CVE-2022-31170: OpenZeppelin Contracts's ERC165Checker may revert instead of returning false
First published: Thu Jul 21 2022(Updated: )
OpenZeppelin Contracts is a library for smart contract development. Versions 4.0.0 until 4.7.1 are vulnerable to ERC165Checker reverting instead of returning `false`. `ERC165Checker.supportsInterface` is designed to always successfully return a boolean, and under no circumstance revert. However, an incorrect assumption about Solidity 0.8's `abi.decode` allows some cases to revert, given a target contract that doesn't implement EIP-165 as expected, specifically if it returns a value other than 0 or 1. The contracts that may be affected are those that use `ERC165Checker` to check for support for an interface and then handle the lack of support in a way other than reverting. The issue was patched in version 4.7.1.
Credit: security-advisories@github.com
| Affected Software | Affected Version | How to fix |
|---|---|---|
| OpenZeppelin Contracts | >=4.0.0<4.7.1 |
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Frequently Asked Questions
What is the vulnerability ID for this issue?
The vulnerability ID for this issue is CVE-2022-31170.
What is the severity level of CVE-2022-31170?
The severity level of CVE-2022-31170 is high with a CVSS score of 7.5.
Which software versions of OpenZeppelin Contracts are affected by CVE-2022-31170?
Versions 4.0.0 until 4.7.1 of OpenZeppelin Contracts are affected by CVE-2022-31170.
What is the impact of CVE-2022-31170?
CVE-2022-31170 can allow an attacker to cause a denial of service by causing the ERC165Checker to revert instead of returning `false`.
Is there a fix or patch available for CVE-2022-31170?
Yes, a patch has been released by OpenZeppelin. It is recommended to update to a version later than 4.7.1 of OpenZeppelin Contracts.
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