Vulnerabilities > CVE-2018-0155 - Improper Handling of Exceptional Conditions vulnerability in Cisco IOS and IOS XE

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

include('compat.inc');

if (description)
{
  script_id(135922);
  script_version("1.2");
  script_set_attribute(attribute:"plugin_modification_date", value:"2020/04/24");

  script_cve_id("CVE-2018-0155");
  script_bugtraq_id(103565);
  script_xref(name:"CISCO-BUG-ID", value:"CSCvc40729");
  script_xref(name:"CISCO-SA", value:"cisco-sa-20180328-bfd");

  script_name(english:"Cisco IOS and IOS XE Software Denial of Service Vulnerability (cisco-sa-20180328-bfd)");

  script_set_attribute(attribute:"synopsis", value:
"The remote device is missing a vendor-supplied security patch");
  script_set_attribute(attribute:"description", value:
"A denial of service (DoS) vulnerability exists in the Bidirectional Forwarding Detection (BFD) offload implementation of
Cisco Catalyst 4500 Series Switches and Cisco Catalyst 4500-X Series Switches due to insufficient error handling when the
BFD header in a BFD packet is incomplete. An unauthenticated, remote attacker can exploit this issue by sending crafted
BFD message to or across an affected switch. If the attacker is succesful then this could allow the attacker to trigger
a reload of the system.

Please see the included Cisco BIDs and Cisco Security Advisory for more information");
  # https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20180328-bfd
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?c66d9346");
  script_set_attribute(attribute:"see_also", value:"https://bst.cloudapps.cisco.com/bugsearch/bug/CSCvc40729");
  script_set_attribute(attribute:"solution", value:
"Upgrade to the relevant fixed version referenced in Cisco bug IDs CSCvc40729");
  script_set_cvss_base_vector("CVSS2#AV:N/AC:L/Au:N/C:N/I:N/A:C");
  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:C/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-2018-0155");

  script_set_attribute(attribute:"exploitability_ease", value:"No known exploits are available");
  script_cwe_id(388);

  script_set_attribute(attribute:"vuln_publication_date", value:"2018/03/28");
  script_set_attribute(attribute:"patch_publication_date", value:"2018/03/28");
  script_set_attribute(attribute:"plugin_publication_date", value:"2020/04/23");

  script_set_attribute(attribute:"plugin_type", value:"combined");
  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) 2020 and is owned by Tenable, Inc. or an Affiliate thereof.");

  script_dependencies("cisco_ios_version.nasl");
  script_require_keys("Host/Cisco/show_ver");

  exit(0);
}

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

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

if (product_info['model'] !~ "4(500(E|-X)?)|(9(00M|48E))")
  audit(AUDIT_DEVICE_NOT_VULN, 'The Model ' + product_info['model']);


vuln_versions = [
  '15.1SG',
  '15.1(1)SG',
  '15.1(2)SG',
  '15.1(1)SG1',
  '15.1(1)SG2',
  '15.1(2)SG1',
  '15.1(2)SG2',
  '15.1(2)SG3',
  '15.1(2)SG4',
  '15.1(2)SG5',
  '15.1(2)SG6',
  '15.1(2)SG7',
  '15.1(2)SG8',
  '15.2E',
  '15.2(1)E',
  '15.2(2)E',
  '15.2(1)E1',
  '15.2(3)E',
  '15.2(1)E3',
  '15.2(2)E1',
  '15.2(2b)E',
  '15.2(4)E',
  '15.2(3)E1',
  '15.2(2)E2',
  '15.2(2)E3',
  '15.2(3)E2',
  '15.2(3)E3',
  '15.2(4)E1',
  '15.2(2)E4',
  '15.2(2)E5',
  '15.2(4)E2',
  '15.2(3)E4',
  '15.2(4)E3',
  '15.2(2)E6',
  '15.2(2)E5a',
  '15.2(3)E5',
  '15.2(2)E5b',
  '15.2(4)E4',
  '15.2(2)E7',
  '15.2(4)E5',
  '15.2(2)E7b',
  '15.2(4)E5a',
  '15.2(4s)E2'
];

workarounds = make_list(CISCO_WORKAROUNDS['bfd']);
workaround_params = [];

reporting = make_array(
  'port'     , 0,
  'severity' , SECURITY_HOLE,
  'version'  , product_info['version']
);

