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

learn more… | top users | synonyms (1)

2
votes
2answers
1k views

Does “loose source and record route” drop the source address?

Is the source IPv4 address lost when a person uses "loose source and record route" and the destination address is put before the end of the list of addresses through which routing should occur? It ...
2
votes
1answer
1k views

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 ...
2
votes
3answers
74 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 ...
2
votes
2answers
251 views

Does a self-signed certificate offer more protection than a public key?

I'm having a hard time finding the practical benefits of transmitting a self-signed certificate over simply a public key. I understand that a self-signed certificate proves the integrity of the public ...
2
votes
2answers
104 views

Preventing a Computational DoS Attack in Public Key Cryptosystems

I'm designing a server which accepts anonymous messages using ECIES: as in, anonymous users send the server an ephemeral EC public key, and the server uses ECDH to derive a shared secret, and some KDF ...
2
votes
1answer
2k views

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 ...
2
votes
2answers
91 views

2 External IPs to prevent DDoS?

In my home network I currently have a Hitron cgnm-2250 acting as a modem/router combo with an IP Passthrough option enabled for a 2nd router connected to it (ddwrt nighthawk x6 r8000). I already have ...
2
votes
1answer
153 views

Server side validations for file upload to prevent DoS on HTTP server

I am aware that client side validations can be easily bypassed by means like disabling javascript. I would like to know the things to be checked while doing a server side validation for file upload. I ...
2
votes
3answers
172 views

Is opening a new mysql connection for each query potentially unsafe?

I am doing some unit testing and noticed that if I click (or have multiple people clicking) the same filter very very fast (very precise I know;) eventually I get a "The connection is already open." ...
2
votes
3answers
1k views

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 ...
2
votes
1answer
3k 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, ...
2
votes
1answer
207 views

Are COMET installations immune to “Slow TCP Reading” DoS on Windows? (Such as SignalR or WebSync)

My understanding is that COMET implementations of WebSync and SignalR do not directly use IIS and are a few layers lower on the ISO model. After reading Qualys's blog regarding slow TCP reading, I ...
2
votes
1answer
124 views

How can I protect my “try it with one click” service?

I have a service with "try it now" experience that currently offers a "one click" effort. This service has a pool of N resources (lets say 50). Each new resource takes about 1 hour to generate. ...
2
votes
3answers
703 views

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 ...
2
votes
1answer
36 views

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 ...
2
votes
1answer
2k views

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 ...
2
votes
1answer
6k views

Snort/IDS detect and alert on possible DoS/DDoS attack?

As per the title, I'm attempting to configure Snort to detect and alert on a incoming Denial of Service attack. Looking at the rulesets, which are primarily signature based rules, I can't see a ...
2
votes
1answer
167 views

Reflection Attacks on Server

I was reading a research paper entitled "Steps to Defend Against DoS Attacks" when I came across this point: "A reflection attack on a server would require server-client-server communication, ...
2
votes
0answers
39 views

DNS Server Recursive Query Cache Poisoning Weakness “Bounce DoS”

Tenable Nessus states that if there is a DNS Server Recursive Query Cache Poisoning Weakness the host allows recursive queries via UDP, then the host can be used to 'bounce' Denial of Service attacks ...
2
votes
0answers
273 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 ...
1
vote
2answers
377 views

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, ...
1
vote
3answers
2k views

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 ...
1
vote
3answers
3k views

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 ...
1
vote
2answers
171 views

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 ...
1
vote
1answer
98 views

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 ...
1
vote
2answers
60 views

Protecting server from bogus HTTP Requests

What would be the recommended approach to block those typical bogus HTTP requests that the server gets bombarded with? Also has this attack/nuisance been named yet or is it generalized as Bot ...
1
vote
1answer
746 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?
1
vote
2answers
972 views

Secure against HTTP FLOOD ATTACK

What is the best way to defend your web site against HTTP FLOOD POST/GET ATTACK ?
1
vote
3answers
300 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 ...
1
vote
1answer
143 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 ...
1
vote
1answer
101 views

Secure Client-Initiated Renegotiation - DoS DANGER

I tested my server against cryptographic attacks and I have a few major and minor issues. However I would like to know how can I mitigate and protect against such vulnerability warning: Secure ...
1
vote
1answer
93 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 ...
1
vote
2answers
341 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 ...
1
vote
1answer
969 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 ...
1
vote
1answer
263 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 ...
1
vote
1answer
257 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. ...
1
vote
1answer
123 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 ...
1
vote
2answers
70 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 ...
1
vote
1answer
231 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] ...
1
vote
2answers
2k views

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 ...
1
vote
2answers
750 views

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 ...
1
vote
2answers
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 ...
1
vote
1answer
59 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.
1
vote
1answer
269 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 ...
1
vote
1answer
107 views

Could a large amount of wget requests be viewed as an attack?

I'm working on a program that downloads and analyzes historical stock data from Yahoo Finance. I download the data in my program by using the wget command. I have a list of about 3,000 stock symbols ...
1
vote
1answer
101 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 ...
1
vote
1answer
48 views

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 ...
1
vote
1answer
609 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 ...
1
vote
2answers
84 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 ...
1
vote
3answers
136 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 ...