Beanstalk: The Finale

Summary

Users lose roots upon migration

Vulnerability Details

When migrating to L2, the user's roots are included in the merkle leaf. If before their migrations seasons have passed and the stemTip has increased, user will be minted extra stalk for it.

Usually, when stalk is minted, roots are also minted at the current silo ratios. However, this will not be the case here.

As users will be minted less roots, this will make the overall roots : stalk ratio higher, which will on its own allow for unfair minting of Beans via plant for all other users

Impact

Loss of roots, unfair minting of Beans

Tools Used

Manual review

Recommendations

Mint extra roots depending on the newly minted stalk