unhacked is a weekly ctf, giving whitehats the chance to go back in time before real exploits and recover funds before the bad guys get them.
you are a whitehat, right anon?
schnoodle is a dao on ethereum mainnet, governed by the SNOOD token.
after running smoothly for its first ~year, on 6/18, the ETH-SNOOD uniswap pair was drained for over 100 ETH.
- token (proxy): 0xd45740ab9ec920bedbd9bab2e863519e59731941
- token (implementation): 0xeac2a259f3ebb8fd1097aeccaa62e73b6e43d5bf
- uniswap pair 0x0f6b0960d2569f505126341085ed7f0342b67dae
review the code in this repo, find the exploit, and recover > 100 ETH.
(hint: the issue is in the token implementation, so focus on src/SchnoodleV9.sol and src/imports/SchnoodleV9Base.sol. no need to look at the other files)
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fork this repo and clone it locally.
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create an .env file with an environment variable for ETH_RPC_URL (or add the rpc url directly into the test file).
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review the code in the
src/folder, which contains all the code at the time of the hack. you can explore the state of the contract before the hack using block 14983600. ex:cast call --rpc-url ${ETH_RPC_URL} --block 14983600 0xd45740ab9ec920bedbd9bab2e863519e59731941 "getFarmingFund()" -
when you find an exploit, code it up in
SchnoodleHack.t.sol. run the test withforge test -vvv. the test will pass if you succeed. -
post on twitter for bragging rights and tag @unhackedctf. no cheating.
this contest is no longer live. you can read a write up of the solution here or find the solution code in test/SchnoodleHackSolution.t.sol.
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