Submitted by leastwood, also found by cccz
NFTMarketReserveAuction.sol#L263-L292
NFTMarketBuyPrice.sol#L125-L141
The adminAccountMigration() function is called by the operator role to update all sellers auctions. The auction.seller account is updated to the new address, however, the protocol fails to update buyPrice.seller. As a result, the protocol is put in a deadlock situation where the new address cannot cancel the auction and withdraw their NFT without the compromised account first cancelling the buy price and vice-versa. This is only recoverable if the new account is migrated back to the compromised account and then cancelBuyPrice() is called before migrating back.
Consider invalidating the buy offer before account migration.
NickCuso (Foundation) confirmed and commented:
