VYPR
Low severityNVD Advisory· Published Feb 2, 2024· Updated Aug 1, 2024

Vyper external calls can overflow return data to return input buffer

CVE-2024-24560

Description

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.

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Affected packages

Versions sourced from the GitHub Security Advisory.

PackageAffected versionsPatched versions
vyperPyPI
< 0.4.00.4.0

Affected products

2

Patches

Vulnerability mechanics

References

4

News mentions

0

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