Denial of Service is a family of attacks that attempt to force a target to use up resources (CPU time, memory, bandwidth etc) through flood a target with useless packets, connections or tasks

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Akamai or Incapsula (or other) for CDN with DDoS Protection? [closed]

One of our clients is launching a new site and I've been tasked with making a short overview of the advantages/disadvantages of Akamai, Incapsula or other CDN providers who are strong with DDoS ...
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SIP DoS classifications

I would like to understand below SIP DoS attacks Message Payload Tampering [implementation errors, SIP bugs] Flow Tampering [CPU, Bandwidth, Memory] Message Flooding [lack of authentication or ...
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Ping Of Death reconstruction against a Windows 95 virtual machine

For the sake of demonstration, I'm trying to perform a Ping Of Death sent from a Kali Linux virtual machine to a Windows 95 virtual machine (vmware) on a private network. I've set both vms correctly, ...
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Snort not showing dropped/blocked packets

This question is about SNORT- I m basically trying to detect PING FLOOD attack. I have included the rule**(drop icmp any any -> any any (itype:8; threshold, track by_src, count 20, ...
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Is anything written in the book “Internet Denial of Service: Attack and Defense Mechanisms” c2004 still valid? [closed]

I was reading through some of this book on google: http://books.google.ca/books?id=qmdCs_Jf2AEC It is uploaded to a hungarian website here: http://denialofservice.uw.hu/index.html I was reading... ...
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How a DOS TCP packet different from normal Packet?

a normal tcp packet shown in figure How a TCP packet that causes dos attack different from normal Tcp Packet?
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Is it possible to “close” a port by dos'ing it?

If I see port 25 is open, but I dont have access to the program running the smtp server, could It be flooded with enough information to make it unusable (but not affect any other services)?
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How to prevent Cookie-Bombs?

Egor Homakov made a nice writeup (Cookie Bomb or let's break the Internet) on how to crash CDNs and other websites with cookies. Although this is a user/browser-side DOS, I'm wondering how one would ...
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468 views

Can someone help? I'm getting Dossed!

So basically since a few days my internet started being very slow. I checked my router logs and guess what! In the log where it is a record of DoS attacks it showed something like |Description ...
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1answer
346 views

defend against LOIC Hive Mind attack

Other than client puzzles, what are some things a website can do to defend itself against a LOIC Hive Mind attack? The Low Orbit Ion Cannon (LOIC) is an attack tool which features a user-friendly GUI ...
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168 views

Wordpress: Thousand of mail sent to my site from an unknown user! Site is near to be blacklisted by Google

Recently an employee of mine developed a website in WordPress. Things were all fine until we received an email from Google , notifying me that some stuff that can really create security issues is ...
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SSL vs TLS, which is less vulnerable to DOS attacks?

When I learned TLS does not allow a connection to be created until it is has finished a secure handshake, i figured that would make it better for preventing DoS attacks. However, all I seem to find ...
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Requesting webpage as DOS

Is it possible to launch a DOS by repeatedly requesting a webpage (refreshing)? Like holding down F5 on your browser?
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DoS on an ordinary IP [duplicate]

So, I understand DoSing to an HTTP Server. I understand Layer 7 DoS attacks and how to even make these work. But what for an normal IP that isn't HTTP and is connected to the internet. Is the only ...
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1answer
85 views

To what extend can a DOS attack succeed even if it was detected?

While reading DOS detection and prevention http://staffweb.cms.gre.ac.uk/~lg47/publications/LoukasOke-DoSSurveyComputerJournal.pdf I've asked myself: Even if a firewall detects a DOS attack and begins ...
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763 views

How can I stop this attack on my router?

After enabling system log on my Asus DSL-N10E router, I've got this message: DoS: Tcp SYN With Data Attack source=217.74.166.73 What does it mean? Is it a real danger on my network security? And ...
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1answer
324 views

Preventing DoS in Ajax Calls

We have Ajax call to validate the UserID on create page so that user there only can know if their chosen ID is available or not. We have this URL exposed : https://mydomain.com/validateId?id=<user ...
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344 views

Denial Of Service attack in asynchronous communication

Is Low rate DOS attack (unintended) possible through asynchronous communication? Consider this scenario: I have a client server application were there is a WAN communication between the client and ...
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Looking for information about CVE-2006-6876 vulnerability

In order to study vulnerabilities of a SIP server and the impacts of DOS attacks on the QoS of VoIP service, I have found this vulnerability which can be exploited to cause DoS on SIP server. But I ...
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1answer
87 views

Organizing results from netstat using find on Windows [closed]

I am trying to figure out a way to natively do this within Windows without having to load any 3rd party applications. When I run: netstat -ba I want to find established connections without losing ...
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237 views

OWA + AD Lockout Policy: Quite the Mixture

Many organizations have webmail exposed to the world. These sites are often hooked up to AD for user authentication. Are there any specific security controls OWA (Outlook web app) has that would ...
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1answer
115 views

Finding the method of attack [closed]

My server has been repeatedly attacked in the last few days. Here's the observations: The ISP server traffic monitor shows the incoming traffic goes up to 300Mbps (with no outgoing traffic), and ...
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1answer
154 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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Is there some kind of a local DoS against processes?

