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 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.
| Software | From | Fixed in |
|---|---|---|
vyper
|
0.3.8 | 0.4.0 |
| vyperlang / vyper | 0.3.8 | 0.3.10.x |
| vyperlang / vyper | 0.4.0 | 0.4.0.x |
- https://github.com/vyperlang/vyper/blob/9136169468f317a53b4e7448389aa315f90b95ba/vyper/codegen/stmt.py#L286-L287
- https://github.com/vyperlang/vyper/commit/3de1415ee77a9244eb04bdb695e249d3ec9ed868
- https://github.com/vyperlang/vyper/commit/5319cfbe14951e007ccdb323257e5ada869b35d5
- https://github.com/vyperlang/vyper/security/advisories/GHSA-ppx5-q359-pvwj
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