AlmaLinux 8 : bind and dhcp (ALSA-2024:1782)

#%NASL_MIN_LEVEL 80900
##
# (C) Tenable, Inc.
#
# The package checks in this plugin were extracted from
# AlmaLinux Security Advisory ALSA-2024:1782.
##

include('compat.inc');

if (description)
{
  script_id(193277);
  script_version("1.0");
  script_set_attribute(attribute:"plugin_modification_date", value:"2024/04/12");

  script_cve_id("CVE-2023-4408", "CVE-2023-50387", "CVE-2023-50868");
  script_xref(name:"ALSA", value:"2024:1782");
  script_xref(name:"IAVA", value:"2024-A-0103");

  script_name(english:"AlmaLinux 8 : bind and dhcp (ALSA-2024:1782)");

  script_set_attribute(attribute:"synopsis", value:
"The remote AlmaLinux host is missing one or more security updates.");
  script_set_attribute(attribute:"description", value:
"The remote AlmaLinux 8 host has packages installed that are affected by multiple vulnerabilities as referenced in the
ALSA-2024:1782 advisory.

  - The DNS message parsing code in `named` includes a section whose computational complexity is overly high.
    It does not cause problems for typical DNS traffic, but crafted queries and responses may cause excessive
    CPU load on the affected `named` instance by exploiting this flaw. This issue affects both authoritative
    servers and recursive resolvers. This issue affects BIND 9 versions 9.0.0 through 9.16.45, 9.18.0 through
    9.18.21, 9.19.0 through 9.19.19, 9.9.3-S1 through 9.11.37-S1, 9.16.8-S1 through 9.16.45-S1, and 9.18.11-S1
    through 9.18.21-S1. (CVE-2023-4408)

  - Certain DNSSEC aspects of the DNS protocol (in RFC 4033, 4034, 4035, 6840, and related RFCs) allow remote
    attackers to cause a denial of service (CPU consumption) via one or more DNSSEC responses, aka the
    KeyTrap issue. One of the concerns is that, when there is a zone with many DNSKEY and RRSIG records, the
    protocol specification implies that an algorithm must evaluate all combinations of DNSKEY and RRSIG
    records. (CVE-2023-50387)

  - The Closest Encloser Proof aspect of the DNS protocol (in RFC 5155 when RFC 9276 guidance is skipped)
    allows remote attackers to cause a denial of service (CPU consumption for SHA-1 computations) via DNSSEC
    responses in a random subdomain attack, aka the NSEC3 issue. The RFC 5155 specification implies that an
    algorithm must perform thousands of iterations of a hash function in certain situations. (CVE-2023-50868)

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://errata.almalinux.org/8/ALSA-2024-1782.html");
  script_set_attribute(attribute:"solution", value:
"Update the affected packages.");
  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-2023-50387");

  script_set_attribute(attribute:"exploitability_ease", value:"No known exploits are available");
  script_set_attribute(attribute:"exploit_available", value:"false");
  script_cwe_id(400);

  script_set_attribute(attribute:"vuln_publication_date", value:"2024/02/13");
  script_set_attribute(attribute:"patch_publication_date", value:"2024/04/12");
  script_set_attribute(attribute:"plugin_publication_date", value:"2024/04/12");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:alma:linux:bind");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:alma:linux:bind-chroot");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:alma:linux:bind-devel");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:alma:linux:bind-export-devel");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:alma:linux:bind-export-libs");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:alma:linux:bind-libs");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:alma:linux:bind-libs-lite");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:alma:linux:bind-license");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:alma:linux:bind-lite-devel");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:alma:linux:bind-pkcs11");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:alma:linux:bind-pkcs11-devel");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:alma:linux:bind-pkcs11-libs");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:alma:linux:bind-pkcs11-utils");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:alma:linux:bind-sdb");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:alma:linux:bind-sdb-chroot");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:alma:linux:bind-utils");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:alma:linux:python3-bind");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:alma:linux:8");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:alma:linux:8::appstream");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:alma:linux:8::baseos");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:alma:linux:8::highavailability");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:alma:linux:8::nfv");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:alma:linux:8::powertools");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:alma:linux:8::realtime");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:alma:linux:8::resilientstorage");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:alma:linux:8::sap");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:alma:linux:8::sap_hana");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:alma:linux:8::supplementary");
  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:"Alma Linux Local Security Checks");

  script_copyright(english:"This script is Copyright (C) 2024 and is owned by Tenable, Inc. or an Affiliate thereof.");

