Vulnerabilities > CVE-2017-3883 - Allocation of Resources Without Limits or Throttling vulnerability in Cisco Firepower Extensible Operating System

CVSS 8.6 - HIGH

Attack vector

NETWORK

Attack complexity

LOW

Privileges required

NONE

Confidentiality impact

NONE

Integrity impact

NONE

Availability impact

HIGH

network

low complexity

cisco

CWE-770

nessus

NVD

Published: 2017-10-19

Updated: 2024-11-21

Summary

A vulnerability in the authentication, authorization, and accounting (AAA) implementation of Cisco Firepower Extensible Operating System (FXOS) and NX-OS System Software could allow an unauthenticated, remote attacker to cause an affected device to reload. The vulnerability occurs because AAA processes prevent the NX-OS System Manager from receiving keepalive messages when an affected device receives a high rate of login attempts, such as in a brute-force login attack. System memory can run low on the FXOS devices under the same conditions, which could cause the AAA process to unexpectedly restart or cause the device to reload. An attacker could exploit this vulnerability by performing a brute-force login attack against a device that is configured with AAA security services. A successful exploit could allow the attacker to cause the affected device to reload. This vulnerability affects the following Cisco products if they are running Cisco FXOS or NX-OS System Software that is configured for AAA services: Firepower 4100 Series Next-Generation Firewall, Firepower 9300 Security Appliance, Multilayer Director Switches, Nexus 1000V Series Switches, Nexus 1100 Series Cloud Services Platforms, Nexus 2000 Series Switches, Nexus 3000 Series Switches, Nexus 3500 Platform Switches, Nexus 5000 Series Switches, Nexus 5500 Platform Switches, Nexus 5600 Platform Switches, Nexus 6000 Series Switches, Nexus 7000 Series Switches, Nexus 7700 Series Switches, Nexus 9000 Series Switches in NX-OS mode, Nexus 9500 R-Series Line Cards and Fabric Modules, Unified Computing System (UCS) 6100 Series Fabric Interconnects, UCS 6200 Series Fabric Interconnects, UCS 6300 Series Fabric Interconnects. Cisco Bug IDs: CSCuq58760, CSCuq71257, CSCur97432, CSCus05214, CSCux54898, CSCvc33141, CSCvd36971, CSCve03660.

