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This advisory should be considered the single source of current, up-to-date, authorized and accurate information from NetApp.

Goodbye 3 5.2 Denial Of Service Tool Set

VMware OVF Tool 3.x 3.5.2 Multiple OpenSSL Vulnerabilities (VMSA-2014-0006) (Mac OS X) Medium Nessus Plugin ID 77331. Synopsis The remote Mac OS X host has an application installed that is affected by multiple vulnerabilities. Which could allow denial of service attacks. Note that this issue is exploitable only if SSLMODERELEASEBUFFERS. By Date By Thread. Current thread: net-snmp 5.7.3 unauthenticated remote Denial of Service (exploit available) Magnus Klaaborg Stubman (Oct 08) Re: net-snmp 5.7.3 unauthenticated remote Denial of Service (exploit available) Alexander Bergmann (Oct 08) Re: net-snmp 5.7.3 unauthenticated remote Denial of Service (exploit available) Salvatore Bonaccorso (Oct 09).

Summary

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2. DHCP Server 2.5.2 Denial Of Service. Change Mirror Download. #Exploit Title: DHCP Server 2.5.2 - Denial of Service (PoC). Security Tool (7,324) Shell (2,817.

StorageGRID (formerly StorageGRID Webscale) versions 10.0.0 through 11.3 prior to 11.2.0.8 and 11.3.0.4 are susceptible to a vulnerability which allows an unauthenticated remote attacker to cause a Denial of Service (DoS).

A distributed denial of service tool that is based on the 'stream.c' attack, this tool consists of a master controller and a zombie. The master controller control all zombies. An attacker uses Telnet to connect with the master controller to control zombies.

Impact

Successful exploitation of this vulnerability may allow an unauthenticated remote attacker to cause Denial of Service (DoS).

Vulnerability Scoring Details

Exploitation and Public Announcements

NetApp is aware of public discussion of this vulnerability.

Affected Products

• StorageGRID (formerly StorageGRID Webscale)

Products Not Affected

• 7-Mode Transition Tool
• AFF Baseboard Management Controller (BMC) - A700s
• ATTO FibreBridge
• Active IQ Unified Manager (formerly OnCommand Unified Manager) for Linux 7.3 and above
• Active IQ Unified Manager (formerly OnCommand Unified Manager) for VMware vSphere 9.5 and above
• Active IQ Unified Manager (formerly OnCommand Unified Manager) for Windows 7.3 and above
• Active IQ mobile app
• Brocade Fabric Operating System Firmware
• Brocade Network Advisor Software
• Cloud Insights Telegraf Agent
• Cloud Volumes ONTAP Mediator
• Clustered Data ONTAP
• Clustered Data ONTAP Antivirus Connector
• Data ONTAP operating in 7-Mode
• E-Series SANtricity Management Plug-ins (VMware vCenter)
• E-Series SANtricity OS Controller Baseboard Management Controller (BMC) - EF600A
• E-Series SANtricity OS Controller Software 11.x
• E-Series SANtricity Storage Manager
• E-Series SANtricity Web Services (REST API) for Web Services Proxy
• Element HealthTools
• Element Plug-in for vCenter Server
• FAS/AFF BIOS
• FAS/AFF Baseboard Management Controller (BMC)
• Host Utilities - SAN for Linux
• Host Utilities - SAN for Windows
• MAX Data
• MetroCluster Tiebreaker for clustered Data ONTAP
• NetApp Cloud Backup (formerly AltaVault)
• NetApp Cloud Backup OST Plug-in (formerly AltaVault OST Plug-in)
• NetApp Converged Systems Advisor Agent
• NetApp Data Availability Services
• NetApp E-Series Performance Analyzer
• NetApp Element System Firmware
• NetApp HCI Baseboard Management Controller (BMC) - H300S/H500S/H700S/H300E/H500E/H700E/H410S
• NetApp HCI Baseboard Management Controller (BMC) - H410C
• NetApp HCI Baseboard Management Controller (BMC) - H610C
• NetApp HCI Baseboard Management Controller (BMC) - H610S
• NetApp HCI Baseboard Management Controller (BMC) - H615C
• NetApp HCI Compute Node (Bootstrap OS)
• NetApp HCI Compute Node BIOS
• NetApp Manageability SDK
• NetApp NFS Plug-in for VMware VAAI
• NetApp Plug-in for Symantec NetBackup
• NetApp SANtricity Cloud Connector
• NetApp SANtricity SMI-S Provider
• NetApp SMI-S Provider
• NetApp Service Level Manager
• NetApp SolidFire & HCI Management Node
• NetApp SolidFire & HCI Storage Node (Element Software)
• NetApp SolidFire Baseboard Management Controller (BMC)
• NetApp SolidFire Plug-in for vRealize Orchestrator (SolidFire vRO)
• NetApp SteelStore Cloud Integrated Storage
• NetApp Storage Encryption
• NetApp VASA Provider for Clustered Data ONTAP 7.2 and above
• NetApp XCP NFS
• NetApp XCP SMB
• ONTAP Mediator
• ONTAP Select Deploy administration utility
• OnCommand API Services
• OnCommand Cloud Manager
• OnCommand Insight
• OnCommand System Manager 3.x
• OnCommand System Manager 9.x
• OnCommand Unified Manager for 7-Mode (core package)
• OnCommand Workflow Automation
• Open Systems SnapVault Agent
• RAID Controller CTS2600 Legacy Engenio
• SANtricity Unified Manager
• SAS Firmware
• Service Processor
• Single Mailbox Recovery
• Snap Creator Framework
• SnapCenter
• SnapCenter Plug-in for VMware vSphere
• SnapDrive for Unix
• SnapDrive for Windows
• SnapManager for Exchange
• SnapManager for Hyper-V
• SnapManager for MS SQL
• SnapManager for Oracle
• SnapManager for SAP
• SnapManager for Sharepoint
• SolidFire Storage Replication Adapter
• Storage Replication Adapter for Clustered Data ONTAP for VMware vSphere 7.2 and above
• Storage Replication Adapter for Clustered Data ONTAP for Windows 7.2 and above
• Storage Services Connector
• StorageGRID Baseboard Management Controller (BMC)
• StorageGRID Webscale NAS Bridge
• StorageGRID9 (9.x and prior)
• System Setup
• Trident
• Virtual Storage Console for VMware vSphere 7.2 and above

