Dos threats and countermeasures
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This document discusses denial of service (DoS) and distributed denial of service (DDoS) attacks, including examples of recent DDoS attacks and the terminology used. It covers different types of DoS attacks like TCP SYN floods and Smurf attacks. Countermeasures discussed include delayed binding, rate limiting, blackholing, sinkholing, and bogon filtering. Programming flaws exploited in DoS attacks and botnets are also mentioned.
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DDos
Distributed denial of service (DDOS) attacks aim to make computer or network resources unavailable. DDOS involves using bots, or infected computers controlled by an attacker, to flood a target with traffic. Common DDOS attacks include TCP SYN floods, which overwhelm a target with TCP connection requests, and Smurf attacks, which exploit IP broadcast addressing. Defenses against DDOS include rate limiting, intrusion prevention systems, blackholing traffic, and sinkholing or taking over botnets. Botnets are increasingly rented out to launch large scale DDOS attacks against targets like websites and payment processors.
Session for InfoSecGirls - New age threat management vol 1
This document discusses denial of service (DoS) and distributed denial of service (DDoS) attacks. It defines DoS and DDoS, describes common types like volumetric and application layer attacks. It also outlines tools used to carry out DDoS attacks and methods to protect against attacks, including configuring web servers and reverse proxies, using firewalls, and techniques from web application security firms.
DoS/DDoS
describes about DoS/DDoS attacks, popular methods of carrying the attack and some mitigation techniques.
Denial of Service Attacks (DoS/DDoS)
This is a presentation i made about Denial of Service or a Distributed Denial of Service (DoS / DDoS) and the latest methods used to crash anything online and the future of such attacks which can disrupt the whole internet . Such attacks which are in TB's and can be launched from just single computer. And, there is not much that can be done to prevent them.
denialofservice.pdfdos attacck basic details with interactive design
The document discusses denial of service (DoS) and distributed denial of service (DDoS) attacks. It defines DoS attacks as attempts to render a system unusable or slow it down for legitimate users by overloading its resources. DDoS attacks multiply the effectiveness of DoS by using multiple compromised computers to launch attacks simultaneously. Common DoS attack types like SYN floods, smurf attacks, and ping of death are described. The rise of botnets, which are networks of compromised computers controlled remotely, enable large-scale DDoS attacks that are difficult to defend against. Ways to mitigate DDoS attacks include load balancing, throttling incoming traffic, and using honeypots to gather attacker information.
Unleash the Hammer on Denial-of-Service: Conquer DDos Attacks!
Unleash the Hammer on Denial-of-Service: Conquer DDos Attacks!
This presentation cracks the code on devastating DDoS attacks, equipping you with insights and strategies to shield your systems and emerge victorious. Learn the devious tricks attackers use, explore robust defense mechanisms, and discover how to stay ahead of the curve in the ever-evolving cyber-warfare landscape. Prepare to turn the tables on malicious actors and ensure your operations run smoothly, even under siege!
Denial of service
This document discusses denial of service (DoS) and distributed denial of service (DDoS) attacks. It defines DoS attacks as attempts to render a system unusable or slow it down for legitimate users by overloading its resources. DDoS attacks multiply the effectiveness of DoS by using multiple compromised computers to launch attacks simultaneously. Common DoS attack types like SYN floods, Smurf attacks, and ping of death are described. The rise of botnets, which are networks of compromised computers controlled remotely, enabled more powerful DDoS attacks. Mitigation strategies include load balancing, throttling traffic, and using honeypots to gather attacker information.
DoS or DDoS attack
This document discusses denial of service (DoS) and distributed denial of service (DDoS) attacks. It defines DoS as making a machine or network unavailable to its intended users. DDoS uses other computers to launch the attack. Methods of attack mentioned include ICMP floods, teardrop attacks, and reflected/spoofed attacks. Signs of an attack include slow network performance. The document provides tips for system administrators and users, such as contacting providers and following security best practices, to mitigate attacks.
