CVE-2023-42448 | BDVDB-2026-213313 Detail
input-output-hkhydra
Description#
Hydra is the layer-two scalability solution for Cardano. Prior to version 0.13.0, the specification states that the contestation period in the datum of the UTxO at the head validator must stay unchanged as the state progresses from Open to Closed (Close transaction), but no such check appears to be performed in the `checkClose` function of the head validator. This would allow a malicious participant to modify the contestation deadline of the head to either allow them to fanout the head without giving another participant the chance to contest, or prevent any participant from ever redistributing the funds locked in the head via a fan-out. Version 0.13.0 contains a patch for this issue.
Impact#
Per CVSS v3.1: confidentiality impact none, integrity impact high, availability impact high. Attack vector: network.
Weaknesses#
- CWE-20 Improper Input Validation
References#
- https://github.com/input-output-hk/hydra/security/advisories/GHSA-mgcx-6p7h-5996
- https://github.com/input-output-hk/hydra/commit/2f45529729e28254a62f7a7c8d6649066923ed1f
- https://github.com/input-output-hk/hydra/blob/master/CHANGELOG.md#0130---2023-10-03
- https://github.com/input-output-hk/hydra/blob/master/hydra-plutus/src/Hydra/Contract/Head.hs#L284-L296
- https://github.com/input-output-hk/hydra/blob/master/hydra-plutus/src/Hydra/Contract/Head.hs#L320-L323
Exploit#
No public exploit known
History#
- Version 1Record published in the CVE List.
- Version 2Most recent update recorded in the CVE List.