Arithmetic Overflow and Underflow | Hack Solidity (0.6)

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In this video, we will examine a Solidity smart contract that is vulnerable to uint overflow and underflow.

#Solidity #Overflow #Underflow

References

  1. Smart Contract Programmer
  2. Ethereum
  3. Solidity
  4. Smart contract
  5. hack
  6. overflow
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Комментарии
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Uint overflow and underflow explanation 0:20
Code 3:10
Preventative techniques (using SafeMath) 9:43

smartcontractprogrammer
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This is fantastic. I was searching for an understanding of overflow and I got so much more. Thanks!

Darbyslaton
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This is a great channel. Glad I got to know about this so early!

rattle_
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Amazing vid! just heads up to those watching rn, arithetic overflow and underflow reverts for solidity v0.8+

bautistabaiocchi-lora
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Very well explained !! 😍 Thank you!! I find this new serie is so valuable so far !! Every smart contract developer should learn this !!
Question: If these has become known vulnerability in Solidity, is the company working on remedy to enhance protection via new versions ?

salem
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This playlist should be updated for 0.8

pythusiast
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If I try to do this in a real attack, would I have to deploy the original contract that has the vulnerability AND the contract that "attacks" the vulnerability with my Metamask wallet (injected Web3)
?

KingOfNeptune_
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essentially, what it means is the malicious contract can modify the lockTime value? Is there a way to "lock" it internally, so it can't be modified at all from external contract?

kaionwong
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I am confused that Why at05:36 line 37 "constructer( TimeLock _timeLock) in this course, but in the course of "Reentrancy | Hack Solidity (0.6)" 05:30 line35 "constructor (address _etherstoreAddress)"? What is the difference between the two ways?

qffmjsz
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So based on the answer you teach in the solidity 0.8 course, may I say "Arithmetic Overflow and Underflow " is not an issue any more?

qffmjsz
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I don't think your attack function works correctly because all its doing is depositing Ether on the contract but its not withdrawing it anywhere. Let me know if I am missing something. Love your videos :)

erog
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