Computer Security Cyber Security DOS_DDOS Attacks By: Professor Lili Saghafi
DOS / DDOS introduction
How Easy it is to get information
Real Life Examples MyDoom , GitHub , Dyn , Windows Server and Windows 10 servers running Internet Information Services (IIS) are vulnerable to denial of service (DOS) attacks
Base of Attacks
Types of DOS / DDOS
Attack Tools , LOIC, XOIC, Stacheldracht
DOS/DDOS Weaknesses
Category of OS/ DDOS
What to defend?
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Michael Calce, a.k.a. MafiaBoy
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Layer one 2011-sam-bowne-layer-7-dos
The document discusses various types of denial of service (DoS) attacks including layer 4 distributed denial of service (DDoS) attacks using botnets, layer 7 attacks that can be carried out by a single attacker, and link local attacks using fraudulent IPv6 router advertisements. It also profiles various hacktivist groups that have carried out such attacks and outlines defenses against DoS attacks like ModSecurity, load balancing, and router advertisement guard.
Layer one 2011-sam-bowne-layer-7-dos
The document discusses various types of denial of service (DoS) attacks including layer 4 distributed denial of service (DDoS) attacks using botnets, layer 7 attacks that can be carried out by a single attacker, and link local attacks using fraudulent IPv6 router advertisements. It also profiles various hacktivist groups that have carried out such attacks and outlines defenses against DoS attacks like ModSecurity, load balancing, and router advertisement guard.
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The document discusses distributed denial of service (DDoS) attacks, including how they work, common tools and methods used, and examples of recent large-scale DDoS attacks. It provides details on how botnets are used to overwhelm websites and infrastructure with malicious traffic. Specific DDoS attack types like UDP floods, SYN floods, and reflection attacks are outlined. Recent large attacks are described, such as those targeting bitcoin exchanges, social trading platforms, and Hong Kong voting sites ahead of a civil referendum.
DDOS (1).ppt
This document discusses common denial of service (DoS) attacks and methods to mitigate them. It describes two common DoS attack methods: SYN floods which exploit TCP implementation and ping of death attacks using IP fragmentation. Distributed denial of service (DDoS) attacks are explained as using these methods from multiple compromised systems. Notorious DDoS attacks like Smurf and MyDoom are outlined. The document then discusses techniques to mitigate attacks like using access lists and network address translation (NAT). It provides examples of access list configuration and describes NAT's role in firewall capabilities and preventing spoofing and flooding attacks.
DrupalCon Vienna 2017 - Anatomy of DDoS
This document provides an overview of distributed denial of service (DDoS) attacks including:
- Common types of DDoS attacks like UDP floods, SYN floods, DNS floods and HTTP floods and how they work to overwhelm servers.
- How DDoS attacks are evolving to larger sizes and more complex botnets.
- Methods for mitigating DDoS attacks including black hole routing, rate limiting, web application firewalls, anycast networks and cloud-based DDoS protection services.
- A real example of mitigating a massive 400Gbps DDoS attack and the largest attacks seen to date.
DDOS Attack - Gurzu Nepal
Distributed Denial of Service, or DDoS is a cyber attack that makes a network, server, or a website unavailable by flooding it with traffic from multiple sources at the same time. In a DDoS attack, a large number of compromised devices or bots are used to flood the target system with traffic, disrupting its ability to function properly. This attack can result in serious consequences such as lost revenue, damaged reputation, and compromised security.
In the second chapter of Knowledge Ketchup at Gurzu, Engineer Aadit Shrestha talked briefly about DDoS attack.
DoS Attack - Incident Handling
This document discusses information security and denial of service (DoS) attacks. It begins with an agenda on information security incident handling. It then defines DoS attacks and explains they are aimed at availability, not confidentiality or integrity. It describes different types of DoS attacks including distributed denial of service (DDoS) attacks. The document outlines detection and analysis of DoS attacks as well as containment, eradication, recovery, and post-incident activities. It concludes with ways employees can help maintain network security.
Addios!
This document summarizes three papers related to data compression and network security. The first paper studies how improper implementation of data decompression in network services can enable denial-of-service attacks. It identifies 12 categories of flaws and evaluates popular services finding 10 vulnerabilities. The second paper proposes the Bohatei system to improve defense against DDoS attacks using SDN/NFV. It presents a hierarchical decomposition approach and proactive tag-based steering. The third paper examines data compression as a source of security issues, studying past attacks like zip bombs and analyzing pitfalls in design, implementation, specification and configuration of compression in network services.
