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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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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Mass account lockout prevention using CSRF tokens

I'm currently working on reducing the risk of mass account lockout on a site that (unfortunately) issues sequential, numeric user IDs. Changing the structure of the userID is not an option at this ...
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Could somebody explain connect loop DoS?

I'm trying to understand this vulnerability. How can I reproduce this?
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DoS and Serialization

I got the following message from Fortify static code analyser. Incorrect serialization and de-serialization can lead to unpredictable behavior and cause denial of service attacks. Can anyone ...
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Protection against account lockout DoS

Any ideas on how to protect against the following scenario? Company x uses active directory for authentication of it's employees. The company has multiple authentication points that are semi-public ...
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Can I trust the source IP of an HTTP request?

As far as I've understood, if you try to issue a HTTP request with a spoofed IP address, then the TCP handshake fails, so it's not possible to complete the HTTP request, because the SYN/ACK from the ...
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UDP Flood Attack false positive

Symantec keeps blocking traffic from the IP of my Comcast SMC Network gateway. It blocks traffic because it is detecting a UDP Flood Attack. According to the log the CPU usage is spiking to 100% when ...
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I think I accidentally DoS'd a website. What should I do?

I was browsing a website, and stumbled across a sample scheme for password-protecting web pages. The owner of the website specifically had a page that invited people to attempt to hack it. I wanted ...
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How to conduct DDoS attack practically? [duplicate]

Possible Duplicate: How to simulate DDoS attacks from the Internet? I want to conduct a DDoS attack. Can anyone please tell how can i conduct it? What are the latest DDos attacks? What are ...
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How does a DOS attack work when attacking a single server with a single client?

How is it possible to make a DOS attack from a single computer? Let us assume two computers, one acting as server and the other as client. Both has 100/100 mbit bandwitdh. How can then the client ...
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How do I protect my Windows computer against the IPV6 flood attack shown in this video

In the DefCon video "Three Generations of DoS Attacks (with Audience Participation, as Victims)", the speaker demonstrates how it is possible to crash a variety of devices by flooding them with IPV6 ...
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Is this a symptom of an attack (DoS/DDoS)?

I work for an e-commerce website in my country and this is the second time we suffer an attack. At least, looks like one. We have a search functionality in our website and the supposed attacker is ...
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Is this type of ARP poisoning attack possible?

I am wondering if it is possible to paralyze a network by sending out a bunch of fake ARP response packets. Some basis: I recently read a moderately detailed description of how ARP and ARP poisoning ...
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How are server overload and DoS/DDos different?

I know that server overloads are caused due to excessive number of genuine requests and DoS due to malicious request. But, my question is, if you have designed a system for Overload mitigation, does ...
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How to defend against SSL-Exhaustion attacks?

The problem of SSL-Exhaustion attacks is well known for years, but nobody really cared until THC released their exploit-tool recently. THC talks about counter measurements in their release: No real ...
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Combat Apache Killer

Three days ago, KingCope released a simple Perl script to DoS Apache, aptly named Apache Killer. This script launches about 50 threads to request Partial Content from the server with optional GZIP ...
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Why do sites implement locking after 3 failed password attempts?

I know the reasoning behind not letting infinite password attempts -- brute force attempts is not a meatspace weakness, but a problem with computer security -- but where did they get the number 3 ...
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What lessons about Denial of Service can we learn from Egypt's “experiment”?

Internet service was widely disrupted in Egypt starting Jan 27th at about 22:15 UTC, in the space of about 20 minutes: How Egypt Killed the Internet. Service was largely restored 5 1/2 days later on ...