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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Restarting a wifi router with too many connections at the same time? [on hold]

Will router restart itself if receives too many connections at the same time, i.e. 200 connections. Will a enough big number of simultaneous connections bring the router down? Will this work? I ...
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1answer
272 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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2answers
441 views

DoS and Hacking - Terms and Definitions [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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3answers
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How can I block an IP, if I'm getting many http requests in a second?

If some one tried force burst attack on my website, how can I block them? Ideally, I want to block an IP if I have many http/Apache requests in a second.
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1answer
90 views

Is there an easy way to know if a regex is “evil”

I was reading this article (about ReDos). The examples they give are pretty simple but I'm sure such regex can hide everywhere. If there is any way to test if a regex is evil without spending a lot of ...
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1answer
70 views

Random scanning or potential attack/recon? [duplicate]

If the purpose of a SYN Flood attack would be to make the target unresponsive to normal traffic, same as any other DoS, wouldn't this attack generally have been directed at a public server rather than ...
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2answers
687 views

UDP flood from my machine, or false positive?

The company that hosts my dedicated server has alerted me to what they think is malicious traffic coming from my machine. They supplied me with graphs showing a large amount of UDP traffic coming from ...
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4answers
109 views

Is 100% anonymity possible with Tor under certain circumstances? [duplicate]

Tor has guidelines that define a set of rules/techniques to assure anonymity. Some examples are browsing in small window mode so your screen resolution can't be detected, using HTTPS everywhere, and ...
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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 ...
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6answers
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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 ...
4
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1answer
153 views

What are the mitigating factors for CVE-2015-5364?

CVE-2015-5364 describes a UDP based DoS vulnerability in the Linux kernel that can be used to deny processing cycles to the host operating system and its applications. ...
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71 views

SYN Flood attack on private user - steps for post-analysis?

The firewall in question, used in a secured home office, reported a series of SYN Flood matches on various requests coming in over a ten-second period. The IP and country of origin changed with every ...
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Blocking all remote connections - Cisco LRT214 [migrated]

Recently had a SYN Flood attack on my home office. The attack was stopped by our Cisco LRT214. Most of the configs are manufacturer default. Any way to simply disable all remote connections without ...
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1answer
353 views

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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1answer
105 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 ...
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2answers
92 views

How long does it take to execute a DoS attack on a PC using the ping… -t CMD command?

Suppose the target of a Denial of Service attack is a PC on LAN with IP 192.168.1.10. Then, I can continue to ping the target by running the ping command in an infinite loop in CMD, that is, by ...
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2answers
94 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 ...
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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 ...
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3answers
1k views

How can I defend against malicious GET requests?

My server is getting hit with a variety if requests like the following: Started GET "/key/values" ActionController::RoutingError (No route matches [GET] "/key/values") Started GET "/loaded" ...
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1answer
72 views

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 ...
2
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0answers
40 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 ...
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5answers
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What is a DoS Attack and how does it differ from a DDoS attack?

Can some one explain to me the concept of Dos Attacks for web applications ? Also what is the distinction between Dos and Distributed Dos ( ie DDos) attacks ? Wikipedia says : In computing, a ...
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2answers
92 views

Deny attacker access to my router

I was experiencing very low connectivity on my wireless, so I checked the router logs. Here's what I saw: Jul 09 11:07:24 Per-source ACK Flood Attack Detect (ip=74.125.130.129) Packet Dropped Jul 09 ...
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1answer
116 views

HPKP-based persistent denial-of-service attack on web sites

HTTP Public Key Pinning (HPKP) is a standard that allows a HTTPS website to specify which certificates it trusts, and instruct the browser not to allow any connection to that site that's secured by ...
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4answers
339 views

What are the drawbacks of login request throttling?

In a web application, one way to protect against password guessing attacks is to lock out accounts after a set number of failed logins. This could be done on both source IP address and username. For ...
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2answers
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How to prevent smurf attack?

I am using college network to access internet. Many other users are using the same network. Recently I have been experiencing sluggish net connection. So when I did some investigation, I found that ...
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2answers
418 views

How to mitigate UDP flood attacks?

My friend linked me some website where you pay $5.00 / m and get access to a plethora of 'dos stresser' tools that offer udp flooding, and other malicious flooders. It's a web-based system and you ...
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9answers
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Can attackers get anything with DoS attacks except crashing the service?

A DoS (short for "denial of service") attack is a form of attack used on web services which aims to "crash" the service. Is there any motive of this form of attack besides crashing the service / ...
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How can the Android GraphicBuffer::unflatten() vulnerability (CVE-2015-1474) be exploited remotely?

I've been reading up-on DoS (denial-of-service) attacks within android and although I understand attacks like the below, which make use of regular programming functions etc. (Android Web Browser) ...
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122 views

What to do if I accidentally DoS a site? [closed]

A few weeks ago I was non-maliciously using a website with server-side calculations when curiosity got the better of me and I decided to mess with some GET request values. I expected the site to give ...
4
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1answer
181 views

Is there any protection against malicious devices on a CAN bus?

CAN (controller area network) is a bus used in all modern cars. You can read a lot of the cars information over this bus and I think (but I'm not too sure about this) that some critical control ...
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4answers
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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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3answers
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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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1answer
194 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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2answers
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Content management url security

I manage a website that is a "bad magnet" for our competitors. I am using Incapsula CDN + WAF and I have internal proxy for caching. CMS/WP from its nature is very data consuming, I have check ...
2
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3answers
704 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 ...
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1answer
113 views

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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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 ...
3
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1answer
172 views

RSnake's Slow Loris tool

I was looking at RSnakes implementation of his Slow Loris done on perl which can be seen here. I set up a little server to listen to his packets, and at first found this GET / HTTP/1.1\r\nHost: ...
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2answers
215 views

What is this strange GET request (GET /A0A32579-2767) DoSed my apache?

I have apache behind nginx on my webserver. Today my apache stops answering to requests. Investigations shows this situation: Number of apache processes grows more that 500 but MaxChildren=256 in ...
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2answers
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Is radio burst transmission really “jam resistant”?

Quoted from here: Certain military communication systems are based on the jam-resistant burst transmission of binary telegrams which consist of orthogonal spread-spectrum waveforms (BOK). To ...
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1answer
110 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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2answers
67 views

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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1answer
24 views

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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Prevent denial of service attacks against slow hashing functions?

I've been thinking about bcrypt recently, and what I wonder is if there's a way to deal with the inherent (D)DoS problems with slow hashing functions. Namely, if I set up bcrypt so my machine takes ...
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1answer
138 views

Slow Loris Incomplete GET Request

A slow loris attack is an attack of incomplete GET requests to most famously an Apache server because the server does not timeout the connection made after extremely long periods of time, from my ...
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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.
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105 views

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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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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2answers
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DoS attacks and bitcoin

I was wondering what the repercussions were if a Bitcoin exchange or website that holds bitcoins were to succumb to a DoS attack. In my understanding, all a denial-of-service attack does is deny ...