Vulnerable Configurations

Part	Description	Count
OS	Cisco Cisco Firepower Extensible Operating System - Cisco Firepower Extensible Operating System 1.1$1.86$ Cisco Firepower Extensible Operating System 1.1$1.160$ Cisco Firepower Extensible Operating System 1.1.1 Cisco Firepower Extensible Operating System 1.1.1.147 Cisco Firepower Extensible Operating System 1.1.1.160 Cisco Firepower Extensible Operating System 1.1.2.51 Cisco Firepower Extensible Operating System 1.1.2.178 Cisco Firepower Extensible Operating System 1.1.3 Cisco Firepower Extensible Operating System 1.1.3.84 Cisco Firepower Extensible Operating System 1.1.3.86 Cisco Firepower Extensible Operating System 1.1.3.97 Cisco Firepower Extensible Operating System 1.1.4 Cisco Firepower Extensible Operating System 1.1.4.95 Cisco Firepower Extensible Operating System 1.1.4.117 Cisco Firepower Extensible Operating System 1.1.4.140 Cisco Firepower Extensible Operating System 1.1.4.169 Cisco Firepower Extensible Operating System 1.1.4.175 Cisco Firepower Extensible Operating System 1.1.4.178 Cisco Firepower Extensible Operating System 1.1.4.179 Cisco Firepower Extensible Operating System 2.0.1 Cisco Firepower Extensible Operating System 2.0.1.37 Cisco Firepower Extensible Operating System 2.0.1.68 Cisco Firepower Extensible Operating System 2.0.1.86 Cisco Firepower Extensible Operating System 2.0.1.135 Cisco Firepower Extensible Operating System 2.0.1.141 Cisco Firepower Extensible Operating System 2.0.1.144 Cisco Firepower Extensible Operating System 2.0.1.148 Cisco Firepower Extensible Operating System 2.0.1.149 Cisco Firepower Extensible Operating System 2.0.1.153 Cisco Firepower Extensible Operating System 2.0.1.159 Cisco Firepower Extensible Operating System 2.0.1.188 Cisco Firepower Extensible Operating System 2.0.1.201 Cisco Firepower Extensible Operating System 2.0.1.203 Cisco Firepower Extensible Operating System 2.0.1.204 Cisco Firepower Extensible Operating System 2.0.1.206 Cisco Firepower Extensible Operating System 2.1 Cisco Firepower Extensible Operating System 2.1.1 Cisco Firepower Extensible Operating System 2.1.1.64 Cisco Firepower Extensible Operating System 2.1.1.73 Cisco Firepower Extensible Operating System 2.1.1.77 Cisco Firepower Extensible Operating System 2.1.1.83 Cisco Firepower Extensible Operating System 2.1.1.85 Cisco Firepower Extensible Operating System 2.1.1.86 Cisco Firepower Extensible Operating System 2.1.1.97 Cisco Firepower Extensible Operating System 2.1.1.106 Cisco Firepower Extensible Operating System 2.1.1.107 Cisco Firepower Extensible Operating System 2.1.1.113 Cisco Firepower Extensible