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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Tracking IP address to prevent abuse without logging user metadata

I am trying to balance good security practices against excessive logging of user metadata / Personally Identifiable Information. I am constructing a web app that allows for secure messaging. In part ...
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DoS stress test not working [closed]

First off I'd like to say this is my first post on StackExchange, so please let me know if there's anything wrong with it. Also, I don't know much about networking and I'm just making a simple java ...
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Can older or custom web browsers override the same origin policy?

I totally understand the basis of origin policy and the reasoning why all modern browsers have put this policy into place. My question I guess is, do older browsers support this, and if they don't, ...
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How to send GET/POST requests without header and agent information

I want to test our DOS prevention system against http requests that are not have header and agent information. Is there any tool I can do that. I tried siege with this command siege -c 3 -b -H ...
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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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do ISPs implement security measures?

For example, if a user is receiving a denial of service attack, with huge amounts of packets being sent to him to disrupt his service, will the ISP notice and stop the offending traffic? Another ...
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Could John Oliver be (inadvertently?) launching DOS attacks?

Occasionally on his show, John Oliver points his viewers to the comments section of websites for companies/organizations that have done something putatively nefarious. For instance, when he pointed ...
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Google: “Unusual traffic from your computer network”

I often happen to receive the message: "Unusual traffic from your computer network" while googling in Russian speaking countries. Google explains this with: You may see "Our systems have ...
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507 views

How is DDoS different from DRDoS?

I understand DDoS is a DoS assault from multiple sources, where a coordinated stream of requests is launched against a target. How is DRDoS different?
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Secure against HTTP FLOOD ATTACK

What is the best way to defend your web site against HTTP FLOOD POST/GET ATTACK ?
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293 views

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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134 views

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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87 views

Is it possible to build a web-service which is immune to DOSes?

I heard that a service I'm using on the web has some problems with denial of service -attacks. I was wondering if it is theoretically possible to build a web-services where user can send data and ...
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How to avoid DDOS against Kerberos Authentication Server

I have a school project where i am supposed to implement a Kerberos based infrastructure (AS, TGS and resource server). It is already done and working, but i started thinking about how to protect the ...
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612 views

RESTful API URLs and Denial Of Service attacks

I overheard the following statement today: We shouldn't use /api (e.g. in a RESTful URL like /api/v1/users/get) in our RESTful URLs anymore because it makes it easier for people to Denial Of ...
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233 views

Possible DOS Attack? And solutions for it?

I don't know whether it's appropriate to post this question here but I desperately need help. I've been receiving ping requests from 18 different IP addresses so far. Some of them are local, some ...
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233 views

Which cloud providers can be used for the simulation of DDoS attacks? [closed]

Cloud providers have a great infrastructure to perform DDoS simulations. You can get thousands of virtual machines with different IP addresses, fully customizable with the tools you need for testing. ...
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120 views

How to know what's the type of an attack and from whom is sent?

I'm currently running a game server on a dedicated Windows 7 machine and it is being attacked. How do I know what kind of attack it is and from whom is sent? When he attacks, the RDP freezes and the ...
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164 views

Root/Naked domain and DDOS

Some services like Github has DDOS mitigation measures for their root/naked domain, but not other subdomain(s). What so special about the root domain concerning the DDOS attacks? [1] ...
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2k views

How to prevent DHCP Starvation attack?

All this while, I assumed that switchport security is enough to prevent DHCP dos attack. If I set it maximum 1, there can be no more mac addresses packets. But, a friend told me that using the tool, ...
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How to mitigate SIP Reflection Attacks?

SIP has a practical need to be widely available, but its services are prone to being spoofed as reflectors used in DDoS attacks. A freeswitch server I manage has seen heaps of registration requests ...
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Securing anonymous accessible URL with a GUID segment?

In my problem there is an existing system that works as a alerting or clipping service that runs user defined searches and generates results lists. These are setup by authenticated users and this ...
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7k views

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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63 views

Slow HTTP DoS Mechanics

Our firewall detected and blocked a Slow HTTP DoS the other day. There were only a few attempts in the log. It wasn't a full on attack (there would be more traffic). My question is...if I'm an ...
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Locking an enterprise account from an internet facing application

Some corporate applications are most useful when they are accessible from the internet. Outlook Web Access comes to mind. Those application usually have a user directory (usually LDAP) in the ...
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388 views

Are my Snort rules correct?

I am trying to do a Snort demo and I though it would be nice to detect a real threat. I picked the sasser worm and the jolt/teardrop dos attacks for the demo; no particular reason. Out of the three ...
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Using pattern matching to make a port more secure

I am planning to make a web application deployed on a port more secure by detecting the pattern of the request an then comparing it with the patern next time that IP tries to connect.Any ways to move ...
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126 views

What are some good ways to prevent a malicious visitor from maxing out our customer's API maximum allowed service calls?

We run an API service. We gave our customer a package for max limit of 12000 API calls / day. He reported to us that a user has been on purposely visiting his web page 12,000 times a day in order to ...
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735 views

Security implications of adding all domains to CORS (i.e. Access-Control-Allow-Origin: *) [duplicate]

I am curious of what all the security implications are if I set the following two HTTP response CORS headers; Access-Control-Allow-Origin: * Access-Control-Allow-Credentials: false The only ...
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130 views

What types of hacking attacks happen alongside a DOS or DDOS attack? [closed]

I'm trying to find some good material on this topic for a paper I'm trying to write for class. Any and all help is very much appreciated.
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282 views

Is a multitenant web app built on Apache Cassandra more resilient against DoS attacks?

Imagine a multitenant web app that stores data in a Apache Cassandra cluster, with fairly many nodes. Now assume that: Mallory launches a DoS attack against one tenant. (Perhaps that tenant is a ...
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46 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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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 ...
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DOS attack to increase packets received from a single request?

Is there any attack out there that can be implemented where a single request to a server i host for example responds by sending the same file say 20 times back ? the idea behind the attack is to DOS ...
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443 views

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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965 views

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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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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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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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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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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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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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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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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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 ...