Is there an attack that somehow floods a target process (e.g. by repeatedly calling a WinAPI function that involves the process) and thereby crashes or temporarily disables it?
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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 ...
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137 views

distinguish between bots and legitimate clients [closed]

If an attack (DoS & DDoS) involves thousands of bots, how can the server distinguish them from legitimate clients?
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124 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 ...
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295 views

what type of attack does LOIC do? [closed]

I have used LOIC (Low Orbit Ion Cannon) earlier . Today i was reading on wikipedia that there are many types of dos attacks , namely SYN attacks , HTTP flooding ,UDP flooding ,etc and two questions ...
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255 views

How can I test a DoS attack against snort?

I need to set up an scenario where an attacker DoS attacks port 80 of an server while snort and others users try to connect to port 80 at the same time. Something like this: 1000 connections to port ...
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2answers
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how to block ip from head or ping or get or post to webserver (using apache and windows)?

am using apache 2.4.9 latest with windows 7 i am using some modules like limitipconn_module security2_module but using wireshark i get unlimited request to busy my webserver (DOS) from some ip ...
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219 views

DoS anomaly-based detection: simplest approach beside simple threshold

As I learned, there is this technique in which the number of bytes/packets/frames of aggregated traffic is being checked to see if they deviate from a normal behavior. Then the time slot of that ...
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339 views

Differentiate normal flow and broadcast attacks

How do you identify whether a broadcast traffic is normal or is considered an attack such as a DoS attack?, There is some information that the plot or the source that allows me to differentiate ...
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1answer
195 views

802.11w protected management frames - Wi-Fi

I've been reading about protected management frames, introduced in 802.11w, and had a few questions. Apparently, a message integrity check is provided with de-authentication frames, allowing either ...
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360 views

API Key DDOS prevention method

Hi I just wanted some feedback on a DDOS preventing php script that I'm designing. It quite simple and I wanted some feedback on whether you guys think it would be effective. I'm currently using the ...
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Active Directory - Denial-of-Service [duplicate]

How can I prevent a user on the domain from launching a denial-of-service attack against Active Directory by scripting bad password attempts against every user in the domain?
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DoS and Hacking [closed]

Based on the top rated answer to this question: Is showing your IP address in the URL a bad practice? I'm curious to know if a DoS attack is consider 'hacking' or simply an 'attack.' I think ...
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1answer
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Can the attacker launch a sufficiently large SYN flood to overwhelm the victim's server?

Suppose that the victim's web server infrastructure can process 200,000 TCP connection requests per second. Assume that a single connection request (TCP initial SYN) requires 40 bytes to transmit. The ...
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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. ...
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1answer
133 views

Whose resources does Maltego Footprint L3 exhaust? Mine or target's?

Maltego Footprint L3 says: This perform a level 3 (intense) footprint on a domain. It takes a while and it eats resources. Use with care. Whose resources do they refer to? My resources or the ...
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2answers
432 views

Packet size and flood attacks

Do the attackers use small but a lot packets or big and some? e.g. 2 bytes or 512bytes? Also , can packet size affect the size/speed of the attack? Something more , how do the firewalls block dos ...
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If someone downloaded 600GB , can that be ddos attack [duplicate]

Last night some one exploit some vulnerability in my site and then upload php script in my images folder . I have the Amazon EC2 server with centos. Now the Hacker downloaded 600GB and increased my ...
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The best algorithm for defensing DOS attack [closed]

I am working on defensing Dos attack. I want to do it with Rate limiting filter. I have an Apache load balancer. I do not know about calculating the request or some algorithm in Rate limiting?
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1answer
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Recommendations for SMTP DoS [closed]

I have an opened SMTP server that allows me to send emails. The problem is that I can send a massive amount of emails (80,000+) to a specific mailbox and block all the other legitimate emails (that ...
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2answers
202 views

Why would you want to initiate a DoS attack on a system you are testing?

What is the value of a DoS attack as part of a security assessment? this is the question asked to me in EC council's exam preparation, so need to know. not intending any attack
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1answer
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Is there an exploit for python hash collision? [closed]

Is there an exploit for this vulnerability? EDIT Python DoS via hash algorithm collision - oCERT advisory 2011-003. Affected numerous languages. No CVE for Python but CVEs for other languages.
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1answer
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DoSing my Home Network with only a Public IP address [closed]

+--------------------------------------------------------+ | Client Host Name |.. IP Address ..|.... MAC Address ...| | Desktop-Home ....| 192.168.1.100 | 00:19:D1:EA:03:68 | | GT-S5380K ...
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How to detect if a website vulnerable to slow http dos attack [closed]

Is there any way to detect if a server/website is vulnerable to slow http dos attack without simulate an attack on it with dos scripts like 'slowhttptest'?