Operating System 2.1.1.115 Cisco Firepower Extensible Operating System 2.1.1.116 Cisco Firepower Extensible Operating System 2.2 Cisco Firepower Extensible Operating System 2.2$1.58$ Cisco Firepower Extensible Operating System 2.2.1 Cisco Firepower Extensible Operating System 2.2.1.63 Cisco Firepower Extensible Operating System 2.2.1.66 Cisco Firepower Extensible Operating System 2.2.1.70 Cisco Firepower Extensible Operating System 2.2.2 Cisco Firepower Extensible Operating System 2.2.2.17 Cisco Firepower Extensible Operating System 2.2.2.19 Cisco Firepower Extensible Operating System 2.2.2.24 Cisco Firepower Extensible Operating System 2.2.2.26 Cisco Firepower Extensible Operating System 2.2.2.28 Cisco Firepower Extensible Operating System 2.2.2.54 Cisco Firepower Extensible Operating System 2.2.2.60 Cisco Firepower Extensible Operating System 2.2.2.71 Cisco Firepower Extensible Operating System 2.2.2.83 Cisco Firepower Extensible Operating System 2.2.2.86 Cisco Firepower Extensible Operating System 2.2.2.91 Cisco Firepower Extensible Operating System 2.2.2.97 Cisco Firepower Extensible Operating System 2.2.2.101 Cisco Firepower Extensible Operating System 2.2.2.137 Cisco Firepower Extensible Operating System 2.2.2.148 Cisco Firepower Extensible Operating System 2.2.2.149 Cisco Firepower Extensible Operating System 2.3 Cisco Fxos 2.3 Cisco NX OS 5.2 Cisco NX OS 6.2 Cisco NX OS 6.3 Cisco NX OS 7.3 Cisco NX OS 8.1 Cisco NX OS 8.2 Cisco NX OS - Cisco NX OS 1.0$1.110A$ Cisco NX OS 1.0$1E$ Cisco NX OS 1.0$2J$ Cisco NX OS 1.1$0.825A$ Cisco NX OS 1.1$1G$ Cisco NX OS 2.2 Cisco NX OS 2.3 Cisco NX OS 2.3.1.130 Cisco NX OS 2.4 Cisco NX OS 2.4.1.101 Cisco NX OS 2.4.1.122 Cisco NX OS 2.5 Cisco NX OS 3.0 Cisco NX OS 3.1 Cisco NX OS 3.1$1K$A Cisco NX OS 3.1$3A$A Cisco NX OS 3.2 Cisco NX OS 3.2$2B$ Cisco NX OS 3.2$3A$ Cisco NX OS 3.2$3D$C Cisco NX OS 3.2$3I$ Cisco NX OS 3.2$3J$ Cisco NX OS 3.2$3K$ Cisco NX OS 3.2$3O$ Cisco NX OS 3.2$B$ Cisco NX OS 4.0 Cisco NX OS 4.0$0$N1$1A$ Cisco NX OS 4.0$0$N1$2$ Cisco NX OS 4.0$0$N1$2A$ Cisco NX OS 4.0$1A$ Cisco NX OS 4.0$1A$A Cisco NX OS 4.0$1A$N1$1$ Cisco NX OS 4.0$1A$N1$1A$ Cisco NX OS 4.0$1A$N2$1$ Cisco NX OS 4.0$1A$N2$1A$ Cisco NX OS 4.0$1D$ Cisco NX OS 4.0$2A$ Cisco NX OS 4.0$2D$ Cisco NX OS 4.0$2E$ Cisco NX OS 4.0$4$Sv1$1$ Cisco NX OS 4.0$4$Sv1$2$ Cisco NX OS 4.0$4$Sv1$3$ Cisco NX OS 4.0$4$Sv1$3A$ Cisco NX OS 4.0$4$Sv1$3B$ Cisco NX OS 4.0$4$Sv1$3C$ Cisco NX OS 4.0$4$Sv1$3D$ Cisco NX OS 4.0$4H$ Cisco NX OS 4.0$4I$ Cisco NX OS 4.1 Cisco NX OS 4.1$1A$A Cisco NX OS 4.1$1C$ Cisco NX OS 4.1$1C$A Cisco NX OS 4.1$2$ Cisco NX OS 4.1$2$E1$1$ Cisco NX OS 