CVE-2021-39167
TimelockController vulnerability in OpenZeppelin Contracts
描述
### Impact A vulnerability in `TimelockController` allowed an actor with the executor role to take immediate control of the timelock, by resetting the delay to 0 and escalating privileges, thus gaining unrestricted access to assets held in the contract. Instances with the executor role set to "open" allow anyone to use the executor role, thus leaving the timelock at risk of being taken over by an attacker. ### Patches A fix is included in the following releases of `@openzeppelin/contracts` and `@openzeppelin/contracts-upgradeable`: - 4.3.1 - 3.4.2 - 3.4.2-solc-0.7 Deployed instances of `TimelockController` should be replaced with a fixed version by migrating all assets, ownership, and roles. ### Workarounds Revoke the executor role from accounts not strictly under the team's control. We recommend revoking all executors that are not also proposers. When applying this mitigation, ensure there is at least one proposer and executor remaining. ### References [Post-mortem](https://forum.openzeppelin.com/t/timelockcontroller-vulnerability-postmortem/14958). ### Credits The issue was identified by an anonymous white hat hacker through [Immunefi](https://immunefi.com/). ### For more information If you have any questions or comments about this advisory, or need assistance executing the mitigation, email us at security@openzeppelin.com.
如何修補 CVE-2021-39167
要修補 CVE-2021-39167,請將受影響套件升級到下列已修補版本。
- —升級至 4.3.1 或更新版本
CVE-2021-39167 正在被利用嗎?
低 — EPSS 為 1.6%,目前沒有觀察到大規模利用活動。
受影響套件(1)
- >= 4.0.0, < 4.3.1