Description

Ethereum Name Service (ENS) is a distributed, open, and extensible naming system based on the Ethereum blockchain. According to the documentation, controllers are allowed to register new domains and extend the expiry of existing domains, but they cannot change the ownership or reduce the expiration time of existing domains. However, a preliminary analysis suggests that an attacker-controlled controller may be able to reduce the expiration time of existing domains due to an integer overflow in the renew function. The vulnerability resides `@ensdomains/ens-contracts` prior to version 0.0.22. If successfully exploited, this vulnerability would enable attackers to force the expiration of any ENS record, ultimately allowing them to claim the affected domains for themselves. Currently, it would require a malicious DAO to exploit it. Nevertheless, any vulnerability present in the controllers could potentially render this issue exploitable in the future. An additional concern is the possibility of renewal discounts. Should ENS decide to implement a system that offers unlimited .eth domains for a fixed fee in the future, the vulnerability could become exploitable by any user due to the reduced attack cost. Version 0.0.22 contains a patch for this issue. As long as registration cost remains linear or superlinear based on registration duration, or limited to a reasonable maximum (eg, 1 million years), this vulnerability could only be exploited by a malicious DAO. The interim workaround is thus to take no action.

Severity

 

CVSS Version 4.0 CVSS Version 3.x CVSS Version 2.0

CVSS 4.0 Severity and Metrics:

NIST: NVD

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.

CVSS 3.x Severity and Metrics:

NIST: NVD

Base Score:  6.5 MEDIUM

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

CNA:  GitHub, Inc.

Base Score:  4.9 MEDIUM

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

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: It is possible that the NVD CVSS may not match that of the CNA. The most common reason for this is that publicly available information does not provide sufficient detail or that information simply was not available at the time the CVSS vector string was assigned.

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/ensdomains/ens-contracts/blob/master/contracts/ethregistrar/BaseRegistrarImplementation.sol#L171	Product
https://github.com/ensdomains/ens-contracts/commit/e6b136e979084de3761c125142620304173990ca	Patch
https://github.com/ensdomains/ens-contracts/security/advisories/GHSA-rrxv-q8m4-wch3	Exploit  Vendor Advisory

Weakness Enumeration

CWE-ID	CWE Name	Source
CWE-190	Integer Overflow or Wraparound	GitHub, Inc.

Known Affected Software Configurations Switch to CPE 2.2

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Change History

2 change records found show changes

CVE Modified by GitHub, Inc. 5/14/2024 9:22:13 AM

Action	Type	Old Value	New Value

Initial Analysis by NIST 8/10/2023 11:33:22 AM

Action	Type	Old Value	New Value
Added	CPE Configuration		OR *cpe:2.3:a:ens.domains:ethereum_name_service:*:*:*:*:*:*:*:* versions up to (excluding) 0.0.22
Added	CVSS V3.1		NIST AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N
Changed	Reference Type	https://github.com/ensdomains/ens-contracts/blob/master/contracts/ethregistrar/BaseRegistrarImplementation.sol#L171 No Types Assigned	https://github.com/ensdomains/ens-contracts/blob/master/contracts/ethregistrar/BaseRegistrarImplementation.sol#L171 Product
Changed	Reference Type	https://github.com/ensdomains/ens-contracts/commit/e6b136e979084de3761c125142620304173990ca No Types Assigned	https://github.com/ensdomains/ens-contracts/commit/e6b136e979084de3761c125142620304173990ca Patch
Changed	Reference Type	https://github.com/ensdomains/ens-contracts/security/advisories/GHSA-rrxv-q8m4-wch3 No Types Assigned	https://github.com/ensdomains/ens-contracts/security/advisories/GHSA-rrxv-q8m4-wch3 Exploit, Vendor Advisory