F5 Networks BIG-IP : BIND vulnerability (K77326807)

#%NASL_MIN_LEVEL 70300
##
# (C) Tenable Network Security, Inc.
#
# The descriptive text and package checks in this plugin were
# extracted from F5 Networks BIG-IP Solution K77326807.
#
# @NOAGENT@
##

include('deprecated_nasl_level.inc');
include('compat.inc');

if (description)
{
  script_id(154968);
  script_version("1.6");
  script_set_attribute(attribute:"plugin_modification_date", value:"2026/02/09");

  script_cve_id("CVE-2021-25219");
  script_xref(name:"IAVA", value:"2021-A-0525-S");

  script_name(english:"F5 Networks BIG-IP : BIND vulnerability (K77326807)");

  script_set_attribute(attribute:"synopsis", value:
"The remote device is missing a vendor-supplied security patch.");
  script_set_attribute(attribute:"description", value:
"The version of F5 Networks BIG-IP installed on the remote host is prior to 13.1.5 / 14.1.5 / 15.1.6 / 16.1.3 / 17.0.0.
It is, therefore, affected by a vulnerability as referenced in the K77326807 advisory.

    In BIND 9.3.0 -> 9.11.35, 9.12.0 -> 9.16.21, and versions 9.9.3-S1 -> 9.11.35-S1 and 9.16.8-S1 ->
    9.16.21-S1 of BIND Supported Preview Edition, as well as release versions 9.17.0 -> 9.17.18 of the BIND
    9.17 development branch, exploitation of broken authoritative servers using a flaw in response processing
    can cause degradation in BIND resolver performance. The way the lame cache is currently designed makes it
    possible for its internal data structures to grow almost infinitely, which may cause significant delays in
    client query processing.(CVE-2021-25219)ImpactThis vulnerabilitycould be abused by an attacker to
    significantly degrade resolver performance.BIG-IPThe BIG-IP system is affected only when theUse BIND
    Server on BIG-IPfeature is enabled in the DNS profile. To verify, go toLocal Traffic>Profiles>Services,
    and select the affected DNS profile.

Tenable has extracted the preceding description block directly from the F5 Networks BIG-IP 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://my.f5.com/manage/s/article/K77326807");
  script_set_attribute(attribute:"solution", value:
"Upgrade to one of the non-vulnerable versions listed in the F5 Solution K77326807.");
  script_set_cvss_base_vector("CVSS2#AV:N/AC:L/Au:N/C:N/I:N/A:P");
  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:L");
  script_set_cvss3_temporal_vector("CVSS:3.0/E:U/RL:O/RC:C");
  script_set_attribute(attribute:"cvss_score_source", value:"CVE-2021-25219");

  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:"2021/10/27");
  script_set_attribute(attribute:"patch_publication_date", value:"2021/11/08");
  script_set_attribute(attribute:"plugin_publication_date", value:"2021/11/09");

  script_set_attribute(attribute:"potential_vulnerability", value:"true");
  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"cpe:/a:f5:big-ip_access_policy_manager");
  script_set_attribute(attribute:"cpe", value:"cpe:/a:f5:big-ip_advanced_firewall_manager");
  script_set_attribute(attribute:"cpe", value:"cpe:/a:f5:big-ip_application_security_manager");
  script_set_attribute(attribute:"cpe", value:"cpe:/a:f5:big-ip_domain_name_system");
  script_set_attribute(attribute:"cpe", value:"cpe:/a:f5:big-ip_global_traffic_manager");
  script_set_attribute(attribute:"cpe", value:"cpe:/a:f5:big-ip_iapps_lx");
  script_set_attribute(attribute:"cpe", value:"cpe:/a:f5:big-ip_irules_lx");
  script_set_attribute(attribute:"cpe", value:"cpe:/a:f5:big-ip_local_traffic_manager");
  script_set_attribute(attribute:"cpe", value:"cpe:/a:f5:big-ip_policy_enforcement_manager");
  script_set_attribute(attribute:"cpe", value:"cpe:/a:f5:big-ip_ssl_orchestrator");
  script_set_attribute(attribute:"cpe", value:"cpe:/a:f5:big-ip_wan_optimization_manager");
  script_set_attribute(attribute:"cpe", value:"cpe:/h:f5:big-ip_protocol_security_manager");
  script_set_attribute(attribute:"cpe", value:"cpe:/h:f5:big-ip");
  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:"F5 Networks Local Security Checks");

  script_copyright(english:"This script is Copyright (C) 2021-2026 and is owned by Tenable, Inc. or an Affiliate thereof.");

  script_dependencies("f5_bigip_detect.nbin");
  script_require_keys("Host/local_checks_enabled", "Host/BIG-IP/hotfix", "Host/BIG-IP/modules", "Host/BIG-IP/version", "Settings/ParanoidReport");

  exit(0);
}


include('f5_func.inc');

if ( ! get_kb_item('Host/local_checks_enabled') ) audit(AUDIT_LOCAL_CHECKS_NOT_ENABLED);
var version = get_kb_item('Host/BIG-IP/version');
if ( ! version ) audit(AUDIT_OS_NOT, 'F5 Networks BIG-IP');
if ( isnull(get_kb_item('Host/BIG-IP/hotfix')) ) audit(AUDIT_KB_MISSING, 'Host/BIG-IP/hotfix');
if ( ! get_kb_item('Host/BIG-IP/modules') ) audit(AUDIT_KB_MISSING, 'Host/BIG-IP/modules');

