Vulnerability Details CVE-2023-42806
Hydra is the layer-two scalability solution for Cardano. Prior to version 0.13.0, not signing and verifying `$\mathsf{cid}$` allows an attacker (which must be a participant of this head) to use a snapshot from an old head instance with the same participants to close the head or contest the state with it. This can lead to an incorrect distribution of value (= value extraction attack; hard, but possible) or prevent the head to finalize because the value available is not consistent with the closed utxo state (= denial of service; easy). A patch is planned for version 0.13.0. As a workaround, rotate keys between heads so not to re-use keys and not result in the same multi-signature participants.
Exploit prediction scoring system (EPSS) score
EPSS Score 0.001
EPSS Ranking 21.1%
CVSS Severity
CVSS v3 Score 6.5
References
- https://github.com/input-output-hk/hydra/blob/ec6c7a2ab651462228475d0b34264e9a182c22bb/hydra-node/src/Hydra/HeadLogic.hs#L357
- https://github.com/input-output-hk/hydra/blob/ec6c7a2ab651462228475d0b34264e9a182c22bb/hydra-node/src/Hydra/Snapshot.hs#L50-L54
- https://github.com/input-output-hk/hydra/blob/ec6c7a2ab651462228475d0b34264e9a182c22bb/hydra-plutus/src/Hydra/Contract/Head.hs#L583-L599
- https://github.com/input-output-hk/hydra/security/advisories/GHSA-gr36-mc6v-72qq
- https://github.com/input-output-hk/hydra/blob/ec6c7a2ab651462228475d0b34264e9a182c22bb/hydra-node/src/Hydra/HeadLogic.hs#L357
- https://github.com/input-output-hk/hydra/blob/ec6c7a2ab651462228475d0b34264e9a182c22bb/hydra-node/src/Hydra/Snapshot.hs#L50-L54
- https://github.com/input-output-hk/hydra/blob/ec6c7a2ab651462228475d0b34264e9a182c22bb/hydra-plutus/src/Hydra/Contract/Head.hs#L583-L599
- https://github.com/input-output-hk/hydra/security/advisories/GHSA-gr36-mc6v-72qq
Products affected by CVE-2023-42806
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cpe:2.3:a:iohk:hydra:-
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cpe:2.3:a:iohk:hydra:0.1.0
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cpe:2.3:a:iohk:hydra:0.10.0
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cpe:2.3:a:iohk:hydra:0.11.0
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cpe:2.3:a:iohk:hydra:0.12.0
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cpe:2.3:a:iohk:hydra:0.2.0
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cpe:2.3:a:iohk:hydra:0.3.0
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cpe:2.3:a:iohk:hydra:0.4.0
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cpe:2.3:a:iohk:hydra:0.5.0
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cpe:2.3:a:iohk:hydra:0.6.0
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cpe:2.3:a:iohk:hydra:0.7.0
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cpe:2.3:a:iohk:hydra:0.8.0
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cpe:2.3:a:iohk:hydra:0.8.1
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cpe:2.3:a:iohk:hydra:0.9.0