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In blockchains, mempool controls transaction flow before consensus, denial ofwhose service hurts the health and security of blockchain networks. This paperpresents MPFUZZ, the first mempool fuzzer to find asymmetric DoS bugs bysymbolically exploring mempool state space and optimistically estimating thepromisingness an intermediate state is in reaching bug oracles. Compared to thebaseline blockchain fuzzers, MPFUZZ achieves a > 100x speedup in finding knownDETER exploits. Running MPFUZZ on six major Ethereum clients leads to thediscovering of new mempool vulnerabilities, which exhibit a wide variety ofsophisticated patterns including stealthy mempool eviction and mempool locking.Rule-based mitigation schemes are proposed against newly discoveredvulnerabilities.

Understanding Ethereum Mempool Security under Asymmetric DoS by Symbolic Fuzzing