CVE-2021-25835: Authentication Bypass by Capture-replay

February 15, 2022 (updated April 12, 2022)

Cosmos Network Ethermint <= v0.4.0 is affected by a cross-chain transaction replay vulnerability in the EVM module. Since ethermint uses the same chainIDEpoch and signature schemes with ethereum for compatibility, a verified signature in ethereum is still valid in ethermint with the same msg content and chainIDEpoch, which enables “cross-chain transaction replay” attack.

References

github.com/advisories/GHSA-x5f3-qmwj-4f84
github.com/cosmos/ethermint/issues/687
github.com/cosmos/ethermint/pull/692
github.com/cosmos/ethermint/releases/tag/v0.4.1
nvd.nist.gov/vuln/detail/CVE-2021-25835

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