Amazon Linux 2023 : bind, bind-chroot, bind-devel (ALAS2023-2026-3312)

#%NASL_MIN_LEVEL 80900
##
# (C) Tenable, Inc.
#
# The descriptive text and package checks in this plugin were
# extracted from Amazon Linux 2023 Security Advisory ALAS2023-2026-3312.
##

include('compat.inc');

if (description)
{
  script_id(371851);
  script_version("1.1");
  script_set_attribute(attribute:"plugin_modification_date", value:"2026/10/25");

  script_cve_id(
    "CVE-2026-19630",
    "CVE-2026-19668",
    "CVE-2026-77119",
    "CVE-2026-94300",
    "CVE-2026-96888",
    "CVE-2026-97313"
  );
  script_xref(name:"IAVA", value:"2026-A-1029-S");
  script_xref(name:"IAVA", value:"2026-A-1197");

  script_name(english:"Amazon Linux 2023 : bind, bind-chroot, bind-devel (ALAS2023-2026-3312)");

  script_set_attribute(attribute:"synopsis", value:
"The remote Amazon Linux 2023 host is missing a security update.");
  script_set_attribute(attribute:"description", value:
"It is, therefore, affected by multiple vulnerabilities as referenced in the ALAS2023-2026-3312 advisory.

    Inbound-message resource exhaustion (CWE-400) leading to denial of service. No configuration precondition;
    version applicability is the deciding factor. Affected versions: 9.11.0-9.18.50, 9.20.0-9.20.29,
    9.21.0-9.21.26. (CVE-2026-19630)

    A BIND recursive resolver may experience excessive resource consumption if it encounters large numbers of
    a particular kind of invalid DNSSEC record.  Default limits on max-records-per-type and max-types-per-
    name help mitigate the exposure.This issue affects BIND 9 versions 9.11.0 through 9.18.50, 9.20.0 through
    9.20.27, 9.21.0 through 9.21.25, 9.11.3-S1 through 9.18.50-S1, and 9.20.9-S1 through 9.20.27-S1.
    (CVE-2026-19668)

    A validly signed NSEC3 from an unrelated sibling zone may be accepted as an insecurity proof, downgrading
    a secure delegation and letting a forged unsigned answer through.This issue affects BIND 9 versions 9.11.0
    through 9.18.50, 9.20.0 through 9.20.27, 9.21.0 through 9.21.25, 9.11.3-S1 through 9.18.50-S1, and
    9.20.9-S1 through 9.20.27-S1. (CVE-2026-77119)

    Replaying GSS-TSIG signed UDP messages can result in memory corruption in named. An attacker who can
    capture a previously signed UDP message can replay it while the negotiated TSIG key is still valid. By
    also sending crafted queries to a zone the attacker controls, the attacker may potentially achieve remote
    code execution. (CVE-2026-94300)

    Named may terminate unexpectedly when a redirect zone is used with strict QNAME minimization (CWE-617). A
    resolver is only affected when configured with both a redirect zone AND qname-minimization strict.
    Affected versions: 9.16.0-9.18.50, 9.20.0-9.20.29, 9.21.0-9.21.26. (CVE-2026-96888)

    Named exits on an assertion failure, resulting in denial of service. Affected versions: 9.16.0-9.18.50,
    9.20.0-9.20.29. (CVE-2026-97313)

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//AL2023/ALAS2023-2026-3312.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-2026-19630.html");
  script_set_attribute(attribute:"see_also", value:"https://explore.alas.aws.amazon.com/CVE-2026-19668.html");
  script_set_attribute(attribute:"see_also", value:"https://explore.alas.aws.amazon.com/CVE-2026-77119.html");
  script_set_attribute(attribute:"see_also", value:"https://explore.alas.aws.amazon.com/CVE-2026-94300.html");
  script_set_attribute(attribute:"see_also", value:"https://explore.alas.aws.amazon.com/CVE-2026-96888.html");
  script_set_attribute(attribute:"see_also", value:"https://explore.alas.aws.amazon.com/CVE-2026-97313.html");
  script_set_attribute(attribute:"solution", value:
"Run 'dnf update bind --releasever 2023.12.20261026' or
  or 'dnf update --advisory ALAS2023-2026-3312 --releasever 2023.12.20261026' to update your system.");
  script_set_cvss_base_vector("CVSS2#AV:N/AC:H/Au:N/C:C/I:C/A:C");
  script_set_cvss_temporal_vector("CVSS2#E:POC/RL:OF/RC:C");
  script_set_cvss3_base_vector("CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H");
  script_set_cvss3_temporal_vector("CVSS:3.0/E:P/RL:O/RC:C");
  script_set_attribute(attribute:"cvss_score_source", value:"CVE-2026-94300");

