Cisco IOS LISP ITR DoS (CSCun73782)

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

include("compat.inc");

if (description)
{
  script_id(79249);
  script_version("1.9");
  script_cvs_date("Date: 2019/11/25");

  script_cve_id("CVE-2014-3262");
  script_bugtraq_id(67399);
  script_xref(name:"CISCO-BUG-ID", value:"CSCun73782");

  script_name(english:"Cisco IOS LISP ITR DoS (CSCun73782)");
  script_summary(english:"Checks the IOS version.");

  script_set_attribute(attribute:"synopsis", value:
"The remote device is running a vulnerable IOS version.");
  script_set_attribute(attribute:"description", value:
"The remote Cisco device is potentially affected by an issue related to
the handling of certain parameters in Locator/ID Separation Protocol
(LISP) control messages sent to the ingress tunnel router (ITR)
component. A remote, unauthenticated attacker could exploit this issue
by sending specially crafted LISP control messages to cause a denial
of service.");
  # https://tools.cisco.com/security/center/viewAlert.x?alertId=34233
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?1b307af3");
  script_set_attribute(attribute:"see_also", value:"https://tools.cisco.com/security/center/viewAlert.x?alertId=34233");
  script_set_attribute(attribute:"solution", value:
"Upgrade to the relevant fixed version referenced in Cisco bug ID
  CSCun73782.");
  script_set_cvss_base_vector("CVSS2#AV:N/AC:M/Au:N/C:N/I:N/A:P");
  script_set_cvss_temporal_vector("CVSS2#E:U/RL:OF/RC:C");
  script_set_attribute(attribute:"cvss_score_source", value:"CVE-2014-3262");

  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:"2014/05/14");
  script_set_attribute(attribute:"patch_publication_date", value:"2014/05/30");
  script_set_attribute(attribute:"plugin_publication_date", value:"2014/11/14");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:cisco:ios");
  script_end_attributes();

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

  script_copyright(english:"This script is Copyright (C) 2014-2019 and is owned by Tenable, Inc. or an Affiliate thereof.");

  script_dependencies("cisco_ios_version.nasl");
  script_require_keys("Host/Cisco/IOS/Version");
  script_require_ports("Host/Cisco/IOS/Model", "CISCO/model");

  exit(0);
}

include("audit.inc");
include("cisco_func.inc");
include("cisco_kb_cmd_func.inc");

# check model
model = get_kb_item("CISCO/model");
if (isnull(model)) model = get_kb_item_or_exit("Host/Cisco/IOS/Model");
if (model !~ "(^|[^0-9]+)(8|9|18|19|28|29|38|39|72)[0-9][0-9]($|[^0-9])") audit(AUDIT_HOST_NOT, "affected");

version = get_kb_item_or_exit("Host/Cisco/IOS/Version");

if (
  version == "15.3(3)XB12" ||
  version == "15.2(4)XB9"  ||
  version =~ "^15\.3\(3\)[MS]($|[01]($|[^0-9]))"  ||
  version =~ "^15\.3\(3\)M2($|\.[0-3]($|[^0-9]))" ||
  version =~ "^15\.3\(3\)S2($|\.[0-7]($|[^0-9]))" ||
  version =~ "^15\.4\([12]\)S($|0($|[^0-9]))" ||
  version =~ "^15\.4\(1\)S1($|\.[0-2]($|[^0-9]))" ||
  version =~ "^15\.4\(2\)S0($|\.[0-2]($|[^0-9]))"
)
{
  flag     = FALSE;
  override = FALSE;

  if (get_kb_item("Host/local_checks_enabled"))
  {
    buf = cisco_command_kb_item("Host/Cisco/Config/show_running-config", "show running-config");
    if (check_cisco_result(buf))
    {
      if (preg(multiline:TRUE, pattern:"^\s+ipv[46]\sitr(\s|$)", string:buf))
        flag = TRUE;
    }
    else if (cisco_needs_enable(buf)) override = TRUE;
  }

  if (!flag && !override) audit(AUDIT_HOST_NOT, "affected");

  if (report_verbosity > 0)
  {
    report =
      '\n  Cisco Bug ID        : CSCun73782' +
      '\n    Installed release : ' + version + 
      '\n';

    security_warning(port:0, extra:report+cisco_caveat(override));
    exit(0);
  }
  else security_warning(port:0, extra:cisco_caveat(override));
}
else audit(AUDIT_INST_VER_NOT_VULN, "Cisco IOS software", version);