if (report_paranoia < 2) audit(AUDIT_PARANOID);

var sol = 'K77326807';
var vmatrix = {
  'AFM': {
    'affected': [
      '16.1.0-16.1.2','15.1.0-15.1.5','14.1.0-14.1.4','13.1.0-13.1.4','12.1.0-12.1.6','11.6.1-11.6.5'
    ],
    'unaffected': [
      '17.0.0','16.1.3','15.1.6','14.1.5','13.1.5'
    ],
  },
  'APM': {
    'affected': [
      '16.1.0-16.1.2','15.1.0-15.1.5','14.1.0-14.1.4','13.1.0-13.1.4','12.1.0-12.1.6','11.6.1-11.6.5'
    ],
    'unaffected': [
      '17.0.0','16.1.3','15.1.6','14.1.5','13.1.5'
    ],
  },
  'ASM': {
    'affected': [
      '16.1.0-16.1.2','15.1.0-15.1.5','14.1.0-14.1.4','13.1.0-13.1.4','12.1.0-12.1.6','11.6.1-11.6.5'
    ],
    'unaffected': [
      '17.0.0','16.1.3','15.1.6','14.1.5','13.1.5'
    ],
  },
  'DNS': {
    'affected': [
      '16.1.0-16.1.2','15.1.0-15.1.5','14.1.0-14.1.4','13.1.0-13.1.4','12.1.0-12.1.6','11.6.1-11.6.5'
    ],
    'unaffected': [
      '17.0.0','16.1.3','15.1.6','14.1.5','13.1.5'
    ],
  },
  'GTM': {
    'affected': [
      '16.1.0-16.1.2','15.1.0-15.1.5','14.1.0-14.1.4','13.1.0-13.1.4','12.1.0-12.1.6','11.6.1-11.6.5'
    ],
    'unaffected': [
      '17.0.0','16.1.3','15.1.6','14.1.5','13.1.5'
    ],
  },
  'LTM': {
    'affected': [
      '16.1.0-16.1.2','15.1.0-15.1.5','14.1.0-14.1.4','13.1.0-13.1.4','12.1.0-12.1.6','11.6.1-11.6.5'
    ],
    'unaffected': [
      '17.0.0','16.1.3','15.1.6','14.1.5','13.1.5'
    ],
  },
  'PEM': {
    'affected': [
      '16.1.0-16.1.2','15.1.0-15.1.5','14.1.0-14.1.4','13.1.0-13.1.4','12.1.0-12.1.6','11.6.1-11.6.5'
    ],
    'unaffected': [
      '17.0.0','16.1.3','15.1.6','14.1.5','13.1.5'
    ],
  },
  'PSM': {
    'affected': [
      '16.1.0-16.1.2','15.1.0-15.1.5','14.1.0-14.1.4','13.1.0-13.1.4','12.1.0-12.1.6','11.6.1-11.6.5'
    ],
    'unaffected': [
      '17.0.0','16.1.3','15.1.6','14.1.5','13.1.5'
    ],
  },
  'SSL-Orchestrator': {
    'affected': [
      '16.1.0-16.1.2','15.1.0-15.1.5','14.1.0-14.1.4','13.1.0-13.1.4','12.1.0-12.1.6','11.6.1-11.6.5'
    ],
    'unaffected': [
      '17.0.0','16.1.3','15.1.6','14.1.5','13.1.5'
    ],
  },
  'WOM': {
    'affected': [
      '16.1.0-16.1.2','15.1.0-15.1.5','14.1.0-14.1.4','13.1.0-13.1.4','12.1.0-12.1.6','11.6.1-11.6.5'
    ],
    'unaffected': [
      '17.0.0','16.1.3','15.1.6','14.1.5','13.1.5'
    ],
  },
  'iAppsLX': {
    'affected': [
      '16.1.0-16.1.2','15.1.0-15.1.5','14.1.0-14.1.4','13.1.0-13.1.4','12.1.0-12.1.6','11.6.1-11.6.5'
    ],
    'unaffected': [
      '17.0.0','16.1.3','15.1.6','14.1.5','13.1.5'
    ],
  },
  'iRulesLX': {
    'affected': [
      '16.1.0-16.1.2','15.1.0-15.1.5','14.1.0-14.1.4','13.1.0-13.1.4','12.1.0-12.1.6','11.6.1-11.6.5'
    ],
    'unaffected': [
      '17.0.0','16.1.3','15.1.6','14.1.5','13.1.5'
    ],
  }
};

if (bigip_is_affected(vmatrix:vmatrix, sol:sol))
{
  var extra = NULL;
  if (report_verbosity > 0) extra = bigip_report_get();
  security_report_v4(
      port       : 0,
      severity   : SECURITY_WARNING,
      extra      : extra
  );
}
else
{
  var tested = bigip_get_tested_modules();
  var audit_extra = 'For BIG-IP module(s) ' + tested + ',';
  if (tested) audit(AUDIT_INST_VER_NOT_VULN, audit_extra, version);
  else audit(AUDIT_HOST_NOT, 'running any of the affected modules');
}