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Questions tagged [denial-of-service]

Denial of Service (DoS) is a family of attacks that attempt to force a target to use up resources (CPU time, memory, bandwidth etc) by flooding a target with useless packets, connections or tasks.

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Discovery Service as a Trust Anchor for P2P Network?

Context I'm designing a P2P network with a central Discovery Service (providing core info about every platform in the network) but no centralised Auth server. OAuth 2.0 and OpenID Connect will be used ...
joannaW's user avatar
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1 vote
0 answers
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What are the security concerns from failing to unpin memory?

I am trying to understand the implication of CVE-2023-40791. The CVE reads: "Linux kernel before 6.4.12 fails to unpin pages in certain situations". NetApp says this could lead to ...
Munazh's user avatar
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0 votes
1 answer
211 views

Is HTTP/1.0 inherently more susceptible to denial-of-service (DoS) attacks?

I'm looking into HTTP version specific risks. HTTP 1.0 lacks support for persistent connections, meaning each request/response pair requires a new TCP connection to be established. Considering the ...
Bob Ortiz's user avatar
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1 answer
183 views

Key difference between DoS & DDoS [duplicate]

What are the key components that define them and what are the differences? are there any standard structure of it? I've looked at several papers, and some of them using as a same, and some of them are ...
drchopin's user avatar
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0 answers
178 views

How can I verify that my DoS attack is effective?

I was trying to simulate a DoS attack on the CORE network emulator using hping3 (Ubuntu). The topology is like three PCs connected by a router. The client's IP is 10.0.0.20/24, The server's IP is 10.0....
Harsha Gangari's user avatar
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0 answers
87 views

Hardened BitTorrent? DoS vulnerabilities?

Is there much information about hardening libtorrent usage, or perhaps other bittorrent flavors? I'm curious about denial-of-service attacks in particular. I could narrow down the bittorrent protocol ...
Jeff Burdges's user avatar
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0 answers
216 views

DoS attack in my home router's logs

I logged in to my router to try to figure out why my phone randomly keeps being unable to connect to my WiFi. I looked in the logs and saw 2 strange rows: [DoS attack: IP packet w/MC or BC SRC addr] ...
whatwhatwhat's user avatar
1 vote
1 answer
202 views

DOS UDP port scans in firewall logs

For a few days, we are getting the following logs on our firewall (Vigor2926ac, up-to-date firmware) The traffic suggests that it comes from Google / Microsoft datacenters, but that's a bit odd that ...
Gino's user avatar
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0 votes
1 answer
88 views

Would XerXes be effective without sending anything over the connections it opens?

From what I gathered, the gist of XerXes is doing this (snippet in Python): with socket(AF_INET, SOCK_STREAM) as s: s.connect((host, port)) s.send(b"0") simultaneously, i.e. ...
John Smith's user avatar
0 votes
1 answer
161 views

Can an attacker flip bits of a signature to create DoS?

Assume two parties communicating. A sends a message to B signed with its private key. B received the message and verify it using the public key of A. Can an attacker launch a DoS attack by flipping ...
lll's user avatar
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0 votes
1 answer
230 views

If I create multiple sockets on a single IP and create a connection with the server with each of them, can I do a DDoS?

So basically, if the server is let's say Apache or any other thread based server, so if I create multiple sockets on my machine and request the server until all of its threads get exhausted and try to ...
Eshu Manohare's user avatar
1 vote
0 answers
165 views

Implement Replay attacks in python [closed]

For an assignment I have to implement a proof of concept and (optionally attack it). The part of OCSP is working so far. I have a client that sends the request to a server, the server verifies if the ...
Z123's user avatar
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0 votes
1 answer
113 views

Exploitation Risks and Considerations specific to running internal DNS servers

I have heard of larger companies are utilizing their own internal DNS servers to route through internal resources. And was wondering if there is any specific exploitation risks and considerations for ...
Rivesticles's user avatar
0 votes
2 answers
103 views

Is triggering abort() and coredump considered denial of service?

I am surprised there is no consensus on mailing lists about this. libgmp is library for big numbers. It is not a library for very big numbers, because if libgmp meets a very big number, it calls abort(...
joro's user avatar
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2 answers
307 views

Is Stack Exchange immune to DDoS and DoS attacks?

I have heard that DDoS and DoS attacks work most of the time and that they are used when SQL insertion and other methods fail. I know Stack Exchange has a lot of programmers, and that they have this ...
anon's user avatar
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0 votes
1 answer
137 views

How would you counter an email/honeypot mischief scenario?

