No sensitive information should be stored on Blockchain
Summary
Anybody can access any information saved on the blockchain
Vulnerability Details
Blockchain is visible to everyone, no sensitive information like password should be stored on the blockchain because all these informations are saved on the evm which is available to everyone.
All you need is the contract address and how values are aranged in the evm
with this web3js method, any files saved on the evm can viewed (including the password in this instance)
await web3.eth.getStorageAt(SMART_CONTRACT_ADDRESS, VALUE_SLOT)
Impact
Any sensitive information stored on the blockchain can be viewed
Tools Used
manual review, webjs
Recommendations
No sensitive information should be stored on the blockchain as it is a public ledger accessible by anyone
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
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