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Questions tagged [dos]

Denial-of-service attacks are attempts to make machines or other network resources unavailable to their intended users.

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Cycling introduction points

Is it possible to cycle your selected introduction points after X time has passed so new introduction points can be selected? If so, how would I achieve this either within the current functionality of ...
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How good is Tor's implementation of DoS mitigation?

Should I do something on my Debian 10 side or the Tor 0.3.5.8 itself is able to mitigate most of the DoS attacks? Background: Yesterday I have set up my new relay. I have the overall maximum ...
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Is denial of service possible by getting the exit node to create another circuit?

Even though circuit length is limited to 8, can an attacker create a circuit of length 8, and then get the exit node to create another circuit of length 8 (get the exit node to be a Tor client)? Then ...
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76 views

Will the network know if a malicious guard keeps dropping connections?

Selective denial of service on guard nodes is a well-known attack, in which the malicious guard keeps dropping connections from Tor clients who are not in the set of his targeted victims. Do Tor ...
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1answer
316 views

Disproportionate CPU usage

My new Raspberry Pi 3 relay was relaying 2 MBps using maybe 80% CPU for a few days. But suddenly, just today, it jumped to using 380% CPU, using almost all of each of the 4 cores to serve the same ...
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2answers
200 views

Are there problems on tor netowrk?

I have speed problems on tor with tails. I mean the browsing is very very slow. For example my usual bandwidth is 5,3 mbit and on tor network is 88 kbit. Some guy on #tor@oftc.net are saying that ...
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130 views

How does selecting new guard relays work?

I've been told guards are selected when a client first connects to the Tor network and used until they disappear. What constitutes disappearing? Do all guards need to disappear (and then the whole ...
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1answer
183 views

Had valet nodes been implemented?

I am reading this article: https://blog.torproject.org/blog/hidden-services-need-some-love And there is a paragraph states that: Defense against Denial of Service of Introduction Points The ...
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228 views

How to mitigate layer 7 attacks on hidden services?

I've observed the following: The Tor client establishes reverse connections to random relays and any further hidden service traffic is tunneled trough these connections. This means: There are no ...
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1answer
127 views

Can a tor hidden service be successfully attacked via (D)DoS?

I'm planning on creating a tor hidden service(in the context of a research project) and am wondering how resilient is it against common (D)DoS attacks(i.e. DNS amplification, UDP flood, etc.) given ...
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1answer
77 views

If everyone used Tor, how would websites protect themselves from malicious traffic?

This question came after seeing CloudFlare captchas, forums outright banning Tor IPs to protect themselves from malicious traffic, and all manner of hurdles where sites simply don't want Tor traffic. ...
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1answer
71 views

If my network link is subject to frequent, short, outages (a gentle form of DoS attack?), can this help promote other nodes to guard before mine?

My broadband provider in the UK is a very large telecoms company that was once state owned. I have an "unlimited" broadband contract with them so running my Tor (non-exit) relay with an advertised ...
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226 views

DoS attacking Tor users

Let's say we have two users connected via a socket over Tor. Is there anyway for one user to DoS the other user, maybe by learning their real IP address? My end goal is to design a system that let ...
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1answer
158 views

What prevents an arbitrarily long or cyclic cell relay in the network?

I'm sure there are mechanisms in place to prevent this, but what stops someone from making a circuit that is extremely long or cyclic, as to cause a DOS in the network? If possible, this would allow ...
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1answer
92 views

What happens if I create a flood of hidden services?

I could generate a torrc like this: HiddenServiceDir /Library/Tor/var/lib/tor/hidden_service0/ HiddenServicePort 80 127.0.0.1:8080 HiddenServiceDir /Library/Tor/var/lib/tor/hidden_service1/ ...
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91 views

How to protect against DoS but not harm Tor users

Often when websites want to protect themselves against Denial-of-Service attacks, they will limit the number of requests one IP address can make in a given span of time. Sometimes this practice ...
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2answers
327 views

Are low bandwidth DoS attacks performed over the Tor network a problem to be considered?

For low bandwidth and slow DoS / DDoS attacks (for example Slowloris, SlowLoris and PyLoris) the Tor network seems to be very useful medium. For free it offers two important things to the attacker: ...