CVE-2023-30541: TransparentUpgradeableProxy clashing selector calls may not be delegated in @openzeppelin/contracts
Impact
A function in the implementation contract may be inaccessible if its selector clashes with one of the proxy's own selectors. Specifically, if the clashing function has a different signature with incompatible ABI encoding, the proxy could revert while attempting to decode the arguments from calldata.
The probability of an accidental clash is negligible, but one could be caused deliberately.
Patches
The issue has been fixed in v4.8.3.
Workarounds
If a function appears to be inaccessible for this reason, it may be possible to craft the calldata such that ABI decoding does not fail at the proxy and the function is properly proxied through.
References
https://github.com/OpenZeppelin/openzeppelin-contracts/pull/4154
Other sources
OpenZeppelin Contracts is a library for secure smart contract development. A function in the implementation contract may be inaccessible if its selector clashes with one of the proxy's own selectors. Specifically, if the clashing function has a different signature with incompatible ABI encoding, the proxy could revert while attempting to decode the arguments from calldata. The probability of an accidental clash is negligible, but one could be caused deliberately and could cause a reduction in availability. The issue has been fixed in version 4.8.3. As a workaround if a function appears to be inaccessible for this reason, it may be possible to craft the calldata such that ABI decoding does not fail at the proxy and the function is properly proxied through.
Affected Software
Remediation
Event History
Frequently Asked Questions
What is the vulnerability ID?
The vulnerability ID is CVE-2023-30541.
What is OpenZeppelin Contracts?
OpenZeppelin Contracts is a library for secure smart contract development.
What is the severity of CVE-2023-30541?
The severity of CVE-2023-30541 is medium.
How does CVE-2023-30541 affect OpenZeppelin Contracts?
CVE-2023-30541 affects OpenZeppelin Contracts versions 3.2.0 to 4.8.3.
How can I fix CVE-2023-30541?
You can fix CVE-2023-30541 by updating to OpenZeppelin Contracts version 4.8.3 or later.