Cisco IOS XE Software Digital Signature Verification Bypass (cisco-sa-iosxe-digsig-bypass-FYQ3bmVq)

#TRUSTED 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
#TRUST-RSA-SHA256 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
#
# (C) Tenable Network Security, Inc.
#

include('compat.inc');

if (description)
{
  script_id(137148);
  script_version("1.13");
  script_set_attribute(attribute:"plugin_modification_date", value:"2024/05/03");

  script_cve_id("CVE-2020-3209");
  script_xref(name:"CISCO-BUG-ID", value:"CSCvk61152");
  script_xref(name:"CISCO-BUG-ID", value:"CSCvp77508");
  script_xref(name:"CISCO-SA", value:"cisco-sa-iosxe-digsig-bypass-FYQ3bmVq");
  script_xref(name:"IAVA", value:"2020-A-0239-S");

  script_name(english:"Cisco IOS XE Software Digital Signature Verification Bypass (cisco-sa-iosxe-digsig-bypass-FYQ3bmVq)");

  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 a vulnerability due to an improper check
on the area of code that manages the verification of the digital signatures of system image files during the initial
boot process. An attacker could exploit this vulnerability by loading unsigned software on an affected device. A
successful exploit could allow the attacker to install and boot a malicious software image or execute unsigned binaries
on the targeted device.

Please see the included Cisco BIDs and Cisco Security Advisory for more information.");
  # https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-iosxe-digsig-bypass-FYQ3bmVq
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?feccc784");
  script_set_attribute(attribute:"see_also", value:"http://tools.cisco.com/security/center/viewErp.x?alertId=ERP-73388");
  script_set_attribute(attribute:"see_also", value:"https://bst.cloudapps.cisco.com/bugsearch/bug/CSCvk61152");
  script_set_attribute(attribute:"see_also", value:"https://bst.cloudapps.cisco.com/bugsearch/bug/CSCvp77508");
  script_set_attribute(attribute:"solution", value:
"Upgrade to the relevant fixed version referenced in Cisco bug IDs CSCvk61152, CSCvp77508");
  script_set_cvss_base_vector("CVSS2#AV:L/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:P/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-2020-3209");

  script_set_attribute(attribute:"exploitability_ease", value:"No known exploits are available");
  script_cwe_id(347);

  script_set_attribute(attribute:"vuln_publication_date", value:"2020/06/03");
  script_set_attribute(attribute:"patch_publication_date", value:"2020/06/03");
  script_set_attribute(attribute:"plugin_publication_date", value:"2020/06/05");

