Distributed Denial Of Service (DDOS) is the intentional paralyzing of a computer network by flooding it with data sent simultaneously from many individual computers (so-called zombies) which are used to stage DDOS attacks

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DDoS Solution for request floods [duplicate]

What are the mitigations to protect from ddos? Is using firewall like cloudflare would help or not? My use case is just want to make sure that no one is sending flood of requests i.e. thousands per ...
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some questions for my penetration testing [closed]

I would like to make a penetration test to my lab, is it possible to use upnp protocol in order to get behind my firewall (it blocks all ports, but lets only session to come in)? I would like to make ...
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Working around SYN flood attack [on hold]

I got the question: if my server is under a SYN flood attack, and no operating system level tuning will prevent it, such as Increasing Backlog, and I have 10 minutes before my server will stop ...
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How to do DNS query spoofing?

I was reading out OpenDNS amplification DDoS attack and it says attacker use DNS query spoofing redirected to Victim server. How do i do query spoofing, I wanted to test that in my LAB. is there any ...
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24 views

SYN Flood from fixed spoof IP but receive only one packet

Why i flood many packet to a victim from 1 fixed IP+Port. But on Victim i netstat see only one SYN_RECV packet
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286 views

Sophisticated DDOS attack

According to this article, ProtonMail was the victim of a very sophisticated DDOS attack. "At 2pm there was a dramatic escalation," said Yen. According to Yen and Gargula the attackers smacked 15 ...
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60 views

From a topological point of view, are there any network structures which weaken a DDoS attack?

I am aware that I am doing some abstractions here (link-layer-3/link-layer-2 and router topology comparison, for instance). However, I wonder if there are any network structures (so-called ...
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63 views

DDoS amplification attacks

I have been learning DDoS atacks and how to be protected from it. But I have a question: What are the common services being misused in UDP amplification DDOS attacks?
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58 views

If a firewall deletes DOS packets before they reach the designated application. Is it then possible to break trough the firewall with a DDOS attack?

My Question is that if a Firewall blocks for example a DOS attack of UDP packets. Is it then possible to "break" or take up the capacity of a server by sending enough packets trough a DDOS attack? or ...
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53 views

Rogue Containment on a wired network (mostly)

I work as a security analyst for a large company. The answer must provide remote support. We are currently looking to build a piece of software (integrating existing products with home grown ...
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1answer
40 views

Does using the same mail and web server increase a risk of DDos due to IP exposure?

I use the same server for sending my emails and web hosting. I send user registration and support forum mails from my server and occasional marketing mails or newsletters. I read on a CloudFlare blog ...
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Is there any way to stop DDOS attacks? [duplicate]

As many other webmaster I am facing problems with DDOS attacks. I have tried denying offending IP addresses from htaccess files and using bigger and better hosting, but I am unable to stop the attacks ...
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How to keep my VPS server up on Hulk.py attack

This question in not duplicated, I tried everything that was published on stackexchange websites, but could not fix my problem. I have a web server. OS: Ubuntu 15.10 Configured on Apache2 Ram: 1.5 GB ...
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1answer
74 views

Dealing with a DDoS: horizontal vs vertical scaling?

I'm reading this paper about DDoS protection in AWS. One of the benefits of EC2 is that depending on the instance, it can scale for minimizing the effect of the attack. In the paper there are two ...
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4answers
215 views

How can I remove an unknown device from my wifi network?

I have an OnHub (from Google), and there is a device I don't know on my wifi network. Is there some way for me to kick it, or DDoS it, whether through some command line command on windows or ubuntu, ...
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51 views

In house mitigation for a volumetric DDoS attack

Can a volumetric DDoS attack be mitigated by some in house defense or does the defense always need to be on the cloud? If yes, then why?
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51 views

Securing API against DDoS attacks

I have designed a backend service which is only accessible via a custom REST API. As I understand, services such as CloudFlare are designed to protect HTTPS traffic, and do not apply for custom APIs. ...
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57 views

Are link-flooding attacks a real threat or only an academic scenario?

