Vulnerabilities > CVE-2019-1748 - Improper Certificate Validation vulnerability in Cisco IOS and IOS XE

047910
CVSS 7.4 - HIGH
Attack vector
NETWORK
Attack complexity
HIGH
Privileges required
NONE
Confidentiality impact
HIGH
Integrity impact
HIGH
Availability impact
NONE
network
high complexity
cisco
CWE-295
nessus
NVD
Published: 2019-03-28
Updated: 2024-11-21

Summary

A vulnerability in the Cisco Network Plug-and-Play (PnP) agent of Cisco IOS Software and Cisco IOS XE Software could allow an unauthenticated, remote attacker to gain unauthorized access to sensitive data. The vulnerability exists because the affected software insufficiently validates certificates. An attacker could exploit this vulnerability by supplying a crafted certificate to an affected device. A successful exploit could allow the attacker to conduct man-in-the-middle attacks to decrypt and modify confidential information on user connections to the affected software.

Vulnerable Configurations

Part Description Count
OS
Cisco
930

Common Weakness Enumeration (CWE)

Common Attack Pattern Enumeration and Classification (CAPEC)

  • Creating a Rogue Certificate Authority Certificate
    An attacker exploits a weakness in the MD5 hash algorithm (weak collision resistance) to generate a certificate signing request (CSR) that contains collision blocks in the "to be signed" part. The attacker specially crafts two different, but valid X.509 certificates that when hashed with the MD5 algorithm would yield the same value. The attacker then sends the CSR for one of the certificates to the Certification Authority which uses the MD5 hashing algorithm. That request is completely valid and the Certificate Authority issues an X.509 certificate to the attacker which is signed with its private key. An attacker then takes that signed blob and inserts it into another X.509 certificate that the attacker generated. Due to the MD5 collision, both certificates, though different, hash to the same value and so the signed blob works just as well in the second certificate. The net effect is that the attackers' second X.509 certificate, which the Certification Authority has never seen, is now signed and validated by that Certification Authority. To make the attack more interesting, the second certificate could be not just a regular certificate, but rather itself a signing certificate. Thus the attacker is able to start their own Certification Authority that is anchored in its root of trust in the legitimate Certification Authority that has signed the attackers' first X.509 certificate. If the original Certificate Authority was accepted by default by browsers, so will now the Certificate Authority set up by the attacker and of course any certificates that it signs. So the attacker is now able to generate any SSL certificates to impersonate any web server, and the user's browser will not issue any warning to the victim. This can be used to compromise HTTPS communications and other types of systems where PKI and X.509 certificates may be used (e.g., VPN, IPSec) .

Nessus

  • NASL familyCISCO
    NASL idCISCO-SA-20190327-PNP-CERT-IOSXE.NASL
    descriptionAccording to its self-reported version, the installed Cisco IOS XE software is affected by a vulnerability in the Cisco Network Plug-and-Play (PnP) agent. This vulnerability allows an unauthenticated, remote attacker to gain unauthorized access to sensitive data. The vulnerability exists because the affected software insufficiently validates certificates. An attacker can exploit this vulnerability by supplying a specially crafted certificate to an affected device. A successful exploit allows the attacker to conduct man-in-the-middle attacks to decrypt and modify confidential information on user connections to the affected software. (CVE-2019-1748) 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
    last seen2020-06-01
    modified2020-06-02
    plugin id127050
    published2019-07-26
    reporterThis script is Copyright (C) 2019 and is owned by Tenable, Inc. or an Affiliate thereof.
    sourcehttps://www.tenable.com/plugins/nessus/127050
    titleCisco IOS XE Software Network Plug-and-Play Agent Certificate Validation Vulnerability
    code
    #TRUSTED 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
#
# (C) Tenable Network Security, Inc.
#

include("compat.inc");

if (description)
{
  script_id(127050);
  script_version("1.5");
  script_cvs_date("Date: 2019/12/20");

  script_cve_id("CVE-2019-1748");
  script_bugtraq_id(107619);
  script_xref(name:"CISCO-BUG-ID", value:"CSCvf36269");
  script_xref(name:"CISCO-BUG-ID", value:"CSCvg01089");
  script_xref(name:"CISCO-SA", value:"cisco-sa-20190327-pnp-cert");

  script_name(english:"Cisco IOS XE Software Network Plug-and-Play Agent Certificate Validation Vulnerability");
  script_summary(english:"Checks the version of Cisco IOS XE Software");

