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cnvd-2022-06893

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Frontier is Substrate's Ethereum compatibility layer. Prior to commit number `8a93fdc6c9f4eb1d2f2a11b7ff1d12d70bf5a664`, 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. Users who do not use MODEXP precompile in their runtime are not impacted. A patch is available in pull request #549.

GHSA-cjg2-2fjg-fph4 — Integer underflow in Frontier

Affected: crates.io: pallet-evm-precompile-modexp

### Impact

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.

### Patches

Patches are applied in PR #549.

### Workarounds

None.

### References

Patch PR: #549

### Credits

Thanks to SR-Labs for discovering the security vulnerability, and thanks to PureStake team for the patches.

### For more information

If you have any questions or comments about this advisory: * Open an issue in the [Frontier repo](https://github.com/paritytech/frontier)

Most recent entries from all

cnvd-2022-06893

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GHSA-cjg2-2fjg-fph4 — Integer underflow in Frontier

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