Questions tagged [ddos]

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

Filter by
Sorted by
Tagged with
2
votes
1answer
53 views

DDoS Attack After Switching Hosts and Updating WordPress

I recently moved an old WordPress site from one hosting to Amazon Lightsail. Once the transfer was done, I noticed that WordPress, its plugins, and themes were all out of date. So, I updated them all. ...
1
vote
1answer
77 views

DDoS using websites instead of bots?

What if a ddos attacker hits public websites (google, amazon etc) with some requests but spoofed the souce ip to the victim's ip. Now the responses will be sent to the victim's ip. Attacker can rotate ...
0
votes
1answer
94 views

What is the traffic volume of practical DDoS attacks

I wonder what is the volume of traffic, in terms of requests/second, forms a legit DDoS attack against a website. I know it highly depends on the website and where it is hosted. But is there any real-...
1
vote
2answers
88 views

What is the most powerful type of DDOS/DOS attack? [closed]

What I mean is what protocol are best to DOS something like TCP, UDP, HTTP?
-1
votes
3answers
75 views

DDoS: calculating server threshold for requests

There's a question on infosec stack exchange here that is similar but not the same as what I want to know: Threshold for DDOS Attack I want to know how to calculate the amount of requests, and/or ...
0
votes
2answers
72 views

My VPS was used for DDOS Attacks [duplicate]

I got an email from my hosting provider telling me that my VPS was used to perform DDOS attacks on this website: cpanel4.vhosting-it.com. Unfortunately I haven't read their email sooner, so they ...
0
votes
1answer
86 views

Private REST API accessible only via SSH?

We are trying to bulletproof our server from DDoS / MIM etc. Use case: Clients (<5 in number) want to get some data from remote server Client open SSH connection to server, they can now access ...
0
votes
0answers
28 views

Why does a tool that analyses unidirectional traffic provide conditions for a Fake Session attack?

When I read this document about Fake Session Attack: Bearing in mind that today most networks have asymmetric traffic routing (in which incoming and outgoing packets are being sent via different ...
2
votes
2answers
79 views

Is there any working solution against large SYN Flood request?

Fighting against a large SYN Flood attack that is happening every 2 minutes repeatedly. During attack, number of syn-rcv is between 290-550 ss -n state syn-recv sport = :80 | wc -l CPU 100% (htop ...
1
vote
2answers
88 views

How to secure an email subscription endpoint?

I have a simple static webpage that lets users sign-up for a newsletter. Once they enter their email address, it gets sent to a public endpoint (AWS Lambda). This lambda function forwards the email ...
1
vote
0answers
54 views

How are memcached servers used to perform a DDoS attack?

If I understand it correctly memcached servers respond with a larger packet as response to a user request. I spoof my address to 1.1.1.0 (memcached servers). Now that I, masquerading as the memcached ...
0
votes
1answer
137 views

Server is sending large amounts of encrypted UDP traffic

The hosting company of a client has shut down their Windows server twice in the past week because the server seems to be sending out massive amounts of outbound encrypted UDP DNS traffic. I have now ...
0
votes
1answer
47 views

Calculate pps for DDoS evaluation

I am working on a task where I have to evaluate how much throughput one can generate in packets per second. I know I can send them as fast as possible with hping3 [...] --flood, but is there a way to ...
2
votes
1answer
227 views

Can we prevent DDoS or spam form submission with client authentication?

There is a public query form in my web app, and architecture team asking to authenticate the web app with OAuth2 like this, but I don't believe it will be of any help. I believe best way to protect ...
0
votes
0answers
49 views

.htaccess File Changed - Question About Possible Breach Or Default Defense Mechanism

Today I got reports about one of my websites becoming inaccessible. I've come to learn that at the time we were under DDOS attack. After getting through that, the website started throwing a ...
1
vote
1answer
82 views

Does a DDOS attack on an application using CDN have to first bring down all the involved CDN servers to affect the application's availability?

CDN are said to absorb and mitigate the Denial of Service and DDOS attacks. Consider an application that uses a CDN provider to deliver its content. So if an attacker tries to bring down such an ...
2
votes
1answer
107 views

Can someone perform DDoS on my VPS even if it is only accessible through SSH?

