CVE-2023-28431

Frontier is an Ethereum compatibility layer for Substrate. Frontier's `modexp` precompile uses `num-bigint` crate under the hood. In the implementation prior to pull request 1017, the cases for modulus being even and modulus being odd are treated separately. Odd modulus uses the fast Montgomery multiplication, and even modulus uses the slow plain power algorithm. This gas cost discrepancy was not accounted for in the `modexp` precompile, leading to possible denial of service attacks. No fixes for `num-bigint` are currently available, and thus this issue is fixed in the short term by raising the gas costs for even modulus, and in the long term fixing it in `num-bigint` or switching to another modexp implementation. The short-term fix for Frontier is deployed at pull request 1017. There are no known workarounds aside from applying the fix.

CVSS v3 7.5 HIGH

7.5^/10

CVSS v3 : HIGH

Vector :

Exploitability : 3.9 / Impact : 3.6

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required NONE

User Interaction NONE

Confidentiality Impact NONE

Integrity Impact NONE

Availability Impact HIGH

Scope UNCHANGED

References

Link	Resource
https://github.com/paritytech/frontier/commit/5af12e94d7dfc8a0208a290643a800f55de7b219	Patch
https://github.com/paritytech/frontier/pull/1017	Patch
https://github.com/paritytech/frontier/security/advisories/GHSA-fcmm-54jp-7vf6	Vendor Advisory
https://github.com/rust-num/num-bigint/blob/6f2b8e0fc218dbd0f49bebb8db2d1a771fe6bafa/src/biguint/power.rs#L134	Product

Configurations

Configuration 1 (hide)

cpe:2.3:a:parity:frontier:*:*:*:*:*:*:*:*

History

No history.

Information

Published : 2023-03-22 21:15

Updated : 2023-11-07 04:10

NVD link : CVE-2023-28431

Mitre link : CVE-2023-28431

CVE.ORG link : CVE-2023-28431

JSON object : View

Products Affected

parity

frontier

CWE

CWE-682

Incorrect Calculation

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