Submitted by 0x52, also found by csanuragjain
SponsorVault.sol#L234-L263
Sponsor vaults drained.
reimburseRelayerFees uses SponsorVault funds to repay users the fees they pay to relayers. A malicious relayer could create a large number of transactions with the max reimbursed relay fee specified in SponsorVault between chains for which they relay all of them. They would receive back the relay fee from the SponsorVault and they would also get the relay fee they paid themselves.
I dont see any way to mitigate this without substantial changes to the functionality of SponsorVault. Teams deploying SponsorVaults should be informed of potential misuse and set reimburse limits accordingly.
LayneHaber (Connext) disputed and commented:
LayneHaber (Connext) resolved:
0xleastwood (judge) decreased severity to Medium and commented:
