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CVE-2023-34234

MEDIUM
Published 2023-06-07T17:06:10.154Z
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Expert Analysis

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CVSS Score

V3.1
5.3
/10
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
Base Score Metrics
Exploitability: N/A Impact: N/A

EPSS Score

v2025.03.14
0.001
probability
of exploitation in the wild

There is a 0.1% chance that this vulnerability will be exploited in the wild within the next 30 days.

Updated: 2025-06-25
Exploit Probability
Percentile: 0.247
Higher than 24.7% of all CVEs

Attack Vector Metrics

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED

Impact Metrics

Confidentiality
NONE
Integrity
NONE
Availability
LOW

Description

OpenZeppelin Contracts is a library for smart contract development. By frontrunning the creation of a proposal, an attacker can become the proposer and gain the ability to cancel it. The attacker can do this repeatedly to try to prevent a proposal from being proposed at all. This impacts the `Governor` contract in v4.9.0 only, and the `GovernorCompatibilityBravo` contract since v4.3.0. This problem has been patched in 4.9.1 by introducing opt-in frontrunning protection. Users are advised to upgrade. Users unable to upgrade may submit the proposal creation transaction to an endpoint with frontrunning protection as a workaround.

Available Exploits

No exploits available for this CVE.

Related News

No news articles found for this CVE.

Affected Products

OpenZeppelin

openzeppelin-contracts

Affected Versions:

>=4.3.0, < 4.9.1

GitHub Security Advisories

Community-driven vulnerability intelligence from GitHub

✓ GitHub Reviewed MODERATE

OpenZeppelin Contracts's governor proposal creation may be blocked by frontrunning

GHSA-5h3x-9wvq-w4m2

Advisory Details

### Impact By frontrunning the creation of a proposal, an attacker can become the proposer and gain the ability to cancel it. The attacker can do this repeatedly to try to prevent a proposal from being proposed at all. This impacts the `Governor` contract in v4.9.0 only, and the `GovernorCompatibilityBravo` contract since v4.3.0. ### Patches The problem has been patched in 4.9.1 by introducing opt-in frontrunning protection. ### Workarounds Submit the proposal creation transaction to an endpoint with frontrunning protection. ### Credit Reported by Lior Abadi and Joaquin Pereyra from Coinspect. ### References https://www.coinspect.com/openzeppelin-governor-dos/

Affected Packages

npm @openzeppelin/contracts
ECOSYSTEM: ≥4.3.0 <4.9.1
npm @openzeppelin/contracts-upgradeable
ECOSYSTEM: ≥4.3.0 <4.9.1

CVSS Scoring

CVSS Score

5.0

CVSS Vector

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

References

WEB https://github.com/OpenZeppelin/openzeppelin-contracts/security/advisories/GHSA-5h3x-9wvq-w4m2
ADVISORY https://nvd.nist.gov/vuln/detail/CVE-2023-34234
WEB https://github.com/OpenZeppelin/openzeppelin-contracts-upgradeable/commit/66f390fa516b550838e2c2f65132b5bc2afe1ced
WEB https://github.com/OpenZeppelin/openzeppelin-contracts/commit/d9474327a492f9f310f31bc53f38dbea56ed9a57
PACKAGE https://github.com/OpenZeppelin/openzeppelin-contracts
WEB https://github.com/OpenZeppelin/openzeppelin-contracts/releases/tag/v4.9.1

Advisory provided by GitHub Security Advisory Database. Published: June 8, 2023, Modified: June 8, 2023

References

https://github.com/OpenZeppelin/openzeppelin-contracts/security/advisories/GHSA-5h3x-9wvq-w4m2
https://github.com/OpenZeppelin/openzeppelin-contracts/commit/d9474327a492f9f310f31bc53f38dbea56ed9a57
Published: 2023-06-07T17:06:10.154Z
Last Modified: 2025-02-06T16:55:49.744Z
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