Description

Hydra is the layer-two scalability solution for Cardano. Users of the Hydra head protocol send the UTxOs they wish to commit into the Hydra head first to the `commit` validator, where they remain until they are either collected into the `head` validator or the protocol initialisation is aborted and the value in the committed UTxOs is returned to the users who committed them. Prior to version 0.12.0, the `commit` validator contains a flawed check when the `ViaAbort` redeemer is used, which allows any user to spend any UTxO which is at the validator arbitrarily, meaning an attacker can steal the funds that users are trying to commit into the head validator. The intended behavior is that the funds must be returned to the user which committed the funds and can only be performed by a participant of the head. The `initial` validator also is similarly affected as the same flawed check is performed for the `ViaAbort` redeemer. Due to this issue, an attacker can steal any funds that user's try to commit into a Hydra head. Also, an attacker can prevent any Hydra head from being successfully opened. It does not allow an attacker to take funds which have been successfully collected into and currently reside in the `head` validator. Version 0.12.0 contains a fix for this issue.

Severity

 

CVSS Version 3.x CVSS Version 2.0

CVSS 3.x Severity and Metrics:

CNA:  GitHub, Inc.

Base Score:  9.1 CRITICAL

Vector:  CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H

NVD Analysts use publicly available information to associate vector strings and CVSS scores. We also display any CVSS information provided within the CVE List from the CNA.

Note: The NVD and the CNA have provided the same score. When this occurs only the CNA information is displayed, but the Acceptance Level icon for the CNA is given a checkmark to signify NVD concurrence.

CVSS 2.0 Severity and Metrics:

NIST: NVD

Base Score: N/A

NVD assessment not yet provided.

NVD Analysts use publicly available information to associate vector strings and CVSS scores. We also display any CVSS information provided within the CVE List from the CNA.

Note: NVD Analysts have not published a CVSS score for this CVE at this time. NVD Analysts use publicly available information at the time of analysis to associate CVSS vector strings.

References to Advisories, Solutions, and Tools

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Hyperlink	Resource
https://github.com/input-output-hk/hydra/blob/master/CHANGELOG.md#0120---2023-08-18	Release Notes
https://github.com/input-output-hk/hydra/blob/master/hydra-plutus/src/Hydra/Contract/Commit.hs#L94-L97	Product
https://github.com/input-output-hk/hydra/blob/master/hydra-plutus/src/Hydra/Contract/Util.hs#L32-L42	Product
https://github.com/input-output-hk/hydra/security/advisories/GHSA-6x9v-7x5r-w8w6	Exploit  Third Party Advisory

Weakness Enumeration

CWE-ID	CWE Name	Source
NVD-CWE-noinfo	Insufficient Information	NIST
CWE-20	Improper Input Validation	GitHub, Inc.

Known Affected Software Configurations Switch to CPE 2.2

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Change History

1 change records found show changes

Initial Analysis by NIST 10/11/2023 3:34:24 PM

Action	Type	Old Value	New Value
Added	CPE Configuration		OR *cpe:2.3:a:iohk:hydra:*:*:*:*:*:*:*:* versions up to (excluding) 0.12.0
Added	CVSS V3.1		NIST AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H
Added	CWE		NIST NVD-CWE-noinfo
Changed	Reference Type	https://github.com/input-output-hk/hydra/blob/master/CHANGELOG.md#0120---2023-08-18 No Types Assigned	https://github.com/input-output-hk/hydra/blob/master/CHANGELOG.md#0120---2023-08-18 Release Notes
Changed	Reference Type	https://github.com/input-output-hk/hydra/blob/master/hydra-plutus/src/Hydra/Contract/Commit.hs#L94-L97 No Types Assigned	https://github.com/input-output-hk/hydra/blob/master/hydra-plutus/src/Hydra/Contract/Commit.hs#L94-L97 Product
Changed	Reference Type	https://github.com/input-output-hk/hydra/blob/master/hydra-plutus/src/Hydra/Contract/Util.hs#L32-L42 No Types Assigned	https://github.com/input-output-hk/hydra/blob/master/hydra-plutus/src/Hydra/Contract/Util.hs#L32-L42 Product
Changed	Reference Type	https://github.com/input-output-hk/hydra/security/advisories/GHSA-6x9v-7x5r-w8w6 No Types Assigned	https://github.com/input-output-hk/hydra/security/advisories/GHSA-6x9v-7x5r-w8w6 Exploit, Third Party Advisory