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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How to mitigate SSL based DDoS attacks?

as you probably know the problem with SSL based DDoS attacks is, that the traffic cannot be analysed and filtered by a DDoS mitigation service provider such as Prolexic, Akamai, Radware, etc. without ...
5
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3answers
3k views

My server is used for DDoS attacks

I have webserver (centos + cpanel), and one of the clients used my server for DDoS-ing, how can I identify that client/user? What logs should I look to, is there any settings I can modify so such ...
12
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4answers
8k views

Looking for botnet IP address feeds to protect against DDoS

I would like to get a live feed of botnet IP addresses delivered from a service and block them under certain conditions. Preferably community based/open source but open to looking at worthy commercial ...
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6answers
8k views

Why can't we block DNS Amplification attack by blocking UDP packets or DNS response packet?

I mean if the attacker tries to ask all the open DNS resolver respond to a web server. The web server can just block its UDP ports. If the all the DNS response go to a Authoritative ...
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1answer
2k views

dns reflection attack vs dns amplification attack

Over the past few weeks I have hard the discussion of a DNS reflection attack and a DNS amplification attack. Is there truly a difference between the two or are people just using 2 different names ...
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5answers
83 views

Does services provided by different companies for DDoS protection work well?

Is it necessary to use any DDoS service provided by different web hosting provider and other people? We know, they are running their business to provide security to thousands of web property. They are ...
12
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5answers
6k views

What is a DoS Attack and how does it differ from a DDoS attack?

Can some one explain to me the concept of Dos Attacks for web applications ? Also what is the distinction between Dos and Distributed Dos ( ie DDos) attacks ? Wikipedia says : In computing, a ...
1
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3answers
733 views

How does blacklisting an IP using a firewall protect against DDoS attacks?

I just read that to protecting a server against a DDoS attack involves blacklisting IP addresses. What does the term blacklisting mean? What does it mean for a firewall to drop a connection? How ...
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1answer
106 views

Different types of DDoS attacks [closed]

What is behavior of UDP flood, TCP SYN flood, Ping of Death and Smurf attack?
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0answers
47 views

Machine compromised [closed]

Recently, one of our GUI based jump box (ec2-instance) used for deployment to other ec2-machines got compromised, and was used for DDOS attack to other sites. Amazon reported abuse for the same. On ...
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0answers
103 views

VPN protection against DDoS [closed]

I am thinking of getting a VON, for DDoS protection and other various things, though what if an attacker knows my real IP already?
26
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5answers
3k views

DDOS - security or operational risk?

The chief security officer of a medium sized IT company (400-500 employees) recently released a bulletin in which he stated that DDOS attacks are not a security risk but an operational one. Also I was ...
0
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1answer
160 views

DDoS attacks targeting Android

I am currently studying some Android topics and I've been having difficulties finding answers regarding DDoS attacks. My question is: Are Android devices vulnerable to DDoS attacks or does Android ...
1
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0answers
14 views

Probabilistic packet marking content ID field

For Above image: All routers are using PPM. What will be the content ID field if 1) R1 = mark packet, R2= Mark packet, R3 = Not mark the packet. 2) R1 = Not mark packet, R2= Mark packet, R3 = Not ...
1
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1answer
151 views

What's the typical approach to caching invalid authentication attempts?

Clients (actually software pieces developed by some random dudes all over the Internet) are authenticating on a web server using "basic" authentication scheme and to do so they are passing the ...
0
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2answers
125 views

Hijack attacked SSL/TLS-connections?

