CVE-2022-21685

Summary

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.

Affected Software

Weaknesses

• CWE-191: CWE-191: Integer Underflow (Wrap or Wraparound)

ADP Enrichment

CVE Program Container

Additional References

• https://github.com/paritytech/frontier/security/advisories/GHSA-cjg2-2fjg-fph4
• https://github.com/paritytech/frontier/pull/549
• https://github.com/paritytech/frontier/commit/8a93fdc6c9f4eb1d2f2a11b7ff1d12d70bf5a664

CISA ADP Vulnrichment

• SSVC:
• Exploitation: none
  • Automatable: no
  • Technical Impact: partial

References

• https://github.com/paritytech/frontier/security/advisories/GHSA-cjg2-2fjg-fph4
• https://github.com/paritytech/frontier/pull/549
• https://github.com/paritytech/frontier/commit/8a93fdc6c9f4eb1d2f2a11b7ff1d12d70bf5a664

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