description block directly from the Oracle Linux 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://linux.oracle.com/errata/ELSA-2026-64784-0.html");
  script_set_attribute(attribute:"solution", value:
"Update the affected 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: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-2026-18922");

  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:"2026/07/02");
  script_set_attribute(attribute:"patch_publication_date", value:"2026/09/08");
  script_set_attribute(attribute:"plugin_publication_date", value:"2026/09/08");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:oracle:linux:9");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:oracle:linux:389-ds-base");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:oracle:linux:389-ds-base-devel");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:oracle:linux:389-ds-base-libs");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:oracle:linux:389-ds-base-snmp");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:oracle:linux:python3-lib389");
  script_set_attribute(attribute:"generated_plugin", value:"current");
  script_end_attributes();

  script_category(ACT_GATHER_INFO);
  script_family(english:"Oracle Linux 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/OracleLinux", "Host/RedHat/release", "Host/RedHat/rpm-list", "Host/local_checks_enabled");

  exit(0);
}


include('rpm2.inc');

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) || !pregmatch(pattern: "Oracle (?:Linux Server|Enterprise Linux)", string:os_product)) audit(AUDIT_OS_NOT, 'Oracle Linux');
var os_version = get_kb_item('installed_os/local/SSH/0/version');
if (isnull(os_version)) audit(AUDIT_UNKNOWN_APP_VER, 'Oracle Linux');
if (! preg(pattern:"^9([^0-9]|$)", string:os_version)) audit(AUDIT_OS_NOT, 'Oracle Linux 9.x', 'Oracle Linux ' + os_version);

if (!get_kb_item('Host/RedHat/rpm-list')) 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$" && 'aarch64' >!< cpu) audit(AUDIT_LOCAL_CHECKS_NOT_IMPLEMENTED, 'Oracle Linux', cpu);

var constraints = [
  {
    'release': '9',
    'pkgs': [
      {'reference':'389-ds-base-2.8.0-10.el9_8', 'cpu':'aarch64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'389-ds-base-devel-2.8.0-10.el9_8', 'cpu':'aarch64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'389-ds-base-libs-2.8.0-10.el9_8', 'cpu':'aarch64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'389-ds-base-snmp-2.8.0-10.el9_8', 'cpu':'aarch64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'python3-lib389-2.8.0-10.el9_8', 'cpu':'aarch64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'389-ds-base-2.8.0-10.el9_8', 'cpu':'x86_64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'389-ds-base-devel-2.8.0-10.el9_8', 'cpu':'x86_64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'389-ds-base-libs-2.8.0-10.el9_8', 'cpu':'x86_64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'389-ds-base-snmp-2.8.0-10.el9_8', 'cpu':'x86_64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'python3-lib389-2.8.0-10.el9_8', '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, '389-ds-base / 389-ds-base-devel / 389-ds-base-libs / etc');
}