  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 installed Cisco IOS XE software is affected by a vulnerability in the
Cisco Network Plug-and-Play (PnP) agent. This vulnerability allows an unauthenticated, remote attacker to gain
unauthorized access to sensitive data. The vulnerability exists because the affected software insufficiently validates
certificates. An attacker can exploit this vulnerability by supplying a specially crafted certificate to an affected
device. A successful exploit allows the attacker to conduct man-in-the-middle attacks to decrypt and modify
confidential information on user connections to the affected software. (CVE-2019-1748)

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-20190327-pnp-cert
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?9f246a7b");
  script_set_attribute(attribute:"see_also", value:"http://tools.cisco.com/security/center/viewErp.x?alertId=ERP-71135");
  script_set_attribute(attribute:"see_also", value:"https://bst.cloudapps.cisco.com/bugsearch/bug/CSCvf36269");
  script_set_attribute(attribute:"see_also", value:"https://bst.cloudapps.cisco.com/bugsearch/bug/CSCvg01089");
  script_set_attribute(attribute:"solution", value:
"Upgrade to the relevant fixed version referenced in Cisco bug IDs CSCvf36269 and CSCvg01089.");
  script_set_cvss_base_vector("CVSS2#AV:N/AC:M/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:N/AC:H/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-2019-1748");

  script_set_attribute(attribute:"exploitability_ease", value:"No known exploits are available");
  script_cwe_id(295);

  script_set_attribute(attribute:"vuln_publication_date", value:"2019/03/27");
  script_set_attribute(attribute:"patch_publication_date", value:"2019/03/27");
  script_set_attribute(attribute:"plugin_publication_date", value:"2019/07/26");

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

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

version_list=make_list(
  '3.9.2bE',
  '3.9.2S',
  '3.9.2E',
  '3.9.1aS',
  '3.9.1S',
  '3.9.1E',
  '3.9.0aS',
  '3.9.0S',
  '3.9.0E',
  '3.8.6E',
  '3.8.5aE',
  '3.8.5E',
  '3.8.4E',
  '3.8.3E',
  '3.8.2E',
  '3.8.1E',
  '3.8.0E',
  '3.7.7S',
  '3.7.5E',
  '3.7.4E',
  '3.7.3E',
  '3.7.2E',
  '3.7.1E',
  '3.7.0E',
  '3.6.9aE',
  '3.6.9E',
  '3.6.7bE',
  '3.6.7aE',
  '3.6.7E',
  '3.6.6E',
  '3.6.5bE',
  '3.6.5aE',
  '3.6.5E',
  '3.6.4E',
  '3.6.3E',
  '3.6.2aE',
  '3.6.2E',
  '3.6.1E',
  '3.6.0bE',
  '3.6.0aE',
  '3.6.0E',
  '3.5.3E',
  '3.5.2E',
  '3.5.1E',
  '3.5.0E',
  '3.3.5SE',
  '3.3.4SE',
  '3.3.3SE',
  '3.3.2XO',
  '3.3.2SE',
  '3.3.1XO',
  '3.3.1SE',
  '3.3.0XO',
  '3.3.0SE',
  '3.18.5SP',
  '3.18.4SP',
  '3.18.4S',
  '3.18.3bSP',
  '3.18.3aSP',
  '3.18.3SP',
  '3.18.3S',
  '3.18.2aSP',
  '3.18.2SP',
  '3.18.2S',
  '3.18.1iSP',
  '3.18.1hSP',
  '3.18.1gSP',
  '3.18.1cSP',
  '3.18.1bSP',
  '3.18.1aSP',
  '3.18.1SP',
  '3.18.1S',
  '3.18.0aS',
  '3.18.0SP',
  '3.18.0S',
  '3.17.4S',
  '3.17.3S',
  '3.17.2S ',
  '3.17.1aS',
  '3.17.1S',
  '3.17.0S',
  '3.16.7aS',
  '3.16.7S',
  '3.16.6bS',
  '3.16.6S',
  '3.16.5bS',
  '3.16.5aS',
  '3.16.5S',
  '3.16.4gS',
  '3.16.4eS',
  '3.16.4dS',
  '3.16.4cS',
  '3.16.4bS',
  '3.16.4aS',
  '3.16.4S',
  '3.16.3aS',
  '3.16.3S',
  '3.16.2bS',
  '3.16.2aS',
  '3.16.2S',
  '3.16.1aS',
  '3.16.1S',
  '3.16.0cS',
  '3.16.0bS',
  '3.16.0aS',
  '3.16.0S',
  '3.15.4S',
  '3.15.3S',
  '3.15.2S',
  '3.15.1cS',
  '3.15.1S',
  '3.15.0S',
  '3.14.4S',
  '3.14.3S',
  '3.14.2S',
  '3.14.1S',
  '3.14.0S',
  '3.13.9S',
  '3.13.8S',
  '3.13.7aS',
  '3.13.7S',
  '3.13.6bS',
  '3.13.6aS',
  '3.13.6S',
  '3.13.5aS',
  '3.13.5S',
  '3.13.4S',
  '3.13.3S',
  '3.13.2aS',
  '3.13.2S',
  '3.13.1S',
  '3.13.0aS',
  '3.13.0S',
  '3.12.4S',
  '3.12.3S',
  '3.12.2S',
  '3.12.1S',
  '3.12.0aS',
  '3.12.0S',
  '3.11.4S',
  '3.11.3S',
  '3.11.2S',
  '3.11.1S',
  '3.11.0S',
  '3.10.9S',
  '3.10.8aS',
  '3.10.8S',
  '3.10.7S',
  '3.10.6S',
  '3.10.5S',
  '3.10.4S',
  '3.10.3S',
  '3.10.2tS',
  '3.10.2aS',
  '3.10.2S',
  '3.10.1S',
  '3.10.10S',
  '3.10.0cE',
  '3.10.0S',
  '3.10.0E',
  '16.6.2',
  '16.6.1',
  '16.5.2',
  '16.5.1b',
  '16.5.1a',
  '16.5.1',
  '16.4.3',
  '16.4.2',
  '16.4.1',
  '16.3.5b',
  '16.3.5',
  '16.3.4',
  '16.3.3',
  '16.3.2',
  '16.3.1a',
  '16.3.1',
  '16.2.2',
  '16.2.1',
  '16.1.3',
  '16.1.2',
  '16.1.1'
);

