ERC20 `approve` race-condition.md

105 - ERC20 approve race-condition

The ERC20 standard has a known ERC20 race condition that must be mitigated to prevent attackers from stealing tokens. (See here)

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Slide Screenshot

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Slide Text

• ERC20 approve() -> Race-condition
• approve(100) -> approve(50)
• Allowance Decrease
• Front-run -> Spend 150
• increaseAllowance()
• decreaseAllowance()

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References

• Youtube Reference

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