CentOS Linux 6 [TuxCare] Security Update: openldap / openldap-clients / openldap-devel / openldap-servers / etc Multiple Vulnerabilities (CENTOS6:CLSA-2025:1758645818)

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

include('compat.inc');

if (description)
{
  script_id(361807);
  script_version("1.1");
  script_set_attribute(attribute:"plugin_modification_date", value:"2026/10/01");

  script_cve_id(
    "CVE-2019-13565",
    "CVE-2020-12243",
    "CVE-2020-25692",
    "CVE-2020-25709",
    "CVE-2020-25710",
    "CVE-2020-36221",
    "CVE-2020-36222",
    "CVE-2020-36223",
    "CVE-2020-36224",
    "CVE-2020-36225",
    "CVE-2020-36226",
    "CVE-2020-36227",
    "CVE-2020-36228",
    "CVE-2020-36229",
    "CVE-2020-36230"
  );
  script_xref(name:"CLSA", value:"2025:1758645818");

  script_name(english:"CentOS Linux 6 [TuxCare] Security Update: openldap / openldap-clients / openldap-devel / openldap-servers / etc Multiple Vulnerabilities (CENTOS6:CLSA-2025:1758645818)");

  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 6 host has packages installed that are affected by multiple vulnerabilities as referenced in the
TuxCare CENTOS6:CLSA-2025:1758645818 advisory.

  - An issue was discovered in OpenLDAP 2.x before 2.4.48. When using SASL authentication and session
    encryption, and relying on the SASL security layers in slapd access controls, it is possible to obtain
    access that would otherwise be denied via a simple bind for any identity covered in those ACLs. After the
    first SASL bind is completed, the sasl_ssf value is retained for all new non-SASL connections. Depending
    on the ACL configuration, this can affect different types of operations (searches, modifications, etc.).
    In other words, a successful authorization step completed by one user affects the authorization
    requirement for a different user. (CVE-2019-13565)

  - In filter.c in slapd in OpenLDAP before 2.4.50, LDAP search filters with nested boolean expressions can
    result in denial of service (daemon crash). (CVE-2020-12243)

  - A NULL pointer dereference was found in OpenLDAP server and was fixed in openldap 2.4.55, during a request
    for renaming RDNs. An unauthenticated attacker could remotely crash the slapd process by sending a
    specially crafted request, causing a Denial of Service. (CVE-2020-25692)

  - A flaw was found in OpenLDAP. This flaw allows an attacker who can send a malicious packet to be processed
    by OpenLDAP's slapd server, to trigger an assertion failure. The highest threat from this vulnerability is
    to system availability. (CVE-2020-25709)

  - A flaw was found in OpenLDAP in versions before 2.4.56. This flaw allows an attacker who sends a malicious
    packet processed by OpenLDAP to force a failed assertion in csnNormalize23(). The highest threat from this
    vulnerability is to system availability. (CVE-2020-25710)

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/centos6els/advisories/2025/clsa-2025_1758645818.json
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?c76d69a7");
  script_set_attribute(attribute:"see_also", value:"https://cve.tuxcare.com/els/releases/CLSA-2025:1758645818");
  script_set_attribute(attribute:"solution", value:
"Update the affected packages based on the guidance in TuxCare advisory CENTOS6:CLSA-2025:1758645818.");
  script_set_cvss_base_vector("CVSS2#AV:N/AC:L/Au:N/C:P/I:N/A:N");
  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:N/A:N");
  script_set_cvss3_temporal_vector("CVSS:3.0/E:P/RL:O/RC:C");
  script_set_attribute(attribute:"cvss_score_source", value:"CVE-2019-13565");

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

  script_set_attribute(attribute:"vuln_publication_date", value:"2019/07/26");
  script_set_attribute(attribute:"patch_publication_date", value:"2025/09/23");
  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:"^6([^0-9]|$)", string:os_version)) audit(AUDIT_OS_NOT, 'CentOS Linux 6', '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': '6',
    'pkgs': [
      {'reference':'openldap-2.4.58-1.el6.tuxcare.els1', 'cpu':'i686', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'openldap-2.4.58-1.el6.tuxcare.els1', 'cpu':'x86_64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'openldap-clients-2.4.58-1.el6.tuxcare.els1', 'cpu':'x86_64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'openldap-devel-2.4.58-1.el6.tuxcare.els1', 'cpu':'i686', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'openldap-devel-2.4.58-1.el6.tuxcare.els1', 'cpu':'x86_64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'openldap-servers-2.4.58-1.el6.tuxcare.els1', 'cpu':'x86_64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'openldap-servers-sql-2.4.58-1.el6.tuxcare.els1', '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_WARNING,
      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, 'openldap / openldap-clients / openldap-devel / openldap-servers / etc');
}