4.1$2$E1$1A$ Cisco NX OS 4.1$2$E1$1B$ Cisco NX OS 4.1$2$E1$1C$ Cisco NX OS 4.1$2$E1$1D$ Cisco NX OS 4.1$2$E1$1E$ Cisco NX OS 4.1$2$E1$1F$ Cisco NX OS 4.1$2$E1$1G$ Cisco NX OS 4.1$2$E1$1H$ Cisco NX OS 4.1$2$E1$1I$ Cisco NX OS 4.1$2$E1$1J$ Cisco NX OS 4.1$2$E1$1K$ Cisco NX OS 4.1$2$E1$1M$ Cisco NX OS 4.1$2$E1$1N$ Cisco NX OS 4.1$2$E1$1O$ Cisco NX OS 4.1$2$E1$1R$ Cisco NX OS 4.1$3$ Cisco NX OS 4.1$3$N1$1$ Cisco NX OS 4.1$3$N1$1A$ Cisco NX OS 4.1$3$N2$1$ Cisco NX OS 4.1$3$N2$1A$ Cisco NX OS 4.1$3F$C Cisco NX OS 4.1$4$ Cisco NX OS 4.1$5$ Cisco NX OS 4.1.$2$ Cisco NX OS 4.1.$3$ Cisco NX OS 4.1.$4$ Cisco NX OS 4.1.$5$ Cisco NX OS 4.2 Cisco NX OS 4.2$1$ Cisco NX OS 4.2$1$N1$1$ Cisco NX OS 4.2$1$N2$1$ Cisco NX OS 4.2$1$N2$1A$ Cisco NX OS 4.2$1$Sv1$4$ Cisco NX OS 4.2$1$Sv1$4A$ Cisco NX OS 4.2$1$Sv1$4B$ Cisco NX OS 4.2$1$Sv1$5.1$ Cisco NX OS 4.2$1$Sv1$5.1A$ Cisco NX OS 4.2$1$Sv1$5.2$ Cisco NX OS 4.2$1$Sv1$5.2B$ Cisco NX OS 4.2$1$Sv2$1.1$ Cisco NX OS 4.2$1$Sv2$1.1A$ Cisco NX OS 4.2$1$Sv2$2.1$ Cisco NX OS 4.2$1$Sv2$2.1A$ Cisco NX OS 4.2$2$ Cisco NX OS 4.2$2A$ Cisco NX OS 4.2$3$ Cisco NX OS 4.2$4$ Cisco NX OS 4.2$6$ Cisco NX OS 4.2$8$ Cisco NX OS 4.2.$2A$ Cisco NX OS 5.0 Cisco NX OS 5.0$2$ Cisco NX OS 5.0$2$N1$1$ Cisco NX OS 5.0$2$N2$1$ Cisco NX OS 5.0$2$N2$1A$ Cisco NX OS 5.0$2A$ Cisco NX OS 5.0$3$ Cisco NX OS 5.0$3$A1$1$ Cisco NX OS 5.0$3$A1$2$ Cisco NX OS 5.0$3$A1$2A$ Cisco NX OS 5.0$3$N1$1$ Cisco NX OS 5.0$3$N1$1A$ Cisco NX OS 5.0$3$N1$1B$ Cisco NX OS 5.0$3$N1$1C$ Cisco NX OS 5.0$3$N2$1$ Cisco NX OS 5.0$3$N2$2$ Cisco NX OS 5.0$3$N2$2A$ Cisco NX OS 5.0$3$N2$2B$ Cisco NX OS 5.0$3$U1$1$ Cisco NX OS 5.0$3$U1$1A$ Cisco NX OS 5.0$3$U1$1B$ Cisco NX OS 5.0$3$U1$1C$ Cisco NX OS 5.0$3$U1$1D$ Cisco NX OS 5.0$3$U1$2$ Cisco NX OS 5.0$3$U1$2A$ Cisco NX OS 5.0$3$U2$1$ Cisco NX OS 5.0$3$U2$2$ Cisco NX OS 5.0$3$U2$2A$ Cisco NX OS 5.0$3$U2$2B$ Cisco NX OS 5.0$3$U2$2C$ Cisco NX OS 5.0$3$U2$2D$ Cisco NX OS 5.0$3$U3$1$ Cisco NX OS 5.0$3$U3$2$ Cisco NX OS 5.0$3$U3$2A$ Cisco NX OS 5.0$3$U3$2B$ Cisco NX OS 5.0$3$U4$1$ Cisco NX OS 5.0$3$U5$1$ Cisco NX OS 5.0$3$U5$1A$ Cisco NX OS 5.0$3$U5$1B$ Cisco NX OS 5.0$3$U5$1C$ Cisco NX OS 5.0$3$U5$1D$ Cisco NX OS 5.0$3$U5$1E$ Cisco NX OS 5.0$3$U5$1F$ Cisco NX OS 5.0$3$U5$1G$ Cisco NX OS 5.0$3$U5$1H$ Cisco NX OS 5.0$3$U5$1I$ Cisco NX OS 5.0$3$U5$1J$ Cisco NX OS 5.0$5$ Cisco NX OS 5.1 Cisco NX OS 5.1$1$ Cisco NX OS 5.1$1A$ Cisco NX OS 5.1$2$ Cisco NX OS 5.1$3$ Cisco NX OS 5.1$3$N1$1$ Cisco NX OS 5.1$3$N1$1A$ Cisco NX OS 5.1$3$N2$1$ Cisco NX OS 5.1$3$N2$1A$ Cisco NX OS 5.1$3$N2$1B$ Cisco NX OS 5.1$3$N2$1C$ Cisco NX OS 5.1$4$ Cisco NX OS 5.1$5$ Cisco NX OS 5.1$6$ Cisco NX OS 5.1.3 