Can someone perform DDoS on my VPS even if I have not installed any webserver software like apache, nginx, etc.? Since I have not installed any webserver software, it's not really available to the ...
2
votes
1answer
170 views

What's the limiting resource that makes DDoS attacks possible?

I often see DDoS attacks compared by network traffic, for example: The biggest DDoS attack to date took place in February of 2018. This attack targeted GitHub, a popular online code management ...
1
vote
1answer
82 views

Protect Wordpress against ddos attack [closed]

The above screenshot is from my website's cpanel visitors list.My website is build on wordpress. And I think someone is trying hard to crack open my website with DDOS attack and drain out my 10gb ...
1
vote
0answers
51 views

What are spammers trying to acheive who only provide the correct contact information in their spam? [closed]

I've recently received 2 spam SMS messages, claiming to be from 2 different organizations, but (obviously) not sent by them. However, all of the contact details in the SMS match the real details of ...
6
votes
2answers
211 views

How does a CDN actually prevent DDoS attacks, when an origin server accepts direct connections?

I am trying to understand how a CDN (like Cloudflare e.g) does protect against a DDoS attack. I would think that the internet traffic is routed through a CDN's reverse proxy, then filtered. This ...
2
votes
2answers
311 views

How to protect Authentication API from a DDoS attacks?

After Login, severs can check authorization, tokens etc at API and WAF levels to mitigate DDoS attacks. But this can only happen after user has logged in. How can we protect DDoS attack on login API? ...
0
votes
1answer
131 views

How do attackers hit a website with thousands of similar but distinct IP addresses?

I have a website that is being hit with invalid URL requests by thousands of distinct IP addresses, never the same one used twice. Most of them are in a few ranges of IP addresses and often just go ...
1
vote
1answer
53 views

UDP amplification: length(response_packet) < length(request_packet)

I was researching the GitHub DDoS attack of 2018, in which memcached UDP amplification was used. I noticed that a GitHub blog post referenced a CloudFlare post which described memcached-based UDP ...
0
votes
0answers
32 views

Fundamental difference in security research in Cloud platform VM and normal machine

I am trying to study the effects of various network based attacks in an Openstack Cloud environment that I have setup with few machines. However, what would be the fundamental difference between a VM ...
-1
votes
4answers
141 views

DDoS implication on your network?

DDoS attack can be used to infiltrate your network for attackers to try to exploit the machines in the inner network ? Or it just attack that meant to disrupt the daily operation of a Network.
0
votes
1answer
74 views

Is it possible to DDos a http wan filterd router? [closed]

Like the service is there but it's just filterd enabled for lan access only .. what will happen ?
0
votes
1answer
4k views

My router is getting port scan attacks [duplicate]

My internet suddenly cut out yesterday, i checked the router and it looked like nothing is wrong. I looked at the logs and i see this 2019-08-18 12:50:39 Security Warning Detect UDP port scan ...
3
votes
2answers
207 views

How do I prevent traffic on my site from a source other than Cloudflare?

I use Google Cloud Platform to serve the site I manage. I have one load balancer there, which controls the movement to several virtual machines. When I came across the problem of DDOS attacks on ...
1
vote
1answer
43 views

Rate limiting API with PBKDF2 challenge?

Assume I have a public API endpoint which I'd like to protect against abuse. I'd like to implement a solution that ensures that the client spends some computational time before allowing the request to ...
0
votes
0answers
127 views

Unkown attack on linux server wordpress website

I have a WordPress site. Recently under a serious DDoS attack. For this WordPress site I use nginx, varnish and apache in the backend. A part of access log shows this: 24.41.213.36 - - [23/Jun/...
-3
votes
2answers
104 views

What's the main constituent part of botnet?

Is the botnet controlled broiler of servers or personal PCs? We know the botnet can be controlled to DDoS attack, but what's the main constituent part of botnet? I know the botnet's element maybe PC,...
1
vote
1answer
170 views

Why is GRE tunneling is needed when having a BGP based solution against DDoS?

I understand that GRE tunneling is very handy when sending the data back to the client after scrubbing because it's designed to ensure that the data is sent reliably by initiating a private point-to-...
1
vote
3answers
149 views

What can be done against DDoS attacks when I just have only small number of “known” clients reaching a server?

