Withdraw logic error
Days in Operation:
At around 06:00 UTC on Friday September 18th 2020, users in the Harvest Finance Discord chat began reporting problems with fWETH withdrawals.
At the time of the incident, the fWETH vault was using a farming strategy that earned interest for depositors by deposited the underlying WETH onto the CREAM platform for lending. CREAM lending is based on a fork of the Compound lending codebase.
When an fWETH withdrawal is processed, the underlying WETH should be removed from CREAM and returned to the claimant, and the interest-bearing fWETH deposit receipt should be burned. In the faulty transactions, the deposit receipt was burned, but only some or even none of the requested WETH was withdrawn from CREAM and returned to the user. Approximately 5% of the fWETH supply held by 11 owners attempted to withdraw and was affected by this bug.
Incident was resolved and funds were returned to locked users.
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