CVE-2024-32481

published 2024-04-25

CVE-2024-32481: Vyper is a pythonic Smart Contract Language for the Ethereum virtual machine. Starting in version 0.3.8 and prior to version 0.4.0b1, when looping over a…

Priority P4 27 medium 5.3 CVSS 3.1

AV N AC L PR N UI N S U C N I L A N

Vyper is a pythonic Smart Contract Language for the Ethereum virtual machine. Starting in version 0.3.8 and prior to version 0.4.0b1, when looping over a `range` of the form `range(start, start + N)`, if `start` is negative, the execution will always revert. This issue is caused by an incorrect assertion inserted by the code generation of the range `stmt.parse_For_range()`. The issue arises when `start` is signed, instead of using `sle`, `le` is used and `start` is interpreted as an unsigned integer for the comparison. If it is a negative number, its 255th bit is set to `1` and is hence interpreted as a very large unsigned integer making the assertion always fail. Any contract having a `range(start, start + N)` where `start` is a signed integer with the possibility for `start` to be negative is affected. If a call goes through the loop while supplying a negative `start` the execution will revert. Version 0.4.0b1 fixes the issue.

Affected

5 ranges

Vendor	Product	Version range	Fixed in
vyperlang	vyper	—	—
vyperlang	vyper	—	—
vyperlang	vyper	>= 0.3.8 < 0.4.0	0.4.0
vyperlang	vyper	>= 0.3.8 < 0.4.0b1	0.4.0b1
vyperlang	vyper	0.3.8 – 0.3.10	—

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CWE-681