A custom stateful precompile can use the is_static parameter to determine if the call is executed in a static context (via STATICCALL), and thus decide if stateful operations should be done. Previously, the passed is_static parameter was incorrect -- it was only set to true if the call comes from a direct STATICCALL opcode. However, once a static call context is entered, it should stay static.
The issue only impacts custom precompiles that actually uses is_static. The maintainers estimate the usage is low. However, for those affected, it can lead to possible incorrect state transitions.
PR: https://github.com/rust-blockchain/evm/pull/133 Released in v0.36.0.
Older patch versions can be released on request if anyone needs them. Simply contact @sorpaas by email to request it.
If you have any questions or comments about this advisory: * Open an issue in evm repo * Email Wei at wei@that.world
{
"nvd_published_at": "2022-10-25T19:15:00Z",
"cwe_ids": [
"CWE-670"
],
"severity": "MODERATE",
"github_reviewed_at": "2022-10-25T22:27:21Z",
"github_reviewed": true
}