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Set of common smart contracts
As it is stated here, if transaction
tvm.accept()
call),action phase
,+2
flag modifier,a validator may replay the transaction and drain the value stored on the contract.
Consider checking if the +2
modifier is applied to the message flag.
Why AbiHeader expire
is not helpful?
A transaction may be replayed several times in one block.
Why replay protection is not working?
The protection uses contract storage to prevent replay. Storage modifications are reverted if a transaction is reverted.
Why draining is possible?
Although a transaction reverts, the contract is charged for the execution as tvm.accept()
was called.
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