Amazon Linux 2 : ipa (ALAS-2026-3950)

#%NASL_MIN_LEVEL 80900
##
# (C) Tenable, Inc.
#
# The descriptive text and package checks in this plugin were
# extracted from Amazon Linux 2 Security Advisory ALAS-2026-3950.
##

include('compat.inc');

if (description)
{
  script_id(351067);
  script_version("1.1");
  script_set_attribute(attribute:"plugin_modification_date", value:"2026/09/29");

  script_cve_id("CVE-2026-18147", "CVE-2026-73197");

  script_name(english:"Amazon Linux 2 : ipa (ALAS-2026-3950)");

  script_set_attribute(attribute:"synopsis", value:
"The remote Amazon Linux 2 host is missing a security update.");
  script_set_attribute(attribute:"description", value:
"It is, therefore, affected by multiple vulnerabilities as referenced in the ALAS2-2026-3950 advisory.

    A flaw was found in FreeIPA. An unauthenticated remote attacker could exploit a DOM Cross-Site Scripting
    (XSS) vulnerability in the FreeIPA/IdM Web UI password reset page. By enticing a victim to click a
    specially crafted link and complete a password reset, the attacker could inject and execute arbitrary
    JavaScript code. This allows the attacker to perform actions within the victim's authenticated session,
    potentially leading to full administrative control if an IdM administrator is targeted. (CVE-2026-18147)

    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)

Tenable has extracted the preceding description block directly from the tested product 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://alas.aws.amazon.com//AL2/ALAS2-2026-3950.html");
  script_set_attribute(attribute:"see_also", value:"https://alas.aws.amazon.com/faqs.html");
  script_set_attribute(attribute:"see_also", value:"https://explore.alas.aws.amazon.com/CVE-2026-18147.html");
  script_set_attribute(attribute:"see_also", value:"https://explore.alas.aws.amazon.com/CVE-2026-73197.html");
  script_set_attribute(attribute:"solution", value:
"Run 'yum update ipa' or
  or 'yum update --advisory ALAS2-2026-3950' to update your system.");
  script_set_cvss_base_vector("CVSS2#AV:N/AC:L/Au:N/C:C/I:C/A:N");
  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:R/S:U/C:H/I:H/A:N");
  script_set_cvss3_temporal_vector("CVSS:3.0/E:U/RL:O/RC:C");
  script_set_attribute(attribute:"cvss_score_source", value:"CVE-2026-18147");

  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:"2026/08/20");
  script_set_attribute(attribute:"patch_publication_date", value:"2026/09/28");
  script_set_attribute(attribute:"plugin_publication_date", value:"2026/09/29");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:ipa-client");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:ipa-client-common");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:ipa-common");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:ipa-debuginfo");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:ipa-python-compat");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:ipa-server");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:ipa-server-common");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:ipa-server-dns");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:ipa-server-trust-ad");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:python2-ipaclient");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:python2-ipalib");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:python2-ipaserver");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:amazon:linux:2");
  script_set_attribute(attribute:"generated_plugin", value:"current");
  script_end_attributes();

  script_category(ACT_GATHER_INFO);
  script_family(english:"Amazon 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/local_checks_enabled", "Host/AmazonLinux/release", "Host/AmazonLinux/rpm-list");

  exit(0);
}

include("rpm2.inc");

if (!get_kb_item("Host/local_checks_enabled")) audit(AUDIT_LOCAL_CHECKS_NOT_ENABLED);

var alas_release = get_kb_item("Host/AmazonLinux/release");
if (isnull(alas_release) || !strlen(alas_release)) audit(AUDIT_OS_NOT, "Amazon Linux");
var os_ver = pregmatch(pattern: "^AL(A|\d+|-\d+)", string:alas_release);
if (isnull(os_ver)) audit(AUDIT_UNKNOWN_APP_VER, "Amazon Linux");
os_ver = os_ver[1];
if (os_ver != "2")
{
  if (os_ver == 'A') os_ver = 'AMI';
  audit(AUDIT_OS_NOT, "Amazon Linux 2", "Amazon Linux " + os_ver);
}

if (!get_kb_item("Host/AmazonLinux/rpm-list")) audit(AUDIT_PACKAGE_LIST_MISSING);

