Amazon Linux 2 : bind (ALAS-2025-2729)

#%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-2025-2729.
##

include('compat.inc');

if (description)
{
  script_id(213674);
  script_version("1.1");
  script_set_attribute(attribute:"plugin_modification_date", value:"2025/01/09");

  script_cve_id("CVE-2022-3094");
  script_xref(name:"IAVA", value:"2023-A-0058-S");

  script_name(english:"Amazon Linux 2 : bind (ALAS-2025-2729)");

  script_set_attribute(attribute:"synopsis", value:
"The remote Amazon Linux 2 host is missing a security update.");
  script_set_attribute(attribute:"description", value:
"The version of bind installed on the remote host is prior to 9.11.4-26.P2. It is, therefore, affected by a vulnerability
as referenced in the ALAS2-2025-2729 advisory.

    Sending a flood of dynamic DNS updates may cause `named` to allocate large amounts of memory. This, in
    turn, may cause `named` to exit due to a lack of free memory. We are not aware of any cases where this has
    been exploited.

    Memory is allocated prior to the checking of access permissions (ACLs) and is retained during the
    processing of a dynamic update from a client whose access credentials are accepted. Memory allocated to
    clients that are not permitted to send updates is released immediately upon rejection. The scope of this
    vulnerability is limited therefore to trusted clients who are permitted to make dynamic zone changes.

    If a dynamic update is REFUSED, memory will be released again very quickly. Therefore it is only likely to
    be possible to degrade or stop `named` by sending a flood of unaccepted dynamic updates comparable in
    magnitude to a query flood intended to achieve the same detrimental outcome.

    BIND 9.11 and earlier branches are also affected, but through exhaustion of internal resources rather than
    memory constraints. This may reduce performance but should not be a significant problem for most servers.
    Therefore we don't intend to address this for BIND versions prior to BIND 9.16.This issue affects BIND 9
    versions 9.16.0 through 9.16.36, 9.18.0 through 9.18.10, 9.19.0 through 9.19.8, and 9.16.8-S1 through
    9.16.36-S1. (CVE-2022-3094)

Tenable has extracted the preceding description block directly from the tested product security advisory.

Note that Nessus has not tested for this issue 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/ALAS-2025-2729.html");
  script_set_attribute(attribute:"see_also", value:"https://alas.aws.amazon.com/cve/html/CVE-2022-3094.html");
  script_set_attribute(attribute:"see_also", value:"https://alas.aws.amazon.com/faqs.html");
  script_set_attribute(attribute:"solution", value:
"Run 'yum update bind' to update your system.");
  script_set_cvss_base_vector("CVSS2#AV:N/AC:L/Au:N/C:N/I:N/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:N/I:N/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-2022-3094");

  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:"2023/01/25");
  script_set_attribute(attribute:"patch_publication_date", value:"2025/01/04");
  script_set_attribute(attribute:"plugin_publication_date", value:"2025/01/09");

