Vyper is a Pythonic Smart Contract Language for the Ethereum Virtual Machine. When calls to external contracts are made, we write the input buffer starting at byte 28, and allocate the return buffer to start at byte 0 (overlapping with the input buffer). When checking RETURNDATASIZE for dynamic types, the size is compared only to the minimum allowed size for that type, and not to the returned value's length. As a result, malformed return data can cause the contract to mistake data from the input buffer for returndata. When the called contract returns invalid ABIv2 encoded data, the calling contract can read different invalid data (from the dirty buffer) than the called contract returned.
Advisories
Source ID Title
EUVD EUVD EUVD-2024-0175 Vyper is a Pythonic Smart Contract Language for the Ethereum Virtual Machine. When calls to external contracts are made, we write the input buffer starting at byte 28, and allocate the return buffer to start at byte 0 (overlapping with the input buffer). When checking RETURNDATASIZE for dynamic types, the size is compared only to the minimum allowed size for that type, and not to the returned value's length. As a result, malformed return data can cause the contract to mistake data from the input buffer for returndata. When the called contract returns invalid ABIv2 encoded data, the calling contract can read different invalid data (from the dirty buffer) than the called contract returned.
Github GHSA Github GHSA GHSA-gp3w-2v2m-p686 Vyper's external calls can overflow return data to return input buffer
Fixes

Solution

No solution given by the vendor.


Workaround

No workaround given by the vendor.

History

No history.

cve-icon MITRE

Status: PUBLISHED

Assigner: GitHub_M

Published:

Updated: 2024-08-01T23:19:52.915Z

Reserved: 2024-01-25T15:09:40.208Z

Link: CVE-2024-24560

cve-icon Vulnrichment

Updated: 2024-08-01T23:19:52.915Z

cve-icon NVD

Status : Modified

Published: 2024-02-02T17:15:11.720

Modified: 2024-11-21T08:59:25.313

Link: CVE-2024-24560

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

No data.