Vulnerabilities > CVE-2018-15372 - Unspecified vulnerability in Cisco IOS XE 16.8.1/16.9.1

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

include('compat.inc');

if (description)
{
  script_id(132104);
  script_version("1.4");
  script_cvs_date("Date: 2020/01/16");

  script_cve_id("CVE-2018-15372");
  script_bugtraq_id(105416);
  script_xref(name:"CISCO-BUG-ID", value:"CSCvh09411");
  script_xref(name:"CISCO-SA", value:"cisco-sa-20180926-macsec");

  script_name(english:"Cisco IOS XE Software MACsec MKA Using EAP-TLS Authentication Bypass (cisco-sa-20180926-macsec)");

  script_set_attribute(attribute:"synopsis", value:
"The remote device is missing a vendor-supplied security patch.");
  script_set_attribute(attribute:"description", value:
"According to its self-reported version, Cisco IOS XE Software is affected by an authentication bypass vulnerability
in the MACsec Key Agreement (MKA) using Extensible Authentication Protocol-Transport Layer Security (EAP-TLS)
functionality due to a logic error. An unauthenticated, adjacent attacker can exploit this, by connecting to and
passing traffic through a Layer 3 interface of an affected device, if the interface is configured for MACsec MKA using
EAP-TLS and is running in 'access-session closed' mode. A successful exploit allows the attacker to bypass 802.1x
network access controls and gain access to the network.

Please see the included Cisco BIDs and Cisco Security Advisory for more information.

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version
number.");
  # https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20180926-macsec
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?52021652");
  script_set_attribute(attribute:"see_also", value:"https://bst.cloudapps.cisco.com/bugsearch/bug/CSCvh09411");
  script_set_attribute(attribute:"solution", value:
"Upgrade to the relevant fixed version referenced in Cisco bug ID(s) CSCvh09411.");
  script_set_cvss_base_vector("CVSS2#AV:A/AC:L/Au:N/C:P/I:P/A:N");
  script_set_cvss_temporal_vector("CVSS2#E:U/RL:OF/RC:C");
  script_set_cvss3_base_vector("CVSS:3.0/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N");
  script_set_cvss3_temporal_vector("CVSS:3.0/E:U/RL:O/RC:C");
  script_set_attribute(attribute:"cvss_score_source", value:"CVE-2018-15372");

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

  script_set_attribute(attribute:"vuln_publication_date", value:"2018/09/26");
  script_set_attribute(attribute:"patch_publication_date", value:"2018/09/26");
  script_set_attribute(attribute:"plugin_publication_date", value:"2019/12/18");

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

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

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

  script_dependencies("cisco_ios_xe_version.nasl");
  script_require_keys("Host/Cisco/IOS-XE/Version");

  exit(0); 
}

include('cisco_workarounds.inc');
include('ccf.inc');

product_info = cisco::get_product_info(name:'Cisco IOS XE Software');

version_list = make_list(
  '16.1.1',
  '16.1.2',
  '16.1.3',
  '16.2.1',
  '16.2.2',
  '16.3.1',
  '16.3.2',
  '16.3.3',
  '16.3.1a',
  '16.3.4',
  '16.3.5',
  '16.3.5b',
  '16.3.6',
  '16.4.1',
  '16.4.2',
  '16.4.3',
  '16.5.1',
  '16.5.1a',
  '16.5.1b',
  '16.5.2',
  '16.5.3',
  '3.18.3bSP',
  '16.6.1',
  '16.6.2',
  '16.6.3',
  '16.7.1',
  '16.7.1a',
  '16.7.1b',
  '16.7.2',
  '16.7.3',
  '16.8.1',
  '16.8.1a',
  '16.8.1b',
  '16.8.1c'
);

workarounds = make_list(CISCO_WORKAROUNDS['macsec_eap-tls']);
workaround_params = make_list();

reporting = make_array(
  'port'     , 0,
  'severity' , SECURITY_WARNING,
  'version'  , product_info['version'],
  'bug_id'   , 'CSCvh09411',
  'cmds'     , make_list('show running-config')
);

cisco::check_and_report(
  product_info:product_info,
  workarounds:workarounds,
  workaround_params:workaround_params,
  reporting:reporting,
  vuln_versions:version_list
);