Summary

WStETHMock and StETHMoc tokens are missing the burn functionality that is crucial when tokens are bridged or when ETH is unstaked.

Vulnerability Details

When users want to claim their ETH back they should burn their stETH in order to do so. Howecer the burn function is absent. When wstETH is bridged from one chain to another it should also be burnt on the sending chain.

Impact

Both tokens are missing crucial function to function properly. Users cannot claim ETH back or bridge them to another chain.

Tools Used

Manual review

Recommendations

Add burn logic to both token contracts