Cisco NX OS 5.2$1$ Cisco NX OS 5.2$1$N1$1$ Cisco NX OS 5.2$1$N1$1A$ Cisco NX OS 5.2$1$N1$1B$ Cisco NX OS 5.2$1$N1$2$ Cisco NX OS 5.2$1$N1$2A$ Cisco NX OS 5.2$1$N1$3$ Cisco NX OS 5.2$1$N1$4$ Cisco NX OS 5.2$1$N1$5$ Cisco NX OS 5.2$1$N1$6$ Cisco NX OS 5.2$1$N1$7$ Cisco NX OS 5.2$1$N1$8$ Cisco NX OS 5.2$1$N1$8A$ Cisco NX OS 5.2$1$N1$8B$ Cisco NX OS 5.2$1$N1$9$ Cisco NX OS 5.2$1$N1$9A$ Cisco NX OS 5.2$1$N1$9B$ Cisco NX OS 5.2$1$Sk3$1.1$ Cisco NX OS 5.2$1$Sk3$2.1$ Cisco NX OS 5.2$1$Sk3$2.1A$ Cisco NX OS 5.2$1$Sk3$2.2$ Cisco NX OS 5.2$1$Sk3$2.2B$ Cisco NX OS 5.2$1$Sm1$5.1$ Cisco NX OS 5.2$1$Sm1$5.2$ Cisco NX OS 5.2$1$Sm1$5.2A$ Cisco NX OS 5.2$1$Sm1$5.2B$ Cisco NX OS 5.2$1$Sm1$5.2C$ Cisco NX OS 5.2$1$Sm3$1.1$ Cisco NX OS 5.2$1$Sm3$1.1A$ Cisco NX OS 5.2$1$Sm3$1.1B$ Cisco NX OS 5.2$1$Sm3$1.1C$ Cisco NX OS 5.2$1$Sm3$2.1$ Cisco NX OS 5.2$1$Sv3$1.1$ Cisco NX OS 5.2$1$Sv3$1.2$ Cisco NX OS 5.2$1$Sv3$1.3$ Cisco NX OS 5.2$1$Sv3$1.4$ Cisco NX OS 5.2$1$Sv3$1.4B$ Cisco NX OS 5.2$1$Sv3$1.5A$ Cisco NX OS 5.2$1$Sv3$1.5B$ Cisco NX OS 5.2$1$Sv3$1.6$ Cisco NX OS 5.2$1$Sv3$1.10$ Cisco NX OS 5.2$1$Sv3$1.15$ Cisco NX OS 5.2$1$Sv3$2.1$ Cisco NX OS 5.2$1$Sv3$2.5$ Cisco NX OS 5.2$1$Sv3$2.8$ Cisco NX OS 5.2$1$Sv3$3.1$ Cisco NX OS 5.2$1$Sv3$3.15$ Cisco NX OS 5.2$1$Sv3$4.1$ Cisco NX OS 5.2$1$Sv3$4.1A$ Cisco NX OS 5.2$1$Sv3$4.1B$ Cisco NX OS 5.2$1$Sv5$1.1$ Cisco NX OS 5.2$1$Sv5$1.2$ Cisco NX OS 5.2$1$Sv5$1.3$ Cisco NX OS 5.2$1$Sv5$1.3A$ Cisco NX OS 5.2$1$Sv5$1.3B$ Cisco NX OS 5.2$3$ Cisco NX OS 5.2$3A$ Cisco NX OS 5.2$4$ Cisco NX OS 5.2$5$ Cisco NX OS 5.2$7$ Cisco NX OS 5.2$9$ Cisco NX OS 5.2$9$N1$1$ Cisco NX OS 5.2$9A$ Cisco NX OS 5.3.0 Cisco NX OS 6.0 Cisco NX OS 7.0 Cisco NX OS 7.0$3$I3$1$ Cisco NX OS 7.1$0.1$ Cisco NX OS 6.1	326
Hardware	Cisco Cisco Firepower 4100 - Cisco Firepower 9300 - Cisco MDS 9000 - Cisco Nexus 1000V - Cisco Nexus 1100V - Cisco Nexus 3000 - Cisco Nexus 3016 - Cisco Nexus 3016Q - Cisco Nexus 3048 - Cisco Nexus 3064 - Cisco Nexus 3064T - Cisco Nexus 3064X - Cisco Nexus 3500 - Cisco Nexus 3524 - Cisco Nexus 3548 - Cisco Nexus 2000 - Cisco Nexus 5000 - Cisco Nexus 5010 - Cisco Nexus 5010P Switch - Cisco Nexus 5500 - Cisco Nexus 5548P - Cisco Nexus 5548Up - Cisco Nexus 5596T - Cisco Nexus 5596Up - Cisco Nexus 5600 - Cisco Nexus 56128P - Cisco Nexus 5624Q - Cisco Nexus 5648Q - Cisco Nexus 5672Up - Cisco Nexus 5696Q - Cisco Nexus 6000 - Cisco Nexus 6001 - Cisco Nexus 6004 - Cisco Nexus 6004X - Cisco Nexus 7000 - Cisco Nexus 7000 10 Slot - Cisco Nexus 7000 18 Slot - Cisco Nexus 7000 9 Slot - Cisco Nexus 7700 - Cisco Nexus 9000 - Cisco 9500 R - Cisco UCS 6100 - Cisco UCS 6200 - Cisco UCS 6300 -	44

