CVE-2023-34234
OpenZeppelin Contracts's governor proposal creation may be blocked by frontrunning
Impact
### 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
| Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|
| npm | @openzeppelin/contracts | >= 4.3.0, < 4.9.1 | 4.9.1 |
| npm | @openzeppelin/contracts-upgradeable | >= 4.3.0, < 4.9.1 | 4.9.1 |
Affected products
| Vendor | Product | Affected versions |
|---|---|---|
| Openzeppelin | Contracts | from 4.3.0 before 4.9.1 |
| Openzeppelin | Contracts Upgradeable | from 4.3.0 before 4.9.1 |
Weakness classification
References
- NVD record
- CVE.org record
- GitHub advisory
- https://github.com/OpenZeppelin/openzeppelin-contracts/commit/d9474327a492f9f310f31bc53f38dbea56ed9a57
- https://github.com/OpenZeppelin/openzeppelin-contracts/security/advisories/GHSA-5h3x-9wvq-w4m2
- https://github.com/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