ArkProject: NFT Bridge
ArkProject
NFTBridge
60,000 USDC
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Submission Details
Severity: high
Valid

`Bridge` is unable to transfer ownership and upgrade on `ERC721Bridgeable`

fyamf

Summary

The admin function is missing in the contract Bridge to transfer ownership on ERC721Bridgeable or change the implementation address on ERC721Bridgeable proxy.

Vulnerability Details

When an ERC721Bridgeable is deployed on L1, the bridge will be the owner of this contract. But, there is no way for the bridge to call admin functions on ERC721Bridgeable, like transferOwnerShip.

In other words, on L2, the bridge is able to change such critical states on the erc721_bridgeable. But, on L1, this is missing.

#[abi(embed_v0)]
impl BridgeCollectionAdminImpl of IStarklaneCollectionAdmin<ContractState> {
fn collection_upgrade(ref self: ContractState, collection: ContractAddress, class_hash: ClassHash) {
ensure_is_admin(@self);
IUpgradeableDispatcher { contract_address: collection }
.upgrade(class_hash);
}
​
// transfer owner of the given collection to the given address
fn collection_transfer_ownership(ref self: ContractState, collection: ContractAddress, new_owner: ContractAddress) {
ensure_is_admin(@self);
IOwnableDispatcher { contract_address: collection }
.transfer_ownership(new_owner);
}
}

https://github.com/Cyfrin/2024-07-ark-project/blob/main/apps/blockchain/starknet/src/bridge.cairo#L367

This can lead to some issues:

  • If the implementation of ERC721Bridgeable proxy is going to be changed, its owner (which is the bridge) should call the function upgradeToAndCall on the ERC721Bridgeable proxy to update the implementation address. But, since the bridge does not have any function to be able to call upgradeToAndCall on the ERC721Bridgeable proxy, this will be impossible.
    https://github.com/OpenZeppelin/openzeppelin-contracts/blob/master/contracts/proxy/utils/UUPSUpgradeable.sol#L86

  • If the address of the bridge on L1 is going to be changed for any reason (it is a proxy structure, but if a new proxy is going to be deployed), there is no possibility that the old bridge changes the address of the owner of ERC721Bridgeable through transferOwnerShip to the new bridge proxy. So, all the already deployed ERC721Bridgeable will remain still owned by the old bridge. Or if, for any other reasons, the owner of an L1-collection is to be changed, there is not any straight forward way to do so.

Please note that ERC721Bridgeable is out-of-scope of this contest, but the issue is in the contract bridge that does not have any function to call admin functions on ERC721Bridgeable.

Impact

  • Bridge which is the owner of ERC721Bridgeable can not change ownership of ERC721Bridgeable or upgrade its implementation.

Tools Used

Recommendations

The following functions should be added to the Bridge.

function collectionTransferOwnership(address _collection, address _newOwner) external onlyOwner {
IERC721(_collection).transferOwnership(_newOwner);
}
function collectionUpgrade(address _collection, address _newImplementation, bytes memory _data) external onlyOwner {
IERC721(_collection).upgradeToAndCall(_newImplementation, _data);
}
Updates

Lead Judging Commences

n0kto Lead Judge 9 months ago
Submission Judgement Published
Validated
Assigned finding tags:

finding-no-transferOwnership-or-upgrade-for-collections-in-CollectionManager

Likelyhood/Impact: High, it will never (until an upgrade) be able to update or transfer the ownership of any collections created on L1.

Appeal created

nirohgo Auditor
9 months ago
n0kto Lead Judge
9 months ago
n0kto Lead Judge 9 months ago
Submission Judgement Published
Validated
Assigned finding tags:

finding-no-transferOwnership-or-upgrade-for-collections-in-CollectionManager

Likelyhood/Impact: High, it will never (until an upgrade) be able to update or transfer the ownership of any collections created on L1.

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