I'm thinking through a mischief denial-of-service scenario that seems too easy to employ. Your web-site validates email addresses for new users on sign-up. A rogue party (a competitor) performs sign-...
JimB's user avatar
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1 answer
81 views

Is application layer DoS dangerous?

I host a website on a cheap 5$ IaaS hosting service without a CDN. An actor with a higher bandwidth internet connection could try to overload my webserver with recursively downloading some data with ...
benoseone's user avatar
4 votes
0 answers
891 views

Protection against JPEG compression bombs

There is a well-known threat named compression bombs. Such image formats as PNG and JPEG use compression methods, and therefore and in theory PNG/JPEG images might be a compression-bomb. I've found an ...
salazar324's user avatar
-3 votes
1 answer
102 views

Are malicious crawling bots a form of application layer DoS?

I would assume that if someone is daily crawling a website in a way which is heavily laborious on the server it may overkill that server. Are malicious crawling bots a form of application layer DoS?
Arcticooling's user avatar
10 votes
3 answers
4k views

Can one prove that a server can be secure against DoS?

Is it possible to prove mathematically that a server is immune to denial-of-service attacks? Or is there some result in computer science journal that it this is an impossible task to do?
curious's user avatar
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1 vote
1 answer
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Altering a load balancer's choice

I was wondering: are there attacks that target a load balancer's choice algorithm? For example, if an attacker takes control of a load balancer, the traffic could be redirected to a single server and ...
X99's user avatar
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0 votes
1 answer
282 views

Basic explanation for why I'm getting different IP addresses when querying for users IP W/without VPN?

I'm trying to work out some basic knowledge of rate-limiting for my server security so I know how it works. Seems pretty simple as there are different algorithms as well as IP limiting methods. This ...
RobbB's user avatar
  • 261
5 votes
4 answers
766 views

Do Key-Derivation Functions pose a Denial-of-Service Threat for APIs?

Imagine a simple API, which offers an endpoint POST /account/authenticate, which takes a username and password, then returns a JWT on success and an error on failure. In the backend, the endpoint uses ...
user avatar
1 vote
1 answer
145 views

How to perform external network scans that will not cause DoS?

What are some tools or techniques that could be used in external network penetration testing to perform safe scans only that are designed to cause no DoS (Denial of Service) or other interruptions? Or ...
rohit's user avatar
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1 vote
2 answers
190 views

Are high traffic apps and websites used in DDoS attacks?

Isn't it very simple for one rogue programmer in a big institution to add a small code change in the application/website thereby sending unintended HTTP DDoS attacks? Like is it possible for Tiktok/...
Vishwa Mithra's user avatar
0 votes
2 answers
662 views

My postfix server is getting DOSed, what can I do?

Port 25 is open and I'm getting thousands of emails. How can I make it stop?
evening's user avatar
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1 vote
1 answer
307 views

How do I differentiate a DDoS attack from a DoS attack?

My server is under attack on an specific port but I am confused whether is a DDoS attack or a DoS attack (if it requires a botnet or is using some kind of trick). The entire server is available (...
Naitoreven's user avatar
0 votes
0 answers
107 views

What is the greatest factor in DoS network flow connection tempo?

I'm conducting some research on botnet detection. I'm specifically looking at Zeek/Bro connection logs (so network flows). I was wondering what affects the tempo of the succession of network flows ...
Charles Gallagher's user avatar
0 votes
1 answer
198 views

Why ACK flood is effective?

I understand that SYN flood is effective due to how protocol works, waiting around 75 seconds before closing the connection. What about ACK flood, what does it happen on the destination side that ...
David's user avatar
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0 votes
1 answer
241 views

Can display a GIF in <img> tag causing Client-side DOS

SVG image can be used in DOS user browser with billion laugh attack. Can we do the same with other image types? especially GIF? Thanks everyone.
trieulieuf9's user avatar
1 vote
1 answer
152 views

Making website queries and return a large amount of data, can it be exploited for DOS attack?

I am testing a website (bug bounty website) and found an endpoint like replycomment?cmt_id[]=1. When open on browser, this endpoint let me reply to comment with id 1 by fetching this comment into a ...
trieulieuf9's user avatar
1 vote
0 answers
197 views

Dos and DDos attacks in UAV

Are modern-day UAVs secured from Dos or DDos attacks? Most of the drones available in the markets are easily hackable with the help of Dos attacks be how secure the UAV-GS authentication is. Moreover, ...
Turing101's user avatar
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0 votes
1 answer
718 views

Can't free proxies be used to create a botnet?

I recently learned that there are plenty of services on the internet that offer/list free public proxies (freeproxylists.net, hidemyass.com, proxyscrape.com to name a few). Is this safe? Can't an ...
Guy4444's user avatar
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0 votes
2 answers
807 views

If HTTPS only runs on a single port, why is SYN flooding an issue?