Description of the Situation: Let's say 1000 "known" clients/workers are collecting time-sensitive data from the field and sending to a server. Therefore, we need to secure the server from DDoS ...
4
votes
2answers
301 views

Why were hyperlink auditing pings used for DDoS attacks and not any other requests?

A few days ago this new story has been published: Researchers have found that the HTML feature called hyperlink auditing, or pings, is being used to perform DDoS attacks against various sites. This ...
-1
votes
1answer
144 views

Cloud based solution to prevent DDoS attack on multiplayer game server?

I built an architecture below: How does it work (and if it's possible) Assuming your game server currently runs on Node 1 and then Node 1 gets a successful DDoS attack. Your cloud system has ...
0
votes
1answer
202 views

519 tls handshake attempts in 3 seconds, with 415 within one second, was this a DDOS attack?

This morning our webserver was unresponsive to say the least. The connection was lost, the database connection we have was sluggish to say the least. I was forced to do a reboot via the remote hosting ...
5
votes
1answer
270 views

a mysterious & pointless long-term hacking attempt?

It seems that I am the target of a mysterious ongoing hacking attempt. I have several domain names, most of which are currently parked & pointed at a single ‘main’ website. For the last couple ...
2
votes
1answer
844 views

Thousands of 28000 “no pg_hba.conf entry for host” logs from Postgres - is this an attack?

Since yesterday afternoon my production Postgres database hosted on Amazon EC2 has been logging thousands of errors (averaging one or two per second) that all follow the format: sql_error_code = ...
5
votes
4answers
595 views

Public API security: authentication vs. rate limiting etc

We are raising a SaaS product that allows businesses to setup and orchestrate selling of a certain class of goods/services. This product has an API in its core and an ecosystem of various apps around ...
0
votes
0answers
27 views

Which metrics can be considered in the context of DDoS-similarity analysis?

What data should be collected if i want to bind two different DDoS-attacks? In example i want to build a model, which will calculate the similarity of two DDoS-attacks. The basic metrics should be: ...
0
votes
1answer
591 views

How did facebook DDoS me?

About 1 day ago my router was being DDoS by some people and one of the ip addreses was Facebook's. Can anyone explain this? [DoS Attack: ACK Scan] from source: 31.13.65.50, port 443, Saturday, ...
1
vote
4answers
2k views

What is the difference between an SYN-Flood attack and an SYN-ACK-Flood attack?

What is the difference between an SYN-Flood attack and an SYN-ACK-Flood (SYN Reflection) attack?
1
vote
1answer
135 views

How does IP traceback works? [closed]

In part prompted by the difficulties in determining the true origins of DDOS attacks featuring spoofed IP addresses, researchers have attempted to develop the concept of IP traceback: determining ...
1
vote
1answer
76 views

Blockchain + shared unused bandwidth as the proxy front = ddos mitigated?

Pentesting the new webapp that we have developed before having an external source have a go at it and give us a risk assessment. Now we have come to the portion right at the end; DDOS. For the most ...
1
vote
2answers
383 views

How fill up a gig interface bandwidth with hping3?

I've been trying to test our software against DOS attacks. So, I used 'HPing3' but it just fills up 10-11M of my interface's bandwidth! I ran the tool 40 times, I mean 40 hping3 processes, ...
1
vote
2answers
178 views

Please help diagnose multiple incoming packets

We have an internet-facing router and it is significantly slowed down. We investigated the network traffic and came up with following information: All the packet size is same (i.e. 40 bytes) All ...
0
votes
2answers
197 views

Website is behaving strangely - was it attacked?

Our website was behaving strangely. Sometime it was down and nothing was accessible. Sometime it started loading but pages browsing was too slow. We checked apache logs and found the below ...
7
votes
1answer
366 views

Do major ISPs still ignore IP spoofing?

I was reading this question: Why don't ISPs filter on source address to prevent spoofing? and based on those answers, ISPs ignore it because of the overhead of checking for spoofing. But that ...
1
vote
1answer
93 views

How link flooding DDoS attack remain undetected?

I read some explains or paper about link flooding DDoS attack, which is new relatively. For example "employs legitimate, low-density flows to flood a group of selected links. Therefore, these ...

1
2 3 4 5
9