Tendermint is a high-performance blockchain consensus engine for Byzantine fault tolerant applications. Versions before 0.28.0 contain a potential attack via Improper Verification of Cryptographic Signature, affecting anyone using the tendermint-light-client and related packages to perform light client verification (e.g. IBC-rs, Hermes). The light client does not check that the chain IDs of the trusted and untrusted headers match, resulting in a possible attack vector where someone who finds a header from an untrusted chain that satisfies all other verification conditions (e.g. enough overlapping validator signatures) could fool a light client. The attack vector is currently theoretical, and no proof-of-concept exists yet to exploit it on live networks. This issue is patched in version 0.28.0. There are no workarounds.
| Vulnerable Product | Search on Vulmon | Subscribe to Product |
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tendermint-light-client-js project tendermint-light-client-js |
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tendermint-light-client project tendermint-light-client |
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tendermint-light-client-verifier project tendermint-light-client-verifier |
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