  script_set_attribute(attribute:"plugin_type", value:"combined");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:cisco:ios_xe");
  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) 2020-2024 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(
  '3.2.0SG',
  '3.2.1SG',
  '3.2.2SG',
  '3.2.3SG',
  '3.2.4SG',
  '3.2.5SG',
  '3.2.6SG',
  '3.2.7SG',
  '3.2.8SG',
  '3.2.9SG',
  '3.2.10SG',
  '3.2.11SG',
  '3.7.0S',
  '3.7.1S',
  '3.7.2S',
  '3.7.3S',
  '3.7.4S',
  '3.7.5S',
  '3.7.6S',
  '3.7.7S',
  '3.7.8S',
  '3.7.4aS',
  '3.7.2tS',
  '3.7.0bS',
  '3.7.1aS',
  '3.3.0SG',
  '3.3.2SG',
  '3.3.1SG',
  '3.8.0S',
  '3.8.1S',
  '3.8.2S',
  '3.9.1S',
  '3.9.0S',
  '3.9.2S',
  '3.9.1aS',
  '3.9.0aS',
  '3.2.0SE',
  '3.2.1SE',
  '3.2.2SE',
  '3.2.3SE',
  '3.3.0SE',
  '3.3.1SE',
  '3.3.2SE',
  '3.3.3SE',
  '3.3.4SE',
  '3.3.5SE',
  '3.3.0XO',
  '3.3.1XO',
  '3.3.2XO',
  '3.4.0SG',
  '3.4.2SG',
  '3.4.1SG',
  '3.4.3SG',
  '3.4.4SG',
  '3.4.5SG',
  '3.4.6SG',
  '3.4.7SG',
  '3.4.8SG',
  '3.5.0E',
  '3.5.1E',
  '3.5.2E',
  '3.5.3E',
  '3.10.0S',
  '3.10.1S',
  '3.10.2S',
  '3.10.3S',
  '3.10.4S',
  '3.10.5S',
  '3.10.6S',
  '3.10.2aS',
  '3.10.2tS',
  '3.10.7S',
  '3.10.8S',
  '3.10.8aS',
  '3.10.9S',
  '3.10.10S',
  '3.11.1S',
  '3.11.2S',
  '3.11.0S',
  '3.11.3S',
  '3.11.4S',
  '3.12.0S',
  '3.12.1S',
  '3.12.2S',
  '3.12.3S',
  '3.12.0aS',
  '3.12.4S',
  '3.13.0S',
  '3.13.1S',
  '3.13.2S',
  '3.13.3S',
  '3.13.4S',
  '3.13.5S',
  '3.13.2aS',
  '3.13.0aS',
  '3.13.5aS',
  '3.13.6S',
  '3.13.7S',
  '3.13.6aS',
  '3.13.6bS',
  '3.13.7aS',
  '3.13.8S',
  '3.13.9S',
  '3.13.10S',
  '3.6.0E',
  '3.6.1E',
  '3.6.0aE',
  '3.6.0bE',
  '3.6.2aE',
  '3.6.3E',
  '3.6.4E',
  '3.6.5E',
  '3.6.6E',
  '3.6.5aE',
  '3.6.5bE',
  '3.6.7E',
  '3.6.8E',
  '3.6.7aE',
  '3.6.7bE',
  '3.6.9E',
  '3.6.10E',
  '3.6.9aE',
  '3.14.0S',
  '3.14.1S',
  '3.14.2S',
  '3.14.3S',
  '3.14.4S',
  '3.15.0S',
  '3.15.1S',
  '3.15.2S',
  '3.15.1cS',
  '3.15.3S',
  '3.15.4S',
  '3.3.0SQ',
  '3.3.1SQ',
  '3.4.0SQ',
  '3.4.1SQ',
  '3.7.0E',
  '3.7.1E',
  '3.7.2E',
  '3.7.3E',
  '3.7.4E',
  '3.7.5E',
  '3.5.0SQ',
  '3.5.1SQ',
  '3.5.2SQ',
  '3.5.3SQ',
  '3.5.4SQ',
  '3.5.5SQ',
  '3.5.6SQ',
  '3.5.7SQ',
  '3.5.8SQ',
  '3.16.0S',
  '3.16.1S',
  '3.16.0aS',
  '3.16.1aS',
  '3.16.2S',
  '3.16.2aS',
  '3.16.0bS',
  '3.16.0cS',
  '3.16.3S',
  '3.16.2bS',
  '3.16.3aS',
  '3.16.4S',
  '3.16.4aS',
  '3.16.4bS',
  '3.16.4gS',
  '3.16.5S',
  '3.16.4cS',
  '3.16.4dS',
  '3.16.4eS',
  '3.16.6S',
  '3.16.5aS',
  '3.16.5bS',
  '3.16.7S',
  '3.16.6bS',
  '3.16.7aS',
  '3.16.7bS',
  '3.16.8S',
  '3.16.9S',
  '3.16.10S',
  '3.17.0S',
  '3.17.1S',
  '3.17.2S ',
  '3.17.1aS',
  '3.17.3S',
  '3.17.4S',
  '16.1.1',
  '16.1.2',
  '16.1.3',
  '16.2.1',
  '16.2.2',
  '3.8.0E',
  '3.8.1E',
  '3.8.2E',
  '3.8.3E',
  '3.8.4E',
  '3.8.5E',
  '3.8.5aE',
  '3.8.6E',
  '3.8.7E',
  '3.8.8E',
  '3.8.9E',
  '16.3.1',
  '16.3.2',
  '16.3.3',
  '16.3.1a',
  '16.3.4',
  '16.3.5',
  '16.3.5b',
  '16.3.6',
  '16.3.7',
  '16.3.8',
  '16.4.1',
  '16.4.2',
  '16.4.3',
  '16.5.1',
  '16.5.1a',
  '16.5.1b',
  '16.5.2',
  '16.5.3',
  '3.18.0aS',
  '3.18.0S',
  '3.18.1S',
  '3.18.2S',
  '3.18.3S',
  '3.18.4S',
  '3.18.0SP',
  '3.18.1SP',
  '3.18.1aSP',
  '3.18.1gSP',
  '3.18.1bSP',
  '3.18.1cSP',
  '3.18.2SP',
  '3.18.1hSP',
  '3.18.2aSP',
  '3.18.1iSP',
  '3.18.3SP',
  '3.18.4SP',
  '3.18.3aSP',
  '3.18.3bSP',
  '3.18.5SP',
  '3.18.6SP',
  '3.18.7SP',
  '3.18.8SP',
  '3.9.0E',
  '3.9.1E',
  '3.9.2E',
  '3.9.2bE',
  '16.6.1',
  '16.6.2',
  '16.6.3',
  '16.6.4',
  '16.6.5',
  '16.6.4s',
  '16.6.4a',
  '16.6.5a',
  '16.6.6',
  '16.6.5b',
  '16.6.7',
  '16.6.7a',
  '16.7.1',
  '16.7.1a',
  '16.7.1b',
  '16.7.2',
  '16.7.3',
  '16.7.4',
  '16.8.1',
  '16.8.1a',
  '16.8.1b',
  '16.8.1s',
  '16.8.1c',
  '16.8.1d',
  '16.8.2',
  '16.8.1e',
  '16.8.3',
  '16.9.1',
  '16.9.2',
  '16.9.1a',
  '16.9.1b',
  '16.9.1s',
  '16.9.1c',
  '16.9.1d',
  '16.9.3',
  '16.9.2a',
  '16.9.2s',
  '16.9.3h',
  '16.9.4',
  '16.9.3s',
  '16.9.4c',
  '16.10.1',
  '16.10.1a',
  '16.10.1b',
  '16.10.1s',
  '16.10.1c',
  '16.10.1e',
  '16.10.1d',
  '16.10.2',
  '16.10.1f',
  '16.10.1g',
  '3.10.0E',
  '3.10.1E',
  '3.10.0cE',
  '3.10.2E',
  '3.10.1aE',
  '3.10.1sE',
  '3.10.3E',
  '16.11.1',
  '16.11.1a',
  '16.11.1b',
  '16.12.1y',
  '3.11.0E',
  '3.11.1E'
);

reporting = make_array(
  'port'     , product_info['port'], 
  'severity' , SECURITY_HOLE,
  'version'  , product_info['version'],
  'bug_id'   , 'CSCvk61152, CSCvp77508',
  'disable_caveat', TRUE
);

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