var pkgs = [
    {'reference':'ipa-client-4.6.8-5.amzn2.17.8', 'cpu':'aarch64', 'release':'AL2', 'rpm_spec_vers_cmp':TRUE},
    {'reference':'ipa-client-4.6.8-5.amzn2.17.8', 'cpu':'i686', 'release':'AL2', 'rpm_spec_vers_cmp':TRUE},
    {'reference':'ipa-client-4.6.8-5.amzn2.17.8', 'cpu':'x86_64', 'release':'AL2', 'rpm_spec_vers_cmp':TRUE},
    {'reference':'ipa-client-common-4.6.8-5.amzn2.17.8', 'release':'AL2', 'rpm_spec_vers_cmp':TRUE},
    {'reference':'ipa-common-4.6.8-5.amzn2.17.8', 'release':'AL2', 'rpm_spec_vers_cmp':TRUE},
    {'reference':'ipa-debuginfo-4.6.8-5.amzn2.17.8', 'cpu':'aarch64', 'release':'AL2', 'rpm_spec_vers_cmp':TRUE},
    {'reference':'ipa-debuginfo-4.6.8-5.amzn2.17.8', 'cpu':'i686', 'release':'AL2', 'rpm_spec_vers_cmp':TRUE},
    {'reference':'ipa-debuginfo-4.6.8-5.amzn2.17.8', 'cpu':'x86_64', 'release':'AL2', 'rpm_spec_vers_cmp':TRUE},
    {'reference':'ipa-python-compat-4.6.8-5.amzn2.17.8', 'release':'AL2', 'rpm_spec_vers_cmp':TRUE},
    {'reference':'ipa-server-4.6.8-5.amzn2.17.8', 'cpu':'aarch64', 'release':'AL2', 'rpm_spec_vers_cmp':TRUE},
    {'reference':'ipa-server-4.6.8-5.amzn2.17.8', 'cpu':'i686', 'release':'AL2', 'rpm_spec_vers_cmp':TRUE},
    {'reference':'ipa-server-4.6.8-5.amzn2.17.8', 'cpu':'x86_64', 'release':'AL2', 'rpm_spec_vers_cmp':TRUE},
    {'reference':'ipa-server-common-4.6.8-5.amzn2.17.8', 'release':'AL2', 'rpm_spec_vers_cmp':TRUE},
    {'reference':'ipa-server-dns-4.6.8-5.amzn2.17.8', 'release':'AL2', 'rpm_spec_vers_cmp':TRUE},
    {'reference':'ipa-server-trust-ad-4.6.8-5.amzn2.17.8', 'cpu':'aarch64', 'release':'AL2', 'rpm_spec_vers_cmp':TRUE},
    {'reference':'ipa-server-trust-ad-4.6.8-5.amzn2.17.8', 'cpu':'i686', 'release':'AL2', 'rpm_spec_vers_cmp':TRUE},
    {'reference':'ipa-server-trust-ad-4.6.8-5.amzn2.17.8', 'cpu':'x86_64', 'release':'AL2', 'rpm_spec_vers_cmp':TRUE},
    {'reference':'python2-ipaclient-4.6.8-5.amzn2.17.8', 'release':'AL2', 'rpm_spec_vers_cmp':TRUE},
    {'reference':'python2-ipalib-4.6.8-5.amzn2.17.8', 'release':'AL2', 'rpm_spec_vers_cmp':TRUE},
    {'reference':'python2-ipaserver-4.6.8-5.amzn2.17.8', 'release':'AL2', 'rpm_spec_vers_cmp':TRUE}
];

var flag = 0;
foreach var package_array ( pkgs ) {
  var reference = NULL;
  var _release = NULL;
  var sp = NULL;
  var _cpu = NULL;
  var el_string = NULL;
  var rpm_spec_vers_cmp = NULL;
  var epoch = NULL;
  var allowmaj = NULL;
  var exists_check = NULL;
  var cves = NULL;
  if (!empty_or_null(package_array['reference'])) reference = package_array['reference'];
  if (!empty_or_null(package_array['release'])) _release = package_array['release'];
  if (!empty_or_null(package_array['sp'])) sp = package_array['sp'];
  if (!empty_or_null(package_array['cpu'])) _cpu = package_array['cpu'];
  if (!empty_or_null(package_array['el_string'])) el_string = package_array['el_string'];
  if (!empty_or_null(package_array['rpm_spec_vers_cmp'])) rpm_spec_vers_cmp = package_array['rpm_spec_vers_cmp'];
  if (!empty_or_null(package_array['epoch'])) epoch = package_array['epoch'];
  if (!empty_or_null(package_array['allowmaj'])) allowmaj = package_array['allowmaj'];
  if (!empty_or_null(package_array['exists_check'])) exists_check = package_array['exists_check'];
  if (!empty_or_null(package_array['cves'])) cves = package_array['cves'];
  if (reference && _release && (!exists_check || rpm_exists(release:_release, rpm:exists_check))) {
    if (rpm_check(release:_release, 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-common / etc");
}