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RebalanceManager.sol#setRebalanceManager() should implement two-step transfer pattern #226

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code423n4 opened this issue Dec 19, 2021 · 1 comment
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0 (Non-critical) Code style, clarity, syntax, versioning, off-chain monitoring (events etc), exclude gas optimisation bug Something isn't working

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@code423n4
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WatchPug

Vulnerability details

https://github.com/code-423n4/2021-12-amun/blob/98f6e2ff91f5fcebc0489f5871183566feaec307/contracts/basket/contracts/callManagers/RebalanceManager.sol#L57-L63

function setRebalanceManager(address _rebalanceManager)
    external
    onlyRebalanceManager
{
    rebalanceManager = _rebalanceManager;
    emit RebalanceManagerSet(_rebalanceManager);
}

RebalanceManager.rebalanceManager is a critical role, if the current rebalanceManager mistakenly calls setRebalanceManager() with a wrong address, it can result in all the onlyRebalanceManager() methods being unaccessible, and it cannot be undo.

Recomandation

Consider changing the setRebalanceManager() function to first nominate an address as the pending rebalanceManager and adding an acceptRebalanceManager() function which is called by the pending rebalanceManager to confirm the transfer.

Also in:

https://github.com/code-423n4/2021-12-amun/blob/98f6e2ff91f5fcebc0489f5871183566feaec307/contracts/basket/contracts/callManagers/RebalanceManagerV2.sol#L43-L49

function setRebalanceManager(address _rebalanceManager)
        external
        onlyRebalanceManager
    {
        rebalanceManager = _rebalanceManager;
        emit RebalanceManagerSet(_rebalanceManager);
    }

https://github.com/code-423n4/2021-12-amun/blob/98f6e2ff91f5fcebc0489f5871183566feaec307/contracts/basket/contracts/callManagers/RebalanceManagerV3.sol#L48-L54

function setRebalanceManager(address _rebalanceManager)
        external
        onlyRebalanceManager
    {
        rebalanceManager = _rebalanceManager;
        emit RebalanceManagerSet(_rebalanceManager);
    }
@code423n4 code423n4 added 1 (Low Risk) Assets are not at risk. State handling, function incorrect as to spec, issues with comments bug Something isn't working labels Dec 19, 2021
code423n4 added a commit that referenced this issue Dec 19, 2021
@0xleastwood
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I think this can only be argued as non-critical as it involves mis-use of a transfer function by the previous rebalance manager.

@0xleastwood 0xleastwood added 0 (Non-critical) Code style, clarity, syntax, versioning, off-chain monitoring (events etc), exclude gas optimisation and removed 1 (Low Risk) Assets are not at risk. State handling, function incorrect as to spec, issues with comments labels Jan 23, 2022
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Labels
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