  script_dependencies("ssh_get_info.nasl");
  script_require_keys("Host/local_checks_enabled", "Host/AlmaLinux/release", "Host/AlmaLinux/rpm-list", "Host/cpu");

  exit(0);
}


include('rpm.inc');

if (!get_kb_item('Host/local_checks_enabled')) audit(AUDIT_LOCAL_CHECKS_NOT_ENABLED);
var os_release = get_kb_item('Host/AlmaLinux/release');
if (isnull(os_release) || 'AlmaLinux' >!< os_release) audit(AUDIT_OS_NOT, 'AlmaLinux');
var os_ver = pregmatch(pattern: "AlmaLinux release ([0-9]+(\.[0-9]+)?)", string:os_release);
if (isnull(os_ver)) audit(AUDIT_UNKNOWN_APP_VER, 'AlmaLinux');
os_ver = os_ver[1];
if (! preg(pattern:"^8([^0-9]|$)", string:os_ver)) audit(AUDIT_OS_NOT, 'AlmaLinux 8.x', 'AlmaLinux ' + os_ver);

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 ('x86_64' >!< cpu && cpu !~ "^i[3-6]86$" && 's390' >!< cpu && 'aarch64' >!< cpu) audit(AUDIT_LOCAL_CHECKS_NOT_IMPLEMENTED, 'AlmaLinux', cpu);

var pkgs = [
    {'reference':'bind-9.11.36-11.el8_9.1', 'release':'8', 'rpm_spec_vers_cmp':TRUE, 'epoch':'32'},
    {'reference':'bind-chroot-9.11.36-11.el8_9.1', 'release':'8', 'rpm_spec_vers_cmp':TRUE, 'epoch':'32'},
    {'reference':'bind-devel-9.11.36-11.el8_9.1', 'release':'8', 'rpm_spec_vers_cmp':TRUE, 'epoch':'32'},
    {'reference':'bind-export-devel-9.11.36-11.el8_9.1', 'release':'8', 'rpm_spec_vers_cmp':TRUE, 'epoch':'32'},
    {'reference':'bind-export-libs-9.11.36-11.el8_9.1', 'release':'8', 'rpm_spec_vers_cmp':TRUE, 'epoch':'32'},
    {'reference':'bind-libs-9.11.36-11.el8_9.1', 'release':'8', 'rpm_spec_vers_cmp':TRUE, 'epoch':'32'},
    {'reference':'bind-libs-lite-9.11.36-11.el8_9.1', 'release':'8', 'rpm_spec_vers_cmp':TRUE, 'epoch':'32'},
    {'reference':'bind-license-9.11.36-11.el8_9.1', 'release':'8', 'rpm_spec_vers_cmp':TRUE, 'epoch':'32'},
    {'reference':'bind-lite-devel-9.11.36-11.el8_9.1', 'release':'8', 'rpm_spec_vers_cmp':TRUE, 'epoch':'32'},
    {'reference':'bind-pkcs11-9.11.36-11.el8_9.1', 'release':'8', 'rpm_spec_vers_cmp':TRUE, 'epoch':'32'},
    {'reference':'bind-pkcs11-devel-9.11.36-11.el8_9.1', 'release':'8', 'rpm_spec_vers_cmp':TRUE, 'epoch':'32'},
    {'reference':'bind-pkcs11-libs-9.11.36-11.el8_9.1', 'release':'8', 'rpm_spec_vers_cmp':TRUE, 'epoch':'32'},
    {'reference':'bind-pkcs11-utils-9.11.36-11.el8_9.1', 'release':'8', 'rpm_spec_vers_cmp':TRUE, 'epoch':'32'},
    {'reference':'bind-sdb-9.11.36-11.el8_9.1', 'release':'8', 'rpm_spec_vers_cmp':TRUE, 'epoch':'32'},
    {'reference':'bind-sdb-chroot-9.11.36-11.el8_9.1', 'release':'8', 'rpm_spec_vers_cmp':TRUE, 'epoch':'32'},
    {'reference':'bind-utils-9.11.36-11.el8_9.1', 'release':'8', 'rpm_spec_vers_cmp':TRUE, 'epoch':'32'},
    {'reference':'python3-bind-9.11.36-11.el8_9.1', 'release':'8', 'rpm_spec_vers_cmp':TRUE, 'epoch':'32'}
];

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;
  if (!empty_or_null(package_array['reference'])) reference = package_array['reference'];
  if (!empty_or_null(package_array['release'])) _release = 'Alma-' + 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 (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)) 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-devel / bind-export-devel / etc');
}