I've read online that SYN flooding is when "the attacker sends repeated SYN packets to every port on the targeted server." However, HTTPS only runs on port 443. Therefore, why is it ...
Guy4444's user avatar
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1 vote
0 answers
112 views

How to prevent dos(denial of service) attack? [closed]

Hi is there any solid algorithm or solution where I can refer to for preventing dos (denial of service)attack on my apache server ? I did the dos attack using slowloris in ubuntu and switchblade in ...
wanglen soram's user avatar
1 vote
1 answer
166 views

Preventing DDOS attacks without collecting personal data? [closed]

Could anyone suggest a system to prevent DDOS attacks without collecting personal data like i.p. addresses ( or using anonymized data ) and be not deny access to an innocent user ?
savegoodlyfnotendorsinganswer's user avatar
1 vote
0 answers
21 views

How do I use SYN cookies to perform a DOS attack [duplicate]

I am taking a computer security course but I have a question I am stuck on. You are the system administrator for a provider that owns a large network (e.g., at least 64,000 IP addresses). Show how you ...
roger smith's user avatar
3 votes
1 answer
826 views

Email pattern ReDoS

I would like to verify that the input from the user complies to the format of email address (in Java application). On the following page there is verbose regex that should properly validate the email ...
RenatoIvancic's user avatar
1 vote
0 answers
224 views

How susceptible are JWTs to being used for denial of service?

Consider an API that requires a JWT for authorisation. For each JWT presented, it has to validate the signature, including base64 decoding, hashing and asymmetric encryption, which is stated noted as ...
Tony's user avatar
  • 178
0 votes
2 answers
361 views

Brute force without DOS'ing the server

How to conduct brute force tests for directory traversal or other operations that require trial and error without accidentally turning it into DOS attack? It comes to how much bandwidth a site is ...
user378298's user avatar
0 votes
1 answer
175 views

Is possible to deliver a dos attack increasing a database table?

If a user through a request can add a record to a table (for each request) is theoretically possible that he could cause a dos attack just increasing the size of a table?
Maicake's user avatar
  • 567
0 votes
0 answers
51 views

My friends are disrupting my internet connection [duplicate]

My friends have my ip address and they're all programmers/hackers. They've been interfering with my wifi connection several times today. Asking them to stop or saying "they won't do anything"...
Redowan's user avatar
1 vote
1 answer
145 views

Denial of Service question

I am studying for an exam in computer security, and I got stuck on the following question from a past exam: A random program generator service S allows clients to generate random data. Each client Ci ...
Unknown's user avatar
  • 23
1 vote
1 answer
151 views

Outgoing messages while under massive denial-of-service attack

As I understand it, there is no internet protocol that provides true broadcast like in say a card game or a partially synchronous network assumption. How close can internet protocols come though? We'...
Jeff Burdges's user avatar
1 vote
1 answer
246 views

Possible ways to intrigue IP blockage on practical websites

Assume that I share the same IP address with others. Then if I can do something bad to intrigue practical websites, such as Google, Amazon, or jQuery to block me, then all other users will also be ...
dovod74538's user avatar
1 vote
1 answer
389 views

How can a SYN flood affect a router in this scenario?

I'm using two routers in my home network, as described in this question (router B in the diagram). Therefore, router B is not accessible from the internet. Going over the logs of this router, I was ...
user avatar
2 votes
4 answers
302 views

Will brute force attack exhaust web server, resulting in DOS

I do know the difference between brute force attack and DOS. What if a web server doesn't have account lock out in place and a few brute force attacks is being started in parallel, and these attacks ...
Sam's user avatar
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1 vote
0 answers
149 views

Suppose a mischievous coffeeshop wifi gateway wants to drain phone batteries

Suppose a mischievous coffeeshop wifi gateway wants to drain phone batteries. It is easy to see how it might weaken signals and flip a few bits to wreak NAK havoc at the link level so wifi chip power ...
bobuhito's user avatar
  • 240
0 votes
1 answer
284 views

"Memory-Hard" vs. "Memory-Bound" Functions?

One of the approaches in order to prevent Sybil or DoS attacks is CPU-bound PoW. However, because of the influence of Moore’s law, the memory-based approaches are suggested. As actually there are two ...
Questioner's user avatar
  • 1,317
0 votes
1 answer
125 views

DoS attack blocks website while in another connections show website run normally [closed]

I am learning Ethical Hacking. I create my own website on a cloud hosting service for testing purposes. I run DoS attack from my local VM and it shows that website is down. When I sent a link to my ...
MirDer's user avatar
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