Cisco NX-OS Software 802.1X Extensible Authentication Protocol over LAN Denial of Service (CVE-2019-1594)

#%NASL_MIN_LEVEL 80900
##
# (C) Tenable, Inc.
##

include('compat.inc');

if (description)
{
  script_id(501239);
  script_version("1.1");
  script_set_attribute(attribute:"plugin_modification_date", value:"2023/07/26");

  script_cve_id("CVE-2019-1594");

  script_name(english:"Cisco NX-OS Software 802.1X Extensible Authentication Protocol over LAN Denial of Service (CVE-2019-1594)");

  script_set_attribute(attribute:"synopsis", value:
"The remote OT asset is affected by a vulnerability.");
  script_set_attribute(attribute:"description", value:
"A vulnerability in the 802.1X implementation for Cisco NX-OS Software
could allow an unauthenticated, adjacent attacker to cause a denial of
service (DoS) condition on an affected device. The vulnerability is
due to incomplete input validation of Extensible Authentication
Protocol over LAN (EAPOL) frames. An attacker could exploit this
vulnerability by sending a crafted EAPOL frame to an interface on the
targeted device. A successful exploit could allow the attacker to
cause the Layer 2 (L2) forwarding process to restart multiple times,
leading to a system-level restart of the device and a DoS condition.
Note: This vulnerability affects only NX-OS devices configured with
802.1X functionality. Cisco Nexus 1000V Switch for VMware vSphere
devices are affected in versions prior to 5.2(1)SV3(1.4b). Nexus 3000
Series Switches are affected in versions prior to 7.0(3)I7(4). Nexus
3500 Platform Switches are affected in versions prior to 7.0(3)I7(4).
Nexus 2000, 5500, 5600, and 6000 Series Switches are affected in
versions prior to 7.3(5)N1(1) and 7.1(5)N1(1b). Nexus 7000 and 7700
Series Switches are affected in versions prior to 8.2(3). Nexus 9000
Series Fabric Switches in ACI Mode are affected in versions prior to
13.2(1l). Nexus 9000 Series Switches in Standalone NX-OS Mode are
affected in versions prior to 7.0(3)I7(4).

This plugin only works with Tenable.ot.
Please visit https://www.tenable.com/products/tenable-ot for more information.");
  script_set_attribute(attribute:"see_also", value:"http://www.securityfocus.com/bid/107325");
  # https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20190306-nx-os-lan-auth
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?7ec00caf");
  script_set_attribute(attribute:"solution", value:
"Refer to the vendor advisory.");
  script_set_cvss_base_vector("CVSS2#AV:A/AC:L/Au:N/C:N/I:N/A:C");
  script_set_cvss_temporal_vector("CVSS2#E:F/RL:OF/RC:C");
  script_set_cvss3_base_vector("CVSS:3.0/AV:A/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H");
  script_set_cvss3_temporal_vector("CVSS:3.0/E:F/RL:O/RC:C");
  script_set_attribute(attribute:"cvss_score_source", value:"CVE-2019-1594");

  script_set_attribute(attribute:"exploitability_ease", value:"Exploits are available");
  script_set_attribute(attribute:"exploit_available", value:"true");
  script_cwe_id(20);

  script_set_attribute(attribute:"vuln_publication_date", value:"2019/03/06");
  script_set_attribute(attribute:"patch_publication_date", value:"2019/03/06");
  script_set_attribute(attribute:"plugin_publication_date", value:"2023/07/25");

  script_set_attribute(attribute:"plugin_type", value:"remote");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:cisco:nx-os:13");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:cisco:nx-os:5");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:cisco:nx-os:6");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:cisco:nx-os:7");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:cisco:nx-os:8");
  script_set_attribute(attribute:"generated_plugin", value:"former");
  script_end_attributes();

  script_category(ACT_GATHER_INFO);
  script_family(english:"Tenable.ot");

  script_copyright(english:"This script is Copyright (C) 2023 and is owned by Tenable, Inc. or an Affiliate thereof.");

  script_dependencies("tenable_ot_api_integration.nasl");
  script_require_keys("Tenable.ot/Cisco");

  exit(0);
}


include('tenable_ot_cve_funcs.inc');

get_kb_item_or_exit('Tenable.ot/Cisco');

var asset = tenable_ot::assets::get(vendor:'Cisco');

var vuln_cpes = {
    "cpe:/o:cisco:nx-os:5.2%281%29sv3%281.4b%29" :
        {"versionEndExcluding" : "5.2%281%29sv3%281.4b%29", "family" : "NXOS"},
    "cpe:/o:cisco:nx-os:7.0%283%29i7%284%29" :
        {"versionEndExcluding" : "7.0%283%29i7%284%29", "versionStartIncluding" : "7.0%283%29i7", "family" : "NXOS"},
    "cpe:/o:cisco:nx-os:7.1%285%29n1%281b%29" :
        {"versionEndExcluding" : "7.1%285%29n1%281b%29", "family" : "NXOS"},
    "cpe:/o:cisco:nx-os:8.3%281%29" :
        {"versionEndExcluding" : "8.3%281%29", "versionStartIncluding" : "8.3", "family" : "NXOS"},
    "cpe:/o:cisco:nx-os:13.2%281l%29" :
        {"versionEndExcluding" : "13.2%281l%29", "family" : "NXOS"},
    "cpe:/o:cisco:nx-os:7.3%285%29n1%281%29" :
        {"versionEndExcluding" : "7.3%285%29n1%281%29", "versionStartIncluding" : "7.2", "family" : "NXOS"},
    "cpe:/o:cisco:nx-os:8.2%283%29" :
        {"versionEndExcluding" : "8.2%283%29", "versionStartIncluding" : "8.0", "family" : "NXOS"},
    "cpe:/o:cisco:nx-os:7.3%283%29d1%281%29" :
        {"versionEndExcluding" : "7.3%283%29d1%281%29", "versionStartIncluding" : "7.2", "family" : "NXOS"},
    "cpe:/o:cisco:nx-os:6.2%2820a%29" :
        {"versionEndExcluding" : "6.2%2820a%29", "versionStartIncluding" : "6.2", "family" : "NXOS"}
};

tenable_ot::cve::compare_and_report(asset:asset, cpes:vuln_cpes, severity:SECURITY_WARNING);