Common Weakness Enumeration (CWE)

CWE-770 - Allocation of Resources Without Limits or Throttling

Common Attack Pattern Enumeration and Classification (CAPEC)

Locate and Exploit Test APIs
An attacker exploits a sample, demonstration, or test API that is insecure by default and should not be resident on production systems. Some applications include APIs that are intended to allow an administrator to test and refine their domain. These APIs should usually be disabled once a system enters a production environment. Testing APIs may expose a great deal of diagnostic information intended to aid an administrator, but which can also be used by an attacker to further refine their attack. Moreover, testing APIs may not have adequate security controls or may not have undergone rigorous testing since they were not intended for use in production environments. As such, they may have many flaws and vulnerabilities that would allow an attacker to severely disrupt a target.
Flooding
An attacker consumes the resources of a target by rapidly engaging in a large number of interactions with the target. This type of attack generally exposes a weakness in rate limiting or flow control in management of interactions. Since each request consumes some of the target's resources, if a sufficiently large number of requests must be processed at the same time then the target's resources can be exhausted. The degree to which the attack is successful depends upon the volume of requests in relation to the amount of the resource the target has access to, and other mitigating circumstances such as the target's ability to shift load or acquired additional resources to deal with the depletion. The more protected the resource and the greater the quantity of it that must be consumed, the more resources the attacker may need to have at their disposal. A typical TCP/IP flooding attack is a Distributed Denial-of-Service attack where many machines simultaneously make a large number of requests to a target. Against a target with strong defenses and a large pool of resources, many tens of thousands of attacking machines may be required. When successful this attack prevents legitimate users from accessing the service and can cause the target to crash. This attack differs from resource depletion through leaks or allocations in that the latter attacks do not rely on the volume of requests made to the target but instead focus on manipulation of the target's operations. The key factor in a flooding attack is the number of requests the attacker can make in a given period of time. The greater this number, the more likely an attack is to succeed against a given target.
Excessive Allocation
An attacker causes the target to allocate excessive resources to servicing the attackers' request, thereby reducing the resources available for legitimate services and degrading or denying services. Usually, this attack focuses on memory allocation, but any finite resource on the target could be the attacked, including bandwidth, processing cycles, or other resources. This attack does not attempt to force this allocation through a large number of requests (that would be Resource Depletion through Flooding) but instead uses one or a small number of requests that are carefully formatted to force the target to allocate excessive resources to service this request(s). Often this attack takes advantage of a bug in the target to cause the target to allocate resources vastly beyond what would be needed for a normal request. For example, using an Integer Attack, the attacker could cause a variable that controls allocation for a request to hold an excessively large value. Excessive allocation of resources can render a service degraded or unavailable to legitimate users and can even lead to crashing of the target.
XML Ping of the Death
An attacker initiates a resource depletion attack where a large number of small XML messages are delivered at a sufficiently rapid rate to cause a denial of service or crash of the target. Transactions such as repetitive SOAP transactions can deplete resources faster than a simple flooding attack because of the additional resources used by the SOAP protocol and the resources necessary to process SOAP messages. The transactions used are immaterial as long as they cause resource utilization on the target. In other words, this is a normal flooding attack augmented by using messages that will require extra processing on the target.
XML Entity Expansion
An attacker submits an XML document to a target application where the XML document uses nested entity expansion to produce an excessively large output XML. XML allows the definition of macro-like structures that can be used to simplify the creation of complex structures. However, this capability can be abused to create excessive demands on a processor's CPU and memory. A small number of nested expansions can result in an exponential growth in demands on memory.

