CVE-2022-21685: Integer underflow in Frontier

January 14, 2022

A bug in Frontier’s MODEXP precompile implementation can cause an integer underflow in certain conditions. This will cause a node crash for debug builds. For release builds (and production WebAssembly binaries), the impact is limited as it can only cause a normal EVM out-of-gas. It is recommended that you apply the patch as soon as possible.

If you do not use MODEXP precompile in your runtime, then you are not impacted.

References

github.com/advisories/GHSA-cjg2-2fjg-fph4
github.com/paritytech/frontier
github.com/paritytech/frontier/commit/8a93fdc6c9f4eb1d2f2a11b7ff1d12d70bf5a664
github.com/paritytech/frontier/pull/549
github.com/paritytech/frontier/security/advisories/GHSA-cjg2-2fjg-fph4
nvd.nist.gov/vuln/detail/CVE-2022-21685

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