  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-devel");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:bind-export-devel");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:bind-export-libs");
  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-lite");
  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-lite-devel");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:bind-pkcs11");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:bind-pkcs11-devel");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:bind-pkcs11-libs");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:bind-pkcs11-utils");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:bind-sdb");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:bind-sdb-chroot");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:bind-utils");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:amazon:linux:2");
  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) 2025 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("rpm.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':'bind-9.11.4-26.P2.amzn2.13.9', 'cpu':'aarch64', 'release':'AL2', 'rpm_spec_vers_cmp':TRUE},
    {'reference':'bind-9.11.4-26.P2.amzn2.13.9', 'cpu':'i686', 'release':'AL2', 'rpm_spec_vers_cmp':TRUE},
    {'reference':'bind-9.11.4-26.P2.amzn2.13.9', 'cpu':'x86_64', 'release':'AL2', 'rpm_spec_vers_cmp':TRUE},
    {'reference':'bind-chroot-9.11.4-26.P2.amzn2.13.9', 'cpu':'aarch64', 'release':'AL2', 'rpm_spec_vers_cmp':TRUE},
    {'reference':'bind-chroot-9.11.4-26.P2.amzn2.13.9', 'cpu':'i686', 'release':'AL2', 'rpm_spec_vers_cmp':TRUE},
    {'reference':'bind-chroot-9.11.4-26.P2.amzn2.13.9', 'cpu':'x86_64', 'release':'AL2', 'rpm_spec_vers_cmp':TRUE},
    {'reference':'bind-debuginfo-9.11.4-26.P2.amzn2.13.9', 'cpu':'aarch64', 'release':'AL2', 'rpm_spec_vers_cmp':TRUE},
    {'reference':'bind-debuginfo-9.11.4-26.P2.amzn2.13.9', 'cpu':'i686', 'release':'AL2', 'rpm_spec_vers_cmp':TRUE},
    {'reference':'bind-debuginfo-9.11.4-26.P2.amzn2.13.9', 'cpu':'x86_64', 'release':'AL2', 'rpm_spec_vers_cmp':TRUE},
    {'reference':'bind-devel-9.11.4-26.P2.amzn2.13.9', 'cpu':'aarch64', 'release':'AL2', 'rpm_spec_vers_cmp':TRUE},
    {'reference':'bind-devel-9.11.4-26.P2.amzn2.13.9', 'cpu':'i686', 'release':'AL2', 'rpm_spec_vers_cmp':TRUE},
    {'reference':'bind-devel-9.11.4-26.P2.amzn2.13.9', 'cpu':'x86_64', 'release':'AL2', 'rpm_spec_vers_cmp':TRUE},
    {'reference':'bind-export-devel-9.11.4-26.P2.amzn2.13.9', 'cpu':'aarch64', 'release':'AL2', 'rpm_spec_vers_cmp':TRUE},
    {'reference':'bind-export-devel-9.11.4-26.P2.amzn2.13.9', 'cpu':'i686', 'release':'AL2', 'rpm_spec_vers_cmp':TRUE},
    {'reference':'bind-export-devel-9.11.4-26.P2.amzn2.13.9', 'cpu':'x86_64', 'release':'AL2', 'rpm_spec_vers_cmp':TRUE},
    {'reference':'bind-export-libs-9.11.4-26.P2.amzn2.13.9', 'cpu':'aarch64', 'release':'AL2', 'rpm_spec_vers_cmp':TRUE},
    {'reference':'bind-export-libs-9.11.4-26.P2.amzn2.13.9', 'cpu':'i686', 'release':'AL2', 'rpm_spec_vers_cmp':TRUE},
    {'reference':'bind-export-libs-9.11.4-26.P2.amzn2.13.9', 'cpu':'x86_64', 'release':'AL2', 'rpm_spec_vers_cmp':TRUE},
    {'reference':'bind-libs-9.11.4-26.P2.amzn2.13.9', 'cpu':'aarch64', 'release':'AL2', 'rpm_spec_vers_cmp':TRUE},
    {'reference':'bind-libs-9.11.4-26.P2.amzn2.13.9', 'cpu':'i686', 'release':'AL2', 'rpm_spec_vers_cmp':TRUE},