I read some papers about link-flooding attacks (i.e. flooding network links) and I wonder if these attacks are really of relevance in the real-world and what makes them so dangerous compared to ...
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2answers
128 views

How hackers implemented DDoS attack with 602 Gbps?

Everybody's heard about DDoS attack with 602Gbps Bandwidth that crashed BBC site, But is really Botnets and hacked servers can implements an attack in this scale ?
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108 views

Wordpress pingback attack

I am getting Wordpress pingback attach on my server. I tried to put if condition on nginx to block deny all requests that contains "Wordpress" in the header. It works fine but still nginx get millions ...
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2answers
79 views

Preventing a web-page from getting hit from another server

A DDoS attack may result from a website attempting to access the resource of another website. For instance, example.com (attacker) is trying to access resources on example.net (victim). The ...
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1answer
118 views

How can CloudFlare save your website if the attacker knows the IP of the server?

I saw CloudFlare's services where you need to change the DNS of your domain name to their provided DNS address. The traffic coming as "mywebsite.com" goes through CloudFlare. What if I have a ...
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137 views

DDoS Mitigation - Whitelist or Blacklist Incoming SOURCE Ports?

For a network offering webservices, I have had recommendations to blacklist a couple of common incoming DESTINATION ports, such as UDP 53, to combat the increasing load from DDoS. I'm wondering if it ...
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CPU load of iptables to deny IPs during DDoS event [closed]

If a server has an external IP address protected with an iptables whitelist rule to reject all by default except from 3 ip addresses ip1, ip2 and ip3. If someone identifies this external IP address, ...
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43 views

How to find which domain in my VPS triggered a DDoS attack with WP xmlrpc

Today, my data center suspended my VPS for DDoS attack reasons. They say one of my clients, that has WordPress website, started a DDOS attack to another websites using xmlrpc. But I don't know which ...
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What is an Origin Error Attack?

Similar to my previous question here, however I thought it was best to ask two separate questions rather than combining them into one. From The Forrester Wave™: DDoS Services Providers, Q3 2015 ...
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What is a Poison Dart attack?

From The Forrester Wave™: DDoS Services Providers, Q3 2015 report, (emphasis mine): Attack types defended CGI request, denial of capability, diluted low rate degrading, direct, DNS ...
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240 views

Where can I get a list of “bad” IP addresses that are likely to be used by attackers or spammers? [closed]

Is there an open source project or a list of "bad" IP addresses or ranges that are likely to be used by attackers or spammers? UPDATE: ideally I want it to be a service call so I can call it using ...
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1answer
95 views

What's the best way to block all external proxy IP's which could be used for pivot points or as a DDOS Source?

At the simplest form - the question is to block external proxy due to an emergency situation due to which management have forced technical teams to get a solution to block all the external proxy or ...
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1answer
85 views

What is the role of IP spoofing in DDoS attacks?

I've read that IP spoofing is often used in denial of service attacks, and I've also just recently read about ingress filtering, which attempts to use blacklisting to filter out spoofed IP addresses ...
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60 views

Why is a DNS Amplification attack considered a DDoS attack?

My understanding is that a DNS Amplification attack involves sending a DNS resolver a bunch of requests with a spoofed sender address, which is the victims. The DNS responds to this IP address with a ...
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1answer
112 views

Must an attacker using a Smurf attack be on the same network as the victim?

I'm learning about Smurf Attacks. Since they need to use a broadcast address, doesn't that mean they can't work over the internet? For example if an attacker sends a router the packet with the ...
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589 views

What are the most popular DNS amplification attack tools for Windows and Linux?

I would like to test my edge-router firewall rules against some DNS amplification attack traffic. I could run some DNS lookup utility in an endless loop, but maybe there are some dedicated utilities ...
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64 views

How can perpertrators of denial of service attacks, determine the impact their attack has had?

