Vulnerabilities > CVE-2020-3119 - Out-of-bounds Write vulnerability in Cisco Nx-Os

#TRUSTED 3a665e7a5a1559ceb9def750ecd3e3356678f36231a0ddf8380a2448957d210fbae0456a35d2fe9c5a627d945eb56d363ca374a1d4557dbfb277fc5e127868117131e0658e63d644935a098b7da2db7adc682eefa9cecdc422bbd56fc9700dc7e68fce806965bc4ea53e177ca385f186700dc947b54540b3cee899583230ae7acab6381c914e9a25e0c184141e668225d8c70dc56d9572808e14c6cb0811101ad493409f8e763cb3a876f623aca8c085721a45b05d07e3d3e11aedb20e32bb2703886de21b47273f21bd2585bdc666ea23438c413e0a34ec1b866c70f9980e1fe3ed44dab2fc332428aad89b143423d5cae02548c62ed7c4227f9c09e45e30e67e0973f5ecb20d73ca6dbb70ca0c0d303e6b60bc497a13fbb48b0111dbedbcb7f476783176268229240431f92025fccd2e715eda378b5e59280cdeebd1c0742c85ed59c7bac49ddaebd139599b4eb26f959a6178781435898f089c8145d9fbcdf82d0d80ec10fc8deb6f5ed3a190429f8177e38ba43e0a3793555d6b9f91aebde080093a47770157a6ae2858ec108afa6ee8b248aab69855a06470764aa2518352e2c344969f0ad7178d70ec21bda8241471c4603254c91bc6d5ed73ff51e87735be19006a86f93384a18d516744e5dd5f0f8c4a1131bcdc4106b2e65e397c713b33f7dc4660c8633033d303fc26c91772f33232386829a9997cefdf8bbdb976
#
# (C) Tenable Network Security, Inc.
#

include('compat.inc');

if (description)
{
  script_id(133604);
  script_version("1.7");
  script_set_attribute(attribute:"plugin_modification_date", value:"2020/04/01");

  script_cve_id("CVE-2020-3119");
  script_xref(name:"CISCO-BUG-ID", value:"CSCvr09175");
  script_xref(name:"CISCO-BUG-ID", value:"CSCvr09531");
  script_xref(name:"CISCO-SA", value:"cisco-sa-20200205-nxos-cdp-rce");
  script_xref(name:"IAVA", value:"2020-A-0068");

  script_name(english:"Cisco NX-OS Software Cisco Discovery Protocol Remote Code Execution Vulnerability (cisco-sa-20200205-nxos-cdp-rce)");

  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, the Cisco NX-OS System Software is affected by a remote code execution
vulnerability within the Cisco Discovery Protocol due to improper validation of input. An unauthenticated, adjacent
attacker can exploit this to bypass authentication and execute arbitrary commands with root privileges.

Please see the included Cisco BIDs and Cisco Security Advisory for more information.");
  # https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20200205-nxos-cdp-rce
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?9811503b");
  script_set_attribute(attribute:"see_also", value:"https://bst.cloudapps.cisco.com/bugsearch/bug/CSCvr09175");
  script_set_attribute(attribute:"see_also", value:"https://bst.cloudapps.cisco.com/bugsearch/bug/CSCvr09531");
  script_set_attribute(attribute:"solution", value:
"Upgrade to the relevant fixed version referenced in Cisco bug ID CSCvr09175 and/or CSCvr09531.");
  script_set_cvss_base_vector("CVSS2#AV:A/AC:L/Au:N/C:C/I:C/A:C");
  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:H");
  script_set_cvss3_temporal_vector("CVSS:3.0/E:U/RL:O/RC:C");
  script_set_attribute(attribute:"cvss_score_source", value:"CVE-2020-3119");

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

  script_set_attribute(attribute:"vuln_publication_date", value:"2020/02/05");
  script_set_attribute(attribute:"patch_publication_date", value:"2020/02/05");
  script_set_attribute(attribute:"plugin_publication_date", value:"2020/02/10");

  script_set_attribute(attribute:"potential_vulnerability", value:"true");
  script_set_attribute(attribute:"plugin_type", value:"combined");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:cisco:nx-os");
  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_nxos_version.nasl");
  script_require_keys("Host/Cisco/NX-OS/Version", "Host/Cisco/NX-OS/Model", "Host/Cisco/NX-OS/Device", "Settings/ParanoidReport");

  exit(0);
}

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

product_info = cisco::get_product_info(name:'Cisco NX-OS Software');



cbi = '';

if ('Nexus' >< product_info.device)
{
  if (product_info.model =~ "^3[0-9]{3}")
    cbi = 'CSCvr09175';
  else if (product_info.model =~ "^9[0-9]{3}")
    cbi = 'CSCvr09175, CSCvr09531';
}
if (empty_or_null(cbi))
  audit(AUDIT_HOST_NOT, 'an affected model');

if (report_paranoia < 2)
  audit(AUDIT_PARANOID);

version_list=make_list(
  '7.0(3)I7(1)',
  '7.0(3)I7(2)',
  '7.0(3)I7(3)',
  '7.0(3)I7(4)',
  '7.0(3)I7(5)',
  '7.0(3)I7(5a)',
  '7.0(3)I7(3z)',
  '7.0(3)I7(6)',
  '7.0(3)I7(6z)',
  '7.0(3)I7(7)',
  '7.0(3)IA7(1)',
  '7.0(3)IA7(2)',
  '7.0(3)IM7(2)',
  '9.2(1)',
  '9.2(2)',
  '9.2(2t)',
  '9.2(3)',
  '9.2(3y)',
  '9.2(4)',
  '9.2(2v)',
  '9.3(1)',
  '9.3(1z)',
  '14.0(1h)',
  '14.0(2c)',
  '14.0(3d)',
  '14.0(3c)',
  '14.1(1i)',
  '14.1(1j)',
  '14.1(1k)',
  '14.1(1l)',
  '14.1(2g)',
  '14.1(2m)',
  '14.1(2o)',
  '14.1(2s)',
  '14.1(2u)',
  '14.1(2w)',
  '14.2(1i)'
);

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

reporting = make_array(
  'port'     , 0,
  'severity' , SECURITY_HOLE,
  'version'  , product_info.version,
  'bug_id'   , cbi
);

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