WhoAmI?
may be auditor
Block: 33
Author: Anonymous
AuditProfile
Security blog
Execute Meta Transaction
#signature
#replay
Hint
One of the most basic rules when dealing with low-level calls.
Answer
Developers do not check return from call function. This means that in case of a failed call, the nonce will remain the same and a hacker can use the signature with still valid nonce for his own purposes.
CTF
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Uniswap V2 Book
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Compound Book
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Beigepaper
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EVM diff
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EVM storage
Dive deep into the storage of any contract
