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uniswapv3-unrefunded-eth-poc's Introduction

PoC: Uniswap's SwapRouter doesn't refund unspent ETH in partial swaps

This is a proof of concept of the bug I found in Uniswap's SwapRouter. Read the blog post for more details: https://jeiwan.net/posts/public-bug-report-uniswap-swaprouter/

Usage

  1. Ensure that you have Foundry installed.
  2. Run forge install to install the deps (forge-std).
  3. Set the ETH_RPC_URL env var to an Ethereum Mainnet RPC endpoint (e.g. use Alchemy).
  4. Run: 
    $ forge test --mc UniswapV3ETHRefundExploitTest

Exploit Scenario

  1. Alice wants to sell 1 ETH and buy some UNI. However, Alice wants her trade to be executed before the price X is reached.
  2. Alice calls the exactInputSingle function of SwapRouter, sets the sqrtPriceLimitX96 argument to the price X, and sends 1 ETH along with the transaction.
  3. The router executes the swap via the ETH-UNI pool. The swap gets interrupted when the price X is reached.
  4. Before reaching the price X, only 0.7 ETH of Alice were consumed to convert them to 100 UNI.
  5. Alice receives 100 UNI while spending 1 ETH, the router contract keeps holding the remaining 0.3 ETH.
  6. A MEV bot withdraws the 0.3 ETH by calling the refundETH function.

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