6.1 Medium
CVSS2
Attack Vector
ADJACENT_NETWORK
Attack Complexity
LOW
Authentication
NONE
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
COMPLETE
AV:A/AC:L/Au:N/C:N/I:N/A:C
7.4 High
CVSS3
Attack Vector
ADJACENT
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
CHANGED
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
HIGH
CVSS:3.0/AV:A/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H
0.001 Low
EPSS
Percentile
25.0%
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.
#%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);
6.1 Medium
CVSS2
Attack Vector
ADJACENT_NETWORK
Attack Complexity
LOW
Authentication
NONE
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
COMPLETE
AV:A/AC:L/Au:N/C:N/I:N/A:C
7.4 High
CVSS3
Attack Vector
ADJACENT
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
CHANGED
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
HIGH
CVSS:3.0/AV:A/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H
0.001 Low
EPSS
Percentile
25.0%