ISC BIND 9.10.5-S1 < 9.11.5-S6 Assertion Failure Vulnerability

#
# (C) Tenable Network Security, Inc.
#

include("compat.inc");

if (description)
{
  script_id(124562);
  script_version("1.4");
  script_set_attribute(attribute:"plugin_modification_date", value:"2020/05/22");

  script_cve_id("CVE-2019-6468");
  script_bugtraq_id(108070);
  script_xref(name:"IAVA", value:"2019-A-0139-S");

  script_name(english:"ISC BIND 9.10.5-S1 < 9.11.5-S6 Assertion Failure Vulnerability");
  script_summary(english:"Checks the version of ISC BIND.");

  script_set_attribute(attribute:"synopsis", value:
"The remote name server is affected by an assertion failure vulnerability.");
  script_set_attribute(attribute:"description", value:
"ISC BIND versions 9.11.5-S5 and earlier are affected by an error in the nxdomain-redirect feature in versions which
support EDNS Client Subnet (ECS) features. In those versions which have ECS support, enabling nxdomain-redirect is likely
to lead to BIND exiting due to assertion failure.");
  script_set_attribute(attribute:"see_also", value:"https://kb.isc.org/docs/aa-00861");
  script_set_attribute(attribute:"see_also", value:"https://kb.isc.org/docs/aa-00913");
  script_set_attribute(attribute:"see_also", value:"https://kb.isc.org/docs/cve-2019-6468");
  script_set_attribute(attribute:"solution", value:
"Upgrade to ISC BIND version 9.11.6-S5, 9.11.6-S1, or later.");
  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:H");
  script_set_cvss3_temporal_vector("CVSS:3.0/E:U/RL:O/RC:C");
  script_set_attribute(attribute:"cvss_score_source", value:"CVE-2019-6468");

  script_set_attribute(attribute:"exploitability_ease", value:"No known exploits are available");

  script_set_attribute(attribute:"vuln_publication_date", value:"2019/04/24");
  script_set_attribute(attribute:"patch_publication_date", value:"2019/04/24");
  script_set_attribute(attribute:"plugin_publication_date", value:"2019/05/03");

  script_set_attribute(attribute:"potential_vulnerability", value:"true");
  script_set_attribute(attribute:"plugin_type", value:"remote");
  script_set_attribute(attribute:"cpe", value:"cpe:/a:isc:bind");
  script_set_attribute(attribute:"stig_severity", value:"I");
  script_end_attributes();

  script_category(ACT_GATHER_INFO);
  script_family(english:"DNS");

  script_copyright(english:"This script is Copyright (C) 2019-2020 and is owned by Tenable, Inc. or an Affiliate thereof.");

  script_dependencies("bind_version.nasl");
  script_require_keys("bind/version", "Settings/ParanoidReport");

  exit(0);
}

include("vcf.inc");
include("vcf_extras.inc");

vcf::bind::initialize();

app_info = vcf::get_app_info(app:"BIND", port:53, kb_ver:"bind/version", service:TRUE, proto:"UDP");

if (report_paranoia < 2) audit(AUDIT_PARANOID);

constraints = [
  { "min_version" : "9.10.5-S1", "fixed_version" : "9.11.5-S6", "fixed_display" : "9.11.5-S6 / 9.11.6-S1"}
];
constraints = vcf::bind::filter_constraints(constraints:constraints, version:app_info.version);

vcf::check_version_and_report(app_info:app_info, constraints:constraints, severity:SECURITY_WARNING);