CVE-2023-34234: Governor proposal creation may be blocked by frontrunning in OpenZeppelin
First published: Wed Jun 07 2023(Updated: )
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.
Credit: security-advisories@github.com
| Affected Software | Affected Version | How to fix |
|---|---|---|
| npm/@openzeppelin/contracts-upgradeable | >=4.3.0<4.9.1 | 4.9.1 |
| npm/@openzeppelin/contracts | >=4.3.0<4.9.1 | 4.9.1 |
| OpenZeppelin Contracts | >=4.3.0<4.9.1 | |
| OpenZeppelin Contracts Upgradeable | >=4.3.0<4.9.1 |
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Reference Links
- https://github.com/OpenZeppelin/openzeppelin-contracts/commit/d9474327a492f9f310f31bc53f38dbea56ed9a57
- https://github.com/OpenZeppelin/openzeppelin-contracts/security/advisories/GHSA-5h3x-9wvq-w4m2
- https://nvd.nist.gov/vuln/detail/CVE-2023-34234
- https://github.com/OpenZeppelin/openzeppelin-contracts/releases/tag/v4.9.1
- https://github.com/OpenZeppelin/openzeppelin-contracts-upgradeable/commit/66f390fa516b550838e2c2f65132b5bc2afe1ced
- https://github.com/advisories/GHSA-5h3x-9wvq-w4m2 (Advisory)
Frequently Asked Questions
What is CVE-2023-34234?
CVE-2023-34234 is a vulnerability in the OpenZeppelin Contracts library that allows an attacker to frontrun the creation of a proposal and cancel it, potentially preventing the proposal from being proposed at all.
How does CVE-2023-34234 impact OpenZeppelin Contracts?
CVE-2023-34234 impacts OpenZeppelin Contracts by allowing an attacker to become the proposer of a proposal and gain the ability to cancel it repeatedly, potentially disrupting the proposal process.
What is the severity of CVE-2023-34234?
CVE-2023-34234 has a severity level of 5.3 (Medium).
Which software versions are affected by CVE-2023-34234?
OpenZeppelin Contracts versions 4.3.0 to 4.9.1 and OpenZeppelin Contracts Upgradeable versions 4.3.0 to 4.9.1 are affected by CVE-2023-34234.
How can I mitigate CVE-2023-34234?
To mitigate CVE-2023-34234, it is recommended to update to a version of OpenZeppelin Contracts or OpenZeppelin Contracts Upgradeable that is not affected by the vulnerability.
- collector/github-advisory-latest
- alias/GHSA-5h3x-9wvq-w4m2
- alias/CVE-2023-34234
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