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

  script_set_attribute(attribute:"vuln_publication_date", value:"2026/09/16");
  script_set_attribute(attribute:"patch_publication_date", value:"2026/10/24");
  script_set_attribute(attribute:"plugin_publication_date", value:"2026/10/25");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:bind");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:bind-chroot");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:bind-debuginfo");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:bind-debugsource");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:bind-devel");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:bind-dnssec-utils");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:bind-dnssec-utils-debuginfo");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:bind-doc");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:bind-libs");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:bind-libs-debuginfo");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:bind-license");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:bind-utils");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:bind-utils-debuginfo");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:amazon:linux:2023");
  script_set_attribute(attribute:"generated_plugin", value:"current");
  script_set_attribute(attribute:"stig_severity", value:"I");
  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_info2.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 != "-2023")
{
  if (os_ver == 'A') os_ver = 'AMI';
  audit(AUDIT_OS_NOT, "Amazon Linux 2023", "Amazon Linux " + os_ver);
}

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

var pkgs = [
    {'reference':'bind-9.18.50-1.amzn2023.0.5', 'cpu':'aarch64', 'release':'AL-2023', 'rpm_spec_vers_cmp':TRUE},
    {'reference':'bind-9.18.50-1.amzn2023.0.5', 'cpu':'x86_64', 'release':'AL-2023', 'rpm_spec_vers_cmp':TRUE},
    {'reference':'bind-chroot-9.18.50-1.amzn2023.0.5', 'cpu':'aarch64', 'release':'AL-2023', 'rpm_spec_vers_cmp':TRUE},
    {'reference':'bind-chroot-9.18.50-1.amzn2023.0.5', 'cpu':'x86_64', 'release':'AL-2023', 'rpm_spec_vers_cmp':TRUE},
    {'reference':'bind-debuginfo-9.18.50-1.amzn2023.0.5', 'cpu':'aarch64', 'release':'AL-2023', 'rpm_spec_vers_cmp':TRUE},
    {'reference':'bind-debuginfo-9.18.50-1.amzn2023.0.5', 'cpu':'x86_64', 'release':'AL-2023', 'rpm_spec_vers_cmp':TRUE},
    {'reference':'bind-debugsource-9.18.50-1.amzn2023.0.5', 'cpu':'aarch64', 'release':'AL-2023', 'rpm_spec_vers_cmp':TRUE},
    {'reference':'bind-debugsource-9.18.50-1.amzn2023.0.5', 'cpu':'x86_64', 'release':'AL-2023', 'rpm_spec_vers_cmp':TRUE},
    {'reference':'bind-devel-9.18.50-1.amzn2023.0.5', 'cpu':'aarch64', 'release':'AL-2023', 'rpm_spec_vers_cmp':TRUE},
    {'reference':'bind-devel-9.18.50-1.amzn2023.0.5', 'cpu':'x86_64', 'release':'AL-2023', 'rpm_spec_vers_cmp':TRUE},
    {'reference':'bind-dnssec-utils-9.18.50-1.amzn2023.0.5', 'cpu':'aarch64', 'release':'AL-2023', 'rpm_spec_vers_cmp':TRUE},
    {'reference':'bind-dnssec-utils-9.18.50-1.amzn2023.0.5', 'cpu':'x86_64', 'release':'AL-2023', 'rpm_spec_vers_cmp':TRUE},
    {'reference':'bind-dnssec-utils-debuginfo-9.18.50-1.amzn2023.0.5', 'cpu':'aarch64', 'release':'AL-2023', 'rpm_spec_vers_cmp':TRUE},
    {'reference':'bind-dnssec-utils-debuginfo-9.18.50-1.amzn2023.0.5', 'cpu':'x86_64', 'release':'AL-2023', 'rpm_spec_vers_cmp':TRUE},
    {'reference':'bind-doc-9.18.50-1.amzn2023.0.5', 'release':'AL-2023', 'rpm_spec_vers_cmp':TRUE},
    {'reference':'bind-libs-9.18.50-1.amzn2023.0.5', 'cpu':'aarch64', 'release':'AL-2023', 'rpm_spec_vers_cmp':TRUE},
    {'reference':'bind-libs-9.18.50-1.amzn2023.0.5', 'cpu':'x86_64', 'release':'AL-2023', 'rpm_spec_vers_cmp':TRUE},
    {'reference':'bind-libs-debuginfo-9.18.50-1.amzn2023.0.5', 'cpu':'aarch64', 'release':'AL-2023', 'rpm_spec_vers_cmp':TRUE},
    {'reference':'bind-libs-debuginfo-9.18.50-1.amzn2023.0.5', 'cpu':'x86_64', 'release':'AL-2023', 'rpm_spec_vers_cmp':TRUE},
    {'reference':'bind-license-9.18.50-1.amzn2023.0.5', 'release':'AL-2023', 'rpm_spec_vers_cmp':TRUE},
    {'reference':'bind-utils-9.18.50-1.amzn2023.0.5', 'cpu':'aarch64', 'release':'AL-2023', 'rpm_spec_vers_cmp':TRUE},
    {'reference':'bind-utils-9.18.50-1.amzn2023.0.5', 'cpu':'x86_64', 'release':'AL-2023', 'rpm_spec_vers_cmp':TRUE},
    {'reference':'bind-utils-debuginfo-9.18.50-1.amzn2023.0.5', 'cpu':'aarch64', 'release':'AL-2023', 'rpm_spec_vers_cmp':TRUE},
    {'reference':'bind-utils-debuginfo-9.18.50-1.amzn2023.0.5', 'cpu':'x86_64', 'release':'AL-2023', '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, "bind / bind-chroot / bind-debuginfo / etc");
}