Ethermint is an Ethereum library. In Ethermint running versions before `v0.17.2`, the contract `selfdestruct` invocation permanently removes the corresponding bytecode from the internal database storage. However, due to a bug in the `DeleteAccount`function, all contracts that used the identical bytecode (i.e shared the same `CodeHash`) will also stop working once one contract invokes `selfdestruct`, even though the other contracts did not invoke the `selfdestruct` OPCODE. This vulnerability has been patched in Ethermint version v0.18.0. The patch has state machine-breaking changes for applications using Ethermint, so a coordinated upgrade procedure is required. A workaround is available. If a contract is subject to DoS due to this issue, the user can redeploy the same contract, i.e. with identical bytecode, so that the original contract's code is recovered. The new contract deployment restores the `bytecode hash -> bytecode` entry in the internal state.

Affected: Go: github.com/evmos/ethermint, Go: github.com/evmos/evmos, Go: github.com/crypto-org-chain/cronos, Go: github.com/Kava-Labs/kava

# Vulnerability Report

## Impact

Smart contract applications that make use of the `selfdestruct` functionality and their end-users.

## Classification

The vulnerability has been classified as `high` with a CVSS score of `8.2`. It has the potential to create a denial-of-service to all contracts that can invoke the [`selfdestruct`](https://ethereum.stackexchange.com/questions/315/why-are-selfdestructs-used-in-contract-programming#347) function to destroy a smart contract.

## Users Impacted

Due to the successfully coordinated security vulnerability disclosure, no smart contracts were impacted through the use of this vulnerability. Smart contract states and storage values are not affected by this vulnerability. User funds and balances are safe.

## Disclosure

In Ethermint running versions before `v0.17.2`, the contract `selfdestruct` invocation permanently removes the corresponding bytecode from the internal database storage. However, due to a bug in the [`DeleteAccount`](https://github.com/evmos/ethermint/blob/c9d42d667b753147977a725e98ed116c933c76cb/x/evm/keeper/statedb.go#L199-L203) function, all contracts that used the identical bytecode (i.e shared the same `CodeHash`) will also stop working once one contract invokes `selfdestruct`, even though the other contracts did not invoke the `selfdestruct` OPCODE.

### Additional Details

The same contract bytecode can be deployed multiple times to create multiple contract instances. In the internal database, the bytecode is…