Juniper Networks Junos OS DNSSEC validation Denial of Service

# SPDX-FileCopyrightText: 2013 Greenbone AG
# Some text descriptions might be excerpted from (a) referenced
# source(s), and are Copyright (C) by the respective right holder(s).
#
# SPDX-License-Identifier: GPL-2.0-only

CPE = "cpe:/o:juniper:junos";

if (description)
{
  script_oid("1.3.6.1.4.1.25623.1.0.103948");
  script_version("2026-04-24T06:23:04+0000");
  script_tag(name:"last_modification", value:"2026-04-24 06:23:04 +0000 (Fri, 24 Apr 2026)");
  script_tag(name:"creation_date", value:"2013-10-15 21:39:27 +0700 (Tue, 15 Oct 2013)");
  script_tag(name:"cvss_base", value:"7.8");
  script_tag(name:"cvss_base_vector", value:"AV:N/AC:L/Au:N/C:N/I:N/A:C");

  script_tag(name:"qod_type", value:"package");

  script_tag(name:"solution_type", value:"VendorFix");

  script_cve_id("CVE-2012-3817");

  script_name("Juniper Networks Junos OS DNSSEC validation Denial of Service");

  script_category(ACT_GATHER_INFO);
  script_copyright("Copyright (C) 2013 Greenbone AG");
  script_family("JunOS Local Security Checks");
  script_dependencies("gb_juniper_junos_consolidation.nasl");
  script_mandatory_keys("juniper/junos/detected", "juniper/junos/build");

  script_tag(name:"summary", value:"Heavy DNSSEC validation load can cause assertion failure in Bind
of Junos OS.");

  script_tag(name:"vuldetect", value:"Checks if a vulnerable OS build is present on the target host.");

  script_tag(name:"insight", value:"BIND stores a cache of query names that are known to be failing
due to misconfigured name servers or a broken chain of trust. Under high query loads, when DNSSEC
validation is active, it is possible for a condition to arise in which data from this cache of failing
queries could be used before it was fully initialized, triggering an assertion failure.");

  script_tag(name:"impact", value:"An attacker that is able to generate high volume of DNSSEC
validation enabled queries can trigger the assertion failure that causes it to crash, resulting in a
denial of service.");

  script_tag(name:"affected", value:"Junos OS software build before 2013-02-13.");

  script_tag(name:"solution", value:"New builds of Junos OS software are available from Juniper. As
a workaround disable the security extension if DNSSEC is not required by typing delete system services
dns dnssec.");

  script_xref(name:"URL", value:"http://kb.juniper.net/JSA10556");
  script_xref(name:"URL", value:"http://www.securityfocus.com/bid/54658");

  exit(0);
}

include("host_details.inc");
include("version_func.inc");

if (!version = get_app_version(cpe: CPE, nofork: TRUE))
  exit(0);

build = get_kb_item("juniper/junos/build");
if (!build)
  exit(0);

desc += "Version/Build-Date:
" + version + " / " + build;

build2check = str_replace(string:build, find:"-", replace:"");

if (version_is_greater(version:build2check, test_version:"20130212")) {
  exit(99);
}

if (version_is_less(version:version, test_version:"10.4R13")) {
  security_message(port:0, data:desc);
  exit(0);
}

if (ereg(pattern:"^11", string:version)) {
  if (version_is_less(version:version, test_version:"11.4.R6")) {
    security_message(port:0, data:desc);
    exit(0);
  } else if (version_is_less(version:version, test_version:"11.4X27.43") &&
             version_is_greater(version:version, test_version:"11.4.X")) {
      security_message(port:0, data:desc);
      exit(0);
  }
}

if (ereg(pattern:"^12\.1", string:version)) {
  if (version_is_less(version:version, test_version:"12.1R5")) {
    security_message(port:0, data:desc);
    exit(0);
  } else if (version_is_less(version:version, test_version:"12.1X44-D15") &&
             version_is_greater(version:version, test_version:"12.1X"))  {
      security_message(port:0, data:desc);
      exit(0);
  }
}

if (ereg(pattern:"^12\.2", string:version)) {
  if (version_is_less(version:version, test_version:"12.2R3")) {
    security_message(port:0, data:desc);
    exit(0);
  }
}

if (ereg(pattern:"^12\.3", string:version)) {
  if (version_is_less(version:version, test_version:"12.3R1")) {
    security_message(port:0, data:desc);
    exit(0);
  } else if (version_is_less(version:version, test_version:"12.3X50-D11") &&
             version_is_greater(version:version, test_version:"12.3X")) {
      security_message(port:0, data:desc);
      exit(0);
  }
}

exit(99);