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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Best option for DDoS protection on DigitalOcean server?

I would not like to use CloudFlare since they effectively act as a man in the middle and handle unencrypted data. Is there a CDN that mitigates the security risks that CloudFlare imposes? If not, is ...
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Can CloudFlare be DDoS-ed and issn't the actual DDoS mitigation limit, financial resources?

CloudFlare (known for fighting DDoS-attacks) is explaining quite a lot about DDoS on their website cloudflare.com/ddos. In an article named The DDoS That Almost Broke the Internet they write about a ...
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How to perform a proper DDoS test in a safe and controlled way?

What is the proper and safe way to perform a DDoS test without crashing the whole infrastructure? What different types of DDoS attacks are there and what things should be considered performing such a ...
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21 views

How Common is the Microsoft ASN?

I'm working with a DDoS mitigation service, and it keeps track of the source ASN of what it considers an attack. Several times, a huge amount of traffic has come to one of my customers from an IP ...
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3k views

Does the amount of bandwidth available on a network determine how strong a DoS attack should be?

Does bandwidth alone determine how many packets a router or server can handle before the server is overran and then goes offline?
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65 views

Do a DoS where you permit only your own connection?

Yesterday I was discussing with my brother, a computer scientist, if it is posible to perform a Denial of Service on a webpage so you block all the traffic to the web but you allow your connection to ...
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55 views

Following strategy using DDoS mitigation service - UDP bandwith exhaustion attack from spoofed IPs

I need to defend against receiving a massive spam of UDP packets from random spoofed IP addresses. I would make it this way: In my protocol, every UDP packet contains username and password. Firewall(...
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259 views

What actual damage can a DDoS attack do?

Aside from not being reachable for actual customers and therefore financial loss, what damage (money/hardware/software) can a DDoS attack do? PS: I've read about streamers/youtubers/private gamers ...
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125 views

How to deal with UDP bandwidth exhaustion DDoS attacks?

I am building a service, which will use UDP. It will run on Amazon AWS - in the firewall they provide, I can block everything except that one UDP port my service will run. The only thing I'm ...
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2k views

What prevents me from launching an SYN-ACK flood using HTTP servers?

I've been studying networks lately and this issue came across my mind. What prevents me from sending a lot of SYN requests with source address of my (attack's) target and flooding the target's ...
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173 views

I am being DDoSed for no reason, how can I protect myself?

I recently experienced an unprovoked DDoS attack with a speed of 8Tbps against my website from over 80k unique IP addresses and I was wondering is there any way to protect myself against these attacks?...
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113 views

Repeated “Dos Attack” from remote IPs

I've been having some weird issues with a home network, and it seems to me like I have some vulnerability I don't know about. To be honest, though, I'm not a big network/security guy and I kind of ...
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55 views

What attack-methods for HTTP/L7-Attacks (Reflection and Co.) are you aware of [closed]

I know the following and would like to collect some more methods on how to attack websites and services via misused 3rd-party-applications: Wordpress PingBack/xmlrpc (seen a lot and wildly used) ...
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2answers
105 views

Should HSTS header be sent on an error response?

We need to configure our loadbalancer to send the HSTS header and we are debating whether or not to send the header on HTTP 4xx/5xx responses. Our main concern is application layer DDos attacks. We ...
129
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8answers
24k views

I got an email threatening to DDOS me if I don't pay a ransom. What should I do?

I received the following email, addressed to me at an email address on my personal domain (for which I run my own mail server on a VPS): FORWARD THIS MAIL TO WHOEVER IS IMPORTANT IN YOUR COMPANY ...
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40 views

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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39 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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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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63 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 graphlets/...
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1answer
80 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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64 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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61 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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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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114 views

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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88 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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638 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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69 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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82 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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2answers
148 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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157 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
83 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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216 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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148 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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81 views

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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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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183 views

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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383 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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109 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 ...
2
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1answer
136 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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1answer
75 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 victim's. The DNS responds to this IP address with a ...
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1answer
157 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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937 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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2answers
72 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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46 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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157 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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200 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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355 views

Can a Cisco ASA 5505 block this DDoS attack?

Since more than a week ago, 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 (...
3
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169 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.