Vulnerability in Input-Output-Hk Hydra
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.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:H/A:H.
EPSS exploit prediction
EPSS: 0.005 (41.5th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 42nd percentile — 41.5% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.004 · newest: 0.005 · change: +0.001
Affected products
- Input-Output-Hk Hydra — versions < 0.13.0
- Iohk Hydra
Weakness classification (CWE)
References
- github.com/input-output-hk/hydra/security/advisories/GHSA-gr36-mc6v-72qq (Vendor Advisory)
- github.com/input-output-hk/hydra/blob/ec6c7a2ab651462228475d0b34264e9a182c22bb/… (Product)
- github.com/input-output-hk/hydra/blob/ec6c7a2ab651462228475d0b34264e9a182c22bb/… (Product)
- github.com/input-output-hk/hydra/blob/ec6c7a2ab651462228475d0b34264e9a182c22bb/… (Product)
Frequently asked questions
- What is CVE-2023-42806?
- CVE-2023-42806 is a medium-severity vulnerability in Input-Output-Hk Hydra, classified under Improper Verification of Cryptographic Signature. CVSS score: 6.5/10. Published 2023-09-21.
- How severe is CVE-2023-42806?
- Medium severity. CVSS v3 base score is 6.5 out of 10.