CVE - CVE-2023-28431

CVE-ID
CVE-2023-28431	Learn more at National Vulnerability Database (NVD) • CVSS Severity Rating • Fix Information • Vulnerable Software Versions • SCAP Mappings • CPE Information
Description
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.
References
Note: References are provided for the convenience of the reader to help distinguish between vulnerabilities. The list is not intended to be complete.
MISC:https://github.com/paritytech/frontier/commit/5af12e94d7dfc8a0208a290643a800f55de7b219 URL:https://github.com/paritytech/frontier/commit/5af12e94d7dfc8a0208a290643a800f55de7b219 MISC:https://github.com/paritytech/frontier/pull/1017 URL:https://github.com/paritytech/frontier/pull/1017 MISC:https://github.com/paritytech/frontier/security/advisories/GHSA-fcmm-54jp-7vf6 URL:https://github.com/paritytech/frontier/security/advisories/GHSA-fcmm-54jp-7vf6 MISC:https://github.com/rust-num/num-bigint/blob/6f2b8e0fc218dbd0f49bebb8db2d1a771fe6bafa/src/biguint/power.rs#L134 URL:https://github.com/rust-num/num-bigint/blob/6f2b8e0fc218dbd0f49bebb8db2d1a771fe6bafa/src/biguint/power.rs#L134
Assigning CNA
GitHub (maintainer security advisories)
Date Record Created
20230315	Disclaimer: The record creation date may reflect when the CVE ID was allocated or reserved, and does not necessarily indicate when this vulnerability was discovered, shared with the affected vendor, publicly disclosed, or updated in CVE.
Phase (Legacy)
Assigned (20230315)
Votes (Legacy)

Comments (Legacy)

Proposed (Legacy)
N/A
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