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

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

include('compat.inc');

if (description)
{
  script_id(132680);
  script_version("1.4");
  script_cvs_date("Date: 2020/01/09");

  script_cve_id("CVE-2018-0155");
  script_bugtraq_id(103565);
  script_xref(name:"CISCO-BUG-ID", value:"CSCvc40729");
  script_xref(name:"CISCO-SA", value:"cisco-sa-20180328-bfd");
  script_xref(name:"IAVA", value:"2018-A-0098");

  script_name(english:"Cisco IOS Software Bidirectional Forwarding Detection DoS (cisco-sa-20180328-bfd)");

  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 is affected by a denial of service (DoS) vulnerability in the
Bidirectional Forwarding Detection (BFD) offload implementation due to insufficient error handling when the BFD header
in a BFD packet is incomplete. An unauthenticated, remote attacker could exploit this, by sending a crafted BFD message
to or across an affected switch, in order to crash the iosd process and trigger a system reload.

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-20180328-bfd
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?c66d9346");
  script_set_attribute(attribute:"see_also", value:"https://bst.cloudapps.cisco.com/bugsearch/bug/CSCvc40729");
  script_set_attribute(attribute:"solution", value:
"Upgrade to the relevant fixed version referenced in Cisco bug ID(s) CSCvc40729.");
  script_set_cvss_base_vector("CVSS2#AV:N/AC:L/Au:N/C:N/I:N/A:C");
  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:C/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-2018-0155");

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

  script_set_attribute(attribute:"vuln_publication_date", value:"2018/03/28");
  script_set_attribute(attribute:"patch_publication_date", value:"2018/03/28");
  script_set_attribute(attribute:"plugin_publication_date", value:"2020/01/07");

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

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

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

  script_dependencies("cisco_ios_version.nasl");
  script_require_keys("Host/Cisco/IOS/Version", "Host/Cisco/IOS/Model", "Settings/ParanoidReport");

  exit(0);
}

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

if (report_paranoia < 2) audit(AUDIT_PARANOID);

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

if ('catalyst' >!< tolower(product_info.model) || product_info.model !~ "4[59]\d\d(^\d|$)")
  audit(AUDIT_HOST_NOT, "affected");

version_list = make_list(
  '15.1(1)SG',
  '15.1(2)SG',
  '15.1(1)SG1',
  '15.1(1)SG2',
  '15.1(2)SG1',
  '15.1(2)SG2',
  '15.1(2)SG3',
  '15.1(2)SG4',
  '15.1(2)SG5',
  '15.1(2)SG6',
  '15.1(2)SG7',
  '15.1(2)SG8',
  '15.2(1)E',
  '15.2(2)E',
  '15.2(1)E1',
  '15.2(3)E',
  '15.2(1)E3',
  '15.2(2)E1',
  '15.2(2b)E',
  '15.2(4)E',
  '15.2(3)E1',
  '15.2(2)E2',
  '15.2(2)E3',
  '15.2(3)E2',
  '15.2(3)E3',
  '15.2(4)E1',
  '15.2(2)E4',
  '15.2(2)E5',
  '15.2(4)E2',
  '15.2(3)E4',
  '15.2(4)E3',
  '15.2(2)E6',
  '15.2(2)E5a',
  '15.2(3)E5',
  '15.2(2)E5b',
  '15.2(4)E4',
  '15.2(2)E7',
  '15.2(4)E5',
  '15.2(2)E7b',
  '15.2(4)E5a',
  '15.2(4s)E2'
);

# Script is paranoid, so workarounds should be omitted
workarounds = make_list(CISCO_WORKAROUNDS['no_workaround']);

reporting = make_array(
  'port'     , 0,
  'severity' , SECURITY_HOLE,
  'version'  , product_info['version'],
  'bug_id'   , 'CSCvc40729'
);

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