AlmaLinux 9.2 [TuxCare] Security Update: ipa-client / ipa-client-common / ipa-client-epn / ipa-client-samba / etc Multiple Vulnerabilities (ALMALINUX9.2:CLSA-2026:1791563836)

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

include('compat.inc');

if (description)
{
  script_id(364496);
  script_version("1.1");
  script_set_attribute(attribute:"plugin_modification_date", value:"2026/10/09");

  script_cve_id(
    "CVE-2026-73197",
    "CVE-2026-73198",
    "CVE-2026-76578",
    "CVE-2026-79678"
  );
  script_xref(name:"CLSA", value:"2026:1791563836");

  script_name(english:"AlmaLinux 9.2 [TuxCare] Security Update: ipa-client / ipa-client-common / ipa-client-epn / ipa-client-samba / etc Multiple Vulnerabilities (ALMALINUX9.2:CLSA-2026:1791563836)");

  script_set_attribute(attribute:"synopsis", value:
"The AlmaLinux host is missing one or more security updates.");
  script_set_attribute(attribute:"description", value:
"The AlmaLinux 9.2 host has packages installed that are affected by multiple vulnerabilities as referenced in the TuxCare
ALMALINUX9.2:CLSA-2026:1791563836 advisory.

  - A flaw was found in FreeIPA. A remote, unauthenticated attacker can exploit this vulnerability by sending
    oversized form POST requests to the `/ipa/migration/migration.py` endpoint. This can force the migration
    handler to read attacker-controlled request bodies fully into memory, leading to increased memory usage,
    slower request handling, and potential service disruption or denial of service. (CVE-2026-73197)

  - A flaw was found in FreeIPA. A remote, unauthenticated attacker can exploit a vulnerability in the
    `/ipa/i18n_messages` endpoint by sending an arbitrarily large request body. This can cause the service to
    consume excessive memory, leading to memory exhaustion, degraded responsiveness, and a denial of service
    (DoS) condition. (CVE-2026-73198)

  - A flaw was found in FreeIPA. The self-managed OTP token ACI does not require authentication and does not
    restrict which attributes may be added alongside the token entry. An unauthenticated LDAP client can
    exploit this, combined with a related flaw in the underlying directory server's ACI evaluation (tracked
    separately), to create an arbitrary attacker-controlled Kerberos principal and have it added to the
    administrators group. This allows a remote, unauthenticated attacker to obtain genuine FreeIPA
    administrator-group membership and perform administrative operations against the directory and, on SID-
    enabled deployments, other IdM services. (CVE-2026-76578)

  - A flaw was found in FreeIPA's idp-add command, where insufficiently validated --organization/--base-url
    input reaches a constrained eval() call before the corresponding LDAP access control check is enforced.
    This allows any authenticated IPA principal, regardless of privilege level, to enumerate and read the
    environment variables of the affected server process and to cause denial of service via memory exhaustion.
    (CVE-2026-79678)

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/almalinux9.2esu/advisories/2026/clsa-2026_1791563836.json
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?1d4da262");
  script_set_attribute(attribute:"see_also", value:"https://cve.tuxcare.com/els/releases/CLSA-2026:1791563836");
  script_set_attribute(attribute:"solution", value:
"Update the affected packages based on the guidance in TuxCare advisory ALMALINUX9.2:CLSA-2026:1791563836.");
  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-2026-76578");

  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:"2026/08/20");
  script_set_attribute(attribute:"patch_publication_date", value:"2026/10/09");
  script_set_attribute(attribute:"plugin_publication_date", value:"2026/10/09");

  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:"Alma 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_info2.nasl");
  script_require_keys("Host/OS/extended-third-party", "Host/local_checks_enabled", "Host/AlmaLinux/release", "Host/AlmaLinux/rpm-list", "Host/cpu");

  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) || 'AlmaLinux' >!< os_product) audit(AUDIT_OS_NOT, 'AlmaLinux');
var os_version = get_kb_item('installed_os/local/SSH/0/version');
if (isnull(os_version)) audit(AUDIT_UNKNOWN_APP_VER, 'AlmaLinux');
if (! preg(pattern:"^9.2([^0-9]|$)", string:os_version)) audit(AUDIT_OS_NOT, 'AlmaLinux 9.2', 'AlmaLinux ' + os_version);