Software Versions and Fixes

NetApp's currently available patches are listed below.

Workarounds

None at this time.

Obtaining Software Fixes

Software fixes will be made available through the NetApp Support website in the Software Download section.

Customers who do not have access to the Support website should contact Technical Support at the number below to obtain the patches.

Contact Information

Check http://mysupport.netapp.com for further updates.
For questions, contact NetApp at:

Technical Support
mysupport.netapp.com
1 888 4 NETAPP (1 888 463 8277) (U.S. and Canada)
+00 800 44 638277 (EMEA/Europe)
+800 800 80 800 (Asia/Pacific)

Status of This Notice

Final.

This advisory should be considered the single source of current, up-to-date, authorized and accurate information from NetApp.

This advisory is posted at the following link:
https://security.netapp.com/advisory/NTAP-20200313-0005

Revision History

This document is provided solely for informational purposes. All information is based upon NetApp’s current knowledge and understanding of the hardware and software products tested by NetApp, and the methodology and assumptions used by NetApp. NetApp is not responsible for any errors or omissions that may be contained herein, and no warranty, representation, or other legal commitment or obligation is being provided by NetApp. © 2017 NetApp, Inc. All rights reserved. No portions of this document may be reproduced without prior written consent of NetApp, Inc.

A Denial of Service (DoS) attack is designed to cause service outages. These attacks can easily cost an organization a significant amount in damages and wasted resources, even if the attacker does not demand a ransom to stop the attack. A number of different free DDoS tools exist, making it cheap and easy for even unsophisticated attackers to use this attack technique.

What is a denial-of-service attack?

A DoS attack is any attack that is designed to take a system offline or make it unavailable to legitimate users. The goal of the attack could be to hurt the target organization, extort a ransom to allow services to be restored or cover up another attack.

DoS attacks can take advantage of a number of different vulnerabilities within a computer system. Buffer overflow vulnerabilities and other programming flaws can be exploited to cause a segmentation fault or other error that causes a program to crash.

However, the most common method of performing a DoS attack is to take advantage of bottlenecks within a computing system. Every component of a system has a maximum amount of traffic, data, connections and so on that it is capable of processing, and the entire system is limited by the component with the lowest threshold. Most DoS attacks are designed to exceed this maximum capacity, making it impossible for the system to process legitimate user requests.

DoS attacks can be performed in multiple different ways. Examples of common attack techniques include:

• Volumetric attacks: Network connections and network interface cards (NICs) have set bandwidth limitations. Volumetric attacks attempt to overwhelm these systems by sending more data than they can handle. These attacks may be composed of a massive number of small packets or a smaller number of very large ones.
• Protocol-level attacks: Computers have a set number of TCP and UDP port numbers allocated and cannot handle a new connection if no port is available. Protocol-level attacks attempt to consume all of a computer’s available connections, making it incapable of accepting new connections.
• Application-layer attacks: Applications communicating over the network need to be capable of processing the requests that they receive. In many cases, an application’s thresholds are much lower than the infrastructure that it runs on. By sending many legitimate requests to an application, an attacker can consume all of its available resources and make it unavailable to legitimate users.

DDoS or distributed denial-of-service attack

DoS attacks are designed to overwhelm a service with more traffic than it can handle. However, this assumes that the attacker has the resources necessary to achieve this.

Distributed DoS (DDoS) attacks are designed to ensure that the target is overwhelmed by taking a many-to-one approach to the attack. Instead of using a single machine to perform an attack, the attacker uses a botnet.

This botnet is composed of many attacker-controlled machines, including compromised computers, leased cloud infrastructure and more. Each of these machines is instructed to send some traffic to the target service. By taking advantage of its greater numbers, a DDoS botnet can take down any unprotected service, even if the target has more network bandwidth and better computers than the attacker.

Free DoS attacking tools

It’s possible for an attacker to write custom software to perform a DoS attack or malware to perform a DDoS attack, and many DDoS websites offer DDoS-as-a-Service. For penetration testers wishing to perform their attacks independently but don’t want to write their own tools, a number of free DoS attack tools exist.

1. LOIC (Low Orbit Ion Cannon)

LOIC is one of the most popular DoS attacking tools freely available on the internet. The famous hacking group Anonymous has not only used the tool, but also requested internet users to join their DDoS attacks via IRC.

LOIC can be used by a single user to perform a DoS attack on small servers. This tool is really easy to use, even for a beginner. This tool performs a DoS attack by sending UDP, TCP or HTTP requests to the victim server. You only need to know the URL or IP address of the server, and the tool will do the rest.

Image 1: Low Orbit Ion Cannon

You can see a snapshot of the tool above. Enter the URL or IP address, and then select the attack parameters. If you are not sure about what settings to use, you can leave the defaults. When you are done with everything, click on the big button saying “IMMA CHARGIN MAH LAZER”, and it will start attacking the target server.

This tool also has a HIVEMIND mode. It lets attackers control remote LOIC systems to perform a DDoS attack. This feature is used to control all other computers in your zombie network. This tool can be used for both DoS attacks and DDoS attacks against any website or server.

The most important thing you should know is that LOIC does nothing to hide your IP address. If you are planning to use LOIC to perform a DoS attack, think again. Using a proxy will not help you because it will hit the proxy server not the target server. This tool should only be used for testing the resiliency of your own systems against DoS and DDoS attacks.

2. XOIC

XOIC is another nice DoS attacking tool. It performs a DoS attack against any server if the user can provide an IP address, a target port, and a protocol to use in the attack. Developers of XOIC claim that XOIC is more powerful than LOIC in many ways. Like LOIC, it comes with an easy-to-use GUI, so a beginner can easily use this tool to perform attacks.

Image 2: XOIC

In general, the tool comes with three attacking modes. The first one, known as test mode, is very basic. The second is normal DoS attack mode. The last one is a DoS attack mode that comes with a TCP/HTTP/UDP/ICMP Message.

Download XOIC here.

3. HULK (HTTP Unbearable Load King)

HULK is another nice DoS attacking tool that generates a unique request for each and every request to the web server, making it more difficult for the server to detect patterns within the attack. This is only one of the ways in which HULK eliminates patterns within its attacks.

It has a list of known user agents to use randomly with requests. It also uses referrer forgery and can bypass caching engines; thus, it directly hits the server’s resource pool.

Download HULK here.

4. DDoSIM — Layer 7 DDoS Simulator

DDoSIM is another popular DoS attacking tool. As the name suggests, it is used to perform DDoS attacks by simulating several zombie hosts. All zombie hosts create full TCP connections to the target server.

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This tool is written in C++ and runs on Linux systems.

These are main features of DDoSIM

• Simulates several zombies in attack
• Random IP addresses
• TCP-connection-based attacks
• Application-layer DDoS attacks
• HTTP DDoS with valid requests
• HTTP DDoS with invalid requests (similar to a DC++ attack)
• SMTP DDoS
• TCP connection flood on random port

Download DDoSIM here.

Read more about this tool here.

5. R-U-Dead-Yet

R-U-Dead-Yet is a HTTP POST DoS attack tool. For short, it is also known as RUDY. It performs a DoS attack with a long form field submission via the POST method. This tool comes with an interactive console menu. It detects forms on a given URL and lets users select which forms and fields should be used for a POST-based DoS attack.

Download RUDY here.

Denial Of Service Tool Download

6. Tor’s Hammer

Tor’s Hammer is a nice DoS testing tool written in Python. It performs slow-rate attacks using HTTP POST requests.

This tool has an extra advantage: It can be run through a TOR network to be anonymous while performing the attack. It is an effective tool that can kill Apache or IIS servers in a few seconds.

Download TOR’s Hammer here.

7. PyLoris

PyLoris is said to be a testing tool for servers. It can be used to perform DoS attacks on a service. This tool can utilize SOCKS proxies and SSL connections to perform a DoS attack on a server. It can target various protocols, including HTTP, FTP, SMTP, IMAP and Telnet.

The latest version of the tool comes with a simple and easy-to-use GUI. Unlike other traditional DoS attacking tools, this tool directly hits the service.

Download PyLoris here.

8. OWASP Switchblade (formerly DoS HTTP POST)

OWASP Switchblade is another nice tool to perform DoS attacks. You can use this tool to check whether or not your web server is able to defend against DoS attacks. Not only for defense, it can also be used to perform DoS attacks against a website during a Red Team exercise.

Download Switchblade here.

9. DAVOSET

DAVOSET is yet another nice tool for performing DDoS attacks. The latest version of the tool has added support for cookies along with many other features. You can download DAVOSET for free from Packetstormsecurity.

Download DavoSET here.

10. GoldenEye HTTP Denial of Service Tool

GoldenEye is another simple but effective DoS attacking tool. It was developed in Python for testing DoS attacks.

Goodbye 3 5.2 Denial Of Service Tool Template

Download GoldenEye here.

Detection and prevention of denial-of-service attack

A successful DoS attack can cause significant damage to an organization’s operations. For this reason, it is important to have strategies and solutions in place to protect against them.

The first step in protecting against DoS attacks is minimizing the attack surface. One way to accomplish this is to deploy a network firewall with a restrictive allow/block list. This limits inbound traffic to protocols legitimately used by applications within the organization’s network and blocks any other traffic at the network border.

Anti-DoS tools are specialized solutions designed to identify and filter out attack traffic before it reaches the target service. This is accomplished by identifying features of the malicious traffic that differ from legitimate traffic. However, the increasing sophistication of DoS attacks makes this more difficult to perform.

The DDoS threat can also be decreased by denying attackers’ access to devices for use in their attacks. Botnets are commonly composed of computers, Internet of Things (IoT), and mobile devices that are compromised due to poor password security, lack of patching, or malware infections. Using strong passwords, installing security updates and using a trusted antivirus on all systems can help to limit the size of the botnets used in DDoS attacks.

Conclusion

Denial-of-service attacks can knock an organization’s systems offline and waste valuable resources on malicious traffic. This incurs significant costs for the target, even if the attacker doesn’t demand a ransom to stop their attacks.

The wide variety of free tools make it cheap and easy for cybercriminals to perform DoS and DDoS attacks, so every organization should have systems in place to protect against them. This is especially true as the growth of the Internet of Things and cloud computing make enterprise-scale attacks cheaper for attackers to perform.

Read more about DoS