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


reporting = make_array(
'port'     , 0,
'severity' , SECURITY_WARNING,
'version'  , product_info['version'],
'bug_id'   , 'CSCvf36269/CSCvg01089',
'cmds'     , make_list('show pnp profile')
);

cisco::check_and_report(product_info:product_info, workarounds:workarounds, workaround_params:workaround_params, reporting:reporting, vuln_versions:version_list);
  • NASL familyCISCO
    NASL idCISCO-SA-20190327-PNP-CERT-IOS.NASL
    descriptionAccording to its self-reported version, the installed Cisco IOS software is affected by a vulnerability in the Cisco Network Plug-and-Play (PnP) agent. This vulnerability allows an unauthenticated, remote attacker to gain unauthorized access to sensitive data. The vulnerability exists because the affected software insufficiently validates certificates. An attacker can exploit this vulnerability by supplying a specially crafted certificate to an affected device. A successful exploit allows the attacker to conduct man-in-the-middle attacks to decrypt and modify confidential information on user connections to the affected software. (CVE-2019-1748) 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
    last seen2020-06-01
    modified2020-06-02
    plugin id127049
    published2019-07-26
    reporterThis script is Copyright (C) 2019 and is owned by Tenable, Inc. or an Affiliate thereof.
    sourcehttps://www.tenable.com/plugins/nessus/127049
    titleCisco IOS Software Network Plug-and-Play Agent Certificate Validation Vulnerability
    code
    #TRUSTED 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
#
# (C) Tenable Network Security, Inc.
#

include("compat.inc");

if (description)
{
  script_id(127049);
  script_version("1.5");
  script_cvs_date("Date: 2019/12/20");

  script_cve_id("CVE-2019-1748");
  script_bugtraq_id(107619);
  script_xref(name:"CISCO-BUG-ID", value:"CSCvf36269");
  script_xref(name:"CISCO-BUG-ID", value:"CSCvg01089");
  script_xref(name:"CISCO-SA", value:"cisco-sa-20190327-pnp-cert");

  script_name(english:"Cisco IOS Software Network Plug-and-Play Agent Certificate Validation Vulnerability");
  script_summary(english:"Checks the version of Cisco IOS Software");

  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 installed Cisco IOS software is affected by a vulnerability in the
Cisco Network Plug-and-Play (PnP) agent. This vulnerability allows an unauthenticated, remote attacker to gain
unauthorized access to sensitive data. The vulnerability exists because the affected software insufficiently validates
certificates. An attacker can exploit this vulnerability by supplying a specially crafted certificate to an affected
device. A successful exploit allows the attacker to conduct man-in-the-middle attacks to decrypt and modify
confidential information on user connections to the affected software. (CVE-2019-1748)

