Access to sensitive data
Summary
Anyone can retrieve the password set by someone
Vulnerability Details
The smart contract has an access control vulnerability. Indeed, everyone is able to retrieve the password stored by a user. Here is the proof of concept :
Deploy the contract and set a password with Remix IDE
Take the transaction hash and search it on etherscan
We can retrieve the password on Overview -> More Details -> Input data
Impact
This smart contract application is not secure and everyone can retrieve the password
Tools Used
Manual review
Recommendations
Don't store sensitive information on the blockchain
Lead Judging Commences
finding-anyone-can-read-storage
Private functions and state variables are only visible for the contract they are defined in and not in derived contracts. In this case private doesn't mean secret/confidential
Rewards breakdown
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