Submission Details
Severity:
Cross-chain replay attacks are possible with `L1BossBridge#sendToL1()`
Summary
Mistakes made on one chain can be re-applied to the correct layer 2 chain.
Vulnerability Details
There is no chain.id in the signed data.
Impact
If a user does a sendToL1() using the wrong network, an attacker can replay the action on the correct chain and steal the tokens from users.
Tools Used
Manual review.
Recommendations
Include the chain.id in what's hashed.
Rewards breakdown
nSLOC
99This contest has a flat reward structure with the following payouts:
100 EXP
20 EXP
2 EXP
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