First Flight #17: Dussehra
First Flight #17
Beginner FriendlyFoundryNFT
100 EXP
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Submission Details
Severity: high
Valid

Organiser can change already selectedRam by `ChoosingRam::selectRamIfNotSelected`

appet

Description:

After users set selectedRam by calling ChoosingRam::increaseValuesOfParticipants (using semi-randomization which is a part of another issue) and setting the selectedRam state variable, there is no statement, changing the isRamSelected bool to true. This leads to ChoosingRam::selectRamIfNotSelected passing, when called by Organiser, making possible for Organiser to change again the value of selectedRam.

Impact:

We should consider that Organiser could call this function by accident or with malicious intent.
Although ChoosingRam::selectRamIfNotSelected uses some kind of (semi-)randomization the random variable of ChoosingRam::selectRamIfNotSelected could be manipulated.
In both scenarios this is a serious centralization issue, breaking the protocol`s intended purpose and decentralization as a whole.

Proof of Concept:

Paste the following code in the Dussehra.t.sol:

​
function test_changeRamAfterSetRam() public participants {
vm.startPrank(player1);
choosingRam.increaseValuesOfParticipants(0, 1);
choosingRam.increaseValuesOfParticipants(0, 1);
choosingRam.increaseValuesOfParticipants(0, 1);
choosingRam.increaseValuesOfParticipants(0, 1);
choosingRam.increaseValuesOfParticipants(0, 1);
vm.stopPrank();
assertEq(choosingRam.selectedRam(), player2);
​
vm.warp(1728691200 + 4);
vm.startPrank(organiser);
choosingRam.selectRamIfNotSelected();
vm.stopPrank();
​
assertEq(choosingRam.isRamSelected(), true);
assertEq(choosingRam.selectedRam(), player1);
}

Recommended Mitigation:

Consider adding a line of code that changes the isRamSelected bool to true in ChoosingRam::increaseValuesOfParticipants

​
function increaseValuesOfParticipants(uint256 tokenIdOfChallenger, uint256 tokenIdOfAnyPerticipent)
public
RamIsNotSelected
{
.
.
.
+ isRamSelected = true;
}
Updates

Lead Judging Commences

bube Lead Judge over 1 year ago
Submission Judgement Published
Validated
Assigned finding tags:

`isRamSelected` is not set

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