Nessus

NASL family	CISCO
NASL id	CISCO-SA-20171018-AAAVTY.NASL
description	According to its self-reported version, the Cisco NX-OS Software is affected by a vulnerability in the authentication, authorization, and accounting (AAA) implementation of NX-OS System Software that could allow an unauthenticated, remote attacker to cause an affected device to reload.
last seen	2020-06-01
modified	2020-06-02
plugin id	104177
published	2017-10-26
reporter	This script is Copyright (C) 2017-2019 and is owned by Tenable, Inc. or an Affiliate thereof.
source	https://www.tenable.com/plugins/nessus/104177
title	Cisco NX-OS System Software Authentication, Authorization, and Accounting Denial of Service Vulnerability Vulnerability
code	#TRUSTED 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 # # (C) Tenable Network Security, Inc. # include("compat.inc"); if (description) { script_id(104177); script_version("1.17"); script_cvs_date("Date: 2019/11/12"); script_cve_id("CVE-2017-3883"); script_bugtraq_id(101493); script_xref(name:"CISCO-BUG-ID", value:"CSCuq58760"); script_xref(name:"CISCO-BUG-ID", value:"CSCuq71257"); script_xref(name:"CISCO-BUG-ID", value:"CSCur97432"); script_xref(name:"CISCO-BUG-ID", value:"CSCus05214"); script_xref(name:"CISCO-BUG-ID", value:"CSCux54898"); script_xref(name:"CISCO-BUG-ID", value:"CSCvb93995"); script_xref(name:"CISCO-BUG-ID", value:"CSCvc33141"); script_xref(name:"CISCO-BUG-ID", value:"CSCvd36971"); script_xref(name:"CISCO-BUG-ID", value:"CSCve03660"); script_xref(name:"CISCO-BUG-ID", value:"CSCvf64888"); script_xref(name:"CISCO-BUG-ID", value:"CSCvg41173"); script_xref(name:"CISCO-SA", value:"cisco-sa-20171018-aaavty"); script_name(english:"Cisco NX-OS System Software Authentication, Authorization, and Accounting Denial of Service Vulnerability Vulnerability"); script_summary(english:"Checks the Cisco NX-OS Software version."); 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 Software is affected by a vulnerability in the authentication, authorization, and accounting (AAA) implementation of NX-OS System Software that could allow an unauthenticated, remote attacker to cause an affected device to reload."); # https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20171018-aaavty script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?b71cc502"); script_set_attribute(attribute:"solution", value: "Upgrade to the relevant fixed version referenced in Cisco Security Advisory cisco-sa-20171018-aaavty or use the referenced vendor workaround."); script_set_cvss_base_vector("CVSS2#AV:N/AC:L/Au:N/C:N/I:N/A:P"); script_set_cvss_temporal_vector("CVSS2#E:U/RL:OF/RC:C"); script_set_cvss3_base_vector("CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/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-2017-3883"); script_set_attribute(attribute:"exploitability_ease", value:"No known exploits are available"); script_set_attribute(attribute:"vuln_publication_date", value:"2017/10/18"); script_set_attribute(attribute:"patch_publication_date", value:"2017/10/18"); script_set_attribute(attribute:"plugin_publication_date", value:"2017/10/26"); script_set_attribute(attribute:"plugin_type", value:"combined"); script_set_attribute(attribute:"cpe", value:"cpe:/o:cisco:nx-os"); script_end_attributes(); script_category(ACT_GATHER_INFO); script_family(english:"CISCO"); script_copyright(english:"This script is Copyright (C) 2017-2019 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"); exit(0); } include("audit.inc"); include("global_settings.inc"); include("cisco_func.inc"); include("cisco_kb_cmd_func.inc"); device = get_kb_item_or_exit("Host/Cisco/NX-OS/Device"); model = get_kb_item_or_exit("Host/Cisco/NX-OS/Model"); version = get_kb_item_or_exit("Host/Cisco/NX-OS/Version"); # not affected if not MDS or Nexus if ('MDS' >!< device && 'Nexus' >!< device && 'UCS' >!