Vulnerability CVE-2022-21685


Published: 2022-01-14

Description:
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.

Type:

CWE-191

(Integer Underflow (Wrap or Wraparound))

CVSS2 => (AV:N/AC:L/Au:S/C:N/I:N/A:P)

CVSS Base Score
Impact Subscore
Exploitability Subscore
4/10
2.9/10
8/10
Exploit range
Attack complexity
Authentication
Remote
Low
Single time
Confidentiality impact
Integrity impact
Availability impact
None
None
Partial
Affected software
Parity -> Frontier 

 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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