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code-423n4 / 2021-11-badgerzaps-findings

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Use safeTransfer/safeTransferFrom consistently instead of transfer/transferFrom #8

Open code423n4 opened 2 years ago

code423n4 commented 2 years ago

Handle

defsec

Vulnerability details

Impact

It is good to add a require() statement that checks the return value of token transfers or to use something like OpenZeppelin’s safeTransfer/safeTransferFrom unless one is sure the given token reverts in case of a failure. Failure to do so will cause silent failures of transfers and affect token accounting in contract.

Reference: This similar medium-severity finding from Consensys Diligence Audit of Fei Protocol: https://consensys.net/diligence/audits/2021/01/fei-protocol/#unchecked-return-value-for-iweth-transfer-call

Proof of Concept

  1. Navigate to the following contracts.
  2. transfer/transferFrom functions are used instead of safe transfer/transferFrom on the following contracts.
https://github.com/Badger-Finance/ibbtc-curve-zap/blob/47a9964d17f9c5bea314d21186773aef99012153/contracts/DepositZapibBTC.vy#L388

https://github.com/Badger-Finance/ibbtc-curve-zap/blob/47a9964d17f9c5bea314d21186773aef99012153/contracts/DepositZapibBTC.vy#L179

https://github.com/Badger-Finance/ibbtc-curve-zap/blob/47a9964d17f9c5bea314d21186773aef99012153/contracts/DepositZapibBTC.vy#L160

Tools Used

Code Review

Recommended Mitigation Steps

Consider using safeTransfer/safeTransferFrom or require() consistently.

GalloDaSballo commented 2 years ago

Agree wth finding, safeErc20 ftw