    {'reference':'bind-libs-9.11.4-26.P2.amzn2.13.9', 'cpu':'x86_64', 'release':'AL2', 'rpm_spec_vers_cmp':TRUE},
    {'reference':'bind-libs-lite-9.11.4-26.P2.amzn2.13.9', 'cpu':'aarch64', 'release':'AL2', 'rpm_spec_vers_cmp':TRUE},
    {'reference':'bind-libs-lite-9.11.4-26.P2.amzn2.13.9', 'cpu':'i686', 'release':'AL2', 'rpm_spec_vers_cmp':TRUE},
    {'reference':'bind-libs-lite-9.11.4-26.P2.amzn2.13.9', 'cpu':'x86_64', 'release':'AL2', 'rpm_spec_vers_cmp':TRUE},
    {'reference':'bind-license-9.11.4-26.P2.amzn2.13.9', 'release':'AL2', 'rpm_spec_vers_cmp':TRUE},
    {'reference':'bind-lite-devel-9.11.4-26.P2.amzn2.13.9', 'cpu':'aarch64', 'release':'AL2', 'rpm_spec_vers_cmp':TRUE},
    {'reference':'bind-lite-devel-9.11.4-26.P2.amzn2.13.9', 'cpu':'i686', 'release':'AL2', 'rpm_spec_vers_cmp':TRUE},
    {'reference':'bind-lite-devel-9.11.4-26.P2.amzn2.13.9', 'cpu':'x86_64', 'release':'AL2', 'rpm_spec_vers_cmp':TRUE},
    {'reference':'bind-pkcs11-9.11.4-26.P2.amzn2.13.9', 'cpu':'aarch64', 'release':'AL2', 'rpm_spec_vers_cmp':TRUE},
    {'reference':'bind-pkcs11-9.11.4-26.P2.amzn2.13.9', 'cpu':'i686', 'release':'AL2', 'rpm_spec_vers_cmp':TRUE},
    {'reference':'bind-pkcs11-9.11.4-26.P2.amzn2.13.9', 'cpu':'x86_64', 'release':'AL2', 'rpm_spec_vers_cmp':TRUE},
    {'reference':'bind-pkcs11-devel-9.11.4-26.P2.amzn2.13.9', 'cpu':'aarch64', 'release':'AL2', 'rpm_spec_vers_cmp':TRUE},
    {'reference':'bind-pkcs11-devel-9.11.4-26.P2.amzn2.13.9', 'cpu':'i686', 'release':'AL2', 'rpm_spec_vers_cmp':TRUE},
    {'reference':'bind-pkcs11-devel-9.11.4-26.P2.amzn2.13.9', 'cpu':'x86_64', 'release':'AL2', 'rpm_spec_vers_cmp':TRUE},
    {'reference':'bind-pkcs11-libs-9.11.4-26.P2.amzn2.13.9', 'cpu':'aarch64', 'release':'AL2', 'rpm_spec_vers_cmp':TRUE},
    {'reference':'bind-pkcs11-libs-9.11.4-26.P2.amzn2.13.9', 'cpu':'i686', 'release':'AL2', 'rpm_spec_vers_cmp':TRUE},
    {'reference':'bind-pkcs11-libs-9.11.4-26.P2.amzn2.13.9', 'cpu':'x86_64', 'release':'AL2', 'rpm_spec_vers_cmp':TRUE},
    {'reference':'bind-pkcs11-utils-9.11.4-26.P2.amzn2.13.9', 'cpu':'aarch64', 'release':'AL2', 'rpm_spec_vers_cmp':TRUE},
    {'reference':'bind-pkcs11-utils-9.11.4-26.P2.amzn2.13.9', 'cpu':'i686', 'release':'AL2', 'rpm_spec_vers_cmp':TRUE},
    {'reference':'bind-pkcs11-utils-9.11.4-26.P2.amzn2.13.9', 'cpu':'x86_64', 'release':'AL2', 'rpm_spec_vers_cmp':TRUE},
    {'reference':'bind-sdb-9.11.4-26.P2.amzn2.13.9', 'cpu':'aarch64', 'release':'AL2', 'rpm_spec_vers_cmp':TRUE},
    {'reference':'bind-sdb-9.11.4-26.P2.amzn2.13.9', 'cpu':'i686', 'release':'AL2', 'rpm_spec_vers_cmp':TRUE},
    {'reference':'bind-sdb-9.11.4-26.P2.amzn2.13.9', 'cpu':'x86_64', 'release':'AL2', 'rpm_spec_vers_cmp':TRUE},
    {'reference':'bind-sdb-chroot-9.11.4-26.P2.amzn2.13.9', 'cpu':'aarch64', 'release':'AL2', 'rpm_spec_vers_cmp':TRUE},
    {'reference':'bind-sdb-chroot-9.11.4-26.P2.amzn2.13.9', 'cpu':'i686', 'release':'AL2', 'rpm_spec_vers_cmp':TRUE},
    {'reference':'bind-sdb-chroot-9.11.4-26.P2.amzn2.13.9', 'cpu':'x86_64', 'release':'AL2', 'rpm_spec_vers_cmp':TRUE},
    {'reference':'bind-utils-9.11.4-26.P2.amzn2.13.9', 'cpu':'aarch64', 'release':'AL2', 'rpm_spec_vers_cmp':TRUE},
    {'reference':'bind-utils-9.11.4-26.P2.amzn2.13.9', 'cpu':'i686', 'release':'AL2', 'rpm_spec_vers_cmp':TRUE},
    {'reference':'bind-utils-9.11.4-26.P2.amzn2.13.9', 'cpu':'x86_64', '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, "bind / bind-chroot / bind-debuginfo / etc");
}