Aave DIVA Wrapper

Summary

The approveCollateralTokenForAave function lacks appropriate access controls, allowing any external account to invoke the function.

Vulnerability Details

1. Lack of Access Control:

   • The function is marked as external, which makes it callable by any account outside the contract.

   • There is no restriction mechanism such as onlyOwner or role-based access control to limit who can call this function.

2. Delegation to Internal Function:

   • The function delegates the actual logic to _approveCollateralTokenForAave. However, the lack of safeguards in the parent function leaves it exposed to misuse.

Impact

• Unintended State Changes:

  • Any user can re-approve tokens, possibly altering the contract's intended interactions with Aave.

• Loss of Integrity:

  • The unrestricted nature of this function undermines the integrity of the contract and may lead to unintended or malicious outcomes.

Tools Used

• Manual code review of the provided smart contract.

Recommendations

1. Implement Access Control:

   • Use onlyOwner or role-based access control to restrict access to the function.

   • Example:

     function approveCollateralTokenForAave(address _collateralToken) external onlyOwner {

     _approveCollateralTokenForAave(_collateralToken);

     }