Submission Details
Severity:
Random can be manipulated
Summary
selectWinner is an external function that can be called by anyone.
Onchain random using address, timestamp and block data can be manipulated to set the winner by any user.
Vulnerability Details
random will depend on the caller and block data. anyone can use different data and estimate the outcome before running the function, therefore winning the raffle themselves.
Impact
Manipulated winner
Recommendations
Use VRF for correct random number.
Updates
Lead Judging Commences
Hamiltonite over 1 year ago
Submission Judgement Published Assigned finding tags:
weak-randomness
Root cause: bad RNG Impact: manipulate winner
Rewards breakdown
nSLOC
143This contest has a flat reward structure with the following payouts:
100 EXP
20 EXP
2 EXP
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