I think we all heard the news that China used unencrypted HTTP-connections to drive DDoS attacks on targeted websites. Now within the last few months we've learned about three new attacks ...
18
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2answers
2k views

Web Developer's responsibility for DDoS [closed]

If my website is targeted for a DDoS attack after I have been paid for completing the website, and I get an angry phone call from the client regarding outage of service, what do I do? It hasn't ...
1
vote
2answers
55 views

unprivileged or privileged malware for botnets

For those malwares which are used to organize botnets to DDOS a website, they just need to send and receive HTTP packets. Do they need to be privileged? If they dont need to be privileged, is it true ...
10
votes
4answers
7k views

Can someone launch a DOS attack on my IP

Suppose, I have a static IP on my PC and is known to others. None of my softwares listen for remote connection. Is it still possible for someone to DOS attack me in such cases? If yes, how it is ...
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votes
1answer
139 views

What would a typical packet of a DDOS attack look like? [closed]

In terms of header, size and payload? We've been learning about DDOS attacks in class and they've been telling us all of the abstract ideas, but haven't told us what the actual makeup of the packets ...
6
votes
3answers
922 views

Can the IPS technology in a UTM prevent a DDoS attack?

Does a Unified Threat Management appliance (UTM) with Intrusion Prevention (IPS) enabled have the ability to prevent a DDoS attack? I have read some articles and none of them have a perfect ...
0
votes
1answer
642 views

Is there a layer 1, 2, 5 and 6 DDoS attack? [closed]

I'm doing some research on DDoS attacks, and I seem to only be finding information on layer 3,4 and 7 attacks. When I saw 3/4 and 7 DDoS attacks, I figured they were the most popular, but there were ...
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2answers
81 views

Hosting multiple websites on the same server - Prevention from DoS

I have an server which contains around 4 instances hosted on it. I am aware that if a DoS attack happens on one of the instances it will take down all the other instances too. How to prevent such a ...
2
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1answer
99 views

wordpress server visitor log contains a script, what's the risk?

I see this in my WP statistics: Is it safe to click on the link? Under what conditions will the script be triggered?
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0answers
42 views

Downloadable Autonomous System contact information

When under (a security) attack, it might be useful for the victim to first identify the source IP, then potentially contact the offending ISP. There seem to be plenty of tools for the part where an IP ...
0
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1answer
60 views

System backup in case of attack?

My system will be running for a well known insurance company within the UK, it will hold and process a lot of information for claims, brakdowns etc etc. I am worried that the company and the site as ...
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0answers
37 views

Slow internet, IP Flood? [duplicate]

Lately, I've been getting slow internet. I checked wireshark and noticed I keep receiving in matter of seconds thousands of UDP packets that my computer does not respond to, and here's the twist: ...
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1answer
125 views

Slow internet - Worried about spammed packets

got a weird question and I'm not sure if I should even post this on here but I couldn't think of anywhere better to ask. Lately, I've been getting some internet speed issues. I closed literally every ...
0
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1answer
170 views

Possible virus hogging bandwidth [duplicate]

My computer might have a virus infection. I have used Norton Internet Security and Power Eraser to scan the computer but it still did not work. The traffic on my PC looks like this I used resource ...
10
votes
3answers
542 views

External websites in logs [duplicate]

I have a website, let's call it www.good.com. I've been getting a lot of requests to www.good.com under completely different URLs than www.good.com. I suspect this traffic is also causing some site ...
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1answer
4k views

Am i getting DDOS attacked?

There has been some weird activity with my wifi router after somebody threatened to ddos me. I am looking at my wifi router's activity logs and i don't know what i am looking for. What happens is my ...
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1answer
69 views

Is DDOS more common than DOS?

Which attack takes place more often over the internet? I would have assumed DDOS due to the amount of botnets around today.
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2answers
146 views

Is this a DDOS attack?

I lost my internet connection for about 15 minutes and I checked my netgear router log and found these 3: [DoS Attack: ACK Scan] from source: 114.77.184.189, port 44822, Tuesday, March 24,2015 ...
0
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2answers
285 views

Udp ddos prevention

Okay,if i wanted to prevent a udp flood are these 2 solutions sufficient: -Say that i have only one port open like port 80 however i never use udp interactions what if i blocked the udp port leaving ...
2
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0answers
125 views

How can I launch DHCP starvation attack in WLAN?

