Impact
SignatureChecker.isValidSignatureNow is not expected to 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-1271 as expected.
The contracts that may be affected are those that use SignatureChecker to check the validity of a signature and handle invalid signatures in a way other than reverting. We believe this to be unlikely.
Patches
The issue was patched in 4.7.1.
References
#3552
For more information
If you have any questions or comments about this advisory, or need assistance deploying the fix, email us at [email protected].
Impact
SignatureChecker.isValidSignatureNowis not expected to revert. However, an incorrect assumption about Solidity 0.8'sabi.decodeallows some cases to revert, given a target contract that doesn't implement EIP-1271 as expected.The contracts that may be affected are those that use
SignatureCheckerto check the validity of a signature and handle invalid signatures in a way other than reverting. We believe this to be unlikely.Patches
The issue was patched in 4.7.1.
References
#3552
For more information
If you have any questions or comments about this advisory, or need assistance deploying the fix, email us at [email protected].