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

var cpu = get_kb_item('Host/cpu');
if (isnull(cpu)) audit(AUDIT_UNKNOWN_ARCH);
if ('aarch64' >!< cpu && cpu !~ "^i[3-6]86$" && 'x86_64' >!< cpu) audit(AUDIT_LOCAL_CHECKS_NOT_IMPLEMENTED, 'AlmaLinux', cpu);


var constraints = [
  {
    'release': '9',
    'sp': '2',
    'pkgs': [
      {'reference':'ipa-client-4.10.1-9.el9_2.alma.1.tuxcare.els5', 'sp':'2', 'cpu':'aarch64', 'el_string':'el9_2', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'ipa-client-4.10.1-9.el9_2.alma.1.tuxcare.els5', 'sp':'2', 'cpu':'i686', 'el_string':'el9_2', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'ipa-client-4.10.1-9.el9_2.alma.1.tuxcare.els5', 'sp':'2', 'cpu':'x86_64', 'el_string':'el9_2', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'ipa-client-common-4.10.1-9.el9_2.alma.1.tuxcare.els5', 'sp':'2', 'el_string':'el9_2', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'ipa-client-epn-4.10.1-9.el9_2.alma.1.tuxcare.els5', 'sp':'2', 'cpu':'aarch64', 'el_string':'el9_2', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'ipa-client-epn-4.10.1-9.el9_2.alma.1.tuxcare.els5', 'sp':'2', 'cpu':'i686', 'el_string':'el9_2', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'ipa-client-epn-4.10.1-9.el9_2.alma.1.tuxcare.els5', 'sp':'2', 'cpu':'x86_64', 'el_string':'el9_2', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'ipa-client-samba-4.10.1-9.el9_2.alma.1.tuxcare.els5', 'sp':'2', 'cpu':'aarch64', 'el_string':'el9_2', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'ipa-client-samba-4.10.1-9.el9_2.alma.1.tuxcare.els5', 'sp':'2', 'cpu':'i686', 'el_string':'el9_2', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'ipa-client-samba-4.10.1-9.el9_2.alma.1.tuxcare.els5', 'sp':'2', 'cpu':'x86_64', 'el_string':'el9_2', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'ipa-common-4.10.1-9.el9_2.alma.1.tuxcare.els5', 'sp':'2', 'el_string':'el9_2', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'ipa-python-compat-4.10.1-9.el9_2.alma.1.tuxcare.els5', 'sp':'2', 'el_string':'el9_2', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'ipa-selinux-4.10.1-9.el9_2.alma.1.tuxcare.els5', 'sp':'2', 'el_string':'el9_2', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'ipa-server-4.10.1-9.el9_2.alma.1.tuxcare.els5', 'sp':'2', 'cpu':'aarch64', 'el_string':'el9_2', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'ipa-server-4.10.1-9.el9_2.alma.1.tuxcare.els5', 'sp':'2', 'cpu':'x86_64', 'el_string':'el9_2', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'ipa-server-common-4.10.1-9.el9_2.alma.1.tuxcare.els5', 'sp':'2', 'el_string':'el9_2', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'ipa-server-dns-4.10.1-9.el9_2.alma.1.tuxcare.els5', 'sp':'2', 'el_string':'el9_2', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'ipa-server-trust-ad-4.10.1-9.el9_2.alma.1.tuxcare.els5', 'sp':'2', 'cpu':'aarch64', 'el_string':'el9_2', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'ipa-server-trust-ad-4.10.1-9.el9_2.alma.1.tuxcare.els5', 'sp':'2', 'cpu':'x86_64', 'el_string':'el9_2', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'python3-ipaclient-4.10.1-9.el9_2.alma.1.tuxcare.els5', 'sp':'2', 'el_string':'el9_2', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'python3-ipalib-4.10.1-9.el9_2.alma.1.tuxcare.els5', 'sp':'2', 'el_string':'el9_2', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'python3-ipaserver-4.10.1-9.el9_2.alma.1.tuxcare.els5', 'sp':'2', 'el_string':'el9_2', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'python3-ipatests-4.10.1-9.el9_2.alma.1.tuxcare.els5', 'sp':'2', 'el_string':'el9_2', '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, 'ipa-client / ipa-client-common / ipa-client-epn / ipa-client-samba / etc');
}