In WLAN, due to MAC association on Access Point (AP), I can't send the DHCPDISCOVER messages using random MAC addresses. But if I keep my original MAC address as the source ethernet MAC a and random ...
8
votes
1answer
583 views

How is DDoS possible if you're not listening to the DoS traffic?

I've read about DDoS attacks and specially the amplification techniques. For example, the DNS amplification technique where you can send queries to open resolvers pretending to be the victim, then [if ...
0
votes
1answer
144 views

What are the repercussions of a DDoS attack on a website? [closed]

First of all, I'd like to know what exactly a DDoS attack is- my understanding is that it's a collection of infected or "zombie" computers, all controlled by a central computer, with the intent of ...
0
votes
1answer
98 views

DDoS Detection devices available in the market? [closed]

Wanted to know what DDoS detection devices are currently available in the market.My organisation has its dedicated firewalls and routers.But we wanted to know if there are any devices in the market ...
0
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1answer
127 views

Identifying attacks by network activity

Is it possible (and how) to tell from a network dump if there is a buffer overflow attack, DoS or brute force attack? A DDoS would be more obvious to identify, but those attacks mentioned above I ...
3
votes
2answers
403 views

If I send 4mbps of data to a friend with 4mbps connection, will I DDoS him?

Suppose my friend has a connection of 4mbps. If I just send him 4mpbs of random data with my server, wouldn't it block his connection? Even if the router has firewalls and closed ports, isn't enough ...
0
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1answer
120 views

rate limiting and access filter for web application

I had a requirement of rate limiting and dynamically access controlling access to web application dynamically I want to be able to rate limit access turned on / off dynamically black/white list ...
8
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3answers
7k views

Why is it so hard to trace origins of DDOS attacks?

According to the July 2009 cyber attacks Wikipedia article, US & South Korean governments suffered a DDOS attack on their websites. However, up till now they have not been able to find any ...
0
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2answers
164 views

Under constant ddos, even after switching 3 differnet routers? [closed]

I started getting ddosed when i pissed some minecraft nerd offt on some twitch chat, which he got banned from, and i never saw him again, but i moved to a hotel for about a week, and i kept getting ...
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2answers
125 views

Mitigating DDoS With Command of Ports

Is there any type of DDoS where closing or taking full control of all port capabilities would be useful in mitigation of an attack?
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1answer
2k views

Azure Based DDOS Mitigation, Azure Based Firewall?

I'd like to mitigate DDOS attacks, for an Azure vm server (just TCP ports 80 and 443). Azure appears to be a great solution. I can't find any Azure documentation, as to if there is an Azure ...
2
votes
1answer
116 views

Do the firewall hardware specifications have to be better than the network it protects?

If I need a bodyguard I'll have to hire someone whose muscles are much tougher than mine. If a server can't handle a DoS/DDoS attack because it consumes it's resources does this mean the firewall has ...
0
votes
0answers
330 views

Is there any method to prevent/trace ddos attack?

I have a debian linux server which run a few online game services. I have some competitors in this area and i think one of them is behind the ddos attacks. I have full access to the router, so I set ...
54
votes
6answers
23k views

What techniques do advanced firewalls use to protect againt DoS/DDoS?

It is hard to protect a server against Denial of Service attacks, DoS/DDoS. The two simple ways I can think of is to use a server with much resources (e.g. CPU and memory), and to build the server ...
5
votes
3answers
443 views

DoS by consuming all hosting trafic

Given a small website hosted on a small data plan, is it possible for someone to keep doing requesting for my website URL or just an image hosted on my website that will consume all my permitted ...
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votes
1answer
77 views

Mitigate DDos on Windows box

I would love to know, If you know some way to mitigate DDos/Dos attacks on Windows. In Linux we can Mitigate using the IPTables Almighty, but I wonder If there is something like that in Windows. ...