< device) audit(AUDIT_HOST_NOT, "an affected device and/or model"); # Nexus models affected 1000V, 1100, 2000, 3000, 3500, 5000, 6000, 7000, 7700, 9000, 9500 R (handled below) # Also affected: # Nexus 9500 R-Series Line Cards and Fabric Modules # Unified Computing System (UCS) 6100 Series Fabric Interconnects # UCS 6200 Series Fabric Interconnects # UCS 6300 Series Fabric Interconnects # We do not have UCS Fabric devices, nor do we # know the banner. For now we are only checking them if # we are in paranoid mode. # the paranoid series checks are 1000, 2000, 2000, 5000, 6000, 7000, 9000/9500 # non-paranoid series checks are 1000, 2000, 3000, 5000, 6000, 7000 if (report_paranoia >= 2) { if (('Nexus' >< device && model !~ "^[1235679][0-9][0-9][0-9]([^0-9]\|$)$" && model !~ "^95[0-9][0-9]([^0-9]( R)?)[^0-9]\|$") && ('UCS' >< device && model !~ "^(61\|62\|63)[0-9][0-9]([^0-9]\|$)$") && ('MDS' >!< device)) { audit(AUDIT_HOST_NOT, "an affected device and/or model"); } } else { if (('Nexus' >< device && model !~ "^[123567][0-9][0-9][0-9]([^0-9]\|$)$") && ('MDS' >!< device)) { audit(AUDIT_HOST_NOT, "an affected device and/or model"); } } flag = FALSE; fix = NULL; override = FALSE; # Cisco Nexus 1000V Switch if ('Nexus' >< device) { if (model =~ '^1000V' \|\| model =~ "^11[0-9][0-9]") { if(version =~ "^([0-3]\.[0-9]\|4\.[0-2]\|5\.2)") fix = "See advisory"; } # Cisco Nexus 3000 else if (model =~ "^3[0-9][0-9][0-9]([^0-9]\|$)" && model !~ "^35[0-9][0-9]([^0-9]\|$)") { if(version =~ "^([0-5]\.[0-9]\|6\.0)") fix = "6.0(3)I6(1)"; else if(version =~ "^7\.0") fix = "6.0(3)I6(1)"; } # Cisco Nexus 3500 else if (model =~ "^35[0-9][0-9]([^0-9]\|$)") { if(version =~ "^([0-5]\.[0-9]\|6\.0)") fix = "6.0(2)A8(8)"; } # Cisco Nexus 2000, 5500, 5600, 6000 else if (model =~ "^5[56][0-9][0-9]([^0-9]\|$)" \|\| model =~ "^2[0-9][0-9][0-9]([^0-9]\|$)" \|\| model =~ "^6[0-9][0-9][0-9]([^0-9]\|$)") { if(version =~ "^([0-4]\.[0-9]\|5\.[0-2]\|[67]\.0\|7\.[1-3])") fix = "7.3(3)N1(1)"; } # Cisco Nexus 5000 else if (model =~ "^5[0-9][0-9][0-9]([^0-9]\|$)") { if(version =~ "^([0-4]\.[0-9]\|5\.[0-2])") fix = "See advisory"; } # Cisco Nexus 7000, 7700 else if (model =~ "^7[0-9][0-9][0-9]([^0-9]\|$)") { if(version =~ "^([0-4]\.[0-9]\|5\.[0-2]\|6\.[0-2])") fix = "6.2(20)"; else if(version =~ "^7\.2") fix = "7.2(3)D1(1)"; else if(version =~ "^7\.3") fix = "7.3(2)D1(2)"; else if(version =~ "^8\.0") fix = "8.0(2)"; else if(version =~ "^8\.1") fix = "8.1(2)"; else if(version =~ "^8\.2") fix = "8.2(2)"; } else if (report_paranoia >= 2) # Paranoid checks # Cisco Nexus 9500 R Series if (model =~ "^95[0-9][0-9]\s?R$") { if(version =~ "^7\.0") fix = "7.0(3)F3(1)"; } # Cisco Nexus 9000 else if (model =~ "^9[0-9][0-9][0-9]([^0-9]\|$)" && model !~ "^95[0-9][0-9]\s?R$") { if(version =~ "^6\.1\|7\.0") fix = "7.0(3)I6(1)"; } } # Cisco MDS else if ('MDS' >< device) { # 5.2 and 6.2 if(version =~ "^[56]\.2") fix = "6.2(23)"; # 6.3 and 7.3 else if(version =~ "^[67]\.3") fix = "7.3(1)DY(1)"; } # Paranoid checks for UCS else if (report_paranoia >= 2) { if('UCS' >< device) { if(version =~ "^([0-2]\.[0-9]\|2\.[0-2])") fix = "2.2(6c)"; else if(version =~ "^3\.0\|3\.1") fix = "3.1(2b)"; } } if (!isnull(fix) && (fix == "See advisory" \|\| cisco_gen_ver_compare(a:version, b:fix) < 0)) { flag = TRUE; } if (get_kb_item("Host/local_checks_enabled")) { if(flag) { flag = FALSE; buf = cisco_command_kb_item("Host/Cisco/Config/show running-config \| include aaa", "show running-config \| include aaa"); if (check_cisco_result(buf)) { if ("aaa" >< buf) { flag = TRUE; } } else if (cisco_needs_enable(buf)) override = TRUE; if (!flag && !override) audit(AUDIT_HOST_NOT, "affected because AAA is not configured"); } } if (flag \|\| override) { security_report_cisco( port : 0, severity : SECURITY_WARNING, override : override, version : version, fix : fix, bug_id : "CSCve03660/CSCvc33141/CSCus05214/CSCus05214/CSCuq71257CSCuq58760/CSCur97432" ); } else audit(AUDIT_HOST_NOT, "affected");

Summary

Vulnerable Configurations

Common Weakness Enumeration (CWE)

Common Attack Pattern Enumeration and Classification (CAPEC)

Nessus

References