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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What type of attacks will a SMTP server face if it does not have ratelimiting while sending mails?

Assume a web site with some kind of mailer option, that doesn't implement any rate limiting: This enables users to send an unlimited amount of email per second. Will SMTP face possible DoS attacks ...
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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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126 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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3answers
59 views

Security considerations in concurrent applications

I have been building a network application with a Client/Server model, where a central server handles multiple client threads. I did my best to ensure that no matter what context the program is run ...
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389 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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165 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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477 views

What is DDOS TCP KILL?

I've recently been introduced to Kali Linux's webkiller tool, located in the websploit category. It works on the concept of Tcpkill. I don't understand how the DoS attack with Tcpkill works. Can ...
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377 views

De-auth attack Reason codes and possible reaction

I am learning about Deauth attacks and how they work. I see that the Deauth frame has a reason code which indicates the reason for the deauth. I have tested the attack with aircrack-ng and this reason ...
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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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105 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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outbound ICMP allow or not [duplicate]

What is you opionion to allow outbound ICMP from the networks?? I saw many opionios on this.. on one hand is usefull troubleshooting tool on other hand many DOS attacks are based on ICMP not speaking ...
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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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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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268 views

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 ...
6
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1answer
585 views

Harden a server against mass SSH DoS attacks

How can a Linux server be protected against an attacker that tries to open a large number of SSH sessions (probably trying to brute force a password) that no ports remain to be able to legitimately ...
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79 views

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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214 views

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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126 views

DOS safe alternative to delay response to an attacker with sleep()?

tl;dr sleep() costs my servers resources. Using it to delay response to the attacker might cost him/her time, but allows for DOS. Is it possible to keep him/her waiting without costs of mine? Long ...
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188 views

How to force “expensive calculation” when clients connect to my server?

Page 183 of Secrets & Lies on countering denial-of-service attacks: Some researchers have proposed defenses that force the client to perform an expensive calculation to make a connection. ...
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324 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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Does Windows 7 have built in wifi deauthentication attack protection?

I'm testing a wifi de-authentication attack and it looks like my Windows 7 client is not getting kicked off the network during the deauthentication. Any explanations as to why that might be? I've got ...
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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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966 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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First steps in preventing DOS attacks

My server is currently being attacked from another server. This is my log: root@my-server:/var/log# tail -f auth.log Feb 19 11:53:08 my-server sshd[3745]: Disconnecting: Too many authentication ...
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613 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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How to detect bots clicking a link?

I own a url shortening service. I want to deliver only legitimate statistics to my clients. There are possible scenarios that a particular user writes a script to automatically open the shortened URL, ...
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Zlib DEFLATE decompression bomb

Can you give me an example of a short data string that, when decompressed using Zlib's DEFLATE method, expands to something much much longer? More precisely: what is the nastiest decompression bomb ...
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327 views

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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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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82 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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340 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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400 views

How does a Distributed Denial Of Service Attack work

Let's assume that a hacker has already infected an X number of PCs , each one of them is online. How will he actually perform this attack? Just send ping requests or use his very precious tool to do ...
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Anti-DoS WebSockets Best Practices

What are the best practices for thwarting DoS attacks for a WebSocket server? Is there a comprehensive site or document that can be referenced?
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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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658 views

How dangerous is it to allow arbitrary webhook urls to post to?

I am building a Ruby on Rails API that posts to webhooks that the API user can create, whenever a resource that he manages is created, updated or destroyed, using the HTTParty gem. This got me ...
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508 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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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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677 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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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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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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Why would Tor not be vulnerable to this easy-sounding attack?

I'm thinking of this attack on Tor, which I'm sure won't work, as it is much too simple. Mr. Blackhat sets up lots of intermediate nodes. However, whenever TCP connections come in, they are given ...
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TCP syn attack prevention

I am new to implementing information security. However i am trying to harden a windows server.I am using regedit to create parameters like SynAttackProtect,TcpMaxHalfOpen and TcpMaxHalfOpenRetried and ...
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nf_conntrack: table full, dropping packet

I see a lot of these messages in /var/log/messages of my Linux server kernel: nf_conntrack: table full, dropping packet. kernel: __ratelimit: 15812 callbacks suppresse while my server is under DoS ...
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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 Protect Tomcat 7 Against Slowloris Attack

I'm using Apache Tomcat 7 to run my webapp on Linux. I scanned it by Acunetix and it's telling me that my webapp is vulnerable to "Slow HTTP Denial of Service Attack". How can I protect it? Acunetix ...
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5answers
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SYN flooding attack causing high CPU on hardware firewall

I have a ZyWall USG 200 firewall. A few days ago there was a SYN flooding attack on it causing 100% CPU load. After investigating it turns out this was attack from a single IP address and while the ...
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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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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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What to do when GSM/Wifi is jammed and ethernet cables are cut?

So.. There are household alarm systems (to defend against burglars) which send SMS/e-mail alerts if an intruder has been detected or an alert is trigged. However, Mobile networks can be jammed, and ...
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111 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 ...