Questions tagged [denial-of-service]

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Ethernaut level 20 Denial probably no longer solvable. Why?

I solved all levels of Ethernaut game except level 20 Denial: https://ethernaut.openzeppelin.com/level/0xcE1BB92eeb71AF5Fec09D38B0c854d55285f6e04 Eventually, I gave up and looked up the solution on ...
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3 votes
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Is EVM vulnerable to denial of service with out of gas in call to other contract?

if I call a function in a sub-contract and it runs out of gas, the gas is not completely consumed. Instead, it is returned to the calling contract. Could that be a vulnerability for a denial of ...
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Denial of Service(DoS) and withdraw.pendingReturns[msg.sender]=0;

I am trying to understand the role of : withdraw.pendingReturns[msg.sender]=0; in detecting denial of Service (DoS) vulnerability. The following paper VeriSolid says that: withdraw.pendingReturns[...
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3 votes
1 answer
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Hidding IP address behind sentry nodes

I would like to know how to set up an Ethereum node behind sentries (proxy nodes). I know there are several ways to approach this issue as mentioned here. https://medium.com/@kidinamoto/tech-choices-...
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Would a 51% attack be easier if an attacker can DoS certain nodes?

I am wondering whether a 51% attack would be simplified by being able to remotely crash miner nodes. Consider the following scenario: Malicious mining pool A controls 16% percent of the mining power ...
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3 votes
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Denial attacks by submitting transactions with strategically calculated gas prices

As can be understood from the title, there is a specific form of denial attack where specific transactions are blocked by submitting transactions with strategically calculated gas prices. Example 1: ...
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1 answer
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Why are coins at risk when honestly staking?

It has been repeatedly written that staking nodes should buy DDoS protection or be at risk of losing their coins. Can someone explain why an honest staker is at risk of losing his coins in case it ...
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246 votes
8 answers
186k views

What is meant by the term "gas"?

An Ethereum application that I want to use talks about needing "gas" to run. What is gas, and where do I get it?
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