Although I know how a user could mitigate Dos attacks and detect their presence e.g. checking packets received and sent, comparing current CPU usage to normal, comparing network usage to normal etc. ...
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43 views

Additional Protection Against DDoS

We have subscribed to an upstream ISP's protection service to protect against DDoS. I am thinking of developing a incident procedure in case my ISP's DDoS mitigation fails (highly unlikely right?). ...
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117 views

What danger can come from D-DoS over VPN

Every time I use VPN, I get a message to notify me to be sure that my PC is 'healthy' from pots infections. Also I've read in this article to stay away from that. My question, what damage could ...
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184 views

Why does an overload of requests give one root access all of a sudden?

There's this saying that using a DDOS-attack, people first attack a server using millions of concurrent requests and by doing that they miraculously gain access to the server. How does this work? Why ...
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218 views

Block this DDoS attack

since more than a week my dedicated server (located at ovh.com) has been under TCP SYN (I think) attack, ovh don't care about it but this attack is killing my server with a high CPU load (permanent ...
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1answer
162 views

DDoS Attack Protection

Recently I've been threatened with an IP Address DDoS attack. I was wondering in what ways and how could I stop this attack. I'd really like to be able to do this without my parents finding out.
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820 views

Digging into DDoS attacks (includes hostile IP's from multiple honeypots)

I have been tracing a series of DDoS attempts, and am wondering if anyone else has seen anything like them. I've downloaded the following Powershell script which scrapes Terminal Server (RDP) Event ...
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109 views

Deny IP spoof from on ASA destination

on Cisco ASA I am seeing lost of logs like following (127.108.61.90) to 190.93.249.93 on interface inside (127.30.171.61) to 190.93.249.93 on interface inside (127.105.54.108) to 190.93.248.93 on ...
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3answers
895 views

TCP versus UDP resilience to DDoS

I am building a service that I can implement equally well with either TCP or UDP. If I use TCP, I expose vulnerability to SYN flood and other attacks on TCP protocol. If I use UDP, it will be harder ...
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150 views

Common attacks when no ports are open

If you have a web server with all ports closed (except, of course, the necessary HTTP) what kind of attacks can an attacker use to hack into the system? Are the only vulnerabilities stuff like ...
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317 views

How can someone DDoS me?

If I've not opened the port 80, how can someone DDoS me? Is there a method or is it possible? Someone said that it's possible, but I'm not so sure, that's why I'm asking here.
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How do DoS attacks work on non-servers?

I understand how DoS/DDoS attacks work on servers. If I have not been misled, it is possible to DoS/DDoS a system that does not act as a server, but is still connected to the internet. How is this ...
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31 views

iptable ip_conntrack_max testing

I was trying to understand how ip_conntrack_max works so i have created two VM and set ip_conntrack_max to 10000 I used hping to open 10000 udp connection on VM using following command hping --udp ...
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445 views

TSource Engine Query DDoS attack

My gaming machine is under DDoS attack and when I used Wireshark I found the following string "TSource Engine Query" in all UDP packets coming from random IP's. I found using Google that some gaming ...
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231 views

Is a ddos attack that makes ssh auth attempts a possible way for attackers to significantly impact your system?

I'm noticing on my digital ocean server, that I'm getting a high volume of auth attempts. I don't have any passwords since I use sshe key auth, so I'm not worried about a break in. But can a ...
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232 views

How to Stop DDoS Attacks by simple function on web server?

I have an overview ideas of the preventing ddos attacks, in a simple way. Please clarify me, if my thinking is wrong. Option 1 From the basic understanding of the DDOS attacks is that the attacker ...
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296 views

Siri DDoS over FM Radio

A few days ago I was driving home and suddenly Siri started to talk by herself in reply to a command I never gave. As you can imagine I have the "hey siri..." feature active, so I can make calls ...