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-20190327-pnp-cert
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?9f246a7b");
  script_set_attribute(attribute:"see_also", value:"http://tools.cisco.com/security/center/viewErp.x?alertId=ERP-71135");
  script_set_attribute(attribute:"see_also", value:"https://bst.cloudapps.cisco.com/bugsearch/bug/CSCvf36269");
  script_set_attribute(attribute:"see_also", value:"https://bst.cloudapps.cisco.com/bugsearch/bug/CSCvg01089");
  script_set_attribute(attribute:"solution", value:
"Upgrade to the relevant fixed version referenced in Cisco bug IDs CSCvf36269 and CSCvg01089.");
  script_set_cvss_base_vector("CVSS2#AV:N/AC:M/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:N/AC:H/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-2019-1748");

  script_set_attribute(attribute:"exploitability_ease", value:"No known exploits are available");
  script_cwe_id(295);

  script_set_attribute(attribute:"vuln_publication_date", value:"2019/03/27");
  script_set_attribute(attribute:"patch_publication_date", value:"2019/03/27");
  script_set_attribute(attribute:"plugin_publication_date", value:"2019/07/26");

  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) 2019 and is owned by Tenable, Inc. or an Affiliate thereof.");

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

  exit(0);
}

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

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

version_list=make_list(
  '12.1(12)',
  '12.1(1c)',
  '12.1(14)',
  '12.1(7)',
  '12.1(9)',
  '12.1(4a)',
  '12.1(3b)',
  '12.1(5b)',
  '12.1(6)',
  '12.1(4b)',
  '12.1(12a)',
  '12.1(11b)',
  '12.1(5)',
  '12.1(16)',
  '12.1(13)',
  '12.1(7b)',
  '12.1(13a)',
  '12.1(22a)',
  '12.1(24)',
  '12.1(17)',
  '12.1(5e)',
  '12.1(8)',
  '12.1(18)',
  '12.1(1)',
  '12.1(5c)',
  '12.1(6b)',
  '12.1(8a)',
  '12.1(8c)',
  '12.1(20)',
  '12.1(2b)',
  '12.1(17a)',
  '12.1(19)',
  '12.1(2)',
  '12.1(6a)',
  '12.1(22b)',
  '12.1(15)',
  '12.1(20a)',
  '12.1(26)',
  '12.1(10)',
  '12.1(4c)',
  '12.1(10a)',
  '12.1(21)',
  '12.1(22)',
  '12.1(11)',
  '12.1(12b)',
  '12.1(22c)',
  '12.1(9a)',
  '12.1(3)',
  '12.1(25)',
  '12.1(7c)',
  '12.1(4)',
  '12.1(3)XI',
  '12.0(5)S',
  '12.0(11)S6',
  '12.0(10)S',
  '12.0(11)S5',
  '12.0(2)S',
  '12.0(4)S',
  '12.0(6)S2',
  '12.0(7)S',
  '12.0(6)S',
  '12.0(6)S1',
  '12.0(11)S4',
  '12.0(10)S1',
  '12.0(10)S7',
  '12.0(28)S4a',
  '12.0(11)S3',
  '12.0(10)S3',
  '12.0(8)S',
  '12.0(10)S3b',
  '12.0(8)S1',
  '12.0(10)S4',
  '12.0(3)S',
  '12.0(10)S2',
  '12.0(11)S1',
  '12.0(10)S8',
  '12.0(9)S',
  '12.0(9)S8',
  '12.0(10)S5',
  '12.0(10)S6',
  '12.0(7)S1',
  '12.0(11)S',
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  '15.3(3)JF7',
  '15.3(3)JF35',
  '15.3(3)JF8',
  '15.3(3)JF9',
  '15.7(3)M',
  '15.7(3)M1',
  '15.7(3)M0a',
  '15.3(3)JG',
  '15.3(3)JG1',
  '15.3(3)JH',
  '15.3(3)JH1',
  '15.1(3)SVK4b',
  '15.1(3)SVK4c',
  '15.1(3)SVO1',
  '15.1(3)SVO2',
  '15.3(3)JI',
  '15.3(3)JI1',
  '15.1(3)SVP1'
);

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


reporting = make_array(
'port'     , 0,
'severity' , SECURITY_WARNING,
'version'  , product_info['version'],
'bug_id'   , 'CSCvf36269/CSCvg01089',
'cmds'     , make_list('show pnp profile')
);

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

References