In order for interchain transfers to be processed, there is a need to check the amount being received/sent against the flow limit, for e.g., consider giveToken() that gets called whenever there is a need to process an interchain transfer.
https://github.com/code-423n4/2024-08-axelar-network/blob/69c4f2c3fcefb1b8eb2129af9c3685a44ae5b6fe/interchain-token-service/contracts/TokenHandler.sol#L45-L79
Now this function adds in the flown amount before finalizing the transfer, now when adding the inflown amount, there is a check that reverts when the limit is passed.
This then allows a whale to always DOS the channel and block off deposits for the whole duration, cause immediately the epoch starts, they pass in a payload to transfer flowlimit cross chain and once this gets processed all subsequent transfers would fail cause the flowlimit has been reached.
Reoccurring DOS for interchain transfers, and this could be repeated at relatively low cost, since all the attacker pays is the minute gas fees to pass in the request.
Consider having a max limit for a particular sender/receiver whenever the flow limit is set, this could be like 10% of the flowlimit set.