Implementation Of real testbed of DDOS
This document describes the design and implementation of a DDoS testbed. It discusses various DDoS attack architectures and experimental techniques like mathematical models, simulation models, emulation models, and real-time models. The motivation for increasing DDoS attacks and a comparison of experimental techniques is provided. The document also outlines the hardware and software used in the testbed, including CORE emulator, Ubuntu, Apache web server, Wireshark sniffer, and attack tools like Hulk and HTTP Flooder. Finally, it discusses the future scope of detecting and defending against different types of DDoS attacks and measuring their impact.
Denial of services : limiting the threat
Presentation by Charl van der Walt at INFO SEC Africa 2001.
The presentation begins with a case study of a DoS attack launched on a number of high profile sites by the canadian teen "Mafiaboy". An explanation of DoS and DDoS given. The impact of DDoS in South Africa is also discussed. The presentation ends with a series of discussions on DDoS countermeasures.
Denial of service
This document discusses denial of service (DoS) attacks and distributed denial of service (DDoS) attacks. It defines DoS attacks as aiming to render a device unavailable by overwhelming it with requests. DoS attacks typically use a single computer, while DDoS attacks use many distributed sources. The document explains that DoS attacks work by buffer overflow or flooding the target with packets to oversaturate its capacity. It provides indicators that a computer may be experiencing a DoS attack and notes that the main difference between DoS and DDoS is that DDoS uses many infected sources in a botnet rather than a single source.
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Dos threats and countermeasures
- 1. DOS Threats and Countermeasure
- 2. DOS Attacks in news • Anonymous takes down formula1 website with ddos attack against the bahrain’s hosting the grand prix race. Source-jalopnik.com • DDOS attack on paypal,visa and mastercard against blocking the accounts of wikileaks.
- 3. Terminology-: • DOS,DDOS attack is an attempt to make computer or network resource unavailable to its intended users. • However, DDOS is something more artistic and involves the masters controlling bots which are then used to attack the network all together. • DRDOS i.e. distributed reflected DOS that involves spoofing the victim • Bots also known as zombies are infected computers under the control of attacker. • Botnet is the network of bots. • C&C server is known as command and control server.
- 5. Classification of DoS attacks-: Bandwidth consumption Local Resource starvation Programming flaws
- 6. Different types of DOS Attack TCP SYN attack TCP SYN flood sends a host more TCP SYN packets than the . protocol implementation can handle
- 7. Smurf attack • A smurf attack is an exploitation of the Internet Protocol (IP) broadcast addressing to create a denial of service.
- 8. Vulnerable HTTP Type of resource starvation attack Slow http response attack Exploiting the content-length field of the http request which is used to specify the length of message body in bytes. Slow Read basically sends a legitimate HTTP request and then very slowly reads the response, thus keeping as many open connections as possible and eventually causing a DoS.
- 9. DHCP Starvation & prevention • An idea to make dummy leased for all the IPs in DHCP range and will effectively cause the DOS to new connecting users that are trying to receive ip from DHCP.
- 12. Communicating bots • IP fast-flux which provides multiple IPs to a domain name and the IPs changing frequently. • Domain flux involves the use of DGA i.e.Domain Generation Algorithm .
- 13. Countermeasures • Delayed binding (TCP connection splicing) • Rate limiter • IPS and rate based IPS • Blackholing • Sinkholing • Clean Pipes • Bogon filtering, URPF i.e. unicast reverse path forwarding • Wan-link failover
- 14. Some more to know • Bots are available on rent pricing as $3 per day to $300 a week. • Zombies are also used for spamming but difficult to get blocked by DNSBLs. • Know hacking but no hacking.
- 15. References • http://en.wikipedia.org/wiki/Denial-of-service_attack ` • DDOS attack and countermeasure by Pier Luigi Rotondo • RioRey_Taxonomy_DDoS_Attacks_2.2_2011 • http://www.honeynet.org/node/132 • IEEE security and privacy